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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.