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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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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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

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This element represents the maximum percentage of compensation eligible participants could make to a 401(k) plan account during the reporting period.

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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.

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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.

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Note 17 - Compensation Plans (Details Textual)				12 Months Ended
Note 17 - Compensation Plans (Details Textual)	Jan. 01, 2019	Apr. 01, 2018	Mar. 31, 2018	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Payment Arrangement, Expense				$ 47,600,000	$ 42,700,000	$ 38,500,000
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				42,900,000	23,200,000	48,900,000
Proceeds from Stock Options Exercised				$ 88,000,000.0	$ 52,400,000	87,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)				6 years	5 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)				4 years 8 months 12 days	4 years 7 months 6 days
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation				$ 4,100,000	$ 5,500,000	$ 3,700,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) \| shares				27,890	40,578	35,637
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount				$ 82,400,000
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, Options, Vested in Period, Fair Value				$ 20,100,000	$ 17,400,000	$ 16,800,000
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%
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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares				$ 25.87	$ 24.13	$ 21.48
The 2013 Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares) \| shares				3,104,938
ESPP [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares) \| shares				1,260,266
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) \| shares				32,502	30,705	30,550
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares				$ 164.44	$ 141.17	$ 104.71
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 (in shares) \| shares				15,700,000
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
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
KSOP [Member]
Maximum Pre Tax Employee Contribution To Saving Plan				$ 19,500	$ 19,000.0	$ 18,500
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	6,000.0	6,000.0
Maximum Employee Contribution As Percentage Of Compensation	6.00%			10.00%
Percentage Of Employer Contribution	100.00%	87.50%	75.00%
Employee Contribution, Percentage of Compensation		6.00%	6.00%
Share-based Payment Arrangement, Expense				$ 31,600,000	31,000,000.0	22,000,000.0
Number of Service Hours				1,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				4 years
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation				$ 4,100,000	$ 5,500,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) \| shares				27,890	40,578
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 22,300,000	$ 20,200,000	18,600,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 8,200,000	$ 4,200,000	$ 1,500,000
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				454,178
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				8,174	18,713	19,247
Value of Common Stock Issued to Employees Per Share (in dollars per share) \| $ / shares				$ 159.98	$ 136.35	$ 101.27