| **Variable Interest Entities Variable Interest Entities - Table 1 (Details) - USD ($) $ in Millions**                                                                                                                                                                                                                                                                                  | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014 |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|---------------|
| **Variable Interest Entity [Line Items]**                                                                                                                                                                                                                                                                                                                                              |          |               |          |          |   |
| Cash and cash equivalents                                                                                                                                                                                                                                                                                                                                                              | $ 70.3        |               | $ 61.6        | $ 45.5        | $ 66.7 |
| Accounts receivable, net                                                                                                                                                                                                                                                                                                                                                               | 420.6         |               | 410.5         |          |   |
| Other current assets                                                                                                                                                                                                                                                                                                                                                                   | 168.6         |               | 126.6         |          |   |
| Total current assets                                                                                                                                                                                                                                                                                                                                                                   | 659.5         |               | 598.7         |          |   |
| Property and equipment, net                                                                                                                                                                                                                                                                                                                                                            | 1,336.9       |               | 1,310.1       |          |   |
| Goodwill                                                                                                                                                                                                                                                                                                                                                                               | 1,899.7       |               | 1,890.1       |          |   |
| Intangible assets, net                                                                                                                                                                                                                                                                                                                                                                 | 414.2         |               | 419.4         |          |   |
| Other long-term assets                                                                                                                                                                                                                                                                                                                                                                 | 206.8         |               | 197.0         |          |   |
| Total assets                                                                                                                                                                                                                                                                                                                                                                           | 4,632.6       | [1]           | 4,606.1       |          |   |
| Current portion of long-term debt                                                                                                                                                                                                                                                                                                                                                      | 36.5          |               | 36.8          |          |   |
| Accounts payable                                                                                                                                                                                                                                                                                                                                                                       | 67.1          |               | 61.6          |          |   |
| Accrued expenses and other current liabilities                                                                                                                                                                                                                                                                                                                                         | 355.5         |               | 328.0         |          |   |
| Total current liabilities                                                                                                                                                                                                                                                                                                                                                              | 459.1         |               | 426.4         |          |   |
| Long-term debt, net of current portion                                                                                                                                                                                                                                                                                                                                                 | 3,050.0       |               | 3,134.7       |          |   |
| Total Liabilities                                                                                                                                                                                                                                                                                                                                                                      | 3,663.2       |               | $ 3,705.7     |          |   |
| Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]                                                                                                                                                                                                                                                                                                          |          |               |          |          |   |
| **Variable Interest Entity [Line Items]**                                                                                                                                                                                                                                                                                                                                              |          |               |          |          |   |
| Cash and cash equivalents                                                                                                                                                                                                                                                                                                                                                              | 1.5           |               |          |          |   |
| Accounts receivable, net                                                                                                                                                                                                                                                                                                                                                               | 31.4          |               |          |          |   |
| Other current assets                                                                                                                                                                                                                                                                                                                                                                   | 6.7           |               |          |          |   |
| Total current assets                                                                                                                                                                                                                                                                                                                                                                   | 39.6          |               |          |          |   |
| Property and equipment, net                                                                                                                                                                                                                                                                                                                                                            | 132.6         |               |          |          |   |
| Goodwill                                                                                                                                                                                                                                                                                                                                                                               | 73.5          |               |          |          |   |
| Intangible assets, net                                                                                                                                                                                                                                                                                                                                                                 | 8.6           |               |          |          |   |
| Other long-term assets                                                                                                                                                                                                                                                                                                                                                                 | 1.0           |               |          |          |   |
| Total assets                                                                                                                                                                                                                                                                                                                                                                           | 255.3         |               |          |          |   |
| Current portion of long-term debt                                                                                                                                                                                                                                                                                                                                                      | 1.4           |               |          |          |   |
| Accounts payable                                                                                                                                                                                                                                                                                                                                                                       | 8.5           |               |          |          |   |
| Accrued expenses and other current liabilities                                                                                                                                                                                                                                                                                                                                         | 14.1          |               |          |          |   |
| Total current liabilities                                                                                                                                                                                                                                                                                                                                                              | 24.0          |               |          |          |   |
| Long-term debt, net of current portion                                                                                                                                                                                                                                                                                                                                                 | 30.6          |               |          |          |   |
| Total Liabilities                                                                                                                                                                                                                                                                                                                                                                      | $ 54.6        |               |          |          |   |
|                                                                                                                                                                                                                                                                                                                                                                                        |
| [1](1) Our consolidated assets as of June 30, 2016 include total assets of variable interest entities of $255.3 million, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of June 30, 2016 include total liabilities of the variable interest entities of $54.6 million. See Note 3, Variable Interest Entities. |

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Carrying value as of the balance sheet date 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. 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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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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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 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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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.
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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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Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).
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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).
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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes 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 and of liabilities not separately disclosed.
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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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