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Stock Compensation Plans (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 29, 2025
Apr. 27, 2023
Feb. 18, 2025
Jan. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Common stock, shares issuable (in shares)         150,000,000 150,000,000  
Stock compensation expense         $ 18.4 $ 46.4 $ 34.0
Performance Shares              
Shares granted (in shares)         344,592    
Shares earned (in share)         167,875    
Compensation cost related to unearned performance awards         $ 8.3    
Recognition period         1 year 6 months    
Number of shares not vested (in shares)         570,150 571,382  
Performance Shares | Subsequent event              
Shares granted (in shares) 215,621            
Shares issued (in shares)     105,053        
Shares withheld for taxes (in shares)     62,822        
Performance Shares | Certain retirees and other individuals              
Shares earned (in share)           1,997  
Restricted Stock Units (RSUs)              
Service period         3 years    
Shares granted (in shares)         200,560    
Compensation cost related to unearned performance awards         $ 19.6    
Recognition period         1 year 6 months    
Award vesting rights, share conversion ratio         1    
Number of shares not vested (in shares)         269,202 213,947  
Restricted Stock Units (RSUs) | Subsequent event              
Shares granted (in shares) 148,578            
RSUs issued after shares withheld for taxes (in shares)       56,009      
Shares withheld for taxes (in shares)       34,605      
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              
RSUs issued after shares withheld for taxes (in shares)   12,842          
Stock compensation expense         $ 1.7    
Weighted-average period for compensation cost expected to be recognized         1 year    
Restricted common stocks issued (in shares)   14,148          
2006 Long-Term Incentive Plan              
Common stock, shares issuable (in shares)         10,000,000    
Shares available for grant (in shares)         3,441,051    
Long Term Incentive Plan              
Service period         3 years    
Long Term Incentive Plan | Minimum              
Target award percentages         16.50%    
Long Term Incentive Plan | Maximum              
Target award percentages         200.00%