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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 998.5	$ 933.2	$ 2,945.7	$ 2,766.9
Operating segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	473.9	362.6	1,277.6	1,106.9
Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenues	109.0	28.5	316.5	147.9
Operating segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	115.5	81.7	312.1	253.0
Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	75.4	68.0	197.0	209.0
Operating segments | Motion Picture | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	190.9	149.7	509.1	462.0
Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenues	74.5	74.8	177.7	207.6
Operating segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenues	96.1	104.7	256.6	254.3
Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenues	3.4	4.9	17.7	35.1
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues	189.4	216.5	743.2	648.1
Operating segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenues	144.2	151.5	526.4	454.4
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	10.0	10.9	47.6	54.1
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	0.6	2.5	2.2	5.9
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	10.6	13.4	49.8	60.0
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues	17.4	35.9	113.3	94.7
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues	17.2	15.7	53.7	39.0
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	382.4	366.8	1,128.8	1,099.0
Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues			1,128.8	1,099.0
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(47.2)	(12.7)	(203.9)	(87.1)
Intersegment Eliminations | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	(3.8)	(3.2)	(13.9)	(7.6)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues	(42.8)	(9.5)	(188.2)	(79.4)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	(0.6)	0.0	(1.8)	(0.1)
Domestic | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	376.3	366.2	1,115.2	1,098.1
Domestic | Operating segments | Media Networks | Streaming Services
Disaggregation of Revenue [Line Items]
Revenues	8.7	4.7	22.8	12.0
International | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	$ 6.1	$ 0.6	$ 13.6	$ 0.9

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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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