Revenue - Schedule of Revenues by Segment, Market or Product Line (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 713.8	$ 691.6	$ 2,125.8	$ 2,106.3
Motion Picture
Disaggregation of Revenue [Line Items]
Revenue	309.2	443.2	1,063.3	1,245.6
Television Production
Disaggregation of Revenue [Line Items]
Revenue	404.6	248.4	1,062.5	860.7
Operating Segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenue	309.2	443.2	1,063.3	1,245.6
Operating Segments | Motion Picture | Starz Business
Disaggregation of Revenue [Line Items]
Revenue	9.9	36.6	146.2	113.7
Operating Segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenue	35.0	100.1	91.1	194.2
Operating Segments | Motion Picture | Total Home Entertainment
Disaggregation of Revenue [Line Items]
Revenue	161.7	176.5	438.1	558.3
Operating Segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenue	145.7	155.5	400.3	495.3
Operating Segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenue	16.0	21.0	37.8	63.0
Operating Segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenue	38.3	65.3	235.0	214.5
Operating Segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenue	68.3	94.7	284.3	255.3
Operating Segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenue	5.9	6.6	14.8	23.3
Operating Segments | Television Production
Disaggregation of Revenue [Line Items]
Revenue	404.6	248.4	1,062.5	860.7
Operating Segments | Television Production | Starz Business
Disaggregation of Revenue [Line Items]
Revenue	77.9	97.1	267.3	308.4
Operating Segments | Television Production | Total Home Entertainment
Disaggregation of Revenue [Line Items]
Revenue	57.2	17.7	111.7	114.4
Operating Segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenue	55.5	17.4	108.7	113.4
Operating Segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenue	1.7	0.3	3.0	1.0
Operating Segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenue	259.9	182.3	733.1	554.2
Operating Segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenue	59.3	32.1	144.8	137.7
Operating Segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 28.2	$ 16.3	$ 72.9	$ 54.4