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Segment Information (Segment Information By Business Unit) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			3
Segment revenues	$ 1,142.7	$ 752.3	$ 3,088.8	$ 1,945.4
Gross contribution	266.8	151.6	730.7	252.2
Segment general and administration	61.8	40.5	184.9	111.5
Segment profit (loss)	205.0	111.1	545.8	140.7
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration	61.8	40.5	184.9	111.5
Segment profit (loss)	205.0	111.1	545.8	140.7
Reportable Segments | Motion Pictures
Segment Reporting Information [Line Items]
Segment revenues	539.1	440.4	1,397.0	1,266.5
Gross contribution	82.1	79.2	230.9	154.8
Segment general and administration	27.8	25.4	81.1	74.5
Segment profit (loss)	54.3	53.8	149.8	80.3
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	227.3	228.6	552.8	595.0
Gross contribution	31.3	32.3	72.4	69.6
Segment general and administration	8.6	6.7	28.3	22.7
Segment profit (loss)	22.7	25.6	44.1	46.9
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	382.9	85.2	1,166.8	85.8
Gross contribution	153.7	40.5	429.7	28.2
Segment general and administration	25.4	8.4	75.5	14.3
Segment profit (loss)	128.3	32.1	354.2	13.9
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(6.6)	(1.9)	(27.8)	(1.9)
Gross contribution	(0.3)	(0.4)	(2.3)	(0.4)
Segment profit (loss)	(0.3)	(0.4)	(2.3)	(0.4)
Intersegment Eliminations | Motion Pictures
Segment Reporting Information [Line Items]
Segment revenues	(2.3)	(1.4)	(8.4)	(1.4)
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues	(3.7)	(0.1)	(18.5)	(0.1)
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	$ (0.6)	$ (0.4)	$ (0.9)	$ (0.4)

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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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