Income Taxes, (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current [Abstract]
U.S. federal	$ 25.6	$ 64.0	$ (6.6)
U.S. state and local	1.5	3.0	1.3
Non-U.S.	47.8	49.8	57.8
Deferred [Abstract]
U.S. federal	14.4	(217.5)	(61.4)
U.S. state and local	(0.7)	0.0	(3.4)
Non-U.S.	(8.5)	(30.5)	(19.6)
Provision (benefit) for income taxes	$ 80.1	$ (131.2)	$ (31.9)