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Commitments and Contingencies - Summary of Changes in Warranty Liabilities (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 9.1 $ 8.4
Provisions to expense 5.1 5.2
Payments (5.6) (5.5)
Balance at September 30 $ 8.6 $ 8.1