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Segment Information (Segment Information By Business Unit) (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable business segments | segment |  |  | 3 |
Segment revenues | $ 1,142.7 | $ 752.3 | $ 3,088.8 | $ 1,945.4
Gross contribution | 266.8 | 151.6 | 730.7 | 252.2
Segment general and administration | 61.8 | 40.5 | 184.9 | 111.5
Segment profit (loss) | 205.0 | 111.1 | 545.8 | 140.7
Reportable Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment general and administration | 61.8 | 40.5 | 184.9 | 111.5
Segment profit (loss) | 205.0 | 111.1 | 545.8 | 140.7
Reportable Segments | Motion Pictures |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | 539.1 | 440.4 | 1,397.0 | 1,266.5
Gross contribution | 82.1 | 79.2 | 230.9 | 154.8
Segment general and administration | 27.8 | 25.4 | 81.1 | 74.5
Segment profit (loss) | 54.3 | 53.8 | 149.8 | 80.3
Reportable Segments | Television Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | 227.3 | 228.6 | 552.8 | 595.0
Gross contribution | 31.3 | 32.3 | 72.4 | 69.6
Segment general and administration | 8.6 | 6.7 | 28.3 | 22.7
Segment profit (loss) | 22.7 | 25.6 | 44.1 | 46.9
Reportable Segments | Media Networks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | 382.9 | 85.2 | 1,166.8 | 85.8
Gross contribution | 153.7 | 40.5 | 429.7 | 28.2
Segment general and administration | 25.4 | 8.4 | 75.5 | 14.3
Segment profit (loss) | 128.3 | 32.1 | 354.2 | 13.9
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | (6.6) | (1.9) | (27.8) | (1.9)
Gross contribution | (0.3) | (0.4) | (2.3) | (0.4)
Segment profit (loss) | (0.3) | (0.4) | (2.3) | (0.4)
Intersegment Eliminations | Motion Pictures |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | (2.3) | (1.4) | (8.4) | (1.4)
Intersegment Eliminations | Television Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | (3.7) | (0.1) | (18.5) | (0.1)
Intersegment Eliminations | Media Networks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | $ (0.6) | $ (0.4) | $ (0.9) | $ (0.4)

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