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Segment Information (Segment Revenues By Media or Product Line) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue from External Customer [Line Items]
Revenues	$ 940.8	$ 639.5	$ 1,946.1	$ 1,193.1
Reportable Segments | Motion Pictures
Revenue from External Customer [Line Items]
Revenues	385.7	464.0	858.0	826.3
Reportable Segments | Motion Pictures | Theatrical
Revenue from External Customer [Line Items]
Revenues	57.9	62.0	108.7	109.2
Reportable Segments | Motion Pictures | Home Entertainment
Revenue from External Customer [Line Items]
Revenues	165.7	157.1	399.7	300.4
Reportable Segments | Motion Pictures | Television
Revenue from External Customer [Line Items]
Revenues	74.2	69.3	131.8	122.7
Reportable Segments | Motion Pictures | International
Revenue from External Customer [Line Items]
Revenues	79.9	168.3	202.3	282.0
Reportable Segments | Motion Pictures | Other
Revenue from External Customer [Line Items]
Revenues	8.0	7.3	15.5	12.0
Reportable Segments | Television Production
Revenue from External Customer [Line Items]
Revenues	168.7	175.1	325.4	366.2
Reportable Segments | Television Production | Home Entertainment
Revenue from External Customer [Line Items]
Revenues	3.0	3.2	6.5	10.0
Reportable Segments | Television Production | International
Revenue from External Customer [Line Items]
Revenues	29.3	15.9	52.6	43.7
Reportable Segments | Television Production | Other
Revenue from External Customer [Line Items]
Revenues	2.2	1.6	3.9	5.1
Reportable Segments | Television Production | Domestic Television
Revenue from External Customer [Line Items]
Revenues	134.2	154.4	262.4	307.4
Reportable Segments | Media Networks
Revenue from External Customer [Line Items]
Revenues	393.4	0.4	783.9	0.6
Reportable Segments | Media Networks | Starz Networks
Revenue from External Customer [Line Items]
Revenues	358.6	0.0	701.8	0.0
Reportable Segments | Media Networks | Content And Other
Revenue from External Customer [Line Items]
Revenues	33.7	0.0	79.6	0.0
Reportable Segments | Media Networks | Streaming Services
Revenue from External Customer [Line Items]
Revenues	1.1	0.4	2.5	0.6
Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenues	(7.0)	0.0	(21.2)	0.0
Intersegment Eliminations | Motion Pictures
Revenue from External Customer [Line Items]
Revenues	(2.5)	0.0	(5.9)	0.0
Intersegment Eliminations | Television Production
Revenue from External Customer [Line Items]
Revenues	(4.5)	0.0	(15.0)	0.0
Intersegment Eliminations | Media Networks
Revenue from External Customer [Line Items]
Revenues	$ 0.0	$ 0.0	$ (0.3)	$ 0.0

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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