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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 933.2	$ 1,142.7	$ 2,766.9	$ 3,088.8
Operating segments | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	362.6	539.1	1,106.9	1,397.0
Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Revenues	28.5	117.4	147.9	226.1
Operating segments | Motion Picture | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	81.7	85.0	253.0	277.1
Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	68.0	104.0	209.0	311.5
Operating segments | Motion Picture | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	149.7	189.0	462.0	588.6
Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Revenues	74.8	90.5	207.6	222.3
Operating segments | Motion Picture | International
Disaggregation of Revenue [Line Items]
Revenues	104.7	134.4	254.3	336.9
Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Revenues	4.9	7.8	35.1	23.1
Operating segments | Television Production
Disaggregation of Revenue [Line Items]
Revenues	216.5	266.2	648.1	738.7
Operating segments | Television Production | Television
Disaggregation of Revenue [Line Items]
Revenues	151.5	184.6	454.4	515.5
Operating segments | Television Production | Digital Media
Disaggregation of Revenue [Line Items]
Revenues	10.9	25.7	54.1	92.4
Operating segments | Television Production | Packaged Media
Disaggregation of Revenue [Line Items]
Revenues	2.5	4.1	5.9	10.0
Operating segments | Television Production | Home Entertainment
Disaggregation of Revenue [Line Items]
Revenues	13.4	29.8	60.0	102.4
Operating segments | Television Production | International
Disaggregation of Revenue [Line Items]
Revenues	35.9	51.1	94.7	118.8
Operating segments | Television Production | Other
Disaggregation of Revenue [Line Items]
Revenues	15.7	0.7	39.0	2.0
Operating segments | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	366.8	353.5	1,099.0	1,057.8
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(12.7)	(16.1)	(87.1)	(104.7)
Intersegment Eliminations | Motion Picture
Disaggregation of Revenue [Line Items]
Revenues	(3.2)	(2.3)	(7.6)	(8.4)
Intersegment Eliminations | Television Production
Disaggregation of Revenue [Line Items]
Revenues	(9.5)	(13.2)	(79.4)	(95.4)
Intersegment Eliminations | Media Networks
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	(0.6)	$ (0.1)	(0.9)
Revenues | Operating segments | Motion Picture | Theatrical
Disaggregation of Revenue [Line Items]
Prior period reclassification adjustment		8.1		8.1
Revenues | Operating segments | Motion Picture | Packaged Media
Disaggregation of Revenue [Line Items]
Prior period reclassification adjustment		3.7		3.7
Revenues | Operating segments | Motion Picture | Television
Disaggregation of Revenue [Line Items]
Prior period reclassification adjustment		5.1		5.1
Revenues | Operating segments | Motion Picture | Other
Disaggregation of Revenue [Line Items]
Prior period reclassification adjustment		$ (16.9)		$ (16.9)

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