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Product Warranties - Activity Related to Product Warranty Liability (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Product Warranty Liability [Line Items]    
Reserve balance at the beginning of the year $ 16.0 $ 13.0
Provision for warranties issued 14.4 14.5
Settlements made (in cash or in kind) (14.3) (13.5)
Acquisitions   1.6
Reserve balance at end of year $ 16.1 $ 15.6