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Segment Information (Segment Information) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			3
Segment revenues	$ 998.5	$ 933.2	$ 2,945.7	$ 2,766.9
Gross contribution	204.8	257.8	575.1	681.0
Segment general and administration	57.4	60.2	165.7	184.8
Segment profit	147.4	197.6	409.4	496.2
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	57.4	60.2	165.7	184.8
Segment profit	147.4	197.6	409.4	496.2
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	473.9	362.6	1,277.6	1,106.9
Gross contribution	74.0	69.2	183.7	186.3
Segment general and administration	25.0	25.7	76.1	78.6
Segment profit	49.0	43.5	107.6	107.7
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	189.4	216.5	743.2	648.1
Gross contribution	4.4	32.6	58.8	79.4
Segment general and administration	10.1	11.4	26.9	32.9
Segment profit	(5.7)	21.2	31.9	46.5
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	382.4	366.8	1,128.8	1,099.0
Gross contribution	124.4	157.2	330.0	418.7
Segment general and administration	22.3	23.1	62.7	73.3
Segment profit	102.1	134.1	267.3	345.4
Direct operating expense benefit from modification of content licensing agreement	4.6		41.3
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(47.2)	(12.7)	(203.9)	(87.1)
Gross contribution	2.0	(1.2)	2.6	(3.4)
Segment profit	2.0	(1.2)	2.6	(3.4)
Intersegment Eliminations | Motion Picture
Segment Reporting Information [Line Items]
Segment revenues	(3.8)	(3.2)	(13.9)	(7.6)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues	(42.8)	(9.5)	(188.2)	(79.4)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	$ (0.6)	$ 0.0	$ (1.8)	$ (0.1)

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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