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Segment Information (Segment Information) (Details) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Revenues	$ 944.3	$ 998.5	$ 983.5	$ 963.6	$ 913.7	$ 933.2	$ 901.0	$ 932.7	$ 3,890.0	$ 3,680.5	$ 4,129.1
Number of reportable business segments | segment									3
Gross contribution									$ 791.5	871.4	968.4
Segment general and administration									229.6	246.8	254.4
Segment profit (loss)									561.9	624.6	714.0
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration									229.6	246.8	254.4
Segment profit (loss)									561.9	624.6	714.0
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Revenues									1,001.3	920.9	1,033.2
Gross contribution									90.7	109.6	151.3
Segment general and administration									37.3	43.5	40.3
Segment profit (loss)									53.4	66.1	111.0
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Revenues									1,486.8	1,461.0	1,411.2
Gross contribution									380.5	534.0	530.0
Segment general and administration									87.5	97.7	100.9
Segment profit (loss)									293.0	436.3	429.1
Direct operating expense benefit from modification of a content licensing arrangement									39.7
Reportable Segments | Motion Picture
Segment Reporting Information [Line Items]
Revenues									1,670.9	1,464.4	1,822.1
Gross contribution									313.5	234.1	292.6
Segment general and administration									104.8	105.6	113.2
Segment profit (loss)									208.7	128.5	179.4
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues									(269.0)	(165.8)	(137.4)
Gross contribution									6.8	(6.3)	(5.5)
Segment profit (loss)									6.8	(6.3)	(5.5)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Revenues									(248.9)	(154.8)	(126.4)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Revenues									(2.4)	(0.1)	(0.3)
Intersegment Eliminations | Motion Picture
Segment Reporting Information [Line Items]
Revenues									$ (17.7)	$ (10.9)	$ (10.7)

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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