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Product Warranties - Activity Related to Product Warranty Liability (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Product Warranty Liability [Line Items]    
Reserve balance at the beginning of the year $ 17.2 $ 16.2
Provision for warranties issued 6.2 8.2
Settlements made (in cash or in kind) (6.2) (8.5)
Reserve balance at end of year $ 17.2 $ 15.9