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Stock-Based Compensation (Schedule of Stock-based Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Assets: |  |
Diversified investments associated with the ESU program, current | $ 3.7 | $ 3.6
Diversified investments associated with the ESU program, long-term | 51.4 | 46.8
Diversified investments associated with the ESU program, total | 55.1 | 50.4
Liabilities: |  |
Share liabilities, current | 3.7 | 3.7
Share liabilities, long-term | 9.0 | 11.2
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts, current | 5.5 | 5.5
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts, long-term | 0.0 | 0.0
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts, total | 5.5 | 5.5
Total liabilities associated with stock-based compensation, current | 9.2 | 9.3
Total liabilities associated with stock-based compensation, long-term | 51.2 | 50.5
Total liabilities associated with stock-based compensation, total | 60.4 | 59.8
ESU program |  |
Liabilities: |  |
Share liabilities, current | 3.7 | 3.7
Share liabilities, long-term | 50.2 | 48.7
Share liabilities, total | 53.9 | 52.4
PSU awards |  |
Liabilities: |  |
Share liabilities, current | 0.0 | 0.1
Share liabilities, long-term | 1.0 | 1.8
Share liabilities, total | $ 1.0 | $ 1.9

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