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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Returns and Allowances      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 35.0 $ 56.2 $ 68.6
Charged to Costs and Expenses 81.2 126.0 168.3
Charged to Other Accounts 0.0 0.0 0.0
Deductions (82.5) (147.2) (180.7)
Balance at End of Period 33.7 35.0 56.2
Provision for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 5.4 7.5 9.0
Charged to Costs and Expenses 5.7 (2.0) (1.0)
Charged to Other Accounts 0.0 0.0 0.0
Deductions (1.8) (0.1) (0.5)
Balance at End of Period 9.3 5.4 7.5
Deferred Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 401.1 73.2 5.9
Charged to Costs and Expenses 4.5 313.9 67.3
Charged to Other Accounts 30.2 14.0 0.0
Deductions 0.0 0.0 0.0
Balance at End of Period $ 435.8 $ 401.1 $ 73.2