Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Segment revenues	$ 713.8	$ 691.6	$ 2,125.8	$ 2,106.3
Gross contribution	181.4	149.1	391.4	454.9
Segment general and administration	36.9	40.6	122.9	123.7
Segment profit	144.5	108.5	268.5	331.2
Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	309.2	443.2	1,063.3	1,245.6
Gross contribution	106.0	127.5	246.1	320.3
Segment general and administration	22.4	27.1	73.6	83.2
Segment profit	83.6	100.4	172.5	237.1
Television Production
Segment Reporting Information [Line Items]
Segment revenues	404.6	248.4	1,062.5	860.7
Gross contribution	75.4	21.6	145.3	134.6
Segment general and administration	14.5	13.5	49.3	40.5
Segment profit	$ 60.9	$ 8.1	$ 96.0	$ 94.1