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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock Issued
Additional Paid-In Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2018     30,771,244        
Beginning Balance at Dec. 31, 2018 $ 557.9 $ (0.3) $ 3.1 $ 71.1 $ 608.2 $ (0.3) $ (124.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 65.6       65.6    
Other comprehensive income (loss), net of tax (10.6)           (10.6)
Dividends declared (40.8)       (40.8)    
Restricted stock issuances, net (in shares)     147,019        
Stock-based employee compensation expense 3.9     3.9      
Stock issued to directors as compensation (in shares)     3,034        
Stock issued to directors as compensation 0.1     0.1      
Purchases and retirement of common stock (in shares)     (25,297)        
Purchases and retirement of common stock (1.0)       (1.0)    
Ending Balance at Sep. 30, 2019 574.8   $ 3.1 75.1 631.7   (135.1)
Ending Balance (in shares) at Sep. 30, 2019     30,896,000        
Beginning Balance (in shares) at Jun. 30, 2019     30,894,598        
Beginning Balance at Jun. 30, 2019 572.6   $ 3.1 73.6 617.6   (121.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 27.7       27.7    
Other comprehensive income (loss), net of tax (13.4)           (13.4)
Dividends declared (13.6)       (13.6)    
Restricted stock issuances, net (in shares)     914        
Stock-based employee compensation expense 1.5     1.5      
Stock issued to directors as compensation (in shares)     640        
Purchases and retirement of common stock (in shares)     (152)        
Ending Balance at Sep. 30, 2019 574.8   $ 3.1 75.1 631.7   (135.1)
Ending Balance (in shares) at Sep. 30, 2019     30,896,000        
Beginning Balance (in shares) at Dec. 31, 2019     30,896,661        
Beginning Balance at Dec. 31, 2019 597.7   $ 3.1 78.8 638.4   (122.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 68.5       68.5    
Other comprehensive income (loss), net of tax (5.6)           (5.6)
Dividends declared (41.2)       (41.2)    
Restricted stock issuances, net (in shares)     299,926        
Stock-based employee compensation expense 5.5     5.5      
Modification to director stock-based compensation plan 4.0     4.0      
Stock issued to directors as compensation (in shares)     151,667        
Stock issued to directors as compensation 0.5     0.5      
Purchases and retirement of common stock (in shares)     (26,479)        
Purchases and retirement of common stock (0.9)       (0.9)    
Ending Balance at Sep. 30, 2020 628.5   $ 3.1 88.8 664.8   (128.2)
Ending Balance (in shares) at Sep. 30, 2020     31,321,775        
Beginning Balance (in shares) at Jun. 30, 2020     31,195,009        
Beginning Balance at Jun. 30, 2020 607.4   $ 3.1 87.2 654.1   (137.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 24.5       24.5    
Other comprehensive income (loss), net of tax 8.8           8.8
Dividends declared (13.8)       (13.8)    
Restricted stock issuances, net (in shares)     (21,932)        
Stock-based employee compensation expense 1.4     1.4      
Stock issued to directors as compensation (in shares)     149,469        
Stock issued to directors as compensation 0.2     0.2      
Purchases and retirement of common stock (in shares)     (771)        
Ending Balance at Sep. 30, 2020 $ 628.5   $ 3.1 $ 88.8 $ 664.8   $ (128.2)
Ending Balance (in shares) at Sep. 30, 2020     31,321,775