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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative effects of change in accounting standards
Common Stock Issued
Additional Paid-In Capital
Retained Earnings
Retained Earnings
Cumulative effects of change in accounting standards
Accumulated Other Comprehensive (Loss) Income
Balance (in shares) at Dec. 31, 2018     30,771,244        
Balance at Dec. 31, 2018 $ 557.9 $ (0.3) $ 3.1 $ 71.1 $ 608.2 $ (0.3) $ (124.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 85.8       85.8    
Other comprehensive income (loss), net of tax 1.9           1.9
Dividends declared (54.4)       (54.4)    
Restricted stock issuances, net (in shares)     147,113        
Stock-based employee compensation expense 7.6     7.6      
Stock issued to directors as compensation (in shares)     3,601        
Stock issued to directors as compensation 0.1     0.1      
Purchases and cancellation of common stock (in shares)     (25,297)        
Purchases and cancellation of common stock (0.9)       (0.9)    
Balance (in shares) at Dec. 31, 2019     30,896,661        
Balance at Dec. 31, 2019 597.7   $ 3.1 78.8 638.4   (122.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 83.8       83.8    
Other comprehensive income (loss), net of tax 10.7           10.7
Dividends declared (55.0)       (55.0)    
Restricted stock issuances, net (in shares)     302,705        
Stock-based employee compensation expense 8.6     8.6      
Modification to director stock-based compensation 4.0     4.0      
Stock issued to directors as compensation (in shares)     3,689        
Stock issued to directors as compensation 0.8     0.8      
Deferred compensation directors stock trust (in shares)     149,469        
Purchases and cancellation of common stock (in shares)     (27,779)        
Purchases and cancellation of common stock (1.0)       (1.0)    
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 88.9       88.9    
Other comprehensive income (loss), net of tax (7.1)           (7.1)
Dividends declared (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 cancellation 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)