Accrued Warranty Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in product warranty liability [Roll Forward]
Balance at beginning of period	$ 7.1	$ 6.1
Claims paid	(1.0)	(0.6)
Warranty expense, net	1.0	0.7
Balance at end of period	$ 7.1	$ 6.2