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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 21.1     21.1  
Other comprehensive income, net of tax 25.4       25.4
Dividends declared (12.2)     (12.2)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   91,408      
Stock-based employee compensation expense 1.3   1.3    
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)   1,428      
Purchases and retirement of common stock (0.6) $ 0.0   (0.6)  
Purchases and retirement of common stock (in shares)   (18,379)      
Ending Balance at Mar. 31, 2016 502.8 $ 3.0 54.9 560.9 (116.0)
Ending Balance (in shares) at Mar. 31, 2016   30,548,606      
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 13.7     13.7  
Other comprehensive income, net of tax 8.3       8.3
Dividends declared (12.9)     (12.9)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   169,947      
Stock-based employee compensation expense 1.3   1.3    
Stock issued to directors as compensation 0.1 $ 0.0 0.1    
Stock issued to directors as compensation (in shares)   1,317      
Purchases and retirement of common stock (1.1) $ 0.0 0.0 (1.1)  
Purchases and retirement of common stock (in shares)   (24,200)      
Ending Balance at Mar. 31, 2017 $ 517.7 $ 3.1 $ 60.6 $ 585.0 $ (131.0)
Ending Balance (in shares) at Mar. 31, 2017   30,691,558