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Income Taxes - Summary of Effective Tax Rate (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Provision computed at U.S. federal statutory rate		$ 132.9	$ 192.6	$ 203.8
Federal tax reform				(2.0)
State and local taxes, net of federal benefit		28.4	35.7	36.9
Goodwill impairment	[1]	11.6
Other		(1.2)	(7.7)	(6.2)
Total provision for taxes		$ 171.7	$ 220.6	$ 232.5
[1] For additional information regarding the impairment of goodwill within our Paper reporting unit, see Note 8, Goodwill and Intangible Assets.

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