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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 901.0 | $ 940.8 | $ 1,833.6 | $ 1,946.1
Operating segments | Motion Picture |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 379.0 | 385.7 | 744.3 | 858.0
Operating segments | Motion Picture | Theatrical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 69.1 | 57.9 | 119.5 | 108.7
Operating segments | Motion Picture | Digital Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 85.1 | 90.4 | 171.3 | 192.0
Operating segments | Motion Picture | Packaged Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 64.5 | 75.3 | 141.0 | 207.7
Operating segments | Motion Picture | Home Entertainment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 149.6 | 165.7 | 312.3 | 399.7
Operating segments | Motion Picture | Television |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 70.9 | 74.2 | 132.8 | 131.8
Operating segments | Motion Picture | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 82.2 | 79.9 | 149.6 | 202.3
Operating segments | Motion Picture | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7.2 | 8.0 | 30.1 | 15.5
Operating segments | Television Production |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 152.1 | 211.2 | 431.5 | 472.4
Operating segments | Television Production | Television |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 85.1 | 143.3 | 302.9 | 330.7
Operating segments | Television Production | Digital Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 27.0 | 25.1 | 43.3 | 66.7
Operating segments | Television Production | Packaged Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1.6 | 4.8 | 3.4 | 5.8
Operating segments | Television Production | Home Entertainment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28.6 | 29.9 | 46.7 | 72.5
Operating segments | Television Production | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 21.8 | 36.8 | 58.8 | 68.1
Operating segments | Television Production | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 16.6 | 1.2 | 23.1 | 1.1
Operating segments | Media Networks |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 377.3 | 359.7 | 732.2 | 704.3
Operating segments | Media Networks | Starz Networks - programming revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 373.7 | 358.6 | 724.9 | 701.8
Operating segments | Media Networks | Streaming Services - programming revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3.6 | 1.1 | 7.3 | 2.5
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (7.4) | (15.8) | (74.4) | (88.6)
Intersegment Eliminations | Motion Picture |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (2.2) | (2.5) | (4.3) | (5.9)
Intersegment Eliminations | Television Production |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (5.2) | (13.3) | (70.0) | (82.4)
Intersegment Eliminations | Media Networks |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0.0 | $ 0.0 | $ (0.1) | $ (0.3)

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