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Segment Information (Segment Information) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			3
Segment revenues	$ 885.4	$ 836.4	$ 2,674.4	$ 2,395.0
Gross contribution	166.4	215.7	553.7	717.0
Segment general and administration	53.0	58.5	163.6	176.6
Segment profit	113.4	157.2	390.1	540.4
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	53.0	58.5	163.6	176.6
Segment profit	113.4	157.2	390.1	540.4
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	275.3	250.3	897.3	788.6
Gross contribution	90.2	76.2	283.3	313.9
Segment general and administration	22.7	26.2	69.8	79.8
Segment profit	67.5	50.0	213.5	234.1
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	438.6	228.2	1,160.8	621.0
Gross contribution	28.6	39.0	79.6	105.8
Segment general and administration	9.3	9.5	28.8	31.5
Segment profit	19.3	29.5	50.8	74.3
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	388.9	406.2	1,155.9	1,161.7
Gross contribution	49.5	104.5	187.1	311.6
Segment general and administration	21.0	22.8	65.0	65.3
Segment profit	28.5	81.7	122.1	246.3
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(217.4)	(48.3)	(539.6)	(176.3)
Gross contribution	(1.9)	(4.0)	3.7	(14.3)
Segment profit	(1.9)	(4.0)	3.7	(14.3)
Intersegment Eliminations | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	(28.2)	(6.5)	(35.4)	(16.7)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues	(189.2)	(41.8)	(504.2)	(159.6)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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