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Note 17 - Compensation Plans (Details Textual)		12 Months Ended			24 Months Ended
	Jan. 01, 2019	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	May 19, 2021 shares
Share-based Payment Arrangement, Expense		$ 55,700,000	$ 47,600,000	$ 42,700,000
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
Share-based Payment Arrangement, Expense, Tax Benefit		$ 35,900,000	$ 42,900,000	$ 23,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)		6 years	6 years
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 8 months 12 days
Unrecognized Compensation Cost Related to Nonvested Share Based Compensation Arrangements		$ 88,000,000.0			$ 88,000,000.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		2 years 3 months 18 days
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, 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		$ 25,000.0			$ 25,000.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares		$ 35.15	$ 25.87	$ 24.13
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%
Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Basis to Reduce for Shares Issued Subject to Option or Stock Appreciation Rights		1	1		1
The 2021 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares						16,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Basis to Reduce for Shares Issued Subject to Awards Other Than Options or Stock Appreciation Rights						2.5
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares		14,915,295			14,915,295
KSOP [Member]
Maximum Pre Tax Employee Contribution To Saving Plan		$ 19,500	$ 19,500	$ 19,000.0	$ 19,500
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		$ 6,500	6,500	6,000.0	$ 6,500
Maximum Employee Contribution As Percentage Of Compensation	6.00%	10.00%			10.00%
Percentage Of Employer Contribution	100.00%
Share-based Payment Arrangement, Expense		$ 33,700,000	$ 31,600,000	$ 31,000,000.0
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		451,207			451,207
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		11,254	8,174	18,713
Value of Common Stock Issued to Employees Per Share (in dollars per share) | $ / shares		$ 166.16	$ 159.98	$ 136.35	$ 166.16
Employee Stock Purchase Plan [Member] | US ESPP [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares		1,226,292			1,226,292
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) | shares		33,974	32,502	30,705
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares		$ 181.77	$ 164.44	$ 141.17

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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X

- Definition

Aggregate number of common shares reserved for future issuance.

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X

- 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.

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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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.

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X

- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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X

- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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X

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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X

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Number of shares issued under share-based payment arrangement.

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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.

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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.

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X

- Definition

Represents additional pre tax certain eligible employee contribution to saving plan.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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X

- 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.

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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.

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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.

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No definition available.

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- Definition

This element represents the percentage at which an employer is to make the 401(k) match.

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No definition available.

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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.

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Balance Type:	credit
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X

- 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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X

- Definition

Represents minimum participant age of share-based compensation arrangement by share-based payment award.

+ References

No definition available.

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- Definition

Represents number of shares authorized basis to reduce for shares issued subjected to awards other than options for stock appreciation right for share-based compensation arrangement by share-based payment award.

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Basis to Reduce for Shares Issued Subject to Option or Stock Appreciation Rights

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No definition available.

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- Definition

The percent target levels for an award in a share-baesd compensation arrangement.

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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.

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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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