Income Taxes - Current and Deferred Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal U.S.	$ 122.9	$ 80.2	$ 71.2
Non-U.S.	19.8	19.5	25.5
State and local	18.4	16.8	19.3
Deferred:
Federal U.S.	(33.3)	13.2	8.9
Non-U.S.	(8.4)	(1.1)	(3.7)
State and local	(1.1)	0.7	0.6
Income tax provision	$ 118.3	$ 129.3	$ 121.8