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Segment Information (Segment Revenues By Media or Product Line) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Revenues	$ 1,005.3	$ 553.6
Reportable Segments | Motion Pictures
Revenue from External Customer [Line Items]
Revenues	472.4	362.2
Reportable Segments | Motion Pictures | Theatrical
Revenue from External Customer [Line Items]
Revenues	50.8	47.2
Reportable Segments | Motion Pictures | Home Entertainment
Revenue from External Customer [Line Items]
Revenues	234.0	143.2
Reportable Segments | Motion Pictures | Television
Revenue from External Customer [Line Items]
Revenues	57.7	53.3
Reportable Segments | Motion Pictures | International
Revenue from External Customer [Line Items]
Revenues	122.8	113.8
Reportable Segments | Motion Pictures | Other
Revenue from External Customer [Line Items]
Revenues	7.1	4.7
Reportable Segments | Television Production
Revenue from External Customer [Line Items]
Revenues	156.6	191.1
Reportable Segments | Television Production | Home Entertainment
Revenue from External Customer [Line Items]
Revenues	3.6	6.8
Reportable Segments | Television Production | International
Revenue from External Customer [Line Items]
Revenues	23.0	27.7
Reportable Segments | Television Production | Other
Revenue from External Customer [Line Items]
Revenues	1.8	3.6
Reportable Segments | Television Production | Domestic Television
Revenue from External Customer [Line Items]
Revenues	128.2	153.0
Reportable Segments | Media Networks
Revenue from External Customer [Line Items]
Revenues	390.5	0.3
Reportable Segments | Media Networks | Starz Networks
Revenue from External Customer [Line Items]
Revenues	343.2	0.0
Reportable Segments | Media Networks | Content And Other
Revenue from External Customer [Line Items]
Revenues	45.9	0.0
Reportable Segments | Media Networks | Streaming Services
Revenue from External Customer [Line Items]
Revenues	1.4	0.3
Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenues	(14.2)	0.0
Intersegment Eliminations | Motion Pictures
Revenue from External Customer [Line Items]
Revenues	(5.1)	0.0
Intersegment Eliminations | Television Production
Revenue from External Customer [Line Items]
Revenues	$ (9.1)	$ 0.0

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+ 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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