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Segment Information (Segment Information) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			3
Segment revenues	$ 887.8	$ 745.0	$ 1,789.0	$ 1,558.7
Gross contribution	187.7	241.2	387.3	501.3
Segment general and administration	55.0	58.1	110.5	118.1
Segment profit	132.7	183.1	276.8	383.2
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	55.0	58.1	110.5	118.1
Segment profit	132.7	183.1	276.8	383.2
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	330.9	257.6	622.1	538.3
Gross contribution	124.5	107.8	193.2	237.6
Segment general and administration	22.7	24.8	47.1	53.6
Segment profit	101.8	83.0	146.1	184.0
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	336.0	197.2	722.1	392.9
Gross contribution	38.0	21.2	51.0	66.9
Segment general and administration	9.5	11.3	19.5	22.0
Segment profit	28.5	9.9	31.5	44.9
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	384.7	388.3	767.0	755.5
Gross contribution	28.3	114.9	137.6	207.2
Segment general and administration	22.8	22.0	43.9	42.5
Segment profit	5.5	92.9	93.7	164.7
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(163.8)	(98.1)	(322.2)	(128.0)
Gross contribution	(3.1)	(2.7)	5.5	(10.4)
Segment profit	(3.1)	(2.7)	5.5	(10.4)
Intersegment Eliminations | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	(2.8)	(7.1)	(7.2)	(10.2)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues	(161.0)	(91.0)	(315.0)	(117.8)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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