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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-Average Assumptions |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Year ended May 31,
﻿ |  |  | 2017 |  |  |  | 2017 |  | 2016 |  | 2015
﻿ |  | Performance stock options |  | Stock options
﻿Risk-free interest rate |  |  | 1.3 | % |  |  |  | 1.2 | % |  |  | 1.9 | % |  |  | 2.1 | %
﻿Dividend yield |  |  | 3.6 | % |  |  |  | 3.6 | % |  |  | 3.6 | % |  |  | 3.7 | %
﻿Volatility factor |  |  | 0.18 |  |  |  |  | 0.18 |  |  |  | 0.18 |  |  |  | 0.21 |
﻿Expected option life in years |  |  | 6.5 |  |  |  |  | 6.1 |  |  |  | 6.1 |  |  |  | 6.0 |
﻿Weighted-average grant-date fair value of stock options granted (per share) |  | $ | 5.97 |  |  |  | $ | 5.74 |  |  | $ | 5.25 |  |  | $ | 5.68 |
﻿
Stock Option Activity |
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﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  | 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, 2016 |  | 4.5 |  | $ | 37.42 |  |  |  |  |
﻿Granted |  | 0.7 |  | $ | 60.82 |  |  |  |  |
﻿Exercised |  | (0.9) |  | $ | 34.26 |  |  |  |  |
﻿Forfeited |  | (0.1) |  | $ | 45.95 |  |  |  |  |
﻿Expired |  | — |  | $ | 36.01 |  |  |  |  |
﻿Outstanding as of May 31, 2017 |  | 4.2 |  | $ | 42.02 |  | 6.3 |  | $ | 73.4
﻿Exercisable as of May 31, 2017 |  | 2.5 |  | $ | 35.80 |  | 5.1 |  | $ | 58.1
﻿
| (1) |  | Market price of the underlying stock as of May 31, 2017 less the exercise price.
﻿
Other Information Pertaining to Stock Option |
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﻿ |  | Year ended May 31,
﻿In millions |  | 2017 |  | 2016 |  | 2015
﻿Total intrinsic value of stock options exercised |  | $ | 23.8 |  | $ | 14.5 |  | $ | 17.6
﻿Total grant-date fair value of stock options vested |  | $ | 4.1 |  | $ | 4.0 |  | $ | 3.6
﻿
RSU Activity |
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﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  | Weighted- |  |  |
﻿ |  |  |  | Weighted- |  | average |  |  |
﻿ |  |  |  | average |  | remaining |  |  |
﻿ |  |  |  | grant-date |  | vesting |  | Aggregate
﻿ |  |  |  | fair value |  | period |  | intrinsic
﻿In millions, except per share amounts |  | RSUs |  | per share |  | (years) |  | value(1)
﻿Nonvested as of May 31, 2016 |  | 1.8 |  | $ | 37.58 |  |  |  |  |
﻿Granted |  | 0.6 |  | $ | 53.76 |  |  |  |  |
﻿Vested |  | (0.6) |  | $ | 35.43 |  |  |  |  |
﻿Forfeited |  | (0.2) |  | $ | 42.23 |  |  |  |  |
﻿Nonvested as of May 31, 2017 |  | 1.6 |  | $ | 43.53 |  | 2.9 |  | $ | 97.2
﻿
| (1) |  | Intrinsic value for RSUs is based on the market price of the underlying stock as of May 31, 2017.
﻿
Other Information Pertaining to RSUs |
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﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year ended May 31,
﻿In millions, except per share amounts |  | 2017 |  | 2016 |  | 2015
﻿Weighted-average grant-date fair value per share of RSUs granted |  | $ | 53.76 |  | $ | 42.60 |  | $ | 36.64
﻿Total intrinsic value of RSUs vested |  | $ | 32.3 |  | $ | 25.9 |  | $ | 21.7
﻿Total grant-date fair value of RSUs vested |  | $ | 19.3 |  | $ | 17.3 |  | $ | 14.8
﻿
Restricted Stock Activity |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ |  |  |  | Weighted-
﻿ |  |  |  | average
﻿ |  |  |  | grant-date
﻿ |  | Restricted |  | fair value
﻿In millions, except per share amounts |  | shares |  | per share
﻿Nonvested as of May 31, 2016 |  | 0.1 |  | $ | 43.99
﻿Granted |  | 0.1 |  | $ | 60.83
﻿Vested |  | (0.1) |  | $ | 42.87
﻿Forfeited |  | — |  | $ | 48.61
﻿Nonvested as of May 31, 2017 |  | 0.1 |  | $ | 53.05
﻿
Other Information Pertaining to Restricted Stock |
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﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year ended May 31,
﻿In millions, except per share amounts |  | 2017 |  | 2016 |  | 2015
﻿Weighted-average grant-date fair value per share of restricted stock granted |  | $ | 60.83 |  | $ | 47.46 |  | $ | 41.70
﻿Total grant-date fair value of restricted stock vested |  | $ | 3.0 |  | $ | 3.0 |  | $ | 3.5
﻿
Performance Share Activity | ﻿
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ |  |  |  | Weighted-
﻿ |  |  |  | average
﻿ |  |  |  | grant-date
﻿ |  | Performance |  | fair value
﻿In millions, except per share amounts |  | shares |  | per share
﻿Nonvested as of May 31, 2016 |  | 0.5 |  | $ | 38.89
﻿Granted (1) |  | 0.1 |  | $ | 54.97
﻿Vested |  | (0.2) |  | $ | 35.69
﻿Forfeited |  | — |  | $ | 40.99
﻿Nonvested as of May 31, 2017 |  | 0.4 |  | $ | 45.66
﻿
| (1) |  | Performance shares granted assuming achievement of performance goals at target. Actual amount of shares to be earned may differ from this amount.
Other Information Pertaining to Performance Shares |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year ended May 31,
﻿In millions, except per share amounts |  | 2017 |  | 2016 |  | 2015
﻿Weighted-average grant-date fair value per share of performance shares granted |  | $ | 54.97 |  | $ | 42.48 |  | $ | 37.61
﻿Total grant-date fair value of performance shares vested |  | $ | 7.8 |  | $ | 5.9 |  | $ | 3.5
﻿
Performance Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Option Activity |
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﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  | 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, 2016 |  | 2.5 |  | $ | 31.36 |  |  |  |  |
﻿Granted(2) |  | 1.3 |  | $ | 60.89 |  |  |  |  |
﻿Exercised |  | (0.4) |  | $ | 30.65 |  |  |  |  |
﻿Forfeited |  | (1.0) |  | $ | 31.30 |  |  |  |  |
﻿Expired |  | — |  | $ | — |  |  |  |  |
﻿Outstanding as of May 31, 2017 |  | 2.4 |  | $ | 47.52 |  | 6.9 |  | $ | 30.3
﻿Exercisable as of May 31, 2017 |  | 1.1 |  | $ | 31.69 |  | 4.3 |  | $ | 30.3
﻿
| (1) |  | Market price of the underlying stock as of May 31, 2017 less the exercise price.
| (2) |  | LTIP performance stock options granted assumes achievement of performance goals at target. Actual amount of shares to be earned may differ from this amount.
Other Information Pertaining to Stock Option |
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﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year ended May 31,
﻿In millions |  | 2017 |  | 2016 |  | 2015
﻿Total intrinsic value of stock options exercised |  | $ | 12.4 |  | $ | 1.0 |  | $ | 2.7
﻿Total grant-date fair value of stock options vested |  | $ | 4.9 |  | $ | — |  | $ | 2.6
﻿
Performance-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted Stock Activity | ﻿
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ |  |  |  | Weighted-
﻿ |  |  |  | average
﻿ |  |  |  | grant-date
﻿ |  | Restricted |  | fair value
﻿In millions, except per share amounts |  | shares |  | per share
﻿Nonvested as of May 31, 2016 |  | — |  | $ | —
﻿Granted(1) |  | 0.2 |  | $ | 53.74
﻿Vested |  | — |  | $ | —
﻿Forfeited |  | — |  | $ | —
﻿Nonvested as of May 31, 2017 |  | 0.2 |  | $ | 53.74
| (1) |  | LTIP performance shares granted assumes achievement of performance goals at target. Actual amount of shares to be earned may differ from this amount.

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