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Investment In Films and Television Programs and Program Rights (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Investment In Films And Television Programs and Program Rights [Abstract] |  |  |  |
Fair value film write-downs | $ 10.5 | $ 24.2 | $ 17.4 | $ 26.8

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