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Product Warranties - Activity Related to Product Warranty Liability (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Product Warranties Disclosures [Abstract]    
Reserve balance at the beginning of the year $ 13.0 $ 10.3
Provision for warranties issued 21.6 17.0
Settlements made (in cash or in kind) (20.3) (16.3)
Acquisitions 1.5  
Reserve balance at end of year $ 15.8 $ 11.0