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Segment Information (Segment Information By Business Unit) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($) segment
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable business segments | segment |  |  | 3 | 2
Segment revenues | $ 940.8 | $ 639.5 | $ 1,946.1 | $ 1,193.1
Gross contribution | 195.3 | 33.9 | 463.9 | 100.6
Segment general and administration | 61.4 | 36.1 | 123.1 | 71.0
Segment profit (loss) | 133.9 | (2.2) | 340.8 | 29.6
Reportable Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment general and administration | 61.4 | 36.1 | 123.1 | 71.0
Segment profit (loss) | 133.9 | (2.2) | 340.8 | 29.6
Reportable Segments | Motion Pictures |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | 385.7 | 464.0 | 858.0 | 826.3
Gross contribution | 35.2 | 19.5 | 149.1 | 75.9
Segment general and administration | 26.3 | 24.5 | 53.2 | 49.1
Segment profit (loss) | 8.9 | (5.0) | 95.9 | 26.8
Reportable Segments | Television Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | 168.7 | 175.1 | 325.4 | 366.2
Gross contribution | 19.2 | 19.9 | 40.7 | 37.1
Segment general and administration | 10.6 | 8.4 | 19.7 | 16.0
Segment profit (loss) | 8.6 | 11.5 | 21.0 | 21.1
Reportable Segments | Media Networks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | 393.4 | 0.4 | 783.9 | 0.6
Gross contribution | 141.0 | (5.5) | 276.1 | (12.4)
Segment general and administration | 24.5 | 3.2 | 50.2 | 5.9
Segment profit (loss) | 116.5 | (8.7) | 225.9 | (18.3)
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | (7.0) | 0.0 | (21.2) | 0.0
Gross contribution | (0.1) | 0.0 | (2.0) | 0.0
Segment profit (loss) | (0.1) | 0.0 | (2.0) | 0.0
Intersegment Eliminations | Motion Pictures |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | (2.5) | 0.0 | (5.9) | 0.0
Intersegment Eliminations | Television Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | (4.5) | 0.0 | (15.0) | 0.0
Intersegment Eliminations | Media Networks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment revenues | $ 0.0 | $ 0.0 | $ (0.3) | $ 0.0

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