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Earnings Per Common Share and Stockholders' Equity (Share Repurchase Program and Treasury Stock) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended 38 Months Ended
Mar. 17, 2023
Dec. 31, 2023
Dec. 31, 2023
Jul. 13, 2023
Dec. 31, 2022
Nov. 11, 2022
Nov. 19, 2021
Class of Stock [Line Items]              
Stock repurchase program, authorized amount           $ 400.0 $ 500.0
Treasury stock acquired, shares   2,400,000 31,200,000        
Treasury stock acquired, average cost per share     $ 35.21        
Stock repurchase program, remaining authorized repurchase amount   $ 276.0 $ 276.0        
Treasury stock, shares   30,765,023 30,765,023   24,590,353    
Treasury stock, carrying value   $ 1,000.0 $ 1,000.0   $ 823.1    
Accelerated Share Repurchase Agreement (ASR)              
Class of Stock [Line Items]              
Stock repurchase program, authorized amount $ 200.0            
Treasury stock acquired, shares 4,800,000            
Treasury stock acquired, percentage of shares authorized 80.00%            
Treasury stock acquired, average cost per share $ 33.12            
Accelerated share repurchase agreement, settlement payment       $ 14.0