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Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | $ 2,740.8 | $ 2,700.5
Business acquisitions | [1] | 92.0 | 29.0
Measurement period adjustments | [2] | 0.7 | 11.3
Balance, end of period |  | 2,833.5 | 2,740.8
Motion Picture |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | 393.7 | 361.9
Business acquisitions | [1] | 0.0 | 29.0
Measurement period adjustments | [2] | 0.0 | 2.8
Balance, end of period |  | 393.7 | 393.7
Television Production |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | 309.2 | 309.2
Business acquisitions | [1] | 92.0 | 0.0
Measurement period adjustments | [2] | 0.7 | 0.0
Balance, end of period |  | 401.9 | 309.2
Media Networks |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | 2,037.9 | 2,029.4
Business acquisitions | [1] | 0.0 | 0.0
Measurement period adjustments | [2] | 0.0 | 8.5
Balance, end of period |  | $ 2,037.9 | $ 2,037.9
[1] | In fiscal 2019 and 2018, represents the goodwill resulting from the acquisitions of 3 Arts Entertainment and Good Universe, respectively (see Note 2).
[2] | In fiscal 2019, represents measurement period adjustments resulting from the acquisition of 3 Arts Entertainment (see Note 2), consisting of a decrease to the fair value of finite-lived intangible assets and a corresponding increase to goodwill. In fiscal 2018, represents measurement period adjustments related to the Starz Merger.

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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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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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