| **Variable Interest Entities - Carrying Amounts and Classification of Consolidated VIEs (Details) - USD ($) $ in Millions**                                                                                                                                                                                                                                                                | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|---------------|
| **Variable Interest Entity [Line Items]**                                                                                                                                                                                                                                                                                                                                                  |               |          |          |          |   |
| Cash and cash equivalents                                                                                                                                                                                                                                                                                                                                                                  |               | $ 40.5        | $ 61.6        | $ 66.7        | $ 64.5 |
| Restricted cash                                                                                                                                                                                                                                                                                                                                                                            |               | 60.9          | 45.9          |          |   |
| Accounts receivable, net of allowance for doubtful accounts                                                                                                                                                                                                                                                                                                                                |               | 432.0         | 403.3         |          |   |
| Total current assets                                                                                                                                                                                                                                                                                                                                                                       |               | 654.5         | 598.7         |          |   |
| Property and equipment, net                                                                                                                                                                                                                                                                                                                                                                |               | 1,391.8       | 1,310.1       |          |   |
| Goodwill                                                                                                                                                                                                                                                                                                                                                                                   |               | 1,927.2       | 1,890.1       | $ 1,084.0     | $ 456.9 |
| Intangible assets, net                                                                                                                                                                                                                                                                                                                                                                     |               | 411.3         | 419.4         |          |   |
| Other long-term assets                                                                                                                                                                                                                                                                                                                                                                     |               | 221.3         | 197.0         |          |   |
| Total assets                                                                                                                                                                                                                                                                                                                                                                               | [1]           | 4,681.9       | 4,606.1       |          |   |
| Current portion of long-term debt                                                                                                                                                                                                                                                                                                                                                          |               | 37.1          | 36.8          |          |   |
| Accounts payable                                                                                                                                                                                                                                                                                                                                                                           |               | 68.3          | 61.6          |          |   |
| Accrued interest payable                                                                                                                                                                                                                                                                                                                                                                   |               | 25.8          | 29.7          |          |   |
| Other current liabilities                                                                                                                                                                                                                                                                                                                                                                  |               | 197.1         | 172.1         |          |   |
| Total current liabilities                                                                                                                                                                                                                                                                                                                                                                  |               | 475.6         | 426.4         |          |   |
| Long-term debt, net of current portion                                                                                                                                                                                                                                                                                                                                                     |               | 2,979.3       | 3,134.7       |          |   |
| Total liabilities                                                                                                                                                                                                                                                                                                                                                                          |               | 3,614.9       | $ 3,705.7     |          |   |
| Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]                                                                                                                                                                                                                                                                                                              |               |          |          |          |   |
| **Variable Interest Entity [Line Items]**                                                                                                                                                                                                                                                                                                                                                  |               |          |          |          |   |
| Cash and cash equivalents                                                                                                                                                                                                                                                                                                                                                                  |               | 1.6           |          |          |   |
| Restricted cash                                                                                                                                                                                                                                                                                                                                                                            |               | 3.8           |          |          |   |
| Accounts receivable, net of allowance for doubtful accounts                                                                                                                                                                                                                                                                                                                                |               | 30.8          |          |          |   |
| Other current assets                                                                                                                                                                                                                                                                                                                                                                       |               | 2.0           |          |          |   |
| Total current assets                                                                                                                                                                                                                                                                                                                                                                       |               | 38.2          |          |          |   |
| Property and equipment, net                                                                                                                                                                                                                                                                                                                                                                |               | 140.0         |          |          |   |
| Goodwill                                                                                                                                                                                                                                                                                                                                                                                   |               | 73.5          |          |          |   |
| Intangible assets, net                                                                                                                                                                                                                                                                                                                                                                     |               | 9.6           |          |          |   |
| Deferred income tax assets                                                                                                                                                                                                                                                                                                                                                                 |               | 0.6           |          |          |   |
| Other long-term assets                                                                                                                                                                                                                                                                                                                                                                     |               | 0.4           |          |          |   |
| Total assets                                                                                                                                                                                                                                                                                                                                                                               |               | 262.3         |          |          |   |
| Current portion of long-term debt                                                                                                                                                                                                                                                                                                                                                          |               | 1.5           |          |          |   |
| Accounts payable                                                                                                                                                                                                                                                                                                                                                                           |               | 6.8           |          |          |   |
| Accrued payroll                                                                                                                                                                                                                                                                                                                                                                            |               | 6.6           |          |          |   |
| Accrued interest payable                                                                                                                                                                                                                                                                                                                                                                   |               | 0.2           |          |          |   |
| Other current liabilities                                                                                                                                                                                                                                                                                                                                                                  |               | 5.4           |          |          |   |
| Total current liabilities                                                                                                                                                                                                                                                                                                                                                                  |               | 20.5          |          |          |   |
| Long-term debt, net of current portion                                                                                                                                                                                                                                                                                                                                                     |               | 29.8          |          |          |   |
| Total liabilities                                                                                                                                                                                                                                                                                                                                                                          |               | $ 50.3        |          |          |   |
|                                                                                                                                                                                                                                                                                                                                                                                            |
| [1]Our consolidated assets as of December 31, 2016 include total assets of variable interest entities of $262.3 million, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of December 31, 2016 include total liabilities of the variable interest entities of $50.3 million. See Note 3, Variable Interest Entities. |

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.
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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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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, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting and classified as noncurrent.
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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.
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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.
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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.
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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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