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Product Warranties - Activity Related to Product Warranty Liability (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Product Warranties Disclosures [Abstract]    
Reserve balance at the beginning of the year $ 13.0 $ 10.3
Provision for warranties issued 14.5 11.2
Settlements made (in cash or in kind) (13.5) (10.5)
Acquisitions 1.6  
Reserve balance at end of year $ 15.6 $ 11.0