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Commitments and Contingencies - Summary of Changes in Warranty Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 8.4 $ 6.8
Provisions to expense 1.7 2.2
Payments (1.6) (1.8)
Balance at September 30 $ 8.5 $ 7.2