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Employee Benefit Plans - Schedule of recognized in accumulated other comprehensive loss (Details) - USD ($)	May 31, 2025	May 31, 2024
Pension and postretirement adjustments:
Actuarial gain (loss)	$ (9,600,000)	$ (10,300,000)
Prior service credit (cost)	5,900,000	6,700,000
Amount recognized in Accumulated comprehensive income (loss) net of tax	(5,500,000)	(5,600,000)
U.K. | Pension Plans
Pension and postretirement adjustments:
Actuarial gain (loss)	(11,000,000.0)	(11,800,000)
Prior service credit (cost)	0.0	0.0
Amount recognized in Accumulated comprehensive income (loss) net of tax	(11,000,000.0)	(11,800,000)
United States | Other Postretirement Benefits
Pension and postretirement adjustments:
Actuarial gain (loss)	1,400,000	1,500,000
Prior service credit (cost)	5,900,000	6,700,000
Amount recognized in Accumulated comprehensive income (loss) net of tax	$ 5,500,000	$ 6,200,000

X

- Definition

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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Amount, before tax, of accumulated other comprehensive (income) loss for 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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