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Supplemental Information (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2022 | Nov. 30, 2021 | Nov. 30, 2022 | Nov. 30, 2021 | May 31, 2022
Depreciation expense | $ 31.7 | $ 32.5 | $ 63.1 | $ 63.2 |
Amortization expense | 12.6 | 16.1 | 25.2 | 31.1 |
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 | 4.97% |  | 4.97% |  | 2.34%
Standby Letters of Credit [Member] |  |  |  |  |
Maximum borrowing capacity | $ 141.5 |  | $ 141.5 |  | $ 140.2
Amounts outstanding | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Standby Letters of Credit [Member] | Minimum [Member] |  |  |  |  |
Expiration date |  |  | Dec. 05, 2022 |  |
Standby Letters of Credit [Member] | Maximum [Member] |  |  |  |  |
Expiration date |  |  | Nov. 22, 2023 |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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