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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 836.4	$ 998.5	$ 2,395.0	$ 2,945.7
Operating segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	250.3	473.9	788.6	1,277.6
Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenues	1.8	109.0	2.1	316.5
Operating segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	123.1	115.5	367.0	312.1
Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	36.4	75.4	109.8	197.0
Operating segments | Motion Picture | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	159.5	190.9	476.8	509.1
Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenues	36.2	74.5	153.9	177.7
Operating segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenues	48.0	96.1	146.0	256.6
Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenues	4.8	3.4	9.8	17.7
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues	228.2	189.4	621.0	743.2
Operating segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenues	119.7	144.2	332.3	526.4
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	58.0	10.0	119.8	47.6
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	3.1	0.6	4.9	2.2
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	61.1	10.6	124.7	49.8
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues	26.0	17.4	120.4	113.3
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues	21.4	17.2	43.6	53.7
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	406.2	382.4	1,161.7	1,128.8
Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	406.2	382.4	1,161.7	1,128.8
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(48.3)	(47.2)	(176.3)	(203.9)
Intersegment Eliminations | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	(6.5)	(3.8)	(16.7)	(13.9)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues	(41.8)	(42.8)	(159.6)	(188.2)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	0.0	(0.6)	0.0	(1.8)
Domestic | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	388.5	376.3	1,119.8	1,115.2
Domestic | Operating segments | Media Networks | Other Streaming Services
Disaggregation of Revenue [Line Items]
Revenues	13.2	8.7	38.0	22.8
International | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	$ 17.7	$ 6.1	$ 41.9	$ 13.6

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