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Segment Information (Segment Information By Business Unit) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			3
Segment revenues	$ 933.2	$ 1,142.7	$ 2,766.9	$ 3,088.8
Gross contribution	257.8	266.8	681.0	730.7
Segment general and administration	60.2	61.8	184.8	184.9
Segment profit	197.6	205.0	496.2	545.8
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	60.2	61.8	184.8	184.9
Segment profit	197.6	205.0	496.2	545.8
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	362.6	539.1	1,106.9	1,397.0
Gross contribution	69.2	82.1	186.3	230.9
Segment general and administration	25.7	27.8	78.6	81.1
Segment profit	43.5	54.3	107.7	149.8
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	216.5	266.2	648.1	738.7
Gross contribution	32.6	36.4	79.4	117.8
Segment general and administration	11.4	8.6	32.9	28.3
Segment profit	21.2	27.8	46.5	89.5
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	366.8	353.5	1,099.0	1,057.8
Gross contribution	157.2	147.8	418.7	390.0
Segment general and administration	23.1	25.4	73.3	75.5
Segment profit	134.1	122.4	345.4	314.5
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(12.7)	(16.1)	(87.1)	(104.7)
Gross contribution	(1.2)	0.5	(3.4)	(8.0)
Segment profit	(1.2)	0.5	(3.4)	(8.0)
Intersegment Eliminations | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	(3.2)	(2.3)	(7.6)	(8.4)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues	(9.5)	(13.2)	(79.4)	(95.4)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	$ 0.0	$ (0.6)	$ (0.1)	$ (0.9)

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