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Stock Incentive Plan (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 20, 2022
Dec. 31, 2021
Apr. 22, 2021
Feb. 25, 2022
Jan. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Common stock, shares issuable (in shares)   150,000,000       150,000,000 150,000,000  
Shares available for grant (in shares)   4,000,968       4,000,968    
Compensation cost related to unearned performance awards   $ 20.6       $ 20.6    
Stock compensation expense           27.6 $ 37.9 $ 41.7
Excess tax benefit of stock awards           $ 3.3 $ 2.5 $ 2.7
Certain retirees and other individuals                
Shares earned (in shares)   59,182            
Subsequent event                
Shares issued (in shares)       330,174        
Shares withheld for taxes (in shares)       125,363        
Performance Shares                
Shares awarded (in shares)           281,310    
Shares earned (in share)   330,174       330,174    
Shares earned (in shares)           309,198    
Recognition period   1 year 6 months            
Weighted average grant-date fair value (in dollars per share)           $ 123.33 $ 70.84 $ 61.01
Number of shares not vested (in shares)   514,714       514,714 582,952  
Performance Shares | Certain retirees and other individuals                
Shares earned (in share)             97,818  
Performance Shares | Subsequent event                
Shares awarded (in shares) 137,283              
Restricted Stock Units (RSUs)                
Performance period           3 years    
Shares awarded (in shares)           92,848    
Shares earned (in shares)           67,110    
Compensation cost related to unearned performance awards   $ 8.5       $ 8.5    
Recognition period   1 year 6 months            
Award vesting rights, share conversion ratio           1    
Weighted average grant-date fair value (in dollars per share)           $ 113.91 $ 70.83 61.01
Number of shares not vested (in shares)   159,228       159,228 143,287  
Restricted Stock Units (RSUs) | Certain Retirees                
Shares earned (in shares)           3,830    
Restricted Stock Units (RSUs) | Certain Executives | 2020 Grants                
Vesting period           3 years    
Restricted Stock Units (RSUs) | Tranche one                
Award vesting percentage           33.33%    
Restricted Stock Units (RSUs) | Tranche two                
Award vesting percentage           33.33%    
Restricted Stock Units (RSUs) | Tranche three                
Award vesting percentage           33.33%    
Restricted Stock Units (RSUs) | Subsequent event                
Shares awarded (in shares) 91,583              
Issuance of stock awards (in shares)         44,991      
Shares withheld for taxes (in shares)         23,726      
Stock Appreciation Rights (SSARs)                
Compensation cost related to unearned performance awards   $ 0.8       $ 0.8    
Recognition period   1 year 6 months            
Weighted average grant-date fair value (in dollars per share)             $ 12.31 $ 11.34
SSAR expiration period           7 years    
Vesting period           4 years    
Stock compensation expense           $ 0.8 $ 1.9 $ 2.4
Weighted average remaining contractual life of SSARs outstanding           4 years    
Total fair value of SSARs vested           $ 1.5    
Number of shares not vested (in shares)   120,675       120,675    
Total intrinsic value of outstanding SSARs   $ 9.3       $ 9.3    
Total intrinsic value of exercisable of SSARs   $ 3.7       3.7    
Total intrinsic value of SSARs exercised           13.6    
Restricted Stock                
Stock compensation expense           $ 1.4    
Weighted-average period for compensation cost expected to be recognized           1 year    
Restricted common stocks issued (in shares)     9,117          
Restricted common stocks issued after shares withheld for taxes (in shares)     7,899          
Minimum | Long Term Incentive Plan                
Target award percentages           33.00%    
Maximum | Long Term Incentive Plan                
Target award percentages           200.00%    
2006 Plan                
Common stock, shares issuable (in shares)   10,000,000       10,000,000    
Long Term Incentive Plan                
Performance period           3 years