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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) - USD ($)
$ in Millions
3 Months Ended 7 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Jul. 21, 2021
Sep. 30, 2022
Sep. 30, 2021
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 8.7 $ 15.2     $ 26.9 $ 5.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       770,500    
Restricted Stock Award, Forfeitures     $ 11.5      
Total 83.5       83.5  
Equity Option [Member]            
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense 8.1 14.7     25.1 14.7
Restricted Stock Units [Member]            
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense 0.6 0.4     1.8 (1.5)
Restricted Stock [Member]            
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 0.0 $ 0.1     $ 0.0 $ (7.8)