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Stock-Based Compensation (Stock-Based Compensation Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-Based Payment Arrangement, Noncash Expense [Abstract] |  |  |
Stock or Unit Option Plan Expense | $ 0.0 | $ 0.1 | $ 0.1
Stock Appreciation Rights Expense | 1.0 | 0.9 | 11.6
Allocated Share-based Compensation Expense | 2.3 | 1.9 | 12.2
Share-based Payment Arrangement, Expense, Tax Benefit | (0.3) | (0.2) | (1.5)
Restricted Stock Units (RSUs) [Member] |  |  |
Share-Based Payment Arrangement, Noncash Expense [Abstract] |  |  |
Restricted Stock or Unit Expense | 0.9 | 0.7 | 0.5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted Stock or Unit Expense | 0.9 | 0.7 | 0.5
Restricted Stock |  |  |
Share-Based Payment Arrangement, Noncash Expense [Abstract] |  |  |
Restricted Stock or Unit Expense | 0.4 | 0.2 | 0.0
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted Stock or Unit Expense | $ 0.4 | $ 0.2 | $ 0.0

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