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Goodwill (Details) $ in Millions | 9 Months Ended
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Dec. 31, 2018 USD ($)
Goodwill [Roll Forward] |  |
Balance as of March 31, 2018 | $ 2,740.8 |
Business acquisitions | 92.0 | [1]
Measurement period adjustments | 0.7 | [1]
Balance as of December 31, 2018 | 2,833.5 |
Motion Picture |  |
Goodwill [Roll Forward] |  |
Balance as of March 31, 2018 | 393.7 |
Business acquisitions | 0.0 | [1]
Measurement period adjustments | 0.0 | [1]
Balance as of December 31, 2018 | 393.7 |
Television Production |  |
Goodwill [Roll Forward] |  |
Balance as of March 31, 2018 | 309.2 |
Business acquisitions | 92.0 | [1]
Measurement period adjustments | 0.7 | [1]
Balance as of December 31, 2018 | 401.9 |
Media Networks |  |
Goodwill [Roll Forward] |  |
Balance as of March 31, 2018 | 2,037.9 |
Business acquisitions | 0.0 | [1]
Measurement period adjustments | 0.0 | [1]
Balance as of December 31, 2018 | $ 2,037.9 |
[1] | Represents the goodwill and measurement period adjustments resulting from the acquisition of 3 Arts Entertainment (see Note 2). Measurement period adjustments represented a decrease to the fair value of finite-lived intangible assets and a corresponding increase to goodwill.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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