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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock Issued [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2015 $ 467.9 $ 3.0 $ 53.7 $ 552.6 $ (141.4)
Beginning Balance (in shares) at Dec. 31, 2015   30,474,149      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 47.1     47.1  
Other comprehensive income, net of tax 23.8       23.8
Dividends declared (24.4)     (24.4)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   94,260      
Stock-based employee compensation expense 2.6   2.6    
Excess tax benefits (expense) of stock-based employee compensation (0.2)   (0.2)    
Stock issued to directors as compensation 0.1 $ 0.0 0.1    
Stock issued to directors as compensation (in shares)   3,333      
Purchases and retirement of common stock (0.6) $ 0.0   (0.6)  
Purchases and retirement of common stock (in shares)   (18,538)      
Ending Balance at Jun. 30, 2016 516.3 $ 3.0 56.2 574.7 (117.6)
Ending Balance (in shares) at Jun. 30, 2016   30,553,204      
Beginning Balance at Dec. 31, 2016 508.3 $ 3.1 59.2 585.3 (139.3)
Beginning Balance (in shares) at Dec. 31, 2016   30,544,494      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 36.0     36.0  
Other comprehensive income, net of tax 24.9       24.9
Dividends declared (25.8)     (25.8)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   184,213      
Stock-based employee compensation expense 2.2   2.2    
Stock issued to directors as compensation 0.1 $ 0.0 0.1    
Stock issued to directors as compensation (in shares)   2,741      
Purchases and retirement of common stock (1.0) $ 0.0 0.0 (1.0)  
Purchases and retirement of common stock (in shares)   (24,587)      
Ending Balance at Jun. 30, 2017 $ 544.7 $ 3.1 $ 61.5 $ 594.5 $ (114.4)
Ending Balance (in shares) at Jun. 30, 2017   30,706,861