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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Statutory federal income tax rate, amount $ 231.1 $ 235.4 $ 226.4
State taxes, net of federal effect, amount 18.3 17.8 16.5
Equity based compensation, amount (36.2) (1.6) 0.0
Effect of rates different than statutory, amount (6.3) (4.5) (1.9)
Foreign withholding tax, amount 1.0 0.8 3.3
Effect of U.K. tax rate change on deferred taxes, amount 0.0 (1.5) (4.0)
Effect of US Tax Cuts and Jobs Act on Deferred Taxes, amount (75.5) 0.0 0.0
Other, amount 4.9 1.6 3.6
Income tax expense $ 137.3 $ 248.0 $ 243.9
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Statutory federal income tax rate, percent 35.00% 35.00% 35.00%
State taxes, net of federal effect, percent 2.80% 2.60% 2.60%
Equity based compensation, percent (5.50%) (0.20%) 0.00%
Effect of rates different than statutory, percent (1.00%) (0.70%) (0.30%)
Foreign withholding tax, percent 0.20% 0.10% 0.50%
Effect of U.K. tax rate change on deferred taxes, percent 0.00% (0.20%) (0.60%)
Effect of US Tax Cuts and Jobs Act on Deferred Taxes, percent (11.40%) 0.00% 0.00%
Other, percent 0.70% 0.30% 0.50%
Income tax expense, rate 20.80% 36.90% 37.70%