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Product Warranties - Activity Related to Product Warranty Liability (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Product Warranties Disclosures [Abstract]    
Reserve balance at the beginning of the year $ 13.0us-gaap_ProductWarrantyAccrual $ 10.3us-gaap_ProductWarrantyAccrual
Provision for warranties issued 7.1us-gaap_ProductWarrantyAccrualWarrantiesIssued 4.9us-gaap_ProductWarrantyAccrualWarrantiesIssued
Settlements made (in cash or in kind) (6.6)us-gaap_ProductWarrantyAccrualPayments (4.9)us-gaap_ProductWarrantyAccrualPayments
Reserve balance at end of year $ 13.5us-gaap_ProductWarrantyAccrual $ 10.3us-gaap_ProductWarrantyAccrual