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Segment Information (Segment Information By Business Unit) (Details) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment									3	2
Segment revenues	$ 1,256.1	$ 752.3	$ 639.5	$ 553.6	$ 791.2	$ 670.5	$ 476.8	$ 408.9	$ 3,201.5	$ 2,347.4	$ 2,399.6
Gross contribution									510.1	276.7	492.3
Segment general and administration									182.4	120.7	103.4
Segment profit (loss)									327.7	156.0	388.9
Reportable Segments
Segment Reporting Information [Line Items]
Segment general and administration									182.4	120.7	103.4
Segment profit (loss)									327.7	156.0	388.9
Reportable Segments | Motion Pictures
Segment Reporting Information [Line Items]
Segment revenues									1,920.6	1,677.4	1,820.1
Gross contribution									237.8	183.2	437.2
Segment general and administration									105.3	92.4	87.8
Segment profit (loss)									132.5	90.8	349.4
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues									837.4	669.9	579.5
Gross contribution									91.9	98.7	55.1
Segment general and administration									32.1	23.5	15.6
Segment profit (loss)									59.8	75.2	39.5
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues									456.6	0.1	0.0
Gross contribution									183.6	(5.2)	0.0
Segment general and administration									45.0	4.8	0.0
Segment profit (loss)									138.6	(10.0)	0.0
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues									(13.1)	0.0	0.0
Gross contribution									(3.2)	0.0	0.0
Segment profit (loss)									(3.2)	0.0	0.0
Intersegment Eliminations | Motion Pictures
Segment Reporting Information [Line Items]
Segment revenues									(6.6)	0.0	0.0
Intersegment Eliminations | Television Production
Segment Reporting Information [Line Items]
Segment revenues									(5.6)	0.0	0.0
Intersegment Eliminations | Media Networks
Segment Reporting Information [Line Items]
Segment revenues									$ (0.9)	$ 0.0	$ 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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