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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, 2021 | May 31, 2020 | May 31, 2019
Time-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant-date fair value per share |  | $ 67.92 |  | $ 73.28 | $ 62.20
Weighted-average remaining vesting period (years) |  | 3 years |  | 2 years 10 months 24 days | 2 years 10 months 24 days
Total intrinsic value of RSUs vested |  | $ 32.6 |  | $ 40.0 | $ 1.2
Aggregate intrinsic value of nonvested RSUs | [1] | 152.7 |  | 99.9 | 127.0
Total grant-date fair value of RSUs vested |  | $ 25.6 |  | $ 23.6 | $ 0.8
Performance-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant-date fair value per share | [3] |  | [2] | $ 80.59 |
Weighted-average remaining vesting period (years) | [3] | 1 year 1 month 6 days |  | 2 years 1 month 6 days |
Total intrinsic value of RSUs vested | [3] |  |  |  |
Aggregate intrinsic value of nonvested RSUs | [1],[3] | 6.2 |  | 4.4 |
Total grant-date fair value of RSUs vested | [3] |  |  |  |
[1] | Based on the market price of the underlying common stock as of May 31, 2021, 2020 and 2019.
[2] | 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.
[3] | No performance-based RSUs were granted during fiscal 2021 or fiscal 2019.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&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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