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Product Warranties - Activity Related to Product Warranty Liability (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Product Warranty Liability [Line Items]    
Reserve balance at the beginning of the year $ 16.0 $ 13.0
Provision for warranties issued 23.8 21.6
Settlements made (in cash or in kind) (22.8) (20.3)
Acquisitions 0.4 1.5
Reserve balance at end of year $ 17.4 $ 15.8