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Stock-Based Compensation (Schedule of Stock-based Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Diversified investments associated with the Executive Stock Unit Program, Current $ 2.3 $ 2.4
Diversified investments associated with the Executive Stock Unit Program, Long-term 30.4 31.6
Diversified investments associated with the Executive Stock Unit Program, Total 32.7 34.0
Liabilities:    
Share Liabilities, Current 2.3 2.4
Share Liabilities, Long-term 17.6 17.1
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts, Current 7.4 7.0
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 7.4 7.0
Total liabilities associated with stock-based compensation, Current 14.6 18.1
Total liabilities associated with stock-based compensation, Long-term 34.6 36.4
Total liabilities associated with stock-based compensation, Total 49.2 54.5
Executive Stock Unit Program    
Liabilities:    
Share Liabilities, Current 2.3 2.4
Share Liabilities, Long-term 31.4 32.0
Share Liabilities, Total 33.7 34.4
Performance Stock Unit award    
Liabilities:    
Share Liabilities, Current 0.6 6.7
Share Liabilities, Long-term 3.2 1.9
Share Liabilities, Total 3.8 8.6
Profitable Growth Incentive award    
Liabilities:    
Share Liabilities, Current 4.3 2.0
Share Liabilities, Long-term 0.0 2.5
Share Liabilities, Total $ 4.3 $ 4.5