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Segment Information (Segment Information) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			3
Direct operating expenses		$ 4.6		$ 41.3
Segment revenues	$ 836.4	998.5	$ 2,395.0	2,945.7
Gross contribution	215.7	204.8	717.0	575.1
Segment general and administration	58.5	57.4	176.6	165.7
Segment profit	157.2	147.4	540.4	409.4
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	58.5	57.4	176.6	165.7
Segment profit	157.2	147.4	540.4	409.4
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	250.3	473.9	788.6	1,277.6
Gross contribution	76.2	74.0	313.9	183.7
Segment general and administration	26.2	25.0	79.8	76.1
Segment profit	50.0	49.0	234.1	107.6
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	228.2	189.4	621.0	743.2
Gross contribution	39.0	4.4	105.8	58.8
Segment general and administration	9.5	10.1	31.5	26.9
Segment profit	29.5	(5.7)	74.3	31.9
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	406.2	382.4	1,161.7	1,128.8
Gross contribution	104.5	124.4	311.6	330.0
Segment general and administration	22.8	22.3	65.3	62.7
Segment profit	81.7	102.1	246.3	267.3
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(48.3)	(47.2)	(176.3)	(203.9)
Gross contribution	(4.0)	2.0	(14.3)	2.6
Segment profit	(4.0)	2.0	(14.3)	2.6
Intersegment Eliminations | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	(6.5)	(3.8)	(16.7)	(13.9)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues	(41.8)	(42.8)	(159.6)	(188.2)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	$ 0.0	$ (0.6)	$ 0.0	$ (1.8)

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