Related Party Transactions - Schedule of Net Transfers (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Net transfers to (from) Parent per unaudited condensed consolidated statements of cash flows	$ 95.5	$ 127.6
Related Party
Related Party Transaction [Line Items]
Cash pooling and general financing activities	88.8	(241.7)
Licensing of content	9.7	428.8
Corporate reimbursements	(5.3)	5.9
Corporate expense allocations (excluding allocation of share-based compensation)	2.3	20.2
Funding of purchases of accounts receivables held for collateral	0.0	(85.6)
Net transfers to (from) Parent per unaudited condensed consolidated statements of cash flows	95.5	127.6
Share-based compensation (including allocation of share-based compensation)	(6.0)	(53.6)
Other non-cash transfer	(33.7)	16.6
Net transfers to (from) Parent per unaudited condensed consolidated statements of equity (deficit)	55.8	$ 90.6
Transfers to parent, net	$ 35.0