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Segment Information (Reconciliation of Total Assets By Segment to Consolidated Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Mar. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 8,008.0	$ 7,951.2
Operating segments | Motion Picture
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,255.8	1,266.9
Operating segments | Television Production
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,433.6	1,414.8
Operating segments | Media Networks
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,516.2	4,671.4
Other unallocated assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 802.4	$ 598.1

X

- 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.

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