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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)
$ in Millions
Total
Common Stock
Common Stock
Common Stock
Common Stock
Additional Paid-in Capital
Additional Paid-in Capital
Common Stock
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income
Noncontrolling Interests
Treasury Stock, Common
Beginning Balance at Dec. 31, 2020 $ 981.3   $ 1.4   $ 3,364.6   $ (1,273.3) $ 205.8 $ 51.7 $ (1,368.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 371.4           360.1   11.3  
Postretirement plans (net of $0.0 tax provisions in each period) 93.1             93.1    
Foreign currency translation adjustment (1.0)             (1.0)    
Share-based compensation for equity-classified awards 10.0       10.0          
Stock Issued During Period, Value, New Issues 101.9 $ 269.5 0.1 $ 0.3 101.8 $ 269.2        
Repurchase of employee common stock relinquished for tax withholding (1.4)                 (1.4)
Distributions to noncontrolling interests (4.0)               (4.0)  
Ending Balance at Dec. 31, 2021 1,820.8   1.8   3,745.6   (913.2) 297.9 59.0 (1,370.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 1,319.1           1,297.1   22.0  
Postretirement plans (net of $0.0 tax provisions in each period) (53.8)             (53.8)    
Foreign currency translation adjustment (1.6)             (1.6)    
Share-based compensation for equity-classified awards 8.4       8.4          
Stock Issued During Period, Value, New Issues 222.0     $ 0.1   $ 221.9        
Repurchase of employee common stock relinquished for tax withholding (2.6)                 (2.6)
Distributions to noncontrolling interests (17.5)               (17.5)  
Ending Balance at Dec. 31, 2022 3,294.8   1.9   3,975.9   383.9 242.5 63.5 (1,372.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income $ 815.6           759.6   56.0  
Dividends declared (in dollars per share) $ 0.225                  
Dividends declared $ 30.6       0.2   30.8      
Postretirement plans (net of $0.0 tax provisions in each period) (53.8)             (53.8)    
Foreign currency translation adjustment 0.9             0.9    
Share-based compensation for equity-classified awards 6.9       6.9          
Common stock repurchases (347.7)                 (347.7)
Net change in unsettled common stock repurchases (2.6)                 (2.6)
Excise tax accrued on common stock repurchases 3.3                 3.3
Repurchase of employee common stock relinquished for tax withholding (13.7)                 (13.7)
Distributions to noncontrolling interests (59.0)               (59.0)  
Ending Balance at Dec. 31, 2023 $ 3,607.5   $ 1.9   $ 3,983.0   $ 1,112.7 $ 189.6 $ 60.5 $ (1,740.2)