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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, 2020	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total direct operating expense on consolidated statements of operations	$ 2,226.1	$ 2,028.2	$ 2,309.6
Total interest expense on consolidated statements of operations	191.3	163.6	137.2
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive income (loss)	0.8	1.1	(0.2)
Gain (loss) reclassified from accumulated other comprehensive income (loss)	1.6	0.0	(1.5)
Gain recognized in direct operating expense	(0.4)	0.0	0.1
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive income (loss)	(138.6)	(71.3)	0.0
Gain (loss) reclassified from accumulated other comprehensive income (loss)	$ (14.3)	$ (7.7)	$ 0.0

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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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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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