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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	Sep. 30, 2018	Mar. 31, 2018
Investment in Films and Television Programs and Program Rights [Line Items]
Total investment in films and television programs and program rights, net	$ 1,897.1	$ 1,945.2
Less current portion of program rights	(234.2)	(253.2)
Non-current portion	1,662.9	1,692.0
Motion Picture | Theatrical And Non-Theatrical Films
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	417.4	410.5
Acquired libraries, net of accumulated amortization	1.6	2.1
Completed and not released	93.3	55.0
In progress	268.4	347.2
In development	23.0	24.6
Total investment in film and television programs	803.7	839.4
Television Production | Direct-to-Television Programs
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	188.8	238.9
In progress	239.2	186.6
In development	9.9	4.8
Total investment in film and television programs	437.9	430.3
Media Networks
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	530.7	616.9
In progress	114.2	45.6
In development	52.8	30.0
Total investment in films and television programs and program rights, net	697.7	692.5
Intersegment eliminations	$ (42.2)	$ (17.0)

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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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