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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative effects of change in accounting standards
Common Stock Issued
Additional Paid-In Capital
Retained Earnings
Retained Earnings
Cumulative effects of change in accounting standards
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive (Loss) Income
Cumulative effects of change in accounting standards
Balance (in shares) at Dec. 31, 2017     30,711,299          
Balance at Dec. 31, 2017 $ 546.7 $ (1.7) $ 3.1 $ 66.3 $ 566.7 $ 3.2 $ (89.4) $ (4.9)
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 $ (0.3) $ 3.1 71.1 608.2 $ (0.3) (124.5) $ (4.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 85.8       85.8      
Other comprehensive income (loss), net of tax 1.9           1.9  
Dividends declared (54.4)       (54.4)      
Restricted stock issuances, net (in shares)     147,113          
Restricted stock issuances, net 0.0              
Stock-based employee compensation expense 7.6     7.6        
Stock issued to directors as compensation (in shares)     3,601          
Stock issued to directors as compensation 0.1     0.1        
Purchases and cancellation of common stock (in shares)     (25,297)          
Purchases and cancellation of common stock (0.9)       (0.9)      
Balance (in shares) at Dec. 31, 2019     30,896,661          
Balance at Dec. 31, 2019 597.7   $ 3.1 78.8 638.4   (122.6)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 83.8       83.8      
Other comprehensive income (loss), net of tax 10.7           10.7  
Dividends declared (55.0)       (55.0)      
Restricted stock issuances, net (in shares)     302,705          
Restricted stock issuances, net 0.0              
Stock-based employee compensation expense 8.6     8.6        
Modification to director stock-based compensation 4.0     4.0        
Stock issued to directors as compensation (in shares)     3,689          
Stock issued to directors as compensation 0.8     0.8        
Deferred compensation directors stock trust (in shares)     149,469          
Purchases and cancellation of common stock (in shares)     (27,779)          
Purchases and cancellation of common stock (1.0)       (1.0)      
Balance (in shares) at Dec. 31, 2020     31,324,745          
Balance at Dec. 31, 2020 $ 649.6   $ 3.1 $ 92.2 $ 666.2   $ (111.9)