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Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Goodwill [Roll Forward] |  |
Balance, beginning of period | $ 534.8 | $ 323.4
Merger or Acquisition | 2,199.4 | 210.8
Measurement period adjustments | (33.7) | 0.6
Balance, end of period | 2,700.5 | 534.8
Motion Pictures |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 294.4 | 294.4
Merger or Acquisition | 68.4 | 0.0
Measurement period adjustments | (0.9) | 0.0
Balance, end of period | 361.9 | 294.4
Television Production |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 240.4 | 29.0
Merger or Acquisition | 0.0 | 210.8
Measurement period adjustments | 0.0 | 0.6
Balance, end of period | 240.4 | 240.4
Media Networks |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 0.0 | 0.0
Merger or Acquisition | 2,131.0 | 0.0
Measurement period adjustments | (32.8) | 0.0
Balance, end of period | 2,098.2 | $ 0.0
Starz |  |
Goodwill [Roll Forward] |  |
Measurement period adjustments | (33.7) |
Adjustment to accounts receivable | (2.1) |
Adjustment to investments in film and television programs and programming rights | 9.2 |
Adjustment to intangible assets | 50.0 |
Adjustment to accounts payable and accrued liabilities | (16.5) |
Adjustment to corporate debt | 3.4 |
Adjustment to deferred tax liabilities | (17.2) |
Adjustment to other liabilities | 7.0 |
Adjustment to fair value of net assets acquired | $ 33.7 |

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