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Product Warranties - Summary of Changes in Product Warranty Provision (Detail) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]      
Balance at beginning of period $ 52.8 $ 46.6 $ 45.3
(Decrease) increase for product warranties accrual (0.8) 13.1 17.0
Acquired during the period 0.5 0.0 0.0
Settlements made in cash or in kind (5.9) (6.9) (15.7)
Balance at end of period $ 46.6 $ 52.8 $ 46.6