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Goodwill (Goodwill) (Details) $ in Millions | 3 Months Ended
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Jun. 30, 2017 USD ($)
Goodwill [Roll Forward] |  |
Balance as of March 31, 2017 | $ 2,700.5 |
Measurement period adjustments for Starz Merger | 4.0 | [1]
Balance as of June 30, 2017 | 2,704.5 |
Motion Pictures |  |
Goodwill [Roll Forward] |  |
Balance as of March 31, 2017 | 361.9 |
Measurement period adjustments for Starz Merger | 4.5 | [1]
Balance as of June 30, 2017 | 366.4 |
Television Production |  |
Goodwill [Roll Forward] |  |
Balance as of March 31, 2017 | 240.4 |
Measurement period adjustments for Starz Merger | 0.0 | [1]
Balance as of June 30, 2017 | 240.4 |
Media Networks |  |
Goodwill [Roll Forward] |  |
Balance as of March 31, 2017 | 2,098.2 |
Measurement period adjustments for Starz Merger | (0.5) | [1]
Balance as of June 30, 2017 | 2,097.7 |
Starz |  |
Goodwill [Roll Forward] |  |
Measurement period adjustments for Starz Merger | 4.0 |
Decrease to deferred tax liabilities | 2.4 |
Increase to other liabilities | (6.4) |
Net decrease of fair value of net assets acquired | $ (4.0) |
[1] | Measurement period adjustments for the Starz Merger include a decrease to deferred tax liabilities of $2.4 million, and an increase to other liabilities assumed of $6.4 million. These adjustments resulted in a net decrease of $4.0 million of the fair value of net assets acquired and an increase of $4.0 million to goodwill.

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