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Activity Related to Product Warranty Liability (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Product Warranty Liability [Line Items]    
Reserve balance at January 1, $ 15.2 $ 14.3
Provision for warranties issued 5.2 3.9
Settlements made (in cash or in kind) (5.3) (4.2)
Reserve balance at March 31, $ 15.1 $ 14.0