Pensions and Other Postretirement Benefits (Details 1) - USD ($) $ in Millions	12 Months Ended
Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2024
Defined Benefit Pension Plans
Other changes in plan assets and benefit liabilities recognized in accumulated other comprehensive loss before income taxes:
Prior service credit (cost) arising during the year	$ 0.0	$ (0.3)	$ 0.0
Net actuarial gain (loss) arising during the year	11.3	1.3	(6.6)
Amortization of prior service cost (credit)	0.2	0.1	0.1
Amortization of net actuarial loss (gain)	3.9	4.3	3.5
Curtailment loss (gain)	0.0	0.0	(1.2)
Settlement loss (gain)	34.4	0.0	0.0
Foreign currency translation	0.0	0.0	0.0
Net change for year	49.8	5.4	(4.2)
Other Postretirement Benefits
Other changes in plan assets and benefit liabilities recognized in accumulated other comprehensive loss before income taxes:
Prior service credit (cost) arising during the year	0.0	0.0	0.0
Net actuarial gain (loss) arising during the year	0.9	(2.3)	5.4
Amortization of prior service cost (credit)	(0.6)	(0.6)	(0.6)
Amortization of net actuarial loss (gain)	(1.9)	(2.0)	(1.5)
Curtailment loss (gain)	0.0	0.0	0.0
Settlement loss (gain)	0.0	0.0	0.0
Foreign currency translation	0.0	0.0	(0.1)
Net change for year	$ (1.6)	$ (4.9)	$ 3.2

Before tax amount of gains and losses due to settlements recognized as a component of net periodic benefit cost.

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Before tax amount of the gain (loss) adjustment to other comprehensive income (loss) resulting from the curtailment of the entity's defined benefit pension and other postretirement benefit plans.

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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