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Segment Information (Segment Information By Business Unit) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($) segment | Mar. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable business segments | segment |  |  |  |  |  |  |  |  | 3 | 2 |
Segment revenues | $ 1,256.1 | $ 752.3 | $ 639.5 | $ 553.6 | $ 791.2 | $ 670.5 | $ 476.8 | $ 408.9 | $ 3,201.5 | $ 2,347.4 | $ 2,399.6
Gross contribution |  |  |  |  |  |  |  |  | 510.1 | 276.7 | 492.3
Segment general and administration |  |  |  |  |  |  |  |  | 182.4 | 120.7 | 103.4
Segment profit (loss) |  |  |  |  |  |  |  |  | 327.7 | 156.0 | 388.9
Reportable Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment general and administration |  |  |  |  |  |  |  |  | 182.4 | 120.7 | 103.4
Segment profit (loss) |  |  |  |  |  |  |  |  | 327.7 | 156.0 | 388.9
Reportable Segments | Motion Pictures |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 1,920.6 | 1,677.4 | 1,820.1
Gross contribution |  |  |  |  |  |  |  |  | 237.8 | 183.2 | 437.2
Segment general and administration |  |  |  |  |  |  |  |  | 105.3 | 92.4 | 87.8
Segment profit (loss) |  |  |  |  |  |  |  |  | 132.5 | 90.8 | 349.4
Reportable Segments | Television Production |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 837.4 | 669.9 | 579.5
Gross contribution |  |  |  |  |  |  |  |  | 91.9 | 98.7 | 55.1
Segment general and administration |  |  |  |  |  |  |  |  | 32.1 | 23.5 | 15.6
Segment profit (loss) |  |  |  |  |  |  |  |  | 59.8 | 75.2 | 39.5
Reportable Segments | Media Networks |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 456.6 | 0.1 | 0.0
Gross contribution |  |  |  |  |  |  |  |  | 183.6 | (5.2) | 0.0
Segment general and administration |  |  |  |  |  |  |  |  | 45.0 | 4.8 | 0.0
Segment profit (loss) |  |  |  |  |  |  |  |  | 138.6 | (10.0) | 0.0
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | (13.1) | 0.0 | 0.0
Gross contribution |  |  |  |  |  |  |  |  | (3.2) | 0.0 | 0.0
Segment profit (loss) |  |  |  |  |  |  |  |  | (3.2) | 0.0 | 0.0
Intersegment Eliminations | Motion Pictures |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | (6.6) | 0.0 | 0.0
Intersegment Eliminations | Television Production |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | (5.6) | 0.0 | 0.0
Intersegment Eliminations | Media Networks |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | $ (0.9) | $ 0.0 | $ 0.0

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