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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 944.3	$ 998.5	$ 983.5	$ 963.6	$ 913.7	$ 933.2	$ 901.0	$ 932.7	$ 3,890.0	$ 3,680.5	$ 4,129.1
Operating segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues									1,670.9	1,464.4	1,822.1
Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenues									355.6	215.8	281.4
Operating segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenues									447.9	334.7	373.7
Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues									256.9	257.5	400.3
Operating segments | Motion Picture | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues									704.8	592.2	774.0
Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenues									247.1	274.4	278.5
Operating segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenues									341.0	341.1	456.7
Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenues									22.4	40.9	31.5
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues									1,001.3	920.9	1,033.2
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues									57.4	66.9	96.3
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues									3.4	7.6	11.2
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues									60.8	74.5	107.5
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues									152.7	136.0	179.6
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues									72.1	54.6	1.6
Operating segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenues									715.7	655.8	744.5
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues									1,486.8	1,461.0	1,411.2
Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues									1,486.8	1,461.0	1,411.2
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(269.0)	(165.8)	(137.4)
Intersegment Eliminations | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues									(17.7)	(10.9)	(10.7)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues									(248.9)	(154.8)	(126.4)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues									(2.4)	(0.1)	(0.3)
International | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues									22.9	2.1	0.0
Domestic
Disaggregation of Revenue [Line Items]
Revenues									3,321.9	3,124.6	3,383.0
Domestic | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues									1,463.9	1,458.9	1,411.2
Domestic | Operating segments | Media Networks | Other Streaming Services
Disaggregation of Revenue [Line Items]
Revenues									$ 33.8	$ 18.0	$ 7.1

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Publisher FASB
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