Revenue - Schedule of Revenues by Segment, Market or Product Line (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 3,195.5	$ 2,986.4	$ 3,083.8
Starz Business
Disaggregation of Revenue [Line Items]
Revenue	619.7	545.9	775.5
Motion Picture
Disaggregation of Revenue [Line Items]
Revenue	1,589.7	1,656.3	1,323.7
Television Production
Disaggregation of Revenue [Line Items]
Revenue	1,605.8	1,330.1	1,760.1
Operating Segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenue	1,589.7	1,656.3	1,323.7
Operating Segments | Motion Picture | Starz Business
Disaggregation of Revenue [Line Items]
Revenue	203.3	128.2	44.2
Operating Segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenue	154.1	226.5	120.7
Operating Segments | Motion Picture | Total Home Entertainment
Disaggregation of Revenue [Line Items]
Revenue	658.2	736.3	598.0
Operating Segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenue	598.2	652.3	527.5
Operating Segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenue	60.0	84.0	70.5
Operating Segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenue	347.3	274.4	217.8
Operating Segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenue	401.5	391.0	365.0
Operating Segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenue	28.6	28.1	22.2
Operating Segments | Television Production
Disaggregation of Revenue [Line Items]
Revenue	1,605.8	1,330.1	1,760.1
Operating Segments | Television Production | Starz Business
Disaggregation of Revenue [Line Items]
Revenue	416.4	417.7	731.3
Operating Segments | Television Production | Total Home Entertainment
Disaggregation of Revenue [Line Items]
Revenue	188.1	242.6	245.0
Operating Segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenue	184.0	240.6	241.7
Operating Segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenue	4.1	2.0	3.3
Operating Segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenue	1,069.4	788.5	1,144.3
Operating Segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenue	248.2	228.8	277.7
Operating Segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 100.1	$ 70.2	$ 93.1