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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 61.8     61.8  
Other comprehensive income (loss), net of tax 34.3       34.3
Dividends declared (38.7)     (38.7)  
Restricted stock issuances, net 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   0.2    
Stock issued to directors as compensation (in shares)   4,352      
Purchases and retirement of common stock (1.1)     (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      
Beginning Balance at Jun. 30, 2017 544.7 $ 3.1 61.5 594.5 (114.4)
Beginning Balance (in shares) at Jun. 30, 2017   30,706,861      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 25.8     25.8  
Other comprehensive income (loss), net of tax 9.4       9.4
Dividends declared (12.9)     (12.9)  
Restricted stock issuances, net 0.0        
Restricted stock issuances, net (in shares)   2,560      
Stock-based employee compensation expense 2.1   2.1    
Stock issued to directors as compensation 0.1   0.1    
Stock issued to directors as compensation (in shares)   1,611      
Purchases and retirement of common stock (0.1)     (0.1)  
Purchases and retirement of common stock (in shares)   (589)      
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      
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]          
Cumulative effects of changes in accounting standards (1.7)     (1.7)  
Net income 87.3     87.3  
Other comprehensive income (loss), net of tax (24.8)       (24.8)
Dividends declared (39.7)     (39.7)  
Restricted stock issuances, net 0.0        
Restricted stock issuances, net (in shares)   122,817      
Stock-based employee compensation expense 3.5   3.5    
Stock issued to directors as compensation 0.2   0.2    
Stock issued to directors as compensation (in shares)   3,615      
Purchases and retirement of common stock (2.8)     (2.8)  
Purchases and retirement of common stock (in shares)   (69,758)      
Ending Balance at Sep. 30, 2018 568.7 $ 3.1 70.0 609.8 (114.2)
Ending Balance (in shares) at Sep. 30, 2018   30,767,973      
Beginning Balance at Jun. 30, 2018 542.5 $ 3.1 68.8 582.2 (111.6)
Beginning Balance (in shares) at Jun. 30, 2018   30,754,759      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 41.0     41.0  
Other comprehensive income (loss), net of tax (2.6)       (2.6)
Dividends declared (13.3)     (13.3)  
Restricted stock issuances, net 0.0        
Restricted stock issuances, net (in shares)   14,663      
Stock-based employee compensation expense 1.1   1.1    
Stock issued to directors as compensation 0.1   0.1    
Stock issued to directors as compensation (in shares)   972      
Purchases and retirement of common stock (0.1)     (0.1)  
Purchases and retirement of common stock (in shares)   (2,421)      
Ending Balance at Sep. 30, 2018 $ 568.7 $ 3.1 $ 70.0 $ 609.8 $ (114.2)
Ending Balance (in shares) at Sep. 30, 2018   30,767,973