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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Common Stock Issued
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2020   31,324,745      
Balance at Dec. 31, 2020 $ 649.6 $ 3.1 $ 92.2 $ 666.2 $ (111.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 88.9     88.9  
Other comprehensive income (loss), net of tax (7.1)       (7.1)
Dividends paid (55.3)     (55.3)  
Restricted stock issuances, net (in shares)   201,261      
Stock-based employee compensation expense 8.4   8.4    
Stock issued to directors as compensation (in shares)   2,347      
Stock issued to directors as compensation 1.1   1.1    
Purchases and cancellation of common stock (in shares)   (78,790)      
Purchases and retirement of common stock (3.4)     (3.4)  
Balance (in shares) at Dec. 31, 2021   31,449,563      
Balance at Dec. 31, 2021 682.2 $ 3.1 101.7 696.4 (119.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) (6.6)     (6.6)  
Other comprehensive income (loss), net of tax 23.6       23.6
Dividends paid (72.2)     (72.2)  
Restricted stock issuances, net (in shares)   867,897      
Restricted stock issuances, net 0.0 $ 0.1 (0.1)    
Stock-based employee compensation expense 20.2   20.2    
Stock issued to directors as compensation (in shares)   10,079      
Stock issued to directors as compensation 1.1   1.1    
Deferred compensation directors stock trust (in shares)   60,899      
Purchases and cancellation of common stock (in shares)   (273,027)      
Purchases and retirement of common stock (6.9)     (6.9)  
Issuance of shares related to Merger (in shares)   22,814,562      
Issuance of shares related to Merger $ 537.9 $ 2.3 535.6    
Balance (in shares) at Dec. 31, 2022 54,929,973 54,929,973      
Balance at Dec. 31, 2022 $ 1,179.3 $ 5.5 658.5 610.7 (95.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) (309.5)     (309.5)  
Other comprehensive income (loss), net of tax 134.5       134.5
Dividends paid (55.7)     (55.7)  
Restricted stock issuances, net (in shares)   (76,947)      
Restricted stock issuances, net 0.0        
Stock options exercised (in shares)   813      
Stock-based employee compensation expense 10.2   10.2    
Stock issued to directors as compensation (in shares)   16,431      
Stock issued to directors as compensation 1.0   1.0    
Purchases and cancellation of common stock (in shares)   (659,146)      
Purchases and retirement of common stock $ (10.7) $ (0.1) (0.1) (10.5)  
Balance (in shares) at Dec. 31, 2023 54,211,124 54,211,124      
Balance at Dec. 31, 2023 $ 949.1 $ 5.4 $ 669.6 $ 235.0 $ 39.1