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Product Warranties - Summary of Changes in Product Warranty Provision (Detail) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
Balance at beginning of period $ 45.3 $ 35.2 $ 31.4
Accruals for product warranties 17.0 28.0 16.0
Settlements made in cash or in kind (15.7) (17.9) (12.2)
Balance at end of period $ 46.6 $ 45.3 $ 35.2