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Stock-Based Compensation (Unrecognized Compensation Expense) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Expense $ 5.9
Weighted Average Years Expense To Be Recognized Over 2 years 1 month 6 days
Restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Expense $ 8.0
Weighted Average Years Expense To Be Recognized Over 2 years 1 month 6 days
Performance stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Expense $ 0.7
Weighted Average Years Expense To Be Recognized Over 2 years 6 months