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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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May 31, 2021
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-Average Assumptions |
| Year ended May 31,
| 2021 |  | 2020 |  | 2019
| Stock options
Risk-free interest rate |  | 0.5 | % |  |  | 2.0 | % |  |  | 2.9 | %
Dividend yield |  | 3.2 | % |  |  | 3.3 | % |  |  | 3.5 | %
Volatility factor |  | 0.29 |  |  |  | 0.18 |  |  |  | 0.18 |
Expected option life in years |  | 6.1 |  |  |  | 6.2 |  |  |  | 6.1 |
Weighted-average grant-date ‎ fair value of stock options granted (per share) | $ | 13.52 |  |  | $ | 9.86 |  |  | $ | 8.87 |
Stock Option Activity |
|  |  |  |  |  |  | Weighted- |  |  |
|  |  |  | Weighted- |  | average |  |  |
|  | Shares |  | average |  | remaining |  | Aggregate
|  | subject |  | exercise price |  | contractual |  | intrinsic
In millions, except per share amounts |  | to options |  | per share |  | term (years) |  | value(1)
Outstanding as of May 31, 2020 |  | 4.4 |  | $ | 55.02 |  |  |  |  |
Granted |  | 0.7 |  | $ | 73.55 |  |  |  |  |
Exercised |  | (1.4) |  | $ | 42.66 |  |  |  |  |
Forfeited |  | (0.1) |  | $ | 78.69 |  |  |  |  |
Expired |  | — |  | $ | 36.79 |  |  |  |  |
Outstanding as of May 31, 2021 |  | 3.6 |  | $ | 62.89 |  | 6.2 |  | $ | 136.8
Exercisable as of May 31, 2021 |  | 2.4 |  | $ | 56.25 |  | 5.0 |  | $ | 108.0
(1)Total shares valued at the market price of the underlying stock as of May 31, 2021 less the exercise price.
Other Information Pertaining to Stock Option |
|  | Year ended May 31,
In millions |  | 2021 |  | 2020 |  | 2019
Total intrinsic value of stock options exercised |  | $ | 58.5 |  | $ | 22.0 |  | $ | 25.7
Total grant-date fair value of stock options vested |  | $ | 6.0 |  | $ | 5.0 |  | $ | 4.3
Performance Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-Average Assumptions |
|  |  |  |  | Year ended May 31,
|  |  |  |  | 2019
|  |  |  |  | Performance-based
|  |  |  |  | stock options
Risk-free interest rate |  |  |  |  |  | 2.9 | %
Dividend yield |  |  |  |  |  | 3.5 | %
Volatility factor |  |  |  |  |  | 0.18 |
Expected option life in years |  |  |  |  |  | 6.5 |
Weighted-average grant-date ‎ fair value of stock options granted (per share) |  |  |  |  | $ | 9.02 |
Time Based And Performance Based Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Activity |
|  |  |  | Weighted- |  |  |  | Weighted-
|  |  |  | average |  |  |  | average
|  | Time- |  | grant-date |  | Performance- |  | grant-date
|  | Based |  | fair value |  | based |  | fair value
In millions, except per share amounts |  | RSUs |  | per share |  | RSUs |  | per share
Nonvested as of May 31, 2020 |  | 1.4 |  | $ | 61.60 |  | 0.1 |  | $ | 80.59
Granted (1) |  | 0.7 |  | $ | 67.92 |  | — |  | $ | —
Vested |  | (0.5) |  | $ | 57.10 |  | — |  | $ | —
Forfeited |  | (0.1) |  | $ | 64.40 |  | — |  | $ | —
Nonvested as of May 31, 2021 |  | 1.5 |  | $ | 65.64 |  | 0.1 |  | $ | 80.59
(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.
Other Information Pertaining to RSUs |
|  | Year ended May 31,
In millions, except per share amounts |  | 2021 |  | 2020 |  | 2019
Time-based RSUs: |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share of RSUs granted |  | $ | 67.92 |  | $ | 73.28 |  | $ | 62.20
Weighted-average remaining vesting period (years) |  |  | 3.0 |  |  | 2.9 |  |  | 2.9
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(2): |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share of RSUs granted |  | $ | — |  | $ | 80.59 |  | $ | —
Weighted-average remaining vesting period (years) |  |  | 1.1 |  |  | 2.1 |  |  | —
Total intrinsic value of RSUs vested |  | $ | — |  | $ | — |  | $ | —
Aggregate intrinsic value of nonvested RSUs (1) |  | $ | 6.2 |  | $ | 4.4 |  | $ | —
Total grant-date fair value of RSUs vested |  | $ | — |  | $ | — |  | $ | —
(1)Based on the market price of the underlying common stock as of May 31, 2021, 2020 and 2019. (2)No performance-based RSUs were granted during fiscal 2021 or fiscal 2019.
Time-Based And Performance-Based Restricted Stock Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Awards Activity |
|  |  |  | Weighted- |  |  |  | Weighted-
|  |  |  | average |  |  |  | average
|  |  |  | grant-date |  | Performance- |  | grant-date
|  | Time-based |  | fair value |  | based |  | fair value
In millions, except per share amounts |  | shares |  | per share |  | shares |  | per share
Nonvested as of May 31, 2020 |  | 0.1 |  | $ | 73.20 |  | 0.3 |  | $ | 61.97
Granted (1) |  | 0.1 |  | $ | 73.93 |  | — |  | $ | 65.17
Vested |  | (0.1) |  | $ | 70.11 |  | (0.2) |  | $ | 54.28
Forfeited |  | — |  | $ | 76.45 |  | — |  | $ | 72.31
Nonvested as of May 31, 2021 |  | 0.1 |  | $ | 74.60 |  | 0.1 |  | $ | 69.28
(1)For performance-based shares, granted number assumes achievement of performance goals at target. Actual number of shares to be earned may differ from this amount.
Other Information Pertaining to Restricted Stock Awards |
|  | Year ended May 31,
In millions, except per share amounts |  | 2021 |  | 2020 |  | 2019
Weighted-average grant-date fair value per share of time-based shares granted |  | $ | 73.93 |  | $ | 84.46 |  | $ | 69.80
Total grant-date fair value of time-based restricted stock vested |  | $ | 3.0 |  | $ | 3.2 |  | $ | 3.0
Weighted-average grant-date fair value per share of performance-based shares granted |  | $ | 65.17 |  | $ | 80.59 |  | $ | 65.17
Total grant-date fair value of performance-based restricted stock vested |  | $ | 8.4 |  | $ | 5.8 |  | $ | 5.3
LTIP Performance-Based Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Option Activity |
|  |  |  |  |  |  | Weighted- |  |  |
|  |  |  | Weighted- |  | average |  |  |
|  | Shares |  | average |  | remaining |  | Aggregate
|  | subject |  | exercise price |  | contractual |  | intrinsic
In millions, except per share amounts |  | to options |  | per share |  | term (years) |  | value(1)
Outstanding as of May 31, 2020 |  | 1.3 |  | $ | 56.13 |  |  |  |  |
Granted(2) |  | 0.2 |  | $ | 60.92 |  |  |  |  |
Exercised |  | (0.8) |  | $ | 53.34 |  |  |  |  |
Outstanding as of May 31, 2021 |  | 0.7 |  | $ | 60.71 |  | 5.0 |  | $ | 27.8
Exercisable as of May 31, 2021 |  | 0.7 |  | $ | 60.71 |  | 5.0 |  | $ | 27.8
(1)Shares valued at the market price of the underlying stock as of May 31, 2021 less the exercise price. (2)Shares issued above target achievement level upon final performance measurement.
Other Information Pertaining to Stock Option |
|  | Year ended May 31,
In millions |  | 2021 |  | 2020 |  | 2019
Total intrinsic value of stock options exercised |  | $ | 26.3 |  | $ | 23.0 |  | $ | 8.2
LTIP Performance-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Awards Activity |
|  |  |  | Weighted-
|  |  |  | average grant
|  | Restricted |  | date fair value
In millions, except per share amounts |  | shares |  | per share
Nonvested as of May 31, 2020 |  | 0.1 |  | $ | 53.97
Granted |  | — |  | $ | 53.97
Exercised |  | (0.1) |  | $ | 53.97
Nonvested as of May 31, 2021 |  | — |  | $ | —

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