Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		6 Months Ended
		Oct. 31, 2025	Oct. 31, 2024	Jul. 31, 2025	Apr. 30, 2025	Jul. 31, 2024	Apr. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance		$ (184.5)
Accumulated Other Comprehensive Income (Loss), Ending Balance		(182.7)
Stockholders' Equity Attributable to Parent		6,060.2	$ 7,633.1	$ 5,925.9	$ 6,082.6	$ 7,769.5	$ 7,693.9
Foreign Currency Translation Adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification adjustments		0.0	0.0
Current period credit (charge)		(4.3)	(10.7)
Income tax benefit (expense)		0.0	0.0
Stockholders' Equity Attributable to Parent		(46.0)	(49.9)		(41.7)		(39.2)
Net Gains (Losses) on Cash Flow Hedging Derivatives [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification adjustments	[1]	6.3	6.8
Current period credit (charge)	[1]	0.0	0.0
Income tax benefit (expense)	[1]	(1.5)	(1.6)
Stockholders' Equity Attributable to Parent	[1]	(85.3)	(137.9)		(90.1)		(143.1)
Pension and Other Postretirement Liabilities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification adjustments	[2]	0.9	1.0
Current period credit (charge)	[2]	0.0	0.0
Income tax benefit (expense)	[2]	(0.3)	(0.3)
Stockholders' Equity Attributable to Parent	[2]	(52.6)	(52.7)		(53.2)		(53.4)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification adjustments		0.0	0.0
Current period credit (charge)		0.9	0.5
Income tax benefit (expense)		(0.2)	(0.1)
Stockholders' Equity Attributable to Parent		1.2	1.5		0.5		1.1
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification adjustments		7.2	7.8
Current period credit (charge)		(3.4)	(10.2)
Income tax benefit (expense)		(2.0)	(2.0)
Stockholders' Equity Attributable to Parent		$ (182.7)	$ (239.0)	$ (182.5)	$ (184.5)	$ (232.2)	$ (234.6)

[1] The reclassification from accumulated other comprehensive income (loss) is primarily composed of deferred gains (losses) related to terminated interest rate contracts which were reclassified to interest expense – net. For additional information, see Note 9: Derivative Financial Instruments.

[2] The reclassification from accumulated other comprehensive income (loss) to other income (expense) – net is composed of amortization of net losses and prior service costs. For additional information, see Note 8: Pensions and Other Postretirement Benefits.