Segment Information - Acquisition of Investment in Films and Television Programs and Program Rights by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	$ 1,667.3	$ 1,120.5	$ 1,568.4
Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	1,968.6	1,409.3	1,979.2
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	642.3	418.1	484.5
Reportable Segments | Motion Picture | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	642.3	416.6	483.6
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	1,025.0	702.4	1,083.9
Reportable Segments | Television Production | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	1,024.1	712.8	1,082.0
Reportable Segments | Media Networks | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	946.7	852.8	1,173.0
Intersegment Eliminations | Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	$ (644.5)	$ (572.9)	$ (759.4)