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Note 12 - Equity Compensation Plans (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Proceeds from Stock Options Exercised   $ 56.5 $ 77.2 $ 114.9 $ 93.0
Nonqualified Stock Option, Contractual Term (Year)       10 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       4 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       205,351  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)       5 years 11 months 19 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)       5 years 1 month 20 days  
Unrecognized Compensation Cost Related to Nonvested Share Based Compensation Arrangements   $ 107.1   $ 107.1  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       2 years 5 months 12 days  
Minimum [Member]          
Performance Share Units, Percnetage of Target Levels 0.00%        
Maximum [Member]          
Performance Share Units, Percnetage of Target Levels 200.00%        
Performance Shares [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Per Award (in shares)       1  
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels       100.00%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       48,486  
Performance Shares [Member] | Key Employees [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 48,486        
Performance Shares [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels       0.00%  
Performance Shares [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels       200.00%  
Nonqualified Stock Option [Member] | Key Employees [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 205,034        
Restricted Stock [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 4 years        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       192,836  
Restricted Stock [Member] | Key Employees [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 177,619        
TSR Based PSUs [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 29,783        
ROIC Based PSUs [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 18,703        
Employee Stock Purchase Plan [Member] | UK Sharesave Plan [Member]          
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   455,404   455,404  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years  
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)       10,356 15,776
Employee Stock Purchase Plan [Member] | US ESPP [Member]          
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   1,185,538   1,185,538  
Value of Common Stock Issued to Employees Per Share (in dollars per share)   $ 196.96 $ 184.01 $ 196.96 $ 184.01
The 2021 Incentive Plan [Member]          
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   13,379,717   13,379,717