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Stock-Based Compensation Plans (Other Information Pertaining to RSUs) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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May 31, 2023 | May 31, 2022 | May 31, 2021
Time-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant-date fair value per share |  | $ 127.75 | [1] | $ 109.81 | $ 67.92
Weighted-average remaining vesting period (years) | [2] | 1 year 6 months |  | 1 year 6 months | 1 year 7 months 6 days
Total intrinsic value of RSUs vested |  | $ 58.2 |  | $ 54.7 | $ 32.6
Aggregate intrinsic value of nonvested RSUs | [3] | 141.8 |  | 165.2 | 152.7
Total grant-date fair value of RSUs vested |  | $ 32.7 |  | $ 30.0 | $ 25.6
Performance-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant-date fair value per share | [4] | $ 108.31 | [1] | $ 103.59 | $ 0
Weighted-average remaining vesting period (years) | [2],[4] | 1 year 9 months 18 days |  | 1 year | 1 year 1 month 6 days
Total intrinsic value of RSUs vested | [4] | $ 7.8 |  |  |
Aggregate intrinsic value of nonvested RSUs | [3],[4] | 15.7 |  | $ 14.7 | $ 6.2
Total grant-date fair value of RSUs vested | [4] | $ 5.4 |  |  |
[1] | For performance-based RSUs, granted number assumes achievement of performance goals at target. Actual number of shares to be earned may differ from this amount.
[2] | Weighting is based on the number of unvested share units vesting in each future vesting tranche.
[3] | Based on the market price of the underlying common stock as of May 31, 2023, 2022 and 2021.
[4] | No performance-based RSUs were granted during fiscal 2021.

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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