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Note 12 - Equity Compensation Plans - Summary of Stock Activity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jan. 15, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Outstanding beginning balance, options (in shares) |  |  | 5,611,777 |
Outstanding beginning balance, options, weighted average exercise price (in dollars per share) |  |  | $ 98.28 |
Outstanding, options, aggregate intrinsic value |  |  | $ 505.0 | $ 613.4
Granted, options (in shares) |  | 706,507 | 748,936 |
Granted, options, weighted average exercise price (in dollars per share) |  |  | $ 189.26 |
Dividend reinvestment, options (in shares) |  |  | 0 |
Dividend reinvestment, options, weighted average exercise price (in (in dollars per share) |  |  | $ 0 |
Exercised or lapsed, options (in shares) |  |  | (572,213) |
Exercised or lapsed, options, weighted average exercise price (in dollars per share) |  |  | $ 78.63 |
Exercised or lapsed, options, aggregate intrinsic value |  |  | $ 60.4 |
Canceled, expired or forfeited, option (in shares) |  |  | (129,363) |
Canceled, expired or forfeited, options, weighted average exercise price (in dollars per share) |  |  | $ 153.70 |
Outstanding, option (in shares) |  |  | 5,659,137 |
Outstanding beginning balance, options, weighted average exercise price (in dollars per share) |  |  | $ 111.03 |
Exercisable, options (in shares) |  |  | 3,765,059 | 3,494,164
Exercisable, options, weighted average exercise price (in dollars per share) |  |  | $ 86.31 | $ 76.84
Exercisable, options, aggregate intrinsic value |  |  | $ 429.1 | $ 456.9
Nonvested, options (in shares) |  |  | 1,894,078 |
Expected to vest, options (in shares) |  |  | 1,681,038 |
Restricted Stock [Member] |  |  |  |
Outstanding beginning balance, number of shares (in shares) |  |  | 390,054 |
Outstanding beginning balance, weighted average exercise price (in dollars per share) |  |  | $ 131.63 |
Granted, number of shares (in shares) |  | 134,777 | 155,500 |
Granted, weighted average exercise price (in dollars per share) |  |  | $ 188.74 |
Dividend reinvestment, number of shares (in shares) |  |  | 0 |
Dividend reinvestment (in dollars per share) |  |  | $ 0 |
Exercised or lapsed, number of shares (in shares) |  |  | (165,065) |
Exercised or lapsed, weighted average exercise price (in dollars per share) |  |  | $ 121.03 |
Canceled, expired or forfeited, number of shares (in shares) |  |  | (23,890) |
Canceled, expired or forfeited, weighted average exercise price (in dollars per share) |  |  | $ 156.44 |
Outstanding ending balance, number of shares (in shares) |  |  | 356,599 |
Outstanding ending balance, weighted average exercise price (in dollars per share) |  |  | $ 159.62 |
Nonvested, number of shares (in shares) |  |  | 356,599 | 390,054
Expected, number of shares (in shares) |  |  | 319,534 |
Performance Shares [Member] |  |  |  |
Outstanding beginning balance, number of shares (in shares) |  |  | 145,609 |
Outstanding beginning balance, weighted average exercise price (in dollars per share) |  |  | $ 170.75 |
Granted, number of shares (in shares) |  | 59,144 | 59,144 |
Granted, weighted average exercise price (in dollars per share) |  |  | $ 210.07 |
Dividend reinvestment, number of shares (in shares) |  |  | 773 |
Exercised or lapsed, number of shares (in shares) |  |  | (42,610) |
Exercised or lapsed, weighted average exercise price (in dollars per share) |  |  | $ 140.70 |
Canceled, expired or forfeited, number of shares (in shares) |  |  | 0 |
Outstanding ending balance, number of shares (in shares) |  |  | 162,916 |
Outstanding ending balance, weighted average exercise price (in dollars per share) |  |  | $ 192.99 |
Nonvested, number of shares (in shares) |  |  | 162,916 | 145,609
Expected, number of shares (in shares) | [1] |  | 135,055 |
[1] | Includes estimated performance achievement

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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=120381028&loc=d3e5070-113901 + Details
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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=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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