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Segment Information (Reconciliation of Total Assets By Segment to Consolidated Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Mar. 31, 2017
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Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | $ 8,700.6 | $ 9,196.9
Operating segments | Motion Pictures |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 1,702.8 | 1,802.3
Operating segments | Television Production |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 1,138.2 | 1,142.8
Operating segments | Media Networks |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 5,295.8 | 5,443.9
Other unallocated assets |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | [1] | $ 563.8 | $ 807.9
[1] | Other unallocated assets primarily consist of cash, other assets and investments.

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