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Commitments and Contingencies - Summary of Changes in Warranty Liabilities (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 7.4 $ 7.7
Provisions to expense 2.8 3.3
Payments (3.0) (3.2)
Balance at June 30 $ 7.2 $ 7.8