Accrued Warranty Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Changes in product warranty liability
Balance at beginning of period	$ 5.4	$ 6.9
Claims paid during the period	(0.8)	(1.1)
Warranty expense	0.5	1.4
Balance at end of period	$ 5.1	$ 7.2