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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock Issued
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive (Loss) Income
Balance (in shares) at Dec. 31, 2015   30,474,149      
Balance at Dec. 31, 2015 $ 467.9 $ 3.0 $ 53.7 $ 552.6 $ (141.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 82.8     82.8  
Other comprehensive income (loss), net of tax 2.1       2.1
Dividends declared (49.4)     (49.4)  
Restricted stock issuances, net (in shares)   84,105      
Restricted stock issuances, net 0.1 $ 0.1      
Stock-based employee compensation expense 5.5   5.5    
Excess tax benefits of stock-based employee compensation (0.2)   (0.2)    
Stock issued to directors as compensation (in shares)   6,585      
Stock issued to directors as compensation 0.2   0.2    
Purchases and cancellation of common stock (in shares)   (20,345)      
Purchases and cancellation of common stock (0.7)     (0.7)  
Balance (in shares) at Dec. 31, 2016   30,544,494      
Balance at Dec. 31, 2016 508.3 $ 3.1 59.2 585.3 (139.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 34.5     34.5  
Other comprehensive income (loss), net of tax 49.9       49.9
Dividends declared (51.9)     (51.9)  
Restricted stock issuances, net (in shares)   186,867      
Restricted stock issuances, net 0.0        
Stock-based employee compensation expense 6.9   6.9    
Stock issued to directors as compensation (in shares)   5,798      
Stock issued to directors as compensation 0.2   0.2    
Purchases and cancellation of common stock (in shares)   (25,860)      
Purchases and cancellation of common stock (1.2)     (1.2)  
Balance (in shares) at Dec. 31, 2017   30,711,299      
Balance at Dec. 31, 2017 546.7 $ 3.1 66.3 566.7 (89.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 94.5     94.5  
Other comprehensive income (loss), net of tax (30.2)       (30.2)
Dividends declared (53.2)     (53.2)  
Restricted stock issuances, net (in shares)   130,617      
Restricted stock issuances, net 0.0        
Stock-based employee compensation expense 4.6   4.6    
Stock issued to directors as compensation (in shares)   4,723      
Stock issued to directors as compensation 0.2   0.2    
Purchases and cancellation of common stock (in shares)   (75,395)      
Purchases and cancellation of common stock (3.0)     (3.0)  
Balance (in shares) at Dec. 31, 2018   30,771,244      
Balance at Dec. 31, 2018 $ 557.9 $ 3.1 $ 71.1 $ 608.2 $ (124.5)