Commitments and Contingencies (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Changes in the accrued product quality issue
Total accrued product quality issue, beginning balance	$ 7.5	$ 16.0
Changes in estimates associated with pre-existing liabilities		(2.8)
Estimated expense for expected product quality claims	2.2
Product quality claims	(3.0)	(5.7)
Total accrued product quality issue, ending balance	$ 6.7	$ 7.5