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Segment Information (Segment Information) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment	3
Segment revenues	$ 813.7	$ 963.6
Gross contribution	260.1	146.8
Segment general and administration	60.0	55.3
Segment profit	200.1	91.5
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	60.0	55.3
Segment profit	200.1	91.5
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	280.7	397.8
Gross contribution	129.9	32.9
Segment general and administration	28.8	25.3
Segment profit	101.1	7.6
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	195.7	279.8
Gross contribution	45.6	34.7
Segment general and administration	10.7	9.7
Segment profit	34.9	25.0
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	367.3	372.4
Gross contribution	92.3	80.9
Segment general and administration	20.5	20.3
Segment profit	71.8	60.6
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(30.0)	(86.4)
Gross contribution	(7.7)	(1.7)
Segment profit	(7.7)	(1.7)
Intersegment Eliminations | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	(3.1)	(4.4)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues	(26.9)	(81.4)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	$ 0.0	$ (0.6)

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