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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 65.8     65.8  
Other comprehensive income, net of tax 25.3       25.3
Dividends declared (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      
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 61.8     61.8  
Other comprehensive income, net of tax 34.3       34.3
Dividends declared (38.7)     (38.7)  
Restricted stock issuances, net 0.0 $ 0.0 0.0    
Restricted stock issuances, net (in shares)   186,773      
Stock-based employee compensation expense 4.3   4.3    
Stock issued to directors as compensation 0.2 $ 0.0 0.2    
Stock issued to directors as compensation (in shares)   4,352      
Purchases and retirement of common stock (1.1) $ 0.0 0.0 (1.1)  
Purchases and retirement of common stock (in shares)   (25,176)      
Ending Balance at Sep. 30, 2017 $ 569.1 $ 3.1 $ 63.7 $ 607.3 $ (105.0)
Ending Balance (in shares) at Sep. 30, 2017   30,710,443