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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 |  |

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