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Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | $ 2,700.5 | $ 534.8
Business acquisitions | [1] | 29.0 | 2,199.4
Measurement period adjustments | [2] | 11.3 | (33.7)
Balance, end of period |  | 2,740.8 | 2,700.5
Motion Pictures |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | 361.9 | 294.4
Business acquisitions | [1] | 29.0 | 68.4
Measurement period adjustments | [2] | 2.8 | (0.9)
Balance, end of period |  | 393.7 | 361.9
Television Production |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | 240.4 | 240.4
Business acquisitions | [1] | 0.0 | 0.0
Measurement period adjustments | [2] | 0.0 | 0.0
Balance, end of period |  | 240.4 | 240.4
Media Networks |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | 2,098.2 | 0.0
Business acquisitions | [1] | 0.0 | 2,131.0
Measurement period adjustments | [2] | 8.5 | (32.8)
Balance, end of period |  | $ 2,106.7 | $ 2,098.2
[1] | In fiscal 2017, represents the goodwill resulting from the Starz Merger, which was allocated to the Media Networks and Motion Pictures segments based on the estimate of the relative fair value of the businesses included in each segment (see Note 2 and Note 15). In fiscal 2018, represents the goodwill resulting from the acquisition of Good Universe (see Note 2).
[2] | In fiscal 2017 and fiscal 2018, represents measurement period adjustments recorded for the Starz Merger.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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