Warranties (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Changes in the accruals for warranties
Beginning balance	$ 15.2	$ 12.6	$ 14.7	$ 12.5
Warranty costs incurred	(1.3)	(1.5)	(2.1)	(3.0)
Warranty originations and revisions	4.3	3.4	6.6	6.0
Warranty expirations	(1.1)	(1.0)	(2.1)	(2.0)
Ending balance	$ 17.1	$ 13.5	$ 17.1	$ 13.5