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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 963.6	$ 932.7
Operating segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	397.8	365.3
Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenues	121.8	50.3
Operating segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	83.3	86.2
Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	56.4	76.5
Operating segments | Motion Picture | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	139.7	162.7
Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenues	64.8	61.8
Operating segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenues	67.4	67.3
Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenues	4.1	23.2
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues	279.8	279.4
Operating segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenues	196.8	217.7
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	5.9	16.3
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	1.4	1.8
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	7.3	18.1
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues	56.7	37.0
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues	19.0	6.6
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	372.4	354.9
Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	372.4	354.9
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(86.4)	(66.9)
Intersegment Eliminations | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	(4.4)	(2.1)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues	(81.4)	(64.8)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	(0.6)	0.0
Domestic | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	369.3	354.8
Domestic | Operating segments | Media Networks | Streaming Services
Disaggregation of Revenue [Line Items]
Revenues	6.4	3.7
International | Operating segments | Media Networks | Programming
Disaggregation of Revenue [Line Items]
Revenues	$ 3.1	$ 0.1

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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