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Derivative Instruments and Hedging Activities (Forward Contracts Effect on Statement of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Direct operating cost		$ 463.2	$ 521.6	$ 993.2	$ 1,076.4
Interest Expense, Before Interest On Dissenters' Liability	[1]	38.8	34.8	74.2	73.8
Direct operating | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized fair value gain (loss) on foreign exchange contracts that did not qualify as effective hedge contracts		0.0	0.2	(0.7)	0.2
Forward exchange contracts | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized fair value gain (loss) on foreign exchange contracts, effective portion		0.4	(0.8)	0.4	(0.1)
Foreign currency cash flow hedge gain (loss) reclassified to earnings		0.1	0.0	0.2	0.0
Interest rate swap agreements | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized fair value gain (loss) on foreign exchange contracts, effective portion		12.2	0.0	5.4	0.0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net		$ (2.9)	$ 0.0	$ (3.9)	$ 0.0
[1] Represents interest expense before interest on dissenting shareholders' liability.

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- Definition

The amount of expense recognized that includes amortization of film and television production or acquisition costs, participation and residual expenses, provision for doubtful accounts, and foreign exchange gains and losses. Participation costs represent contingent consideration payable based on the performance of the film to parties associated with the film, including producers, writers, directors or actors, etc. Residuals represent amounts payable to various unions or guilds.

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The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683

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-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

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