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Stock-Based Compensation (Stock-Based Compensation Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation [Abstract]        
Restricted Stock or Unit Expense       $ 0.1
Stock or Unit Option Plan Expense $ 0.1 $ 0.1 $ 0.2 0.2
Allocated Share-based Compensation Expense $ 0.1 $ 0.1 $ 0.2 $ 0.3