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Stock-Based Compensation (Schedule of Stock-based Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Assets: |  |
Diversified investments associated with the ESU program, current | $ 3.6 | $ 3.1
Diversified investments associated with the ESU program, long-term | 46.8 | 39.7
Diversified investments associated with the ESU program, total | 50.4 | 42.8
Liabilities: |  |
Share liabilities, current | 3.7 | 3.1
Share liabilities, long-term | 11.2 | 10.8
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts, current | 5.5 | 5.9
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 | 5.9
Total liabilities associated with stock-based compensation, current | 9.3 | 9.0
Total liabilities associated with stock-based compensation, long-term | 50.5 | 42.2
Total liabilities associated with stock-based compensation, total | 59.8 | 51.2
ESU program |  |
Liabilities: |  |
Share liabilities, current | 3.7 | 3.1
Share liabilities, long-term | 48.7 | 40.9
Share liabilities, total | 52.4 | 44.0
PSU awards |  |
Liabilities: |  |
Share liabilities, current | 0.1 | 0.0
Share liabilities, long-term | 1.8 | 1.3
Share liabilities, total | $ 1.9 | $ 1.3

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