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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Independent Directors | Share-Based Payment Arrangement, Nonemployee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 1.2 $ 1.1 $ 1.1
Phantom Share Units (PSUs) | Management      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 5.4 7.8 8.6
Compensation expense, net of tax 3.7 5.5 6.0
Compensation cost not yet recognized $ 6.9    
Cost not yet recognized, period for recognition 1 year 6 months    
Annual Performance Period Awards (APP) | Executives      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash payment to settle award $ 3.1 3.9 4.5
Annual Performance Period Awards (APP) | Departed Executives      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash payment to settle award $ 0.6 0.9  
Multi-Year Performance Plan Awards (MPP)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 1,524,080    
Multi-Year Performance Plan Awards (MPP) | Executives      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Performance period 3 years    
Maximum payout period following end of performance period 90 days    
Compensation expense $ 1.6 5.1 3.9
Compensation expense, net of tax 1.4 4.3 2.7
Share-based compensation expense to be recognized in 2024 0.9    
Share-based compensation expense to be recognized in 2025 0.4    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense   4.2  
Restricted Stock Units (RSUs) | Executives      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 2.6 1.7 1.5
Compensation expense, net of tax   3.5 $ 1.0
Share-based compensation expense to be recognized in 2024 1.4    
Share-based compensation expense to be recognized in 2025 $ 0.9    
Maximum payout period following end of vesting period 90 days    
Restricted Stock Units (RSUs) | Former CEO      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense, net of tax $ 2.3    
Restricted Stock Units (RSUs) with Performance Conditions | Executives      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 2.2 0.9  
Compensation expense, net of tax 1.9 $ 0.8  
Share-based compensation expense to be recognized in 2024 $ 1.2    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Minimum | Phantom Share Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Minimum | Phantom Share Units (PSUs) | Management      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
Maximum | Phantom Share Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
Maximum | Phantom Share Units (PSUs) | Management      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years