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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.