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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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