Income Taxes - Summary of Components of Company's Income Tax Provision (Benefit) from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current
U.S. federal	$ 55.0	$ 4.8	$ 45.2
State and local	14.3	(0.1)	11.5
Current income tax provision (benefit)	69.3	4.7	56.7
Deferred
U.S. federal	(17.3)	26.1	(8.1)
State and local	(0.7)	11.7	2.3
Deferred income tax provision (benefit)	(18.0)	37.8	(5.8)
Income tax provision	$ 51.3	$ 42.5	$ 50.9