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Segment Information (Segment Information) (Details) $ in Millions	12 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Revenues	$ 3,271.5	$ 3,890.0	$ 3,680.5
Number of reportable business segments | segment	3
Gross contribution	$ 897.4	791.5	871.4
Segment general and administration	242.8	229.6	246.8
Segment profit (loss)	654.6	561.9	624.6
Direct operating expense benefit from modification of a content licensing arrangement		39.7
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	242.8	229.6	246.8
Segment profit (loss)	654.6	561.9	624.6
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Revenues	831.8	1,001.3	920.9
Gross contribution	126.3	90.7	109.6
Segment general and administration	42.7	37.3	43.5
Segment profit (loss)	83.6	53.4	66.1
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Revenues	1,562.7	1,486.8	1,461.0
Gross contribution	383.4	380.5	534.0
Segment general and administration	93.9	87.5	97.7
Segment profit (loss)	289.5	293.0	436.3
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Revenues	1,081.1	1,670.9	1,464.4
Gross contribution	401.8	313.5	234.1
Segment general and administration	106.2	104.8	105.6
Segment profit (loss)	295.6	208.7	128.5
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(204.1)	(269.0)	(165.8)
Gross contribution	(14.1)	6.8	(6.3)
Segment profit (loss)	(14.1)	6.8	(6.3)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Revenues	(184.3)	(248.9)	(154.8)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Revenues	0.0	(2.4)	(0.1)
Intersegment Eliminations | Motion Picture
Segment Reporting Information [Line Items]
Revenues	$ (19.8)	$ (17.7)	$ (10.9)

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