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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional paid-in capital
Treasury stock
Accumulated deficit
Accumulated other comprehensive income
Noncontrolling interests
Balance, beginning of period at Dec. 31, 2020   $ 1.4 $ 3,364.6 $ (1,368.9) $ (1,273.3) $ 205.8 $ 51.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensation for equity-classified awards     3.9        
Common stock issuances, net of costs     64.8        
Net income (loss) $ (105.0)       (108.7)   3.7
Repurchase of employee common stock relinquished for tax withholding 1.3     (1.3)      
Postretirement plans (net of $0.0 tax provisions in each period) (22.0)         (22.0)  
Foreign currency translation adjustment (0.4)         (0.4)  
Distributions to noncontrolling interests             (0.1)
Common stock issuances, net of costs   0.1          
Balance, end of period at Jun. 30, 2021 951.8 1.5 3,463.8 (1,370.2) (1,382.0) 183.4 55.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock issued in exchange for debt retirement     30.5        
Balance, beginning of period at Mar. 31, 2021   1.4 3,366.4 (1,369.5) (1,353.4) 194.6 52.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensation for equity-classified awards     2.1        
Common stock issuances, net of costs     64.8        
Net income (loss) (25.3)       (28.6)   3.3
Repurchase of employee common stock relinquished for tax withholding       (0.7)      
Postretirement plans (net of $0.0 tax provisions in each period) (11.0)         (11.0)  
Foreign currency translation adjustment (0.2)         (0.2)  
Distributions to noncontrolling interests             0.0
Common stock issuances, net of costs   0.1          
Balance, end of period at Jun. 30, 2021 951.8 1.5 3,463.8 (1,370.2) (1,382.0) 183.4 55.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock issued in exchange for debt retirement     30.5        
Balance, beginning of period at Dec. 31, 2021 1,820.8 1.8 3,745.6 (1,370.3) (913.2) 297.9 59.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensation for equity-classified awards     5.4        
Common stock issuances, net of costs     221.9        
Net income (loss) 290.0       290.0   0.0
Repurchase of employee common stock relinquished for tax withholding 2.6     (2.6)      
Postretirement plans (net of $0.0 tax provisions in each period) (26.9)         (26.9)  
Foreign currency translation adjustment (1.5)         (1.5)  
Distributions to noncontrolling interests             (13.8)
Common stock issuances, net of costs   0.1          
Balance, end of period at Jun. 30, 2022 2,293.4 1.9 3,972.9 (1,372.9) (623.2) 269.5 45.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock issued in exchange for debt retirement     0.0        
Balance, beginning of period at Mar. 31, 2022   1.9 3,969.5 (1,372.3) (1,032.7) 286.4 44.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensation for equity-classified awards     3.4        
Common stock issuances, net of costs     0.0        
Net income (loss) 410.6       409.5   1.1
Repurchase of employee common stock relinquished for tax withholding       (0.6)      
Postretirement plans (net of $0.0 tax provisions in each period) (13.5)         (13.5)  
Foreign currency translation adjustment (3.4)         (3.4)  
Common stock issuances, net of costs   0.0          
Balance, end of period at Jun. 30, 2022 $ 2,293.4 $ 1.9 3,972.9 $ (1,372.9) $ (623.2) $ 269.5 $ 45.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock issued in exchange for debt retirement     $ 0.0