Income Taxes (Provision) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ (1.7)	$ (0.8)	$ (23.6)
State	(0.7)	(1.6)	3.7
Foreign	5.9	7.1	4.0
Current income tax provision (benefit)	3.5	4.7	(15.9)
Deferred:
Federal	0.0	(8.7)	0.0
State	0.0	(3.0)	0.0
Foreign	(0.4)	1.9	(0.2)
Deferred income tax benefit	(0.4)	(9.8)	(0.2)
Income tax provision (benefit)	3.1	(5.1)	(16.1)
Domestic	3.9	(33.2)	(106.2)
Foreign	20.7	28.8	22.4
Income (Loss) before income taxes	$ 24.6	$ (4.4)	$ (83.8)