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Stock-Based Compensation (Share-based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense (income) $ 0.9 $ (1.2) $ 6.3 $ 6.0
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense (income) 0.7 0.5 2.0 1.5
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense (income) 1.2 0.8 4.1 3.7
Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense (income) $ (1.0) $ (2.5) $ 0.2 $ 0.8