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Company's Warranty Liability Activity (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Product Warranties    
Balance at beginning of year $ 140.9 $ 139.3
Expense 39.7 42.5
Claims settled (38.2) (40.9)
Balance at end of year $ 142.4 $ 140.9