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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 933.2 | $ 1,142.7 | $ 2,766.9 | $ 3,088.8
Operating segments | Motion Picture |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 362.6 | 539.1 | 1,106.9 | 1,397.0
Operating segments | Motion Picture | Theatrical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28.5 | 117.4 | 147.9 | 226.1
Operating segments | Motion Picture | Digital Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 81.7 | 85.0 | 253.0 | 277.1
Operating segments | Motion Picture | Packaged Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 68.0 | 104.0 | 209.0 | 311.5
Operating segments | Motion Picture | Home Entertainment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 149.7 | 189.0 | 462.0 | 588.6
Operating segments | Motion Picture | Television |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 74.8 | 90.5 | 207.6 | 222.3
Operating segments | Motion Picture | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 104.7 | 134.4 | 254.3 | 336.9
Operating segments | Motion Picture | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4.9 | 7.8 | 35.1 | 23.1
Operating segments | Television Production |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 216.5 | 266.2 | 648.1 | 738.7
Operating segments | Television Production | Television |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 151.5 | 184.6 | 454.4 | 515.5
Operating segments | Television Production | Digital Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10.9 | 25.7 | 54.1 | 92.4
Operating segments | Television Production | Packaged Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2.5 | 4.1 | 5.9 | 10.0
Operating segments | Television Production | Home Entertainment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13.4 | 29.8 | 60.0 | 102.4
Operating segments | Television Production | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35.9 | 51.1 | 94.7 | 118.8
Operating segments | Television Production | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15.7 | 0.7 | 39.0 | 2.0
Operating segments | Media Networks |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 366.8 | 353.5 | 1,099.0 | 1,057.8
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (12.7) | (16.1) | (87.1) | (104.7)
Intersegment Eliminations | Motion Picture |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (3.2) | (2.3) | (7.6) | (8.4)
Intersegment Eliminations | Television Production |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (9.5) | (13.2) | (79.4) | (95.4)
Intersegment Eliminations | Media Networks |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0.0 | (0.6) | $ (0.1) | (0.9)
Revenues | Operating segments | Motion Picture | Theatrical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Prior period reclassification adjustment |  | 8.1 |  | 8.1
Revenues | Operating segments | Motion Picture | Packaged Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Prior period reclassification adjustment |  | 3.7 |  | 3.7
Revenues | Operating segments | Motion Picture | Television |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Prior period reclassification adjustment |  | 5.1 |  | 5.1
Revenues | Operating segments | Motion Picture | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Prior period reclassification adjustment |  | $ (16.9) |  | $ (16.9)

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