Revenue - Schedule of Revenues by Segment, Market or Product Line (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 823.7	$ 789.8	$ 1,412.0	$ 1,414.9
Motion Picture
Disaggregation of Revenue [Line Items]
Revenue	407.1	395.9	754.0	802.5
Television Production
Disaggregation of Revenue [Line Items]
Revenue	416.6	393.9	658.0	612.4
Operating Segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenue	407.1	395.9	754.0	802.5
Operating Segments | Motion Picture | Starz Business
Disaggregation of Revenue [Line Items]
Revenue	72.1	60.5	136.3	77.1
Operating Segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenue	20.1	28.2	56.1	94.1
Operating Segments | Motion Picture | Total Home Entertainment
Disaggregation of Revenue [Line Items]
Revenue	127.0	181.8	276.4	381.8
Operating Segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenue	114.5	165.7	254.6	339.8
Operating Segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenue	12.5	16.1	21.8	42.0
Operating Segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenue	108.7	100.8	196.7	149.3
Operating Segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenue	148.0	79.7	216.0	160.7
Operating Segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenue	3.3	5.4	8.8	16.6
Operating Segments | Television Production
Disaggregation of Revenue [Line Items]
Revenue	416.6	393.9	658.0	612.4
Operating Segments | Television Production | Starz Business
Disaggregation of Revenue [Line Items]
Revenue	149.9	130.3	189.4	211.3
Operating Segments | Television Production | Total Home Entertainment
Disaggregation of Revenue [Line Items]
Revenue	34.8	84.5	54.5	96.7
Operating Segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenue	34.3	84.2	53.2	96.0
Operating Segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenue	0.5	0.3	1.3	0.7
Operating Segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenue	313.1	221.8	473.2	371.9
Operating Segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenue	49.7	73.6	85.5	105.6
Operating Segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 19.0	$ 14.0	$ 44.8	$ 38.2