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Segment Information (Reconciliation of Total Assets By Segment to Consolidated Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Apr. 01, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | $ 8,580.3 | $ 9,111.2 | $ 8,967.6
Operating segments | Motion Picture |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | 1,774.8 |  | 1,757.4
Operating segments | Television Production |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | 1,476.5 |  | 1,400.5
Operating segments | Media Networks |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets |  | 4,902.5 |  | 5,166.5
Other unallocated assets |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets | [1] | $ 426.5 |  | $ 643.2
[1] | Other unallocated assets primarily consist of cash, other assets and investments.

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