Segment Information - Reconciliation of Total Assets By Segment to Consolidated Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 5,115.2	$ 5,103.0
Lions Gate Entertainment Corp.
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,822.1	7,092.7
Operating Segments | Motion Picture
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,867.4	1,851.4
Operating Segments | Motion Picture | Lions Gate Entertainment Corp.
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,867.4	1,851.4
Operating Segments | Television Production
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,279.3	2,347.8
Operating Segments | Television Production | Lions Gate Entertainment Corp.
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,279.3	2,347.8
Operating Segments | Media Networks | Lions Gate Entertainment Corp.
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,041.8	2,036.7
Other Unallocated Assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,115.2	5,103.0
Other Unallocated Assets | Lions Gate Entertainment Corp.
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 633.6	$ 856.8