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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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May 31, 2020
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-Average Assumptions |
| Year ended May 31,
| 2020 |  | 2019 |  | 2018
| Stock options
Risk-free interest rate |  | 2.0 | % |  |  | 2.9 | % |  |  | 2.1 | %
Dividend yield |  | 3.3 | % |  |  | 3.5 | % |  |  | 3.4 | %
Volatility factor |  | 0.18 |  |  |  | 0.18 |  |  |  | 0.17 |
Expected option life in years |  | 6.2 |  |  |  | 6.1 |  |  |  | 6.1 |
Weighted-average grant-date ‎ fair value of stock options granted (per share) | $ | 9.86 |  |  | $ | 8.87 |  |  | $ | 6.47 |
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, 2019 |  | 4.3 |  | $ | 49.23 |  |  |  |  |
Granted |  | 0.6 |  | $ | 85.22 |  |  |  |  |
Exercised |  | (0.5) |  | $ | 44.24 |  |  |  |  |
Forfeited |  | — |  | $ | 72.17 |  |  |  |  |
Expired |  | — |  | $ | 33.34 |  |  |  |  |
Outstanding as of May 31, 2020 |  | 4.4 |  | $ | 55.02 |  | 5.6 |  | $ | 83.7
Exercisable as of May 31, 2020 |  | 3.1 |  | $ | 46.73 |  | 4.5 |  | $ | 78.1
(1)Total shares valued at the market price of the underlying stock as of May 31, 2020 less the exercise price.
Other Information Pertaining to Stock Option |
|  | Year ended May 31,
In millions |  | 2020 |  | 2019 |  | 2018
Total intrinsic value of stock options exercised |  | $ | 22.0 |  | $ | 25.7 |  | $ | 9.1
Total grant-date fair value of stock options vested |  | $ | 5.0 |  | $ | 4.3 |  | $ | 4.0
Performance Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-Average Assumptions |
|  |  |  |  | Year ended May 31,
|  |  |  |  | 2019 |  | 2018
|  |  |  |  | Performance-based stock options
Risk-free interest rate |  |  |  |  |  | 2.9 | % |  |  | 2.4 | %
Dividend yield |  |  |  |  |  | 3.5 | % |  |  | 3.3 | %
Volatility factor |  |  |  |  |  | 0.18 |  |  |  | 0.18 |
Expected option life in years |  |  |  |  |  | 6.5 |  |  |  | 6.5 |
Weighted-average grant-date ‎ fair value of stock options granted (per share) |  |  |  |  | $ | 9.02 |  |  | $ | 7.45 |
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, 2019 |  | 1.5 |  | $ | 53.45 |  | — |  | $ | —
Granted (1) |  | 0.5 |  | $ | 73.28 |  | 0.1 |  | $ | 80.59
Vested |  | (0.5) |  | $ | 49.49 |  | — |  | $ | —
Forfeited |  | (0.1) |  | $ | 60.26 |  | — |  | $ | —
Nonvested as of May 31, 2020 |  | 1.4 |  | $ | 61.60 |  | 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 |  | 2020 |  | 2019 |  | 2018
Time-based RSUs: |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share of RSUs granted |  | $ | 73.28 |  | $ | 62.20 |  | $ | 51.15
Weighted-average remaining vesting period (years) |  |  | 2.9 |  |  | 2.9 |  |  | 3.2
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(2): |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share of RSUs granted |  | $ | 80.59 |  | $ | — |  | $ | —
Weighted-average remaining vesting period (years) |  |  | 2.1 |  |  | — |  |  | —
Total intrinsic value of RSUs vested |  | $ | — |  | $ | — |  | $ | —
Aggregate intrinsic value of nonvested RSUs (1) |  | $ | 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, 2020, 2019 and 2018. (2)No performance-based RSUs were granted during fiscal 2019 and fiscal 2018.
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, 2019 |  | 0.1 |  | $ | 64.32 |  | 0.4 |  | $ | 58.09
Granted (1) |  | 0.1 |  | $ | 84.46 |  | — |  | $ | 80.59
Vested |  | (0.1) |  | $ | 63.63 |  | (0.1) |  | $ | 56.97
Forfeited |  | — |  | $ | 73.82 |  | — |  | $ | 63.07
Nonvested as of May 31, 2020 |  | 0.1 |  | $ | 73.20 |  | 0.3 |  | $ | 61.97
(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 |  | 2020 |  | 2019 |  | 2018
Weighted-average grant-date fair value per share of time-based shares granted |  | $ | 84.46 |  | $ | 69.80 |  | $ | 57.50
Total grant-date fair value of time-based restricted stock vested |  | $ | 3.2 |  | $ | 3.0 |  | $ | 3.0
Weighted-average grant-date fair value per share of performance-based shares granted |  | $ | 80.59 |  | $ | 65.17 |  | $ | 53.08
Total grant-date fair value of performance-based restricted stock vested |  | $ | 5.8 |  | $ | 5.3 |  | $ | 6.6
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, 2019 |  | 1.9 |  | $ | 51.09 |  |  |  |  |
Granted |  | — |  | $ | — |  |  |  |  |
Exercised |  | (0.5) |  | $ | 31.35 |  |  |  |  |
Forfeited |  | (0.1) |  | $ | 63.17 |  |  |  |  |
Expired |  | — |  | $ | — |  |  |  |  |
Outstanding as of May 31, 2020 |  | 1.3 |  | $ | 56.13 |  | 5.3 |  | $ | 21.8
Exercisable as of May 31, 2020 |  | 0.2 |  | $ | 31.63 |  | 1.1 |  | $ | 9.0
(1)Shares valued at the market price of the underlying stock as of May 31, 2020 less the exercise price.
Other Information Pertaining to Stock Option |
|  | Year ended May 31,
In millions |  | 2020 |  | 2019 |  | 2018
Total intrinsic value of stock options exercised |  | $ | 23.0 |  | $ | 8.2 |  | $ | 7.9
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, 2019 |  | 0.2 |  | $ | 54.31
Granted |  | — |  | $ | —
Exercised |  | — |  | $ | —
Forfeited |  | (0.1) |  | $ | 56.97
Expired |  | — |  | $ | —
Nonvested as of May 31, 2020 |  | 0.1 |  | $ | 53.97

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