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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Leases [Abstract]    
Short-term operating lease liabilities, Balance Sheet location us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Long-term operating lease liabilities, Balance Sheet location us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Operating lease costs $ 14.1  
Weighted-average remaining lease term (in years) 3 years 9 months 18 days  
Weighted-average discount rate (as a percent) 3.00%  
Cash paid for amounts included in measurement of operating lease liabilities $ 13.6  
Right-of-use assets obtained in exchange for new operating lease liabilities $ 6.1