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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	Dec. 31, 2017	Mar. 31, 2017
Investment in Films and Television Programs and Program Rights [Line Items]
Total investment in films and television programs and program rights, net	$ 1,901.5	$ 1,991.2
Less current portion of program rights	(215.6)	(261.7)
Non-current portion	1,685.9	1,729.5
Motion Pictures | Theatrical And Non-Theatrical Films
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	451.7	610.5
Acquired libraries, net of accumulated amortization	3.2	2.3
Completed and not released	22.9	24.1
In progress	328.3	169.3
In development	29.1	29.7
Total investment in film and television programs	835.2	835.9
Television Production | Direct-to-Television Programs
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	173.4	179.3
In progress	137.0	104.1
In development	11.3	7.3
Total investment in film and television programs	321.7	290.7
Media Networks
Investment in Films and Television Programs and Program Rights [Line Items]
Total investment in films and television programs and program rights, net	744.6	864.6
Media Networks | Licensed Program Rights
Investment in Films and Television Programs and Program Rights [Line Items]
Licensed program rights, net of accumulated amortization	460.7	526.9
Media Networks | Produced Programming
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	135.5	132.7
In progress	127.0	200.9
In development	$ 21.4	$ 4.1

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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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The carrying amount of unamortized costs of completed films and television programs which have been produced by the Company or for which the Company has acquired distribution rights, libraries acquired as part of acquisitions of companies, films and television programs in progress and in development and home entertainment product inventory. 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.

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