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Goodwill and Intangible Assets (Goodwill) (Details) $ in Millions	12 Months Ended
	Mar. 31, 2019 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 2,740.8
Business acquisitions	92.0
Measurement period adjustments	0.7
Balance, end of period	2,833.5
Motion Picture
Goodwill [Roll Forward]
Balance, beginning of period	393.7
Business acquisitions	0.0
Measurement period adjustments	0.0
Balance, end of period	393.7
Television Production
Goodwill [Roll Forward]
Balance, beginning of period	309.2
Business acquisitions	92.0
Measurement period adjustments	0.7
Balance, end of period	401.9
Media Networks
Goodwill [Roll Forward]
Balance, beginning of period	2,037.9
Business acquisitions	0.0
Measurement period adjustments	0.0
Balance, end of period	$ 2,037.9

X

- 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

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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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
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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=116868678&loc=d3e961-128460

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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