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5. Product Warranty Liability (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]  
Accrual at beginning of period $ 16.4
Provision for warranty 3.8
Actual warranty costs (4.7)
Accrual at end of period $ 15.5