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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 68.0     68.0  
Other comprehensive income (loss), net of tax (61.7)       (61.7)
Dividends declared ($0.80 per share in 2016 and $0.76 per share in 2015) (34.7)     (34.7)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   70,949      
Stock-based employee compensation expense 1.7   1.7    
Excess tax benefits (expense) of stock-based employee compensation 0.5   0.5    
Stock issued to directors as compensation 0.1 $ 0.0 0.1    
Stock issued to directors as compensation (in shares)   2,638      
Purchases and retirement of common stock (2.9) $ 0.0   (2.9)  
Purchases and retirement of common stock (in shares)   (63,365)      
Ending Balance at Sep. 30, 2015 460.0 $ 3.0 52.1 543.1 (138.2)
Ending Balance (in shares) at Sep. 30, 2015   30,475,744      
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 65.8     65.8  
Other comprehensive income (loss), net of tax 25.3       25.3
Dividends declared ($0.80 per share in 2016 and $0.76 per share in 2015) (36.6)     (36.6)  
Restricted stock issuances, net 0.1 $ 0.1 0.0    
Restricted stock issuances, net (in shares)   94,576      
Stock-based employee compensation expense 3.5   3.5    
Excess tax benefits (expense) of stock-based employee compensation (0.2)   (0.2)    
Stock issued to directors as compensation 0.2 $ 0.0 0.2    
Stock issued to directors as compensation (in shares)   5,031      
Purchases and retirement of common stock (0.6) $ 0.0   (0.6)  
Purchases and retirement of common stock (in shares)   (19,539)      
Ending Balance at Sep. 30, 2016 $ 525.4 $ 3.1 $ 57.2 $ 581.2 $ (116.1)
Ending Balance (in shares) at Sep. 30, 2016   30,554,217