Related Party Transactions - Schedule of Net Transfers (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Related Party Transaction [Line Items]
Net transfers from Parent per combined statements of cash flows	$ (72.5)	$ (129.5)	$ (347.7)
Net Cash Flows Provided By Financing Activities - Discontinued Operations	2.8	146.7	228.0
Share-based compensation from discontinued operations	0.3	1.8	3.0
Related Party
Related Party Transaction [Line Items]
Net transfers from Parent per combined statements of cash flows	(75.3)	(276.2)	(575.7)
Share-based compensation (including allocation of share-based compensation)	(18.3)	(26.4)	(28.7)
Other non-cash transfer	35.2	0.0	0.0
Net transfers from Parent per combined statements of equity (deficit)	(58.4)	(302.6)	(604.4)
Transfers to parent, net	35.0
Related Party \| Cash pooling and general financing activities
Related Party Transaction [Line Items]
Net transfers from Parent per combined statements of cash flows	(79.0)	223.3	(10.6)
Related Party \| Licensing of content
Related Party Transaction [Line Items]
Net transfers from Parent per combined statements of cash flows	0.8	(550.1)	(713.2)
Related Party \| Operating expense reimbursement
Related Party Transaction [Line Items]
Net transfers from Parent per combined statements of cash flows	5.3	(7.0)	(13.3)
Related Party \| Corporate expense allocations (excluding allocation of share-based compensation)
Related Party Transaction [Line Items]
Net transfers from Parent per combined statements of cash flows	(2.4)	(27.9)	(22.3)
Related Party \| Proceeds from sales of accounts receivable
Related Party Transaction [Line Items]
Net transfers from Parent per combined statements of cash flows	$ 0.0	$ 85.5	$ 183.7

Discontinued Operations, Share-Based Compensation

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Other Transfers To (From) Parent, Net

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Payments to (Proceeds From) Parent, Net Investment, Including Discontinued Operations

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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