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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, 2014 $ 489.0 $ 3.0 $ 49.8 $ 512.7 $ (76.5)
Beginning Balance (in shares) at Dec. 31, 2014   30,465,522      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 18.8     18.8  
Other comprehensive income (loss), net of tax (59.4)       (59.4)
Dividends declared ($0.38 per share in 2015 and $0.40 per share in 2016) (11.6)     (11.6)  
Restricted stock issuances, net (0.6) $ 0.0 (0.6)    
Restricted stock issuances, net (in shares)   36,091      
Stock-based employee compensation expense 1.0   1.0    
Excess tax benefits (expense) of stock-based employee compensation 0.4   0.4    
Stock issued to directors as compensation 0.0 $ 0.0 0.0    
Stock issued to directors as compensation (in shares)   886      
Purchases and retirement of common stock (2.9)     (2.9)  
Purchases and retirement of common stock (in shares)   (63,220)      
Ending Balance at Mar. 31, 2015 434.7 $ 3.0 50.6 517.0 (135.9)
Ending Balance (in shares) at Mar. 31, 2015   30,439,279      
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 (loss), net of tax 25.4       25.4
Dividends declared ($0.38 per share in 2015 and $0.40 per share in 2016) (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