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Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Treasury Stock
Retained earnings
Total Accumulated Other Comprehensive Income
Noncontrolling Interest
Balance, beginning of period at Dec. 31, 2017   $ 576.0 $ 1.0 $ 2,590.3 $ (175.9) $ 613.6 $ 1.4 $ 49.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Impact of adoption of Accounting Standards Update 2014-09           (22.5)    
Net income $ 106.6         209.1    
Dividends declared       0.4   (15.4)    
Series A Convertible Preferred Stock conversions   (576.0) 0.4 678.1   (102.5)    
Share-based compensation for equity-classified awards       8.1        
Common stock repurchases 175.5       (175.5)      
Repurchase of employee common stock relinquished for tax withholding 0.0       0.0      
Net income (loss) 207.0             (2.1)
Distributions to noncontrolling interests               (6.6)
Postretirement plans and workers' compensation obligations (net of respective tax provision of $0.0 and $0.0) 0.0           0.0  
Foreign currency translation adjustment (0.8)           (0.8)  
Balance, end of period at Mar. 31, 2018 3,650.5 0.0 1.4 3,276.9 (351.4) 682.3 0.6 40.7
Balance, beginning of period at Dec. 31, 2018 3,451.6 0.0 1.4 3,304.7 (1,025.1) 1,074.5 40.1 56.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Impact of adoption of Accounting Standards Update 2014-09           0.0    
Net income 124.2         124.2    
Dividends declared       6.0   (220.4)    
Series A Convertible Preferred Stock conversions   0.0 0.0 0.0   0.0    
Share-based compensation for equity-classified awards       11.6        
Common stock repurchases 98.8       (98.8)      
Repurchase of employee common stock relinquished for tax withholding 1.4       (1.4)      
Net income (loss) 129.9             5.7
Distributions to noncontrolling interests               (14.3)
Postretirement plans and workers' compensation obligations (net of respective tax provision of $0.0 and $0.0) 2.2           (2.2)  
Foreign currency translation adjustment 0.1           0.1  
Balance, end of period at Mar. 31, 2019 $ 3,262.1 $ 0.0 $ 1.4 $ 3,322.3 $ (1,125.3) $ 978.3 $ 38.0 $ 47.4