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Segment Information (Acquisition of Investment in Films and Television Programs by Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | $ 1,526.4 | $ 1,092.0 | $ 1,066.4
Reportable Segments | Motion Pictures |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | 462.0 | 412.7 | 639.9
Reportable Segments | Television Production |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | 706.8 | 506.6 | 426.5
Reportable Segments | Media Networks |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | $ 357.6 | $ 172.7 | $ 0.0

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