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Segment Information (Acquisition of Investment in Films and Television Programs and Program Rights by Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | $ 1,545.3 | $ 1,469.9 | $ 1,526.4
Reportable Segments | Motion Picture |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | 349.8 | 388.4 | 462.0
Reportable Segments | Television Production |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | 743.3 | 743.2 | 706.8
Reportable Segments | Media Networks |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | 640.7 | 555.5 | 483.5
Intersegment Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | $ (188.5) | $ (217.2) | $ (125.9)

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