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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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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%

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