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 expense	2,210.0	1,886.7	2,207.9
Interest and other income	14.8	19.2	6.4
Lions Gate Entertainment Corp.
Consolidated Balance Sheets
Accounts receivable	636.5	753.0
Accounts payable	310.1	327.6
Deferred revenue	240.1	187.6
Consolidated Statements of Operations
Revenue	3,947.9	4,016.9	3,854.8
Direct operating expense	2,352.1	2,189.2	2,312.5
Interest and other income	15.1	22.1	6.4
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 expense	4.6	5.0	8.3
Distribution and marketing expense	3.0	0.8	0.4
Equity Method Investee | Lions Gate Entertainment Corp.
Consolidated Balance Sheets
Accounts receivable	11.7	11.1
Investment in films and television programs	1.1	2.2
Total due from related parties	12.8	13.3
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	4.0	4.2	6.1
Direct operating expense	4.6	5.0	8.3
Distribution and marketing expense	3.0	0.8	0.4
Interest and other income	$ 0.0	$ 0.0	$ 1.7