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5. Product Warranty Liability (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]  
Accrual at beginning of period $ 16.4
Provision for warranty 3.9
Actual warranty costs (4.9)
Accrual at end of period $ 15.4