Income Taxes - Summary of Effective Tax Rate (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Provision computed at U.S. federal statutory rate	[1]	$ 203.8	$ 290.0	$ 241.0
Federal tax reform		(2.0)	(127.2)
State and local taxes, net of federal benefit		36.9	24.0	19.8
Domestic manufacturers deduction	[2]		(21.1)	(21.1)
Other		(6.2)	(5.7)	(0.8)
Total provision for taxes		$ 232.5	$ 160.0	$ 238.9

[1] U.S. federal statutory rate of 21% in 2018 and 35% in 2017 and 2016.

[2] The domestic manufacturers deduction was eliminated after 2017 as a result of the Tax Cuts and Jobs Act.