Warranties (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in the accruals for warranties
Beginning balance	$ 12.5	$ 13.5	$ 13.2
Warranty costs incurred	(5.9)	(5.9)	(6.3)
Warranty originations and revisions	11.9	7.7	9.1
Warranty expirations	(3.8)	(2.8)	(2.5)
Ending balance	$ 14.7	$ 12.5	$ 13.5