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Capital Stock and Stock-Based Awards - Schedule of Intrinsic value of stock options exercised, pretax stock-based compensation cost and related tax benefits (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Share-Based Payment Arrangement [Abstract]
Total intrinsic value of stock options exercised	$ 8.2	$ 5.1	$ 0.1
Total stock-based compensation cost (pretax)	10.5	7.8	6.6
Tax benefits (shortfalls) related to stock-based compensation cost	$ (7.8)	$ 2.3	$ (3.7)
Weighted average grant date fair value per option (in Dollars per share)	$ 11.62	$ 8.04	$ 3.80

X

- Definition

The estimated fair value of stock options granted.

+ References

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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