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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 (Loss) Income
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 68.5     68.5  
Other comprehensive income, net of tax (5.6)       (5.6)
Dividends declared (41.2)     (41.2)  
Restricted stock issuances, net (in shares)   299,926      
Stock-based employee compensation expense 5.5   5.5    
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 0.5   0.5    
Deferred compensation directors stock trust (in shares)   149,469      
Purchases and retirement of common stock (in shares)   (26,479)      
Purchases and retirement of common stock (0.9)     (0.9)  
Ending Balance (in shares) at Sep. 30, 2020   31,321,775      
Ending Balance at Sep. 30, 2020 628.5 $ 3.1 88.8 664.8 (128.2)
Beginning Balance (in shares) at Jun. 30, 2020   31,195,009      
Beginning Balance at Jun. 30, 2020 607.4 $ 3.1 87.2 654.1 (137.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 24.5     24.5  
Other comprehensive income, net of tax 8.8       8.8
Dividends declared (13.8)     (13.8)  
Restricted stock issuances, net (in shares)   (21,932)      
Stock-based employee compensation expense 1.4   1.4    
Stock issued to directors as compensation (in shares)   0      
Stock issued to directors as compensation 0.2   0.2    
Deferred compensation directors stock trust (in shares)   149,469      
Purchases and retirement of common stock (in shares)   (771)      
Ending Balance (in shares) at Sep. 30, 2020   31,321,775      
Ending Balance at Sep. 30, 2020 628.5 $ 3.1 88.8 664.8 (128.2)
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 35.6     35.6  
Other comprehensive income, net of tax (12.0)       (12.0)
Dividends declared (41.5)     (41.5)  
Restricted stock issuances, net (in shares)   200,645      
Stock-based employee compensation expense 6.3   6.3    
Stock issued to directors as compensation (in shares)   1,662      
Stock issued to directors as compensation 0.8   0.8    
Purchases and retirement of common stock (in shares)   (70,068)      
Purchases and retirement of common stock (3.1)     (3.1)  
Ending Balance (in shares) at Sep. 30, 2021   31,456,984      
Ending Balance at Sep. 30, 2021 635.7 $ 3.1 99.3 657.2 (123.9)
Beginning Balance (in shares) at Jun. 30, 2021   31,426,129      
Beginning Balance at Jun. 30, 2021 653.0 $ 3.1 97.3 658.9 (106.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 12.2     12.2  
Other comprehensive income, net of tax (17.6)       (17.6)
Dividends declared (13.9)     (13.9)  
Restricted stock issuances, net (in shares)   32,549      
Stock-based employee compensation expense 1.7   1.7    
Stock issued to directors as compensation (in shares)   588      
Stock issued to directors as compensation 0.3   0.3    
Purchases and retirement of common stock (in shares)   (2,282)      
Ending Balance (in shares) at Sep. 30, 2021   31,456,984      
Ending Balance at Sep. 30, 2021 $ 635.7 $ 3.1 $ 99.3 $ 657.2 $ (123.9)