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Employee Benefit Plans - Schedule of accumulated benefit obligation in excess of plan assets (Details) - U.K. - Pension Plans - USD ($) $ in Millions	May 31, 2023	May 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations	$ 25.1	$ 31.9
Accumulated benefit obligations	25.0	31.6
Fair value of plan assets	$ 19.6	$ 30.4

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

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-Topic 715
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-Name Accounting Standards Codification
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-3

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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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-Section 50
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