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Stock-Based Compensation (Schedule of Stock-based Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Assets:    
Diversified investments associated with the ESU program, current $ 3.1 $ 3.6
Diversified investments associated with the ESU program, long-term 39.7 47.4
Diversified investments associated with the ESU program, total 42.8 51.0
Liabilities:    
Share liabilities, current 3.1 3.5
Share liabilities, long-term 10.8 13.2
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts, current 5.9 5.6
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 5.9 5.6
Total liabilities associated with stock-based compensation, current 9.0 12.7
Total liabilities associated with stock-based compensation, long-term 42.2 51.1
Total liabilities associated with stock-based compensation, total 51.2 63.8
Executive Stock Unit Program    
Liabilities:    
Share liabilities, current 3.1 3.6
Share liabilities, long-term 40.9 47.3
Share liabilities, total 44.0 50.9
Performance Stock Unit (TSR) award    
Liabilities:    
Share liabilities, current 0.0 0.0
Share liabilities, long-term 0.6 1.1
Share liabilities, total 0.6 1.1
Performance Stock Unit (EBIT) award    
Liabilities:    
Share liabilities, current 0.0 3.5
Share liabilities, long-term 0.7 2.7
Share liabilities, total $ 0.7 $ 6.2