Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Segment revenues	$ 3,195.5	$ 2,986.4	$ 3,083.8
Direct operating	2,193.5	1,886.1	2,208.0
Distribution and marketing	395.9	462.3	304.2
Gross contribution	606.1	638.0	571.6
Segment general and administration	162.0	171.8	161.7
Segment profit	444.1	466.2	409.9
Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	1,589.7	1,656.3	1,323.7
Direct operating	824.2	796.0	666.5
Distribution and marketing	357.8	427.0	270.9
Gross contribution	407.7	433.3	386.3
Segment general and administration	100.1	113.9	109.8
Segment profit	307.6	319.4	276.5
Television Production
Segment Reporting Information [Line Items]
Segment revenues	1,605.8	1,330.1	1,760.1
Direct operating	1,369.3	1,090.1	1,541.5
Distribution and marketing	38.1	35.3	33.3
Gross contribution	198.4	204.7	185.3
Segment general and administration	61.9	57.9	51.9
Segment profit	$ 136.5	$ 146.8	$ 133.4