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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, 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	$ 1,917.0	$ 1,945.2
Less current portion of program rights	(247.0)	(253.2)
Non-current portion	1,670.0	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	416.9	410.5
Acquired libraries, net of accumulated amortization	1.5	2.1
Completed and not released	59.4	55.0
In progress	263.4	347.2
In development	25.8	24.6
Total investment in film and television programs	767.0	839.4
Television Production | Direct-to-Television Programs
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	184.5	238.9
In progress	297.3	186.6
In development	22.3	4.8
Total investment in film and television programs	504.1	430.3
Media Networks
Investment in Films and Television Programs and Program Rights [Line Items]
Released, net of accumulated amortization	552.5	616.9
In progress	81.5	45.6
In development	56.2	30.0
Total investment in films and television programs and program rights, net	690.2	692.5
Intersegment eliminations	$ (44.3)	$ (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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