Related Party Transactions - Transactions with Equity Method Investees (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Consolidated Balance Sheets
Accounts receivable	$ 576.0	$ 688.6
Accounts payable	248.2	246.7
Deferred revenue	235.5	170.6
Consolidated Statements of Operations
Revenue	3,195.5	2,986.4	$ 3,083.8
Direct operating	2,210.0	1,886.7	2,207.9
Equity Method Investee
Consolidated Balance Sheets
Accounts receivable	8.7	8.1
Investment in films and television programs	1.1	2.2
Total due from related parties	9.8	10.3
Accounts payable	17.6	16.8
Participations and residuals, current	11.1	5.5
Participations and residuals, noncurrent	1.8	1.3
Deferred revenue	0.1	0.1
Total due to related parties	30.6	23.7
Consolidated Statements of Operations
Revenue	3.3	3.0	4.8
Direct operating	4.6	5.0	8.3
Distribution and marketing expense	$ 3.0	$ 0.8	$ 0.4