Film Obligations and Production Loans (Components) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Mar. 31, 2019
Film Obligations And Production Loans [Abstract]
Film obligations	$ 211.2	$ 270.3
Production loans	269.7	386.4
Total film obligations and production loans	480.9	656.7
Unamortized debt issuance costs	(0.7)	(1.0)
Total film obligations and production loans, net	480.2	655.7
Less current portion	(343.9)	(512.6)
Total non-current film obligations and production loans	$ 136.3	$ 143.1