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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	Jun. 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	$ 1,872.1	$ 1,945.2
Less current portion of program rights	(225.5)	(253.2)
Non-current portion	1,646.6	1,692.0
Motion Pictures | Theatrical And Non-Theatrical Films
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	383.4	410.5
Acquired libraries, net of accumulated amortization	2.0	2.1
Completed and not released	127.9	55.0
In progress	307.9	347.2
In development	21.0	24.6
Total investment in film and television programs	842.2	839.4
Television Production | Direct-to-Television Programs
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	234.7	238.9
In progress	120.7	186.6
In development	5.4	4.8
Total investment in film and television programs	360.8	430.3
Media Networks
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	595.1	616.9
In progress	75.4	45.6
In development	29.5	30.0
Total investment in films and television programs and program rights, net	700.0	692.5
Intersegment eliminations	$ (30.9)	$ (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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