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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, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | $ 1,470.0 | $ 1,526.4 | $ 1,092.0
Reportable Segments | Motion Picture |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | 388.4 | 462.0 | 412.7
Reportable Segments | Television Production |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | 681.6 | 706.8 | 506.6
Reportable Segments | Media Networks |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | 594.3 | 483.5 | 218.6
Intersegment Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition of investment in films and television programs and program rights | $ (194.3) | $ (125.9) | $ (45.9)

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