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Segment Information (Reconciliation of Total Assets By Segment to Consolidated Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 8,967.6 | $ 9,196.9
Operating segments | Motion Pictures |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,757.4 | 1,802.3
Operating segments | Television Production |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,400.5 | 1,364.0
Operating segments | Media Networks |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 5,166.5 | 5,236.8
Other unallocated assets |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 643.2 | $ 793.8

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