Income Taxes, (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current [Abstract]
U.S. federal	$ 64.0	$ (6.6)	$ 0.0
U.S. state and local	3.0	1.3	1.6
Non-U.S.	49.8	57.8	46.7
Deferred [Abstract]
U.S. federal	(217.5)	(61.4)	(31.5)
U.S. state and local	0.0	(3.4)	(9.3)
Non-U.S.	(30.5)	(19.6)	(22.2)
Benefit for income taxes	$ (131.2)	$ (31.9)	$ (14.7)