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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 3,271.5	$ 3,890.0	$ 3,680.5
Operating segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	1,081.1	1,670.9	1,464.4
Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenues	12.0	355.6	215.8
Operating segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	461.5	447.9	334.7
Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	139.5	256.9	257.5
Operating segments | Motion Picture | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	601.0	704.8	592.2
Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenues	230.2	247.1	274.4
Operating segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenues	217.0	341.0	341.1
Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenues	20.9	22.4	40.9
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues	831.8	1,001.3	920.9
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	127.1	57.4	66.9
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	5.7	3.4	7.6
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	132.8	60.8	74.5
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues	164.5	152.7	136.0
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues	60.5	72.1	54.6
Operating segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenues	474.0	715.7	655.8
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	1,562.7	1,486.8	1,461.0
Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	1,562.7	1,486.8	1,461.0
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(204.1)	(269.0)	(165.8)
Intersegment Eliminations | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	(19.8)	(17.7)	(10.9)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues	(184.3)	(248.9)	(154.8)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	0.0	(2.4)	(0.1)
International | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	65.5	22.9	2.1
Domestic
Disaggregation of Revenue [Line Items]
Revenues	2,863.3	3,321.9	3,124.6
Domestic | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	1,497.2	1,463.9	1,458.9
Domestic | Operating segments | Media Networks | Other Streaming Services
Disaggregation of Revenue [Line Items]
Revenues	$ 50.3	$ 33.8	$ 18.0

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