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Segment Information (Segment Information By Business Unit) (Details) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items] |  |
Number of reportable business segments | segment | 3 |
Segment revenues | $ 932.7 | $ 1,005.3
Gross contribution | 207.4 | 268.6
Segment general and administration | 62.9 | 61.6
Segment profit | 144.5 | 207.0
Reportable Segments |  |
Segment Reporting Information [Line Items] |  |
Segment general and administration | 62.9 | 61.6
Segment profit | 144.5 | 207.0
Reportable Segments | Motion Pictures |  |
Segment Reporting Information [Line Items] |  |
Segment revenues | 365.3 | 472.4
Gross contribution | 78.5 | 113.8
Segment general and administration | 26.9 | 26.9
Segment profit | 51.6 | 86.9
Reportable Segments | Television Production |  |
Segment Reporting Information [Line Items] |  |
Segment revenues | 279.4 | 261.2
Gross contribution | 26.0 | 52.3
Segment general and administration | 10.4 | 9.1
Segment profit | 15.6 | 43.2
Reportable Segments | Media Networks |  |
Segment Reporting Information [Line Items] |  |
Segment revenues | 354.9 | 344.6
Gross contribution | 114.1 | 114.5
Segment general and administration | 25.6 | 25.6
Segment profit | 88.5 | 88.9
Intersegment Eliminations |  |
Segment Reporting Information [Line Items] |  |
Segment revenues | (66.9) | (72.9)
Gross contribution | (11.2) | (12.0)
Segment profit | (11.2) | (12.0)
Intersegment Eliminations | Motion Pictures |  |
Segment Reporting Information [Line Items] |  |
Segment revenues | (2.1) | (5.1)
Intersegment Eliminations | Television Production |  |
Segment Reporting Information [Line Items] |  |
Segment revenues | (64.8) | (67.8)
Intersegment Eliminations | Media Networks |  |
Segment Reporting Information [Line Items] |  |
Segment revenues | $ 0.0 | $ 0.0

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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