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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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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