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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 745.0	$ 983.5	$ 1,558.7	$ 1,947.1
Operating segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	257.6	405.8	538.3	803.6
Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenues	0.0	85.7	0.3	207.5
Operating segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	116.1	113.3	243.9	196.6
Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	33.9	65.2	73.5	121.6
Operating segments | Motion Picture | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	150.0	178.5	317.4	318.2
Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenues	59.1	38.3	117.6	103.1
Operating segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenues	45.5	93.2	97.9	160.6
Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenues	3.0	10.1	5.1	14.2
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues	197.2	274.0	392.9	553.8
Operating segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenues	116.7	185.5	212.6	382.3
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	15.9	31.7	61.8	37.5
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	1.1	0.2	1.8	1.6
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	17.0	31.9	63.6	39.1
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues	47.9	39.0	94.3	95.8
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues	15.6	17.6	22.4	36.6
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	388.3	374.0	755.5	746.4
Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	388.3	374.0	755.5	746.4
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(98.1)	(70.3)	(128.0)	(156.7)
Intersegment Eliminations | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	(7.1)	(5.7)	(10.2)	(10.1)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues	(91.0)	(64.0)	(117.8)	(145.4)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	0.0	(0.6)	0.0	(1.2)
Domestic | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	374.1	369.6	731.3	738.9
Domestic | Operating segments | Media Networks | Other Streaming Services
Disaggregation of Revenue [Line Items]
Revenues	13.3	7.7	24.8	14.1
International | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	$ 14.2	$ 4.4	$ 24.2	$ 7.5

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