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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) retained earnings
Total Accumulated Other Comprehensive Income
Noncontrolling interests
Balance, beginning of period at Dec. 31, 2019   $ 1.4 $ 3,351.1 $ (1,367.3) $ 597.0 $ 31.6 $ 58.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensation for equity-classified awards     9.9        
Common stock issued in exchange for debt retirement     0.0        
Common stock issuances, net of costs     0.0        
Net loss $ (1,746.2)       (1,741.1)   (5.1)
Repurchase of employee common stock relinquished for tax withholding 1.6     (1.6)      
Postretirement plans (net of $0.0 tax provisions in each period) 167.9         167.9  
Foreign currency translation adjustment 1.8         1.8  
Distributions to noncontrolling interests             (3.5)
Common stock issuances, net of costs   0.0          
Balance, end of period at Sep. 30, 2020 1,100.8 1.4 3,361.0 (1,368.9) (1,144.1) 201.3 50.1
Balance, beginning of period at Jun. 30, 2020   1.4 3,357.2 (1,368.9) (1,076.9) 26.5 50.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensation for equity-classified awards     3.8        
Common stock issued in exchange for debt retirement     0.0        
Common stock issuances, net of costs     0.0        
Net loss (67.1)       (67.2)   0.1
Repurchase of employee common stock relinquished for tax withholding       0.0      
Postretirement plans (net of $0.0 tax provisions in each period) 172.3         172.3  
Foreign currency translation adjustment 2.5         2.5  
Distributions to noncontrolling interests             0.0
Common stock issuances, net of costs   0.0          
Balance, end of period at Sep. 30, 2020 1,100.8 1.4 3,361.0 (1,368.9) (1,144.1) 201.3 50.1
Balance, beginning of period at Dec. 31, 2020 981.3 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     5.6        
Common stock issued in exchange for debt retirement     58.2        
Common stock issuances, net of costs     176.7        
Net loss (140.3)       (152.9)   12.6
Repurchase of employee common stock relinquished for tax withholding 1.3     (1.3)      
Postretirement plans (net of $0.0 tax provisions in each period)           (33.0)  
Foreign currency translation adjustment (1.2)         (1.2)  
Distributions to noncontrolling interests             (3.9)
Common stock issuances, net of costs   0.2          
Balance, end of period at Sep. 30, 2021 1,042.3 1.6 3,605.1 (1,370.2) (1,426.2) 171.6 60.4
Balance, beginning of period at Jun. 30, 2021   1.5 3,463.8 (1,370.2) (1,382.0) 183.4 55.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensation for equity-classified awards     1.7        
Common stock issued in exchange for debt retirement     27.7        
Common stock issuances, net of costs     111.9        
Net loss (35.3)       (44.2)   8.9
Repurchase of employee common stock relinquished for tax withholding       0.0      
Postretirement plans (net of $0.0 tax provisions in each period)           (11.0)  
Foreign currency translation adjustment (0.8)         (0.8)  
Distributions to noncontrolling interests             (3.8)
Common stock issuances, net of costs   0.1          
Balance, end of period at Sep. 30, 2021 $ 1,042.3 $ 1.6 $ 3,605.1 $ (1,370.2) $ (1,426.2) $ 171.6 $ 60.4