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Stock-Based Compensation (Stock-Based Compensation Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation [Abstract]    
Restricted Stock or Unit Expense $ 0.1 $ 0.2
Stock or Unit Option Plan Expense 0.4 0.3
Allocated Share-based Compensation Expense $ 0.5 $ 0.5