Income Taxes - Provision/(Benefit) For Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
U.S. federal	$ (67.2)	$ (2.0)	$ 0.3
Foreign	54.0	38.2	61.5
State and local	(10.6)	(0.6)	0.0
Total current	(23.8)	35.6	61.8
Deferred
U.S. federal	3.6	(38.3)	(2.6)
Foreign	(50.2)	(11.1)	(9.4)
State and local	2.8	0.1	(2.4)
Total deferred	(43.8)	(49.3)	(14.4)
Income tax (benefit) expense	$ (67.6)	$ (13.7)	$ 47.4