Income Taxes - Current and Deferred Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal U.S.	$ 38.9	$ 48.3	$ 170.0
Non-U.S.	84.6	96.3	69.8
State and local	11.7	7.8	10.5
Deferred:
Federal U.S.	43.0	27.3	(62.0)
Non-U.S.	(21.1)	(19.6)	(1.7)
State and local	(8.0)	0.0	2.7
Income tax provision	$ 149.1	$ 160.1	$ 189.3