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5. Product Warranty Liability (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]  
Accrual at beginning of period $ 17.8us-gaap_ProductWarrantyAccrual
Provision for warranty 8.3us-gaap_ProductWarrantyAccrualWarrantiesIssued
Actual warranty costs (10.4)us-gaap_ProductWarrantyAccrualPayments
Accrual at end of period $ 15.7us-gaap_ProductWarrantyAccrual