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Stock Incentive Plan (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 30, 2023
Dec. 31, 2022
Apr. 28, 2022
Feb. 27, 2023
Jan. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Common stock, shares issuable (in shares)   150,000,000       150,000,000 150,000,000  
Shares available for grant (in shares)   3,780,349       3,780,349    
Compensation cost related to unearned performance awards   $ 30.9       $ 30.9    
Stock compensation expense           34.0 $ 27.6 $ 37.9
Tax benefit from share-based compensation arrangements           $ 1.9 $ 3.3 2.5
Certain retirees and other individuals                
Shares earned (in shares)   13,560            
Subsequent event                
Shares issued (in shares)       183,431        
Shares withheld for taxes (in shares)       106,082        
Performance Shares                
Shares awarded (in shares)           320,120    
Shares earned (in share)   289,513       289,513    
Shares earned (in shares)           256,606    
Recognition period   2 years            
Number of shares not vested (in shares)   543,904       543,904 514,714  
Performance Shares | Certain retirees and other individuals                
Shares earned (in share)             53,681  
Performance Shares | Subsequent event                
Shares awarded (in shares) 140,042              
Restricted Stock Units (RSUs)                
Performance period           3 years    
Shares awarded (in shares)           133,546    
Shares earned (in shares)           70,256    
Compensation cost related to unearned performance awards   $ 13.0       $ 13.0    
Recognition period   1 year 6 months            
Award vesting rights, share conversion ratio           1    
Number of shares not vested (in shares)   213,198       213,198 159,228  
Restricted Stock Units (RSUs) | 2020 Grants                
Awards Outstanding (in shares)   22,451       22,451    
Restricted Stock Units (RSUs) | Certain Retirees                
Shares earned (in shares)           4,380    
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) 100,955              
Issuance of stock awards (in shares)         53,637      
Shares withheld for taxes (in shares)         31,458      
Stock Appreciation Rights (SSARs)                
Awards Outstanding (in shares)   144,984       144,984    
Stock compensation expense           $ 0.5 $ 0.8 $ 1.9
Total fair value of SSARs vested           $ 0.7    
Number of shares not vested (in shares)   57,300       57,300    
Total intrinsic value of outstanding SSARs   $ 10.1       $ 10.1    
Total intrinsic value of exercisable of SSARs   $ 6.2       6.2    
Total intrinsic value of SSARs exercised           2.8    
Restricted Stock                
Stock compensation expense           $ 1.5    
Weighted-average period for compensation cost expected to be recognized           1 year    
Restricted common stocks issued (in shares)     11,664          
Restricted common stocks issued after shares withheld for taxes (in shares)     10,301          
Minimum | Long Term Incentive Plan                
Target award percentages           16.50%    
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