| **Consolidated Statements of Cash Flows - USD ($) $ in Millions**                             | 12 Months Ended |
|-----------------------------------------------------------------------------------------------|-----------------|
||
| **Cash flows from operating activities:**                                                     |            |   |   |
| Net income                                                                                    | $ 365.9         | $ 517.2 | $ 368.8 |
| Income from discontinued operations, net of tax                                               | (15.2)          | (114.1) | (90.6) |
| **Adjustments to reconcile net income to net cash provided by operating activities—**   |            |   |   |
| Provision for government, class action, and related settlements                               | 0.0             | 0.0 | 2.8 |
| Depreciation and amortization                                                                 | 243.6           | 219.6 | 203.0 |
| Amortization of debt-related items                                                            | 9.7             | 7.8 | 7.2 |
| Loss on early extinguishment of debt                                                          | 1.4             | 1.0 | 2.3 |
| Equity in net income of nonconsolidated affiliates                                            | (2.9)           | (3.4) | (2.9) |
| Distributions from nonconsolidated affiliates                                                 | 4.0             | 2.6 | 3.4 |
| Stock-based compensation                                                                      | 29.2            | 29.1 | 25.6 |
| Deferred tax expense                                                                          | 27.9            | 17.4 | 34.5 |
| Other, net                                                                                    | 20.3            | (2.6) | 6.8 |
| **Changes in assets and liabilities, net of acquisitions —**                            |            |   |   |
| Accounts receivable                                                                           | (16.9)          | (39.5) | (5.1) |
| Prepaid expenses and other assets                                                             | 8.0             | (41.8) | (1.2) |
| Accounts payable                                                                              | 2.3             | 15.6 | 14.1 |
| Accrued payroll                                                                               | (31.2)          | (30.4) | 79.2 |
| Accrued interest payable                                                                      | (1.7)           | (2.6) | 14.7 |
| Other liabilities                                                                             | 9.1             | (11.2) | 6.3 |
| Net cash provided by operating activities of discontinued operations                          | 52.3            | 151.1 | 35.8 |
| Total adjustments                                                                             | 355.1           | 312.7 | 426.5 |
| Net cash provided by operating activities                                                     | 705.8           | 715.8 | 704.7 |
| **Cash flows from investing activities:**                                                     |            |   |   |
| Acquisition of businesses, net of cash acquired                                               | 0.0             | (1.1) | 0.0 |
| Purchases of property and equipment                                                           | (564.8)         | (524.6) | (392.8) |
| Additions to capitalized software costs                                                       | (9.2)           | (14.6) | (8.3) |
| Purchases of intangible assets                                                                | (10.1)          | (6.5) | (3.5) |
| Proceeds from sale of restricted investments                                                  | 0.0             | 0.0 | 12.6 |
| Purchases of restricted investments                                                           | (35.2)          | (9.0) | (8.7) |
| Other, net                                                                                    | (4.2)           | 8.7 | (3.8) |
| Net cash used in investing activities of discontinued operations                              | (3.5)           | (119.2) | (3.0) |
| Net cash used in investing activities                                                         | (627.0)         | (666.3) | (407.5) |
| **Cash flows from financing activities:**                                                     |            |   |   |
| Proceeds from bond issuance                                                                   | 0.0             | 0.0 | 992.5 |
| Principal payments on debt, including pre-payments                                            | (345.8)         | (214.5) | (717.2) |
| Principal borrowings on notes                                                                 | 11.8            | 0.0 | 0.0 |
| Borrowings on revolving credit facility                                                       | 240.0           | 300.0 | 330.0 |
| Payments on revolving credit facility                                                         | (385.0)         | (100.0) | (375.0) |
| Principal payments under finance lease obligations                                            | (19.2)          | (44.6) | (14.4) |
| Debt amendment and issuance costs                                                             | (24.1)          | 0.0 | (20.3) |
| Repurchases of common stock, including fees and expenses                                      | 0.0             | 0.0 | (6.1) |
| Dividends paid on common stock                                                                | (99.0)          | (112.2) | (111.8) |
| Purchase of equity interests in consolidated affiliates                                       | 0.0             | 0.0 | (162.3) |
| Distributions paid to noncontrolling interests of consolidated affiliates                     | (96.6)          | (101.1) | (70.9) |
| Taxes paid on behalf of employees for shares withheld                                         | (7.3)           | (14.6) | (14.7) |
| Contributions from noncontrolling interests of consolidated affiliates                        | 64.1            | 57.2 | 34.9 |
| Other, net                                                                                    | 0.3             | (0.1) | 1.0 |
| Net cash provided by (used in) financing activities of discontinued operations                | 515.1           | (10.2) | (11.6) |
| Net cash used in financing activities                                                         | (145.7)         | (240.1) | (145.9) |
| (Decrease) increase in cash, cash equivalents, and restricted cash                            | (66.9)          | (190.6) | 151.3 |
| Cash, cash equivalents, and restricted cash at beginning of year                              | 120.3           | 310.9 | 159.6 |
| Cash, cash equivalents, and restricted cash at end of year                                    | 53.4            | 120.3 | 310.9 |
| **Reconciliation of Cash, Cash Equivalents, and Restricted Cash**                             |            |   |   |
| Cash and cash equivalents at beginning of period                                              | 49.4            | 185.6 | 60.0 |
| Restricted cash at beginning of period                                                        | 62.5            | 63.9 | 57.4 |
| Restricted cash included in other long-term assets at beginning of period                     | 0.4             | 21.5 | 7.4 |
| Cash, cash equivalents, and restricted cash in discontinued operations at beginning of period | 8.0             | 39.9 | 34.8 |
| Cash, cash equivalents, and restricted cash at beginning of year                              | 120.3           | 310.9 | 159.6 |
| Cash and cash equivalents at end of period                                                    | 21.8            | 49.4 | 185.6 |
| Restricted cash at end of period                                                              | 31.6            | 62.5 | 63.9 |
| Restricted cash included in other long-term assets at end of period                           | 0.0             | 0.4 | 21.5 |
| Cash, cash equivalents, and restricted cash in discontinued operations at end of period       | 0.0             | 8.0 | 39.9 |
| Cash, cash equivalents, and restricted cash at end of year                                    | 53.4            | 120.3 | 310.9 |
| **Supplemental cash flow information:**                                                       |            |   |   |
| Interest                                                                                      | (178.4)         | (168.4) | (168.4) |
| Income tax refunds                                                                            | 1.0             | 1.8 | 1.4 |
| Income tax payments                                                                           | $ (51.2)        | $ (131.4) | $ (34.3) |

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The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method.
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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.
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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; attributable to disposal group, including, but not limited to, discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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Amount of cash inflow (outflow) of financing activities of discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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Amount of cash inflow (outflow) of operating activities of discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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| - Definition
Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.
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| - Definition
Amount of cash outflow for principal payment on finance lease.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (loss) for proportionate share of equity method investee's income (loss).
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| - Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.
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| - Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.
+ References
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| - Definition
The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.
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| - Definition
The increase (decrease) during the period in accrued salaries.
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| - Definition
The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.
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| - References
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| - Definition
Amount of increase (decrease) in operating liabilities classified as other.
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| - Definition
Amount of increase (decrease) in prepaid expenses, and assets classified as other.
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| - Definition
Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.
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| - Definition
Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.
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No definition available.
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| - Definition
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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| - Definition
Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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| - References
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| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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| - References
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| - Definition
Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.
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| - Definition
Amount of cash (inflow) outflow from investing activities classified as other.
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| - Definition
The cash outflow to reacquire common stock during the period.
+ References
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| - Definition
The cash outflow associated with the development, modification or acquisition of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.
+ References
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| - Definition
The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.
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| - Definition
The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.
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| - Definition
Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.
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| - Definition
Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.
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| - Definition
The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.
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| - Definition
The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.
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| - Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
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| - Definition
The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions.
+ References
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| - Definition
Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.
+ References
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| - Definition
The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.
+ References
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| - Definition
The amount of cash received during the period as refunds for the overpayment of taxes.
+ References
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| - Definition
The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).
+ References
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| - Definition
The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.
+ References
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| - Definition
The cash inflow from a borrowing supported by a written promise to pay an obligation.
+ References
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| - Definition
Amount of cash inflow (outflow) from financing activities classified as other.
+ References
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| - Definition
The cash inflow associated with the sale of investments that are pledged or subject to withdrawal restrictions during the period.
+ References
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.
+ References
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| - Definition
The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.
+ References
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| - Definition
Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.
+ References
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| - Definition
Amount of noncash expense for share-based payment arrangement.
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| - References
No definition available.
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