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Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Retained earnings
Total Accumulated Other Comprehensive Income
Noncontrolling Interest
Balance, beginning of period at Dec. 31, 2018   $ 1.4 $ 3,304.7 $ (1,025.1) $ 1,074.5 $ 40.1 $ 56.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividend equivalent units on dividends declared     7.4        
Share-based compensation for equity-classified awards     21.6        
Common stock repurchases $ 156.0     (156.0)      
Repurchase of employee common stock relinquished for tax withholding 12.3     (12.3)      
Net (loss) income 161.3       161.3    
Dividends declared ($0.000, $0.140, $0.000, and $2.120 per share, respectively)         (236.7)    
Postretirement plans and workers' compensation obligations (net of $0.0 tax provisions in each period)           (4.4)  
Foreign currency translation adjustment (0.4)         (0.4)  
Net (loss) income 169.4           8.1
Distributions to noncontrolling interests             (14.4)
Balance, end of period at Jun. 30, 2019 3,225.8 1.4 3,333.7 (1,193.4) 999.1 35.3 49.7
Balance, beginning of period at Mar. 31, 2019   1.4 3,322.3 (1,125.3) 978.3 38.0 47.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividend equivalent units on dividends declared     1.4        
Share-based compensation for equity-classified awards     10.0        
Common stock repurchases       (57.2)      
Repurchase of employee common stock relinquished for tax withholding       (10.9)      
Net (loss) income 37.1       37.1    
Dividends declared ($0.000, $0.140, $0.000, and $2.120 per share, respectively)         (16.3)    
Postretirement plans and workers' compensation obligations (net of $0.0 tax provisions in each period)           (2.2)  
Foreign currency translation adjustment (0.5)         (0.5)  
Net (loss) income 39.5           2.4
Distributions to noncontrolling interests             (0.1)
Balance, end of period at Jun. 30, 2019 3,225.8 1.4 3,333.7 (1,193.4) 999.1 35.3 49.7
Balance, beginning of period at Dec. 31, 2019 2,672.5 1.4 3,351.1 (1,367.3) 597.0 31.6 58.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividend equivalent units on dividends declared     0.0        
Share-based compensation for equity-classified awards     6.1        
Common stock repurchases 0.0     0.0      
Repurchase of employee common stock relinquished for tax withholding 1.6     (1.6)      
Net (loss) income (1,673.9)       (1,673.9)    
Dividends declared ($0.000, $0.140, $0.000, and $2.120 per share, respectively)         0.0    
Postretirement plans and workers' compensation obligations (net of $0.0 tax provisions in each period)           (4.4)  
Foreign currency translation adjustment (0.7)         (0.7)  
Net (loss) income (1,679.1)           (5.2)
Distributions to noncontrolling interests             (3.5)
Balance, end of period at Jun. 30, 2020 989.3 1.4 3,357.2 (1,368.9) (1,076.9) 26.5 50.0
Balance, beginning of period at Mar. 31, 2020   1.4 3,353.3 (1,368.1) 467.3 22.6 56.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Share-based compensation for equity-classified awards     3.9        
Common stock repurchases       0.0      
Repurchase of employee common stock relinquished for tax withholding       (0.8)      
Net (loss) income (1,544.2)       (1,544.2)    
Dividends declared ($0.000, $0.140, $0.000, and $2.120 per share, respectively)         0.0    
Postretirement plans and workers' compensation obligations (net of $0.0 tax provisions in each period)           (2.2)  
Foreign currency translation adjustment 6.1         6.1  
Net (loss) income (1,547.6)           (3.4)
Distributions to noncontrolling interests             (3.4)
Balance, end of period at Jun. 30, 2020 $ 989.3 $ 1.4 $ 3,357.2 $ (1,368.9) $ (1,076.9) $ 26.5 $ 50.0