Warranties (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Changes in the accruals for warranties
Beginning balance	$ 17.1	$ 13.5	$ 14.7	$ 12.5
Warranty costs incurred	(1.7)	(1.6)	(3.8)	(4.6)
Warranty originations and revisions	4.3	3.9	10.9	9.9
Warranty expirations	(0.7)	(1.0)	(2.8)	(3.0)
Ending balance	$ 19.0	$ 14.8	$ 19.0	$ 14.8