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Significant Accounting Policies - Product Warranty (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]      
Balance at beginning of period $ 7.7 $ 6.2 $ 5.5
Acquired obligations 0.0 1.4 0.4
Charged to operations 1.9 4.1 3.2
Claims settled (2.4) (4.0) (2.9)
Balance at end of period $ 7.2 $ 7.7 $ 6.2