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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 loss (9.1)     (9.1)  
Other comprehensive income (loss), net of tax (38.9)       (38.9)
Dividends paid (50.1)     (50.1)  
Restricted stock issuances, net (in shares)   875,149      
Restricted stock issuances, net 0.0 $ 0.1 (0.1)    
Stock-based employee compensation expense 16.5   16.5    
Stock issued to directors as compensation (in shares)   5,779      
Stock issued to directors as compensation 0.8   0.8    
Deferred compensation directors stock trust (in shares)   60,899      
Purchases and retirement of common stock (in shares)   (254,662)      
Purchases and retirement of common stock (6.4)     (6.4)  
Issuance of shares related to Merger (in shares)   22,814,562      
Issuance of shares related to Merger 537.9 $ 2.3 535.6    
Ending balance (in shares) at Sep. 30, 2022   54,951,290      
Ending balance at Sep. 30, 2022 1,132.9 $ 5.5 654.5 630.8 (157.9)
Beginning balance (in shares) at Jun. 30, 2022   31,922,911      
Beginning balance at Jun. 30, 2022 694.5 $ 3.1 109.2 678.7 (96.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (22.5)     (22.5)  
Other comprehensive income (loss), net of tax (61.4)       (61.4)
Dividends paid (22.0)     (22.0)  
Restricted stock issuances, net (in shares)   368,123      
Restricted stock issuances, net 0.0 $ 0.1 (0.1)    
Stock-based employee compensation expense 9.5   9.5    
Stock issued to directors as compensation (in shares)   4,122      
Stock issued to directors as compensation 0.3   0.3    
Purchases and retirement of common stock (in shares)   (158,428)      
Purchases and retirement of common stock (3.4)     (3.4)  
Issuance of shares related to Merger (in shares)   22,814,562      
Issuance of shares related to Merger 537.9 $ 2.3 535.6    
Ending balance (in shares) at Sep. 30, 2022   54,951,290      
Ending balance at Sep. 30, 2022 $ 1,132.9 $ 5.5 654.5 630.8 (157.9)
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 loss (467.2)     (467.2)  
Other comprehensive income (loss), net of tax 8.4       8.4
Dividends paid (50.2)     (50.2)  
Restricted stock issuances, net (in shares)   (86,814)      
Stock options exercised (in shares)   813      
Stock-based employee compensation expense 9.1   9.1    
Stock issued to directors as compensation (in shares)   11,436      
Stock issued to directors as compensation 0.7   0.7    
Purchases and retirement of common stock (in shares)   (400,699)      
Purchases and retirement of common stock $ (7.1) $ (0.1)   (7.0)  
Ending balance (in shares) at Sep. 30, 2023 54,454,709 54,454,709      
Ending balance at Sep. 30, 2023 $ 673.0 $ 5.4 668.3 86.3 (87.0)
Beginning balance (in shares) at Jun. 30, 2023   54,840,660      
Beginning balance at Jun. 30, 2023 1,149.0 $ 5.5 665.7 551.2 (73.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (455.0)     (455.0)  
Other comprehensive income (loss), net of tax (13.6)       (13.6)
Dividends paid (5.7)     (5.7)  
Restricted stock issuances, net (in shares)   (108,741)      
Stock-based employee compensation expense 2.4   2.4    
Stock issued to directors as compensation (in shares)   4,710      
Stock issued to directors as compensation 0.2   0.2    
Purchases and retirement of common stock (in shares)   (281,920)      
Purchases and retirement of common stock $ (4.3) $ (0.1)   (4.2)  
Ending balance (in shares) at Sep. 30, 2023 54,454,709 54,454,709      
Ending balance at Sep. 30, 2023 $ 673.0 $ 5.4 $ 668.3 $ 86.3 $ (87.0)