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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 Loss
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 (loss) 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 (loss) 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)
Beginning Balance (in shares) at Dec. 31, 2022 54,929,973 54,929,973      
Beginning Balance at Dec. 31, 2022 $ 1,179.3 $ 5.5 658.5 610.7 (95.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) (12.2)     (12.2)  
Other comprehensive income (loss), net of tax 22.0       22.0
Dividends declared (44.5)     (44.5)  
Restricted stock issuances, net (in shares)   (21,927)      
Stock options exercised (in shares)   813      
Stock-based employee compensation expense 6.7   6.7    
Stock issued to directors as compensation (in shares)   6,726      
Stock issued to directors as compensation 0.5   0.5    
Purchases and retirement of common stock (in shares)   (118,779)      
Purchases and retirement of common stock $ (2.8)     (2.8)  
Ending Balance (in shares) at Jun. 30, 2023 54,840,660 54,840,660      
Ending Balance at Jun. 30, 2023 $ 1,149.0 $ 5.5 665.7 551.2 (73.4)
Beginning Balance (in shares) at Mar. 31, 2023   54,919,923      
Beginning Balance at Mar. 31, 2023 1,159.3 $ 5.5 662.4 579.3 (87.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) (4.5)     (4.5)  
Other comprehensive income (loss), net of tax 14.5       14.5
Dividends declared (22.1)     (22.1)  
Restricted stock issuances, net (in shares)   (18,237)      
Stock-based employee compensation expense 3.0   3.0    
Stock issued to directors as compensation (in shares)   3,318      
Stock issued to directors as compensation 0.3   0.3    
Purchases and retirement of common stock (in shares)   (64,344)      
Purchases and retirement of common stock $ (1.5)     (1.5)  
Ending Balance (in shares) at Jun. 30, 2023 54,840,660 54,840,660      
Ending Balance at Jun. 30, 2023 $ 1,149.0 $ 5.5 $ 665.7 $ 551.2 $ (73.4)