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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 932.7	$ 1,005.3
Operating segments | Motion Pictures
Disaggregation of Revenue [Line Items]
Revenues	365.3	472.4
Operating segments | Motion Pictures | Theatrical
Disaggregation of Revenue [Line Items]
Revenues	50.3	50.8
Operating segments | Motion Pictures | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	86.2	101.5
Operating segments | Motion Pictures | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	76.5	132.5
Operating segments | Motion Pictures | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	162.7	234.0
Operating segments | Motion Pictures | Television
Disaggregation of Revenue [Line Items]
Revenues	61.8	57.7
Operating segments | Motion Pictures | International
Disaggregation of Revenue [Line Items]
Revenues	67.3	122.8
Operating segments | Motion Pictures | Other
Disaggregation of Revenue [Line Items]
Revenues	23.2	7.1
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues	279.4	261.2
Operating segments | Television Production | Domestic Television
Disaggregation of Revenue [Line Items]
Revenues	217.7	187.5
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	16.3	41.6
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	1.8	1.1
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	18.1	42.7
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues	37.0	30.9
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues	6.6	0.1
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	354.9	344.6
Operating segments | Media Networks | Starz Networks - subscription revenues
Disaggregation of Revenue [Line Items]
Revenues	351.2	343.2
Operating segments | Media Networks | Streaming Services - subscription revenues
Disaggregation of Revenue [Line Items]
Revenues	3.7	1.4
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(66.9)	(72.9)
Intersegment Eliminations | Motion Pictures
Disaggregation of Revenue [Line Items]
Revenues	(2.1)	(5.1)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues	(64.8)	(67.8)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 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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