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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 901.0	$ 940.8	$ 1,833.6	$ 1,946.1
Operating segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	379.0	385.7	744.3	858.0
Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenues	69.1	57.9	119.5	108.7
Operating segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	85.1	90.4	171.3	192.0
Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	64.5	75.3	141.0	207.7
Operating segments | Motion Picture | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	149.6	165.7	312.3	399.7
Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenues	70.9	74.2	132.8	131.8
Operating segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenues	82.2	79.9	149.6	202.3
Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenues	7.2	8.0	30.1	15.5
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues	152.1	211.2	431.5	472.4
Operating segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenues	85.1	143.3	302.9	330.7
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	27.0	25.1	43.3	66.7
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	1.6	4.8	3.4	5.8
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	28.6	29.9	46.7	72.5
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues	21.8	36.8	58.8	68.1
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues	16.6	1.2	23.1	1.1
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	377.3	359.7	732.2	704.3
Operating segments | Media Networks | Starz Networks - programming revenues
Disaggregation of Revenue [Line Items]
Revenues	373.7	358.6	724.9	701.8
Operating segments | Media Networks | Streaming Services - programming revenues
Disaggregation of Revenue [Line Items]
Revenues	3.6	1.1	7.3	2.5
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(7.4)	(15.8)	(74.4)	(88.6)
Intersegment Eliminations | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	(2.2)	(2.5)	(4.3)	(5.9)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues	(5.2)	(13.3)	(70.0)	(82.4)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 0.0	$ (0.1)	$ (0.3)

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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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