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Segment Information (Segment Information By Business Unit) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable business segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Segment revenues | $ 1,040.2 | $ 1,142.7 | $ 940.8 | $ 1,005.3 | $ 1,256.1 | $ 752.3 | $ 639.5 | $ 553.6 | $ 4,129.1 | $ 3,201.5 | $ 2,347.4
Gross contribution |  |  |  |  |  |  |  |  | 968.4 | 510.1 | 276.7
Segment general and administration |  |  |  |  |  |  |  |  | 254.4 | 182.4 | 120.7
Segment profit (loss) |  |  |  |  |  |  |  |  | 714.0 | 327.7 | 156.0
Reportable Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment general and administration |  |  |  |  |  |  |  |  | 254.4 | 182.4 | 120.7
Segment profit (loss) |  |  |  |  |  |  |  |  | 714.0 | 327.7 | 156.0
Reportable Segments | Motion Pictures |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 1,822.1 | 1,920.6 | 1,677.4
Gross contribution |  |  |  |  |  |  |  |  | 292.6 | 237.8 | 183.2
Segment general and administration |  |  |  |  |  |  |  |  | 113.2 | 105.3 | 92.4
Segment profit (loss) |  |  |  |  |  |  |  |  | 179.4 | 132.5 | 90.8
Reportable Segments | Television Production |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 805.3 | 837.4 | 669.9
Gross contribution |  |  |  |  |  |  |  |  | 107.5 | 91.9 | 98.7
Segment general and administration |  |  |  |  |  |  |  |  | 40.3 | 32.1 | 23.5
Segment profit (loss) |  |  |  |  |  |  |  |  | 67.2 | 59.8 | 75.2
Reportable Segments | Media Networks |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 1,532.5 | 456.6 | 0.1
Gross contribution |  |  |  |  |  |  |  |  | 570.2 | 183.6 | (5.2)
Segment general and administration |  |  |  |  |  |  |  |  | 100.9 | 45.0 | 4.8
Segment profit (loss) |  |  |  |  |  |  |  |  | 469.3 | 138.6 | (10.0)
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | (30.8) | (13.1) | 0.0
Gross contribution |  |  |  |  |  |  |  |  | (1.9) | (3.2) | 0.0
Segment profit (loss) |  |  |  |  |  |  |  |  | (1.9) | (3.2) | 0.0
Intersegment Eliminations | Motion Pictures |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | (10.7) | (6.6) | 0.0
Intersegment Eliminations | Television Production |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | (19.8) | (5.6) | 0.0
Intersegment Eliminations | Media Networks |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | $ (0.3) | $ (0.9) | $ 0.0

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