Supplemental Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023	May 31, 2023
Depreciation expense	$ 32.3	$ 32.7	$ 94.7	$ 95.8
Amortization expense	12.5	11.5	36.2	36.7
Impairment loss relates to goodwill or intangible assets			0.0	0.0
Revolving Credit Facility [Member]
Unused amount available	$ 2,000.0		$ 2,000.0
Weighted-average interest rate	6.20%		6.20%		5.83%
Standby Letters of Credit [Member]
Maximum borrowing capacity	$ 170.8		$ 170.8		$ 141.7
Amounts outstanding	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Standby Letters of Credit [Member] \| Minimum [Member]
Expiration date of credit facility			Mar. 03, 2024
Standby Letters of Credit [Member] \| Maximum [Member]
Expiration date of credit facility			Oct. 09, 2025

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482686/350-30-45-2

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-2

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Weighted average interest rate of debt outstanding.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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Date the credit facility terminates, in YYYY-MM-DD format.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.19(b),22(b))
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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