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Stock-Based Compensation (Schedule of Stock-based Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
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