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Stock Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Apr. 28, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized (in shares) 150,000,000   150,000,000   150,000,000   150,000,000
Total stock compensation expense     $ 7.8 $ 6.0 $ 25.4 $ 21.3  
Restricted Stock Unit Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 109.09 $ 113.91  
Shares awarded (in shares)         133,546    
Share-based compensation cost not yet recognized $ 16.1   16.1   $ 16.1    
Shares received for every restricted stock unit award given         1    
Share-based compensation cost not yet recognized, period for recognition 1 year 6 months            
Restricted Stock Unit Awards | Vesting Year One              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage         33.33%    
Restricted Stock Unit Awards | Vesting Year Two              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage         33.33%    
Restricted Stock Unit Awards | Vesting Year Three              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage         33.33%    
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares awarded (in shares)   11,664          
Shares awarded after shares with held for taxes (in shares)   10,301          
Total stock compensation expense         $ 1.5    
Performance Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 119.35 $ 123.33  
Shares awarded (in shares)         320,120    
Share-based compensation cost not yet recognized $ 38.4   38.4   $ 38.4    
Share-based compensation cost not yet recognized, period for recognition 2 years            
Stock-Settled Appreciation Rights              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares awarded (in shares)         0    
Share-based compensation cost not yet recognized $ 0.4   $ 0.4   $ 0.4    
Share-based compensation cost not yet recognized, period for recognition 1 year            
2006 Long Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized (in shares) 10,000,000   10,000,000   10,000,000    
Shares available for grant (in shares) 3,735,396   3,735,396   3,735,396