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Investment In Films and Television Programs and Program Rights (Schedule of Investment In Films And Television Programs) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Investment in Films and Television Programs and Program Rights [Line Items]
Intersegment eliminations	$ (13.4)	$ (40.1)
Investment in films and television programs and program rights, net	1,827.8	1,967.7
Less current portion of program rights	(310.5)	(295.7)
Non-current portion	1,517.3	1,672.0
Motion Picture | Theatrical And Non-Theatrical Films
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	329.5	376.7
Acquired libraries, net of accumulated amortization	0.5	1.8
Completed and not released	53.9	80.6
In progress	96.9	250.4
In development	44.4	45.0
Total investment in film and television programs	525.2	754.5
Television Production | Direct-to-Television Programs
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	220.7	186.1
In progress	271.6	295.6
In development	20.3	17.6
Total investment in film and television programs	512.6	499.3
Media Networks
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	678.7	591.0
In progress	93.7	106.8
In development	31.0	56.2
Investment in films and television programs and program rights, net	$ 803.4	$ 754.0

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Investment in films and television programs represents the carrying amount of unamortized costs of completed films and television programs which have been produced or acquired, libraries acquired as part of acquisitions of companies, and films and television programs in progress and in development. Capitalized costs include production costs, production overhead, interest, development costs and acquired production costs. The carrying amount is stated at the lower of cost, less accumulated amortization, or fair value at the balance sheet date. Program rights include unamortized costs relating to rights to exhibit feature films, movies, television series and other acquired programming on networks. For a classified balance sheet, represents the noncurrent portion only of investment in films and television programs and program rights.

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