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Long-Term Debt - Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]          
Carrying value $ 3,259.9   $ 3,259.9   $ 3,255.9
Net loss on extinguishments of long-term debt 0.0 $ 0.0 0.0 $ (57.4)  
Deferred finance costs, net 19.6   19.6   20.4
Senior notes due 2023          
Debt Instrument [Line Items]          
Carrying value $ 525.0   $ 525.0   $ 525.0
Interest Rate 5.00%   5.00%   5.00%
Deferred finance costs, net $ 4.0   $ 4.0   $ 4.5
Senior notes due 2024          
Debt Instrument [Line Items]          
Carrying value $ 575.0   $ 575.0   $ 575.0
Interest Rate 5.50%   5.50%   5.50%
Deferred finance costs, net $ 4.8   $ 4.8   $ 5.2
Senior notes due 2025          
Debt Instrument [Line Items]          
Carrying value $ 600.0   $ 600.0   $ 600.0
Interest Rate 5.00%   5.00%   5.00%
Deferred finance costs, net $ 6.8   $ 6.8   $ 7.3
Senior notes due 2022          
Debt Instrument [Line Items]          
Carrying value   600.0   600.0  
Net loss on extinguishments of long-term debt   (43.0)      
Redemption premium   37.0      
Deferred finance costs, net and unamortized premium   $ (6.0)   $ (6.0)