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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Statutory federal income tax rate, amount | $ 176.5 | $ 231.1 | $ 235.5
State taxes, net of federal effect, amount | 31.1 | 18.3 | 17.7
Equity based compensation, amount | (19.7) | (36.2) | (1.6)
Effect of rates different than statutory, amount | 0.6 | (6.3) | (4.6)
Foreign withholding tax, amount | 2.8 | 1.0 | 0.8
Effect of U.K. tax rate change on deferred taxes, amount | 0.0 | 0.0 | (1.5)
Effect of US Tax Cuts and Jobs Act on Deferred Taxes, amount | (1.9) | (75.5) | 0.0
Other, amount | 8.1 | 5.2 | 1.8
Income tax expense | $ 197.5 | $ 137.6 | $ 248.1
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Statutory federal income tax rate, percent | 21.00% | 35.00% | 35.00%
State taxes, net of federal effect, percent | 3.70% | 2.80% | 2.60%
Equity based compensation, percent | (2.30%) | (5.50%) | (0.20%)
Effect of rates different than statutory, percent | 0.10% | (1.00%) | (0.70%)
Foreign withholding tax, percent | 0.30% | 0.10% | 0.10%
Effect of U.K. tax rate change on deferred taxes, percent | 0.00% | 0.00% | (0.20%)
Effect of US Tax Cuts and Jobs Act on Deferred Taxes, percent | (0.20%) | (11.40%) | 0.00%
Other, percent | 0.90% | 0.80% | 0.30%
Income tax expense, rate | 23.50% | 20.80% | 36.90%

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