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Financial Instruments (Forward Contracts Effect on Statement of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Total direct operating expense on consolidated statements of operations		$ 2,028.2	$ 2,309.6	$ 1,903.8
Total interest expense on consolidated statements of operations	[1]	163.6	137.2	99.7
Direct operating | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in direct operating expense		0.0	0.1	0.0
Foreign Exchange Contracts | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive income (loss)		1.1	(0.2)	(3.5)
Gain (loss) reclassified from accumulated other comprehensive income (loss) into direct operating expense		0.0	(1.5)	5.0
Interest Rate Swap | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive income (loss)		(71.3)	0.0	0.0
Loss reclassified from accumulated other comprehensive income (loss) into interest expense		$ (7.7)	$ 0.0	$ 0.0
[1] Represents interest expense before interest on dissenting shareholders' liability.

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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.

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