Segment Information - Schedule of Reconciliation of Total Segment Assets to Total Consolidated Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Mar. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 5,374.5	$ 5,103.0
Operating Segments | Motion Picture
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,916.8	1,851.4
Operating Segments | Television Production
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,555.6	2,347.8
Operating Segments | Other unallocated assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	902.1	903.8
Other Unallocated Assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 5,374.5	$ 5,103.0