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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate, at federal statutory income tax rate, percent |  |  | 21.00% |  | 35.00%
Maximum measurement period to finalize accounting of tax |  |  | 1 year |  |
Income tax provision | $ 67.4 | $ 77.8 | $ 172.6 | $ 204.9 |
Effective income tax rate, percent | 24.60% | 35.90% | 24.40% | 33.90% |
Tax cuts and jobs act of 2017, reduction in federal tax rate, percent | 14.00% |  | 14.00% |  |
Effective income tax rate, offset by domestic production activities, percent | 3.20% |  | 3.20% |  |
Effective income tax rate, federal benefit of state tax deductions, percent | 0.80% |  | 0.80% |  |
Cash paid for taxes, net of refunds received |  |  | $ 73.2 | $ 208.3 |

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