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Variable Interest Entities - Carrying Amounts and Classification of Consolidated VIEs (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 54.4 | $ 40.5 | $ 61.6 | $ 66.7
Restricted cash |  | 62.4 | 60.9 |  |
Accounts receivable, net of allowance for doubtful accounts |  | 459.5 | 432.0 |  |
Total current assets |  | 702.2 | 654.5 |  |
Property and equipment, net |  | 1,517.1 | 1,391.8 |  |
Goodwill |  | 1,972.6 | 1,927.2 | $ 1,890.1 | $ 1,084.0
Intangible assets, net |  | 403.1 | 411.3 |  |
Other long-term assets |  | 235.1 | 221.3 |  |
Total assets | [1] | 4,893.7 | 4,681.9 |  |
Current portion of long-term debt |  | 32.3 | 37.1 |  |
Accounts payable |  | 78.4 | 68.3 |  |
Accrued interest payable |  | 24.7 | 25.8 |  |
Other current liabilities |  | 210.0 | 197.1 |  |
Total current liabilities |  | 517.5 | 475.6 |  |
Long-term debt, net of current portion |  | 2,545.4 | 2,979.3 |  |
Total liabilities |  | 3,248.2 | 3,614.9 |  |
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 1.2 | 1.6 |  |
Restricted cash |  | 3.5 | 3.8 |  |
Accounts receivable, net of allowance for doubtful accounts |  | 32.6 | 30.8 |  |
Other current assets |  | 2.1 | 2.0 |  |
Total current assets |  | 39.4 | 38.2 |  |
Property and equipment, net |  | 142.8 | 140.0 |  |
Goodwill |  | 73.5 | 73.5 |  |
Intangible assets, net |  | 7.7 | 9.6 |  |
Deferred income tax assets |  | 0.7 | 0.6 |  |
Other long-term assets |  | 0.0 | 0.4 |  |
Total assets |  | 264.1 | 262.3 |  |
Current portion of long-term debt |  | 1.8 | 1.5 |  |
Accounts payable |  | 6.5 | 6.8 |  |
Accrued payroll |  | 7.1 | 6.6 |  |
Accrued interest payable |  | 0.2 | 0.2 |  |
Other current liabilities |  | 8.6 | 5.4 |  |
Total current liabilities |  | 24.2 | 20.5 |  |
Long-term debt, net of current portion |  | 28.3 | 29.8 |  |
Total liabilities |  | $ 52.5 | $ 50.3 |  |
[1] | Our consolidated assets as of December 31, 2017 and December 31, 2016 include total assets of variable interest entities of $264.1 million and $262.3 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of December 31, 2017 and December 31, 2016 include total liabilities of the variable interest entities of $52.5 million and $50.3 million, respectively. See Note 3, Variable Interest Entities.

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