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Segment Information (Segment Information By Business Unit) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($) segment
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			3	2
Segment revenues	$ 940.8	$ 639.5	$ 1,946.1	$ 1,193.1
Gross contribution	195.3	33.9	463.9	100.6
Segment general and administration	61.4	36.1	123.1	71.0
Segment profit (loss)	133.9	(2.2)	340.8	29.6
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	61.4	36.1	123.1	71.0
Segment profit (loss)	133.9	(2.2)	340.8	29.6
Reportable Segments | Motion Pictures
Segment Reporting Information [Line Items]
Segment revenues	385.7	464.0	858.0	826.3
Gross contribution	35.2	19.5	149.1	75.9
Segment general and administration	26.3	24.5	53.2	49.1
Segment profit (loss)	8.9	(5.0)	95.9	26.8
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	168.7	175.1	325.4	366.2
Gross contribution	19.2	19.9	40.7	37.1
Segment general and administration	10.6	8.4	19.7	16.0
Segment profit (loss)	8.6	11.5	21.0	21.1
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	393.4	0.4	783.9	0.6
Gross contribution	141.0	(5.5)	276.1	(12.4)
Segment general and administration	24.5	3.2	50.2	5.9
Segment profit (loss)	116.5	(8.7)	225.9	(18.3)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(7.0)	0.0	(21.2)	0.0
Gross contribution	(0.1)	0.0	(2.0)	0.0
Segment profit (loss)	(0.1)	0.0	(2.0)	0.0
Intersegment Eliminations | Motion Pictures
Segment Reporting Information [Line Items]
Segment revenues	(2.5)	0.0	(5.9)	0.0
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues	(4.5)	0.0	(15.0)	0.0
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	$ 0.0	$ 0.0	$ (0.3)	$ 0.0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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