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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 932.7 | $ 1,005.3
Operating segments | Motion Pictures |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 365.3 | 472.4
Operating segments | Motion Pictures | Theatrical |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 50.3 | 50.8
Operating segments | Motion Pictures | Digital Media |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 86.2 | 101.5
Operating segments | Motion Pictures | Packaged Media |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 76.5 | 132.5
Operating segments | Motion Pictures | Home Entertainment |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 162.7 | 234.0
Operating segments | Motion Pictures | Television |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 61.8 | 57.7
Operating segments | Motion Pictures | International |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 67.3 | 122.8
Operating segments | Motion Pictures | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 23.2 | 7.1
Operating segments | Television Production |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 279.4 | 261.2
Operating segments | Television Production | Domestic Television |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 217.7 | 187.5
Operating segments | Television Production | Digital Media |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 16.3 | 41.6
Operating segments | Television Production | Packaged Media |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1.8 | 1.1
Operating segments | Television Production | Home Entertainment |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 18.1 | 42.7
Operating segments | Television Production | International |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 37.0 | 30.9
Operating segments | Television Production | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 6.6 | 0.1
Operating segments | Media Networks |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 354.9 | 344.6
Operating segments | Media Networks | Starz Networks - subscription revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 351.2 | 343.2
Operating segments | Media Networks | Streaming Services - subscription revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3.7 | 1.4
Intersegment Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (66.9) | (72.9)
Intersegment Eliminations | Motion Pictures |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (2.1) | (5.1)
Intersegment Eliminations | Television Production |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (64.8) | (67.8)
Intersegment Eliminations | Media Networks |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 0.0 | $ 0.0

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