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Commitments - Activity Related to Product Warranty Liability (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Product Warranty Liability [Line Items]      
Reserve balance at the beginning of the year $ 16.2 $ 16.0 $ 13.0
Provision for warranties issued 25.1 25.8 29.9
Settlements made (in cash or in kind) (24.3) (25.5) (28.3)
Acquisition   0.3 1.6
Foreign currency 0.2 (0.4) (0.2)
Reserve balance at end of year $ 17.2 $ 16.2 $ 16.0