Investment in Films and Television Programs - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Investment in Films And Television Programs [Abstract]
Acquired film and television libraries, unamortized costs	$ 245.0		$ 245.0		$ 223.1
Acquired libraries, remaining amortization period (in years)			13 years 6 months
Amortization of films and television programs and program rights	$ 335.5	$ 311.4	$ 1,053.3	$ 948.1