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Earnings Per Common Share and Stockholders' Equity (Share Repurchase Program and Treasury Stock) (Details) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended 35 Months Ended
Mar. 17, 2023
Sep. 30, 2023
Sep. 30, 2023
Jul. 13, 2023
Dec. 31, 2022
Nov. 11, 2022
Nov. 19, 2021
Class of Stock [Line Items]              
Share repurchase program, authorized amount           $ 400.0 $ 500.0
Treasury stock acquired, shares (in shares)   2,400,000 31,200,000        
Treasury stock acquired, average price per common share (in dollars per share)     $ 35.21        
Stock repurchase program, remaining authorized repurchase amount   $ 276.0 $ 276.0        
Treasury stock, shares (in shares)   30,971,013 30,971,013   24,590,353    
Treasury stock, carrying value   $ 1,100.0 $ 1,100.0   $ 823.1    
Accelerated Share Repurchase (ASR)              
Class of Stock [Line Items]              
Share repurchase program, authorized amount $ 200.0            
Treasury stock acquired, shares (in shares) 4,800,000            
Treasury stock, acquired, percentage 80.00%            
Treasury stock acquired, average price per common share (in dollars per share) $ 33.12            
Accelerated share repurchases, settlement (payment) or receipt       $ 14.0