Income Taxes - Summary of Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Provision computed at U.S. federal statutory rate of 35%	$ 290.0	$ 241.0	$ 232.6
Federal tax reform	(127.2)
State and local taxes, net of federal benefit	24.0	19.8	20.0
Domestic manufacturers deduction	(21.1)	(21.1)	(19.9)
Other	(5.7)	(0.8)	(5.0)
Total provision (benefit) for taxes	$ 160.0	$ 238.9	$ 227.7