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Note 12 - Equity Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Stock Option |  |  | Restricted Stock |  |  | PSU |
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |  |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
|  |  |  |  |  |  |  |  |  | (in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2020 |  |  | 5,611,777 |  |  | $ | 98.28 |  |  | $ | 613.4 |  |  |  | 390,054 |  |  | $ | 131.63 |  |  |  | 145,609 |  |  | $ | 170.75 |
Granted |  |  | 748,936 |  |  | $ | 189.26 |  |  |  |  |  |  |  | 155,500 |  |  | $ | 188.74 |  |  |  | 59,144 |  |  | $ | 210.07 |
Dividend reinvestment |  |  | — |  |  | $ | — |  |  |  |  |  |  |  | — |  |  | $ | — |  |  |  | 773 |  |  |  | N/A |
Exercised or lapsed |  |  | (572,213 | ) |  | $ | 78.63 |  |  | $ | 60.4 |  |  |  | (165,065 | ) |  | $ | 121.03 |  |  |  | (42,610 | ) |  | $ | 140.70 |
Canceled, expired or forfeited |  |  | (129,363 | ) |  | $ | 153.70 |  |  |  |  |  |  |  | (23,890 | ) |  | $ | 156.44 |  |  |  | — |  |  |  |  |
Outstanding at September 30, 2021 |  |  | 5,659,137 |  |  | $ | 111.03 |  |  | $ | 505.0 |  |  |  | 356,599 |  |  | $ | 159.62 |  |  |  | 162,916 |  |  | $ | 192.99 |
Exercisable at September 30, 2021 |  |  | 3,765,059 |  |  | $ | 86.31 |  |  | $ | 429.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable at December 31, 2020 |  |  | 3,494,164 |  |  | $ | 76.84 |  |  | $ | 456.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested at September 30, 2021 |  |  | 1,894,078 |  |  |  |  |  |  |  |  |  |  |  | 356,599 |  |  |  |  |  |  |  | 162,916 |  |  |  |  |
Expected to vest at September 30, 2021 |  |  | 1,681,038 |  |  |  |  |  |  |  |  |  |  |  | 319,534 |  |  |  |  |  |  |  | 135,055 | (1) |  |  |  |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2021 |  |  | 2020 |
Option pricing model |  |  | Black-Scholes |  |  |  | Black-Scholes |
Expected volatility |  |  | 23.66 | % |  |  | 18.41 | %
Risk-free interest rate |  |  | 0.39 | % |  |  | 1.53 | %
Expected term in years |  |  | 4.3 |  |  |  | 4.3 |
Dividend yield |  |  | 0.63 | % |  |  | 0.71 | %
Weighted average grant date fair value per stock option |  | $ | 35.14 |  |  | $ | 25.77 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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