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Commitments and Contingencies (Details 2) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Changes in the accrued product quality issue  
Total accrued product quality issue as of December 31, 2011 $ 7.5
Estimated expense for expected product quality claims 1.7
Product quality claims (2.1)
Total accrued product quality issue as of September 30, 2012 $ 7.1