Other Operating Credits and Charges, Net (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Operating Credits And Charges, Net [Abstract]
Standard and Extended Product Warranty Accrual, Period Increase (Decrease)	$ 0.0	$ 2.0	$ 3.4	$ 0.0		$ 5.4	$ 10.9
Other operating credits and charges, net	$ (0.9)			$ 0.0	$ 11.4	$ 4.5	$ 11.4