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Activity Related to Product Warranty Liability (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Product Warranty Liability [Line Items]    
Reserve balance at January 1, $ 10.4 $ 9.5
Provision for warranties issued 17.1 13.5
Settlements made (in cash or in kind) (16.4) (13.0)
Reserve balance at September 30, $ 11.1 $ 10.0