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Leases - Components of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Leases [Abstract]    
Operating lease expenses $ 3.9 $ 11.2
Finance lease expenses:    
Depreciation of finance ROU assets 0.3 0.8
Interest on lease liabilities 0.5 1.2
Total finance lease expense 0.8 2.0
Variable and short-term lease expense 1.0 3.3
Total lease expense $ 5.7 $ 16.5