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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Accounts receivable previously reserved from customers in Russia $ 0.5    
Valuation allowance, opening balance from acquisition of eOne 187.0    
Receivables Impacted By Russia's Invasion Of Ukraine      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Accounts receivable previously reserved from customers in Russia   $ 2.5  
Returns and Allowances      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 17.6 19.3 $ 26.1
Charged to Costs and Expenses 33.1 40.6 44.4
Charged to Other Accounts 0.0 0.0 0.0
Deductions (32.8) (42.3) (51.2)
Balance at End of Period 17.9 17.6 19.3
Provision for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 9.2 11.5 6.5
Charged to Costs and Expenses 0.5 1.1 5.3
Charged to Other Accounts 1.3 0.0 0.0
Deductions (3.8) (3.4) (0.3)
Balance at End of Period 7.2 9.2 11.5
Deferred Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 455.7 362.8 350.9
Charged to Costs and Expenses 164.7 115.9 40.4
Charged to Other Accounts 187.9 (23.0) (28.5)
Deductions 0.0 0.0 0.0
Balance at End of Period $ 808.3 $ 455.7 $ 362.8