Segment Information - Narrative (Details) $ in Millions	12 Months Ended
Mar. 31, 2025 USD ($) segment	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)
Concentration Risk [Line Items]
Number of reportable segments \| segment	2
Segment revenues	$ 3,195.5	$ 2,986.4	$ 3,083.8
Lions Gate Entertainment Corp.
Concentration Risk [Line Items]
Number of reportable segments \| segment	3
Segment revenues	$ 3,947.9	4,016.9	3,854.8
Customer Concentration Risk \| Revenue Benchmark \| One Customer
Concentration Risk [Line Items]
Segment revenues	$ 513.4	$ 411.1	$ 337.1
Concentration risk, percentage	10.00%	10.00%	10.00%
Customer Concentration Risk \| Revenue Benchmark \| One Customer \| Lions Gate Entertainment Corp.
Concentration Risk [Line Items]
Segment revenues	$ 922.0	$ 831.0	$ 766.6
Concentration risk, percentage	10.00%	10.00%	10.00%
Customer Concentration Risk \| Accounts Receivable \| One Customer \| Lions Gate Entertainment Corp.
Concentration Risk [Line Items]
Concentration risk, percentage		11.60%
Accounts receivable, after allowance for credit loss		$ 100.9
Customer Concentration Risk \| Accounts Receivable \| Customer One
Concentration Risk [Line Items]
Concentration risk, percentage	12.80%	12.50%
Accounts receivable, after allowance for credit loss	$ 83.1	$ 100.9
Customer Concentration Risk \| Accounts Receivable \| Customer One \| Lions Gate Entertainment Corp.
Concentration Risk [Line Items]
Concentration risk, percentage	11.80%
Accounts receivable, after allowance for credit loss	$ 83.8
Customer Concentration Risk \| Accounts Receivable \| Customer Two
Concentration Risk [Line Items]
Concentration risk, percentage	10.50%	10.70%
Accounts receivable, after allowance for credit loss	$ 68.1	$ 86.8
Customer Concentration Risk \| Accounts Receivable \| Customer Two \| Lions Gate Entertainment Corp.
Concentration Risk [Line Items]
Concentration risk, percentage	10.30%
Accounts receivable, after allowance for credit loss	$ 72.8

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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