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Stock-Based Compensation - Share-based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1.5 $ 0.6 $ 10.4 $ 7.8
Stock option compensation expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 0.3 0.4 2.4 3.1
RSU compensation expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 1.3 0.8 4.9 3.8
PSU compensation expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ (0.1) $ (0.6) $ 3.1 $ 0.9