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Segment Information (Segment Revenues By Media or Product Line) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 940.8 | $ 639.5 | $ 1,946.1 | $ 1,193.1
Reportable Segments | Motion Pictures |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 385.7 | 464.0 | 858.0 | 826.3
Reportable Segments | Motion Pictures | Theatrical |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 57.9 | 62.0 | 108.7 | 109.2
Reportable Segments | Motion Pictures | Home Entertainment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 165.7 | 157.1 | 399.7 | 300.4
Reportable Segments | Motion Pictures | Television |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 74.2 | 69.3 | 131.8 | 122.7
Reportable Segments | Motion Pictures | International |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 79.9 | 168.3 | 202.3 | 282.0
Reportable Segments | Motion Pictures | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 8.0 | 7.3 | 15.5 | 12.0
Reportable Segments | Television Production |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 168.7 | 175.1 | 325.4 | 366.2
Reportable Segments | Television Production | Home Entertainment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 3.0 | 3.2 | 6.5 | 10.0
Reportable Segments | Television Production | International |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 29.3 | 15.9 | 52.6 | 43.7
Reportable Segments | Television Production | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 2.2 | 1.6 | 3.9 | 5.1
Reportable Segments | Television Production | Domestic Television |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 134.2 | 154.4 | 262.4 | 307.4
Reportable Segments | Media Networks |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 393.4 | 0.4 | 783.9 | 0.6
Reportable Segments | Media Networks | Starz Networks |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 358.6 | 0.0 | 701.8 | 0.0
Reportable Segments | Media Networks | Content And Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 33.7 | 0.0 | 79.6 | 0.0
Reportable Segments | Media Networks | Streaming Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 1.1 | 0.4 | 2.5 | 0.6
Intersegment Eliminations |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (7.0) | 0.0 | (21.2) | 0.0
Intersegment Eliminations | Motion Pictures |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (2.5) | 0.0 | (5.9) | 0.0
Intersegment Eliminations | Television Production |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (4.5) | 0.0 | (15.0) | 0.0
Intersegment Eliminations | Media Networks |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 0.0 | $ 0.0 | $ (0.3) | $ 0.0

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