Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		9 Months Ended
		Jan. 31, 2025	Jan. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance		$ (234.6)
Accumulated Other Comprehensive Income (Loss), Ending Balance		(197.3)
Foreign Currency Translation Adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance		(39.2)	$ (34.3)
Reclassification adjustments		0.0	0.0
Current period credit (charge)		(14.3)	2.4
Income tax benefit (expense)		0.0	0.0
Accumulated Other Comprehensive Income (Loss), Ending Balance		(53.5)	(31.9)
Net Gains (Losses) on Cash Flow Hedging Derivatives [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	[1]	(143.1)	(153.6)
Reclassification adjustments	[1]	66.7	10.1
Current period credit (charge)	[1]	0.0	0.0
Income tax benefit (expense)	[1]	(15.7)	(1.9)
Accumulated Other Comprehensive Income (Loss), Ending Balance	[1]	(92.1)	(145.4)
Pension and Other Postretirement Liabilities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	[2]	(53.4)	(52.7)
Reclassification adjustments	[2]	1.4	4.4
Current period credit (charge)	[2]	0.0	(3.2)
Income tax benefit (expense)	[2]	(0.4)	(0.2)
Accumulated Other Comprehensive Income (Loss), Ending Balance	[2]	(52.4)	(51.7)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance		1.1	1.4
Reclassification adjustments		0.0	0.0
Current period credit (charge)		(0.5)	0.3
Income tax benefit (expense)		0.1	(0.1)
Accumulated Other Comprehensive Income (Loss), Ending Balance		0.7	1.6
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance		(234.6)	(239.2)
Reclassification adjustments		68.1	14.5
Current period credit (charge)		(14.8)	(0.5)
Income tax benefit (expense)		(16.0)	(2.2)
Accumulated Other Comprehensive Income (Loss), Ending Balance		$ (197.3)	$ (227.4)

[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. In addition, a portion of the reclassification in 2025 was reclassified to other debt gains (charges) – net resulting from the extinguishment of debt from the tender offers. For additional information, see Note 11: Derivative Financial Instruments and Note 9: Debt and Financing Arrangements.

[2] The reclassification from accumulated other comprehensive income (loss) to other income (expense) – net is composed of settlement charges and amortization of net losses and prior service costs. For additional information, see Note 10: Pensions and Other Postretirement Benefits.