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Stockholders' Equity - Equity Awards Modification (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Equity Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Modification expense $ 0.4 $ 3.0 $ 0.4 $ 3.1