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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, 2020 | May 31, 2019 | May 31, 2018
Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant-date fair value per share |  | $ 73.28 | $ 62.20 | $ 51.15
Weighted-average remaining vesting period (years) |  | 2 years 10 months 24 days | 2 years 10 months 24 days | 3 years 2 months 12 days
Total intrinsic value of RSUs vested |  | $ 40.0 | $ 1.2 | $ 60.9
Aggregate intrinsic value of nonvested RSUs | [1] | 99.9 | 127.0 | 69.2
Total grant-date fair value of RSUs vested |  | $ 23.6 | $ 0.8 | $ 42.4
Performance-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant-date fair value per share | [2],[3] | $ 80.59 |  |
Weighted-average remaining vesting period (years) | [3] | 2 years 1 month 6 days |  |
Aggregate intrinsic value of nonvested RSUs | [1],[3] | $ 4.4 |  |
[1] | Based on the market price of the underlying common stock as of May 31, 2020, 2019 and 2018.
[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 2019 and fiscal 2018.

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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=116856206&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=116856206&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=116856206&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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