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Long-Term Debt - Composition of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt $ 3,153.6 $ 2,432.3
Less unamortized original issue discounts on long-term debt (13.5) (13.2)
Current deferred revenue (25.7) (23.9)
Less current portion of long-term debt (24.3) (18.4)
Long-term debt, net of current portion 3,090.1 2,376.8
Secured Debt | 2024 Term Loans    
Debt Instrument [Line Items]    
Long-term debt $ 1,807.4 $ 1,832.3
Effective interest rate 2.80% 4.70%
Secured Debt | 2027 Term Loans    
Debt Instrument [Line Items]    
Long-term debt $ 746.2 $ 0.0
Effective interest rate 3.00%  
Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt $ 600.0 600.0
Effective interest rate 5.40%  
Line of Credit | Revolver | Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt $ 0.0 $ 0.0