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5. Product Warranty Liability (Details)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Accrual at beginning of period $ 17.8
Provision for warranty 15.5
Actual warranty costs (16.4)
Accrual at end of period $ 16.9