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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2020   31,324,745      
Beginning Balance at Dec. 31, 2020 $ 649.6 $ 3.1 $ 92.2 $ 666.2 $ (111.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 23.4     23.4  
Other comprehensive income (loss) net of tax 5.6       5.6
Dividends declared (27.6)     (27.6)  
Restricted stock issuances, net (in shares)   168,096      
Stock-based employee compensation expense 4.6   4.6    
Stock issued to directors as compensation (in shares)   1,074      
Stock issued to directors as compensation 0.5   0.5    
Purchases and retirement of common stock (in shares)   (67,786)      
Purchases and retirement of common stock (3.1)     (3.1)  
Ending Balance (in shares) at Jun. 30, 2021   31,426,129      
Ending Balance at Jun. 30, 2021 653.0 $ 3.1 97.3 658.9 (106.3)
Beginning Balance (in shares) at Mar. 31, 2021   31,407,136      
Beginning Balance at Mar. 31, 2021 652.9 $ 3.1 94.6 670.9 (115.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 1.8     1.8  
Other comprehensive income (loss) net of tax 9.4       9.4
Dividends declared (13.8)     (13.8)  
Restricted stock issuances, net (in shares)   19,566      
Stock-based employee compensation expense 2.5   2.5    
Stock issued to directors as compensation (in shares)   484      
Stock issued to directors as compensation 0.2   0.2    
Purchases and retirement of common stock (in shares)   (1,057)      
Ending Balance (in shares) at Jun. 30, 2021   31,426,129      
Ending Balance at Jun. 30, 2021 653.0 $ 3.1 97.3 658.9 (106.3)
Beginning Balance (in shares) at Dec. 31, 2021   31,449,563      
Beginning Balance at Dec. 31, 2021 682.2 $ 3.1 101.7 696.4 (119.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 13.4     13.4  
Other comprehensive income (loss) net of tax 22.5       22.5
Dividends declared (28.1)     (28.1)  
Restricted stock issuances, net (in shares)   507,026      
Stock-based employee compensation expense 7.0   7.0    
Stock issued to directors as compensation (in shares)   1,657      
Stock issued to directors as compensation 0.5   0.5    
Deferred compensation directors stock trust (in shares)   60,899      
Purchases and retirement of common stock (in shares)   (96,234)      
Purchases and retirement of common stock (3.0)     (3.0)  
Ending Balance (in shares) at Jun. 30, 2022   31,922,911      
Ending Balance at Jun. 30, 2022 694.5 $ 3.1 109.2 678.7 (96.5)
Beginning Balance (in shares) at Mar. 31, 2022   31,705,664      
Beginning Balance at Mar. 31, 2022 701.4 $ 3.1 105.4 681.2 (88.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 11.8     11.8  
Other comprehensive income (loss) net of tax (8.2)       (8.2)
Dividends declared (14.2)     (14.2)  
Restricted stock issuances, net (in shares)   156,872      
Stock-based employee compensation expense 3.6   3.6    
Stock issued to directors as compensation (in shares)   863      
Stock issued to directors as compensation 0.2   0.2    
Deferred compensation directors stock trust (in shares)   60,899      
Purchases and retirement of common stock (in shares)   (1,387)      
Purchases and retirement of common stock (0.1)     (0.1)  
Ending Balance (in shares) at Jun. 30, 2022   31,922,911      
Ending Balance at Jun. 30, 2022 $ 694.5 $ 3.1 $ 109.2 $ 678.7 $ (96.5)