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Segment Information (Segment Information By Business Unit) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) segment | Jun. 30, 2016 USD ($) | Sep. 30, 2016 segment
Segment Reporting Information [Line Items] |  |  |
Number of reportable business segments | segment | 3 |  | 2
Segment revenues | $ 1,005.3 | $ 553.6 |
Gross contribution | 268.6 | 66.6 |
Segment general and administration | 61.6 | 34.7 |
Segment profit (loss) | 207.0 | 31.9 |
Reportable Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment general and administration | 61.6 | 34.7 |
Segment profit (loss) | 207.0 | 31.9 |
Reportable Segments | Motion Pictures |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment revenues | 472.4 | 362.2 |
Gross contribution | 113.8 | 56.3 |
Segment general and administration | 26.9 | 24.5 |
Segment profit (loss) | 86.9 | 31.8 |
Reportable Segments | Television Production |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment revenues | 156.6 | 191.1 |
Gross contribution | 21.7 | 17.1 |
Segment general and administration | 9.1 | 7.5 |
Segment profit (loss) | 12.6 | 9.6 |
Reportable Segments | Media Networks |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment revenues | 390.5 | 0.3 |
Gross contribution | 135.1 | (6.8) |
Segment general and administration | 25.6 | 2.7 |
Segment profit (loss) | 109.5 | (9.5) |
Intersegment Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment revenues | (14.2) | 0.0 |
Gross contribution | (2.0) | 0.0 |
Segment profit (loss) | (2.0) | 0.0 |
Intersegment Eliminations | Motion Pictures |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment revenues | (5.1) | 0.0 |
Intersegment Eliminations | Television Production |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment revenues | $ (9.1) | $ 0.0 |

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