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Condensed 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)
Beginning Balance (in shares) at Dec. 31, 2019   30,896,661      
Beginning Balance at Dec. 31, 2019 $ 597.7 $ 3.1 $ 78.8 $ 638.4 $ (122.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 44.0     44.0  
Other comprehensive income, net of tax (14.4)       (14.4)
Dividends declared (27.4)     (27.4)  
Restricted stock issuances, net (in shares)   321,858      
Stock-based employee compensation expense 4.1   4.1    
Modification to director stock-based compensation plan 4.0   4.0    
Stock issued to directors as compensation (in shares)   2,198      
Stock issued to directors as compensation 0.3   0.3    
Purchases and retirement of common stock (in shares)   (25,708)      
Purchases and retirement of common stock (0.9)     (0.9)  
Ending Balance (in shares) at Jun. 30, 2020   31,195,009      
Ending Balance at Jun. 30, 2020 607.4 $ 3.1 87.2 654.1 (137.0)
Beginning Balance (in shares) at Mar. 31, 2020   31,192,522      
Beginning Balance at Mar. 31, 2020 592.0 $ 3.1 81.0 646.2 (138.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 21.5     21.5  
Other comprehensive income, net of tax 1.3       1.3
Dividends declared (13.7)     (13.7)  
Restricted stock issuances, net (in shares)   1,853      
Stock-based employee compensation expense 2.0   2.0    
Modification to director stock-based compensation plan 4.0   4.0    
Stock issued to directors as compensation (in shares)   1,068      
Stock issued to directors as compensation 0.2   0.2    
Purchases and retirement of common stock (in shares)   (434)      
Purchases and retirement of common stock 0.1     0.1  
Ending Balance (in shares) at Jun. 30, 2020   31,195,009      
Ending Balance at Jun. 30, 2020 607.4 $ 3.1 87.2 654.1 (137.0)
Beginning Balance (in shares) at Dec. 31, 2020   31,324,745      
Beginning Balance at Dec. 31, 2020 649.6 $ 3.1 92.2 666.2 (111.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 23.4     23.4  
Other comprehensive income, net of tax 5.6       5.6
Dividends declared (27.6)        
Restricted stock issuances, net (in shares)   168,096      
Stock-based employee compensation expense 4.6   4.6    
Stock issued to directors as compensation (in shares)   1,074      
Stock issued to directors as compensation 0.5   0.5    
Purchases and retirement of common stock (in shares)   (67,786)      
Purchases and retirement of common stock (3.1)        
Ending Balance (in shares) at Jun. 30, 2021   31,426,129      
Ending Balance at Jun. 30, 2021 653.0 $ 3.1 97.3 658.9 (106.3)
Beginning Balance (in shares) at Mar. 31, 2021   31,407,136      
Beginning Balance at Mar. 31, 2021 652.9 $ 3.1 94.6 670.9 (115.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 1.8     1.8  
Other comprehensive income, net of tax 9.4       9.4
Dividends declared (13.8)     (13.8)  
Restricted stock issuances, net (in shares)   19,566      
Stock-based employee compensation expense 2.5   2.5    
Stock issued to directors as compensation (in shares)   484      
Stock issued to directors as compensation 0.2   0.2    
Purchases and retirement of common stock (in shares)   (1,057)      
Ending Balance (in shares) at Jun. 30, 2021   31,426,129      
Ending Balance at Jun. 30, 2021 $ 653.0 $ 3.1 $ 97.3 $ 658.9 $ (106.3)