Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Changes in the accrued product quality issue
Total accrued product quality issue as of December31, 2011	$ 7.5
Product quality claims	(1.2)
Total accrued product quality issue as of March31, 2012	$ 6.3