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Note 17 - Compensation Plans (Details Textual) |  | 12 Months Ended | 22 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares
Share-Based Payment Arrangement, Expense |  | $ 54,000,000 | $ 56,500,000 | $ 55,700,000 |
Number of Service Hours |  | 1,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |
Profit Sharing Contributions |  | $ 0 | $ 0 | 0 |
Proceeds from Stock Options Exercised |  | 141,900,000 | 132,500,000 | 84,300,000 |
Share-Based Payment Arrangement, Expense, Tax Benefit |  | $ 20,600,000 | $ 26,500,000 | $ 35,900,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  | 5 years 7 months 6 days | 5 years 10 months 24 days |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year) |  | 4 years 9 months 18 days | 4 years 10 months 24 days |  |
Unrecognized Compensation Cost Related to Nonvested Share Based Compensation Arrangements |  | $ 76,200,000 |  |  | $ 76,200,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 2 years 2 months 4 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date |  | 5.00% |  |  | 5.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares |  | 211,945 | 653,802 | 750,822 |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate |  | 20.00% |  |  | 20.00%
Share Based Compensation Arrangement By Share Based Payment Award, Percentage Of Short Term Incentive Compensation Available For Payroll Deductions Maximum |  | 50.00% |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Payroll Deductions Amount Maximum |  | $ 25,000 |  |  | $ 25,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  | $ 52.69 | $ 42.25 | $ 35.15 |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels |  | 0.00% |  |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels |  | 200.00% |  |  |
The 2021 Incentive Plan [Member] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  | 13,441,921 |  |  | 13,441,921
Proceeds from Stock Options Exercised |  | $ 141,900,000 | $ 132,500,000 |  |
KSOP [Member] |  |  |  |  |
Maximum Pre Tax Employee Contribution To Saving Plan |  | 22,500 | 20,500 | $ 19,500 | $ 22,500
Share-based Compensation Arrangement by Share-based Payment Award, Additional Employee Contribution, Minimum Participant Age (Year) |  |  |  | 50 years |
Additional Pre Tax Certain Eligible Employee Contribution To Saving Plan |  | 7,500 | $ 6,500 |  | $ 7,500
Maximum Employee Contribution As Percentage Of Compensation | 6.00% |  | 10.00% |  |
Percentage Of Employer Contribution | 100.00% |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 32,400,000 | $ 40,000,000 | $ 33,700,000 |
Number of Service Hours |  | 1,000 |  |  |
Employee Stock Purchase Plan [Member] | UK Sharesave Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 3 years |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  | 441,528 |  |  | 441,528
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date |  | 5.00% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) | shares |  | 5,144 |  | 11,254 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares |  |  | 9,370 |  |
Value of Common Stock Issued to Employees Per Share (in dollars per share) | $ / shares |  | $ 227.65 | $ 178.26 | $ 166.16 | $ 227.65
Employee Stock Purchase Plan [Member] | US ESPP [Member] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  | 1,177,258 |  |  | 1,177,258
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) | shares |  | 18,636 | 30,398 | 33,974 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  | $ 209.68 | $ 174.66 | $ 181.77 |

X
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Subparagraph (a) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2A + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Represents additional pre tax certain eligible employee contribution to saving plan. + References No definition available. + Details
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- Definition This element represents the maximum percentage of compensation eligible participants could make to a 401(k) plan account during the reporting period. + References No definition available. + Details
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- Definition This element represents the maximum pre-tax contribution that can be made to an 401(k) plan account as determined under the provisions of Code Section 401(g) during the reporting period. + References No definition available. + Details
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- Definition This element represents the number of service hours required from employees in a plan year to be qualified for certain employee benefits. + References No definition available. + Details
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- Definition This element represents the percentage at which an employer is to make the 401(k) match. + References No definition available. + Details
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- Definition This element represents the amount contributed by an entity to one of its employee benefit plans. The profit sharing plan is discretionary dependent upon the performance of the entity. + References No definition available. + Details
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- Definition This element represents the maximum amount of payroll deduction from an employee's salary which could be authorized under an entity's employee stock purchase plan. + References No definition available. + Details
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- Definition This element represents the maximum percentage of payroll deduction from short-term incentive compensation which could be authorized under an entity's employee stock purchase plan. + References No definition available. + Details
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- Definition Represents minimum participant age of share-based compensation arrangement by share-based payment award. + References No definition available. + Details
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- Definition The percent target levels for an award in a share-baesd compensation arrangement. + References No definition available. + Details
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- Definition As of the balance-sheet date, the aggregate unrecognized cost of share-based awards made to employees and non-employees under share-based compensation plans that have yet to vest. + References No definition available. + Details
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- Definition This element represents the discount price per share offered to employees who participate in the ESPP Plan. + References No definition available. + Details
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