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Segment Information (Segment Information) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment	3
Segment revenues	$ 901.2	$ 813.7
Gross contribution	199.6	260.1
Segment general and administration	55.5	60.0
Segment profit	144.1	200.1
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	55.5	60.0
Segment profit	144.1	200.1
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	291.2	280.7
Gross contribution	68.7	129.9
Segment general and administration	24.4	28.8
Segment profit	44.3	101.1
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	386.1	195.7
Gross contribution	13.0	45.6
Segment general and administration	10.0	10.7
Segment profit	3.0	34.9
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	382.3	367.3
Gross contribution	109.3	92.3
Segment general and administration	21.1	20.5
Segment profit	88.2	71.8
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(158.4)	(30.0)
Gross contribution	8.6	(7.7)
Segment profit	8.6	(7.7)
Intersegment Eliminations | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	(4.4)	(3.1)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues	(154.0)	(26.9)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	$ 0.0	$ 0.0

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