Accumulated Other Comprehensive Income (Loss) (Components of accumulated comprehensive loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ (14.0)
Balance	(30.0)	$ (14.0)
Cumulative Translation Adjustment
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(5.1)	2.8	$ 5.4
Foreign currency translation adjustments	(11.8)	(7.9)	(2.6)
Recognition of actuarial gain	0.0	0.0	0.0
Tax adjustment	0.0	0.0	0.0
Pension and OPEB activity, net of taxes	0.0	0.0	0.0
Balance	(16.9)	(5.1)	2.8
Pension and Postretirement Benefits
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(8.9)	0.6	(12.2)
Foreign currency translation adjustments	0.0	0.0	0.0
Recognition of actuarial gain	(6.7)	(14.9)	19.9
Tax adjustment	2.5	5.4	(7.1)
Pension and OPEB activity, net of taxes	(4.2)	(9.5)	12.8
Balance	(13.1)	(8.9)	0.6
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(14.0)	3.4	(6.8)
Foreign currency translation adjustments	(11.8)	(7.9)	(2.6)
Recognition of actuarial gain	(6.7)	(14.9)	19.9
Tax adjustment	2.5	5.4	(7.1)
Pension and OPEB activity, net of taxes	(4.2)	(9.5)	12.8
Balance	$ (30.0)	$ (14.0)	$ 3.4