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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 913.7	$ 933.2	$ 901.0	$ 932.7	$ 1,040.2	$ 1,142.7	$ 940.8	$ 1,005.3	$ 3,680.5	$ 4,129.1	$ 3,201.5
Operating segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues									1,464.4	1,822.1	1,920.6
Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenues									215.8	281.4	371.3
Operating segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenues									334.7	373.7	303.9
Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues									257.5	400.3	403.8
Operating segments | Motion Picture | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues									592.2	774.0	707.7
Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenues									274.4	278.5	279.1
Operating segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenues									341.1	456.7	533.8
Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenues									40.9	31.5	28.7
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues									920.9	1,033.2	892.8
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues									66.9	96.3	50.1
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues									7.6	11.2	6.3
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues									74.5	107.5	56.4
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues									136.0	179.6	163.2
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues									54.6	1.6	5.9
Operating segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenues									655.8	744.5	667.3
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues									1,461.0	1,411.2	426.3
Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues									1,461.0	1,411.2	426.3
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(165.8)	(137.4)	(38.2)
Intersegment Eliminations | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues									(10.9)	(10.7)	(6.6)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues									(154.8)	(126.4)	(30.7)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues									(0.1)	(0.3)	(0.9)
International | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues									2.1	0.0	0.0
Domestic
Disaggregation of Revenue [Line Items]
Revenues									3,124.6	3,383.0	2,431.9
Domestic | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues									1,458.9	1,411.2	426.3
Domestic | Operating segments | Media Networks | Streaming Services
Disaggregation of Revenue [Line Items]
Revenues									$ 18.0	$ 7.1	$ 2.9

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