Accrued Warranty Costs (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Changes in product warranty liability [Roll Forward]
Balance at beginning of period	$ 7.1	$ 6.1
Claims paid	(1.6)	(1.0)
Warranty expense, net	2.1	0.8
Balance at end of period	$ 7.6	$ 5.9