Warranties (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes in the accruals for warranties
Beginning balance	$ 13.5	$ 13.8	$ 12.5	$ 13.5
Warranty costs incurred	(1.6)	(1.1)	(4.6)	(5.0)
Warranty originations and revisions	3.9	2.6	9.9	7.8
Warranty expirations	(1.0)	(0.6)	(3.0)	(1.6)
Ending balance	$ 14.8	$ 14.7	$ 14.8	$ 14.7