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Segment Information (Reconciliation of Total Assets By Segment to Consolidated Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Mar. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		$ 7,959.7	$ 8,408.9
Operating segments | Motion Picture
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		1,557.7	1,694.5
Operating segments | Television Production
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		1,336.0	1,394.2
Operating segments | Media Networks
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		4,613.7	4,850.3
Other unallocated assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	[1]	$ 452.3	$ 469.9
[1] Other unallocated assets primarily consist of cash, other assets and investments.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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+ References

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