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Product Warranties - Activity Related to Product Warranty Liability (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Product Warranty Liability [Line Items]    
Reserve balance at the beginning of the year $ 16.2 $ 16.0
Provision for warranties issued 13.1 14.4
Settlements made (in cash or in kind) (13.3) (14.3)
Reserve balance at end of year $ 16.0 $ 16.1