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Segment Information (Segment Revenues By Media or Product Line) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Revenues	$ 1,142.7	$ 752.3	$ 3,088.8	$ 1,945.4
Reportable Segments | Motion Pictures
Revenue from External Customer [Line Items]
Revenues	539.1	440.4	1,397.0	1,266.5
Reportable Segments | Motion Pictures | Theatrical
Revenue from External Customer [Line Items]
Revenues	109.3	87.4	218.0	196.6
Reportable Segments | Motion Pictures | Home Entertainment
Revenue from External Customer [Line Items]
Revenues	185.3	167.0	584.9	467.4
Reportable Segments | Motion Pictures | Television
Revenue from External Customer [Line Items]
Revenues	85.4	91.3	217.2	213.9
Reportable Segments | Motion Pictures | International
Revenue from External Customer [Line Items]
Revenues	134.4	90.2	336.9	372.3
Reportable Segments | Motion Pictures | Other
Revenue from External Customer [Line Items]
Revenues	24.7	4.5	40.0	16.3
Reportable Segments | Television Production
Revenue from External Customer [Line Items]
Revenues	227.3	228.6	552.8	595.0
Reportable Segments | Television Production | Home Entertainment
Revenue from External Customer [Line Items]
Revenues	20.2	23.3	26.8	33.4
Reportable Segments | Television Production | International
Revenue from External Customer [Line Items]
Revenues	32.2	31.3	84.5	75.1
Reportable Segments | Television Production | Other
Revenue from External Customer [Line Items]
Revenues	1.0	0.5	5.1	5.7
Reportable Segments | Television Production | Domestic Television
Revenue from External Customer [Line Items]
Revenues	173.9	173.5	436.4	480.8
Reportable Segments | Media Networks
Revenue from External Customer [Line Items]
Revenues	382.9	85.2	1,166.8	85.8
Reportable Segments | Media Networks | Starz Networks
Revenue from External Customer [Line Items]
Revenues	351.8	82.8	1,053.7	82.8
Reportable Segments | Media Networks | Content And Other
Revenue from External Customer [Line Items]
Revenues	29.4	1.4	109.0	1.4
Reportable Segments | Media Networks | Streaming Services
Revenue from External Customer [Line Items]
Revenues	1.7	1.0	4.1	1.6
Intersegment Eliminations
Revenue from External Customer [Line Items]
Revenues	(6.6)	(1.9)	(27.8)	(1.9)
Intersegment Eliminations | Motion Pictures
Revenue from External Customer [Line Items]
Revenues	(2.3)	(1.4)	(8.4)	(1.4)
Intersegment Eliminations | Television Production
Revenue from External Customer [Line Items]
Revenues	(3.7)	(0.1)	(18.5)	(0.1)
Intersegment Eliminations | Media Networks
Revenue from External Customer [Line Items]
Revenues	$ (0.6)	$ (0.4)	$ (0.9)	$ (0.4)

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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.

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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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