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Segment Information (Segment Revenues By Media or Product Line) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 1,142.7 | $ 752.3 | $ 3,088.8 | $ 1,945.4
Reportable Segments | Motion Pictures |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 539.1 | 440.4 | 1,397.0 | 1,266.5
Reportable Segments | Motion Pictures | Theatrical |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 109.3 | 87.4 | 218.0 | 196.6
Reportable Segments | Motion Pictures | Home Entertainment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 185.3 | 167.0 | 584.9 | 467.4
Reportable Segments | Motion Pictures | Television |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 85.4 | 91.3 | 217.2 | 213.9
Reportable Segments | Motion Pictures | International |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 134.4 | 90.2 | 336.9 | 372.3
Reportable Segments | Motion Pictures | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 24.7 | 4.5 | 40.0 | 16.3
Reportable Segments | Television Production |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 227.3 | 228.6 | 552.8 | 595.0
Reportable Segments | Television Production | Home Entertainment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 20.2 | 23.3 | 26.8 | 33.4
Reportable Segments | Television Production | International |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 32.2 | 31.3 | 84.5 | 75.1
Reportable Segments | Television Production | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 1.0 | 0.5 | 5.1 | 5.7
Reportable Segments | Television Production | Domestic Television |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 173.9 | 173.5 | 436.4 | 480.8
Reportable Segments | Media Networks |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 382.9 | 85.2 | 1,166.8 | 85.8
Reportable Segments | Media Networks | Starz Networks |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 351.8 | 82.8 | 1,053.7 | 82.8
Reportable Segments | Media Networks | Content And Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 29.4 | 1.4 | 109.0 | 1.4
Reportable Segments | Media Networks | Streaming Services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 1.7 | 1.0 | 4.1 | 1.6
Intersegment Eliminations |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (6.6) | (1.9) | (27.8) | (1.9)
Intersegment Eliminations | Motion Pictures |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (2.3) | (1.4) | (8.4) | (1.4)
Intersegment Eliminations | Television Production |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (3.7) | (0.1) | (18.5) | (0.1)
Intersegment Eliminations | Media Networks |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ (0.6) | $ (0.4) | $ (0.9) | $ (0.4)

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