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Derivative Financial Instruments (Details 1) - Cash Flow Hedging [Member] - Interest rate contracts - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other comprehensive income (loss)	$ (22.7)	$ (48.1)	$ (119.8)	$ (37.6)
Change in accumulated other comprehensive income (loss)	(22.6)	(48.0)	(119.5)	(37.3)
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income (loss) to interest expense	$ (0.1)	$ (0.1)	$ (0.3)	$ (0.3)

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

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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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