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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, 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   (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      
Beginning Balance at Dec. 31, 2017 546.7 $ 3.1 66.3 566.7 (89.4)
Beginning Balance (in shares) at Dec. 31, 2017   30,711,299      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 20.5     20.5  
Other comprehensive income, net of tax 10.8       10.8
Dividends declared (13.2)     (13.2)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   117,828      
Stock-based employee compensation expense 1.4   1.4    
Stock issued to directors as compensation 0.1 $ 0.0 0.1    
Stock issued to directors as compensation (in shares)   1,404      
Purchases and retirement of common stock (2.5) $ 0.0 0.0 (2.5)  
Purchases and retirement of common stock (in shares)   (62,634)      
Ending Balance at Mar. 31, 2018 562.1 $ 3.1 $ 67.8 569.8 $ (78.6)
Ending Balance (in shares) at Mar. 31, 2018   30,767,897      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effects of changes in accounting standards $ (1.7)     $ (1.7)