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Segment Information (Segment Information By Business Unit) (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable business segments | segment |  |  | 3 |
Segment revenues | $ 933.2 | $ 1,142.7 | $ 2,766.9 | $ 3,088.8
Gross contribution | 257.8 | 266.8 | 681.0 | 730.7
Segment general and administration | 60.2 | 61.8 | 184.8 | 184.9
Segment profit | 197.6 | 205.0 | 496.2 | 545.8
Reportable Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment general and administration | 60.2 | 61.8 | 184.8 | 184.9
Segment profit | 197.6 | 205.0 | 496.2 | 545.8
Reportable Segments | Motion Picture |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | 362.6 | 539.1 | 1,106.9 | 1,397.0
Gross contribution | 69.2 | 82.1 | 186.3 | 230.9
Segment general and administration | 25.7 | 27.8 | 78.6 | 81.1
Segment profit | 43.5 | 54.3 | 107.7 | 149.8
Reportable Segments | Television Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | 216.5 | 266.2 | 648.1 | 738.7
Gross contribution | 32.6 | 36.4 | 79.4 | 117.8
Segment general and administration | 11.4 | 8.6 | 32.9 | 28.3
Segment profit | 21.2 | 27.8 | 46.5 | 89.5
Reportable Segments | Media Networks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | 366.8 | 353.5 | 1,099.0 | 1,057.8
Gross contribution | 157.2 | 147.8 | 418.7 | 390.0
Segment general and administration | 23.1 | 25.4 | 73.3 | 75.5
Segment profit | 134.1 | 122.4 | 345.4 | 314.5
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | (12.7) | (16.1) | (87.1) | (104.7)
Gross contribution | (1.2) | 0.5 | (3.4) | (8.0)
Segment profit | (1.2) | 0.5 | (3.4) | (8.0)
Intersegment Eliminations | Motion Picture |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | (3.2) | (2.3) | (7.6) | (8.4)
Intersegment Eliminations | Television Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | (9.5) | (13.2) | (79.4) | (95.4)
Intersegment Eliminations | Media Networks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | $ 0.0 | $ (0.6) | $ (0.1) | $ (0.9)

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