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Product Warranties - Activity Related to Product Warranty Liability (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Product Warranty Liability [Line Items]    
Reserve balance at the beginning of the year $ 17.2 $ 16.2
Provision for warranties issued 12.6 13.1
Settlements made (in cash or in kind) (12.8) (13.3)
Reserve balance at end of year $ 17.0 $ 16.0