Income Taxes - Provision For Income Taxes From Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal U.S.	$ 8.2	$ 20.0	$ 34.9
Non-U.S.	20.1	41.3	26.0
State and local	(0.3)	5.5	7.8
Deferred:
Federal U.S.	(13.6)	0.2	4.9
Non-U.S.	(73.5)	(9.2)	(4.3)
State and local	(4.3)	0.1	1.1
Income tax provision	$ (63.4)	$ 57.9	$ 70.4