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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated (Deficit) Earnings
Treasury Stock
Non-Controlling Interest in Consolidated Subsidiary
Balance, beginning (in shares) at Dec. 31, 2016   542,317,788       (123,376,075)  
Balance, beginning at Dec. 31, 2016 $ 1,845.0 $ 5.4 $ 3,473.3 $ (50.2) $ (527.3) $ (1,078.0) $ 21.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock option exercises (in shares)   2,213,859          
Stock option exercises 18.0 $ 0.0 18.0        
Shares issued pursuant to the employee stock purchase plan (in shares)   1,913,528          
Shares issued pursuant to the ESPP 23.6   23.6        
RSUs and stock grant awards issued (in shares)   5,427,940          
RSUs and stock grant awards issued 0.0 $ 0.1 (0.1)        
Shares withheld for employee taxes on RSUs (in shares)           (1,750,182)  
Shares withheld for employee taxes on RSUs (28.1)         $ (28.1)  
Share-based compensation expense $ 69.8   69.8        
Repurchase of common stock (in shares) (1,600,000)         (1,628,664)  
Repurchase of common stock $ (25.0)         $ (25.0)  
Repayment of 2.625% Notes, Series B - Equity Portion (55.7)   (55.7)        
Dividend to non-controlling shareholder (1.9)           (1.9)
Warrants and bond hedge, net (59.5)   (59.5)        
Issuance of 2023 convertible notes 113.1   113.1        
Tax impact of 2023 convertible notes, warrants and bond hedge 11.0   11.0        
Comprehensive income 822.6     9.6 810.7   2.3
Balance, ending (in shares) at Dec. 31, 2017   551,873,115       (126,754,921)  
Balance, ending at Dec. 31, 2017 2,801.0 $ 5.5 3,593.5 (40.6) 351.5 $ (1,131.1) 22.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock option exercises (in shares)   794,165          
Stock option exercises 5.7 $ 0.0 5.7        
Shares issued pursuant to the employee stock purchase plan (in shares)   1,516,012          
Shares issued pursuant to the ESPP 24.9   24.9        
RSUs and stock grant awards issued (in shares)   4,518,328          
RSUs and stock grant awards issued 0.0 $ 0.1 (0.1)        
Shares withheld for employee taxes on RSUs (in shares)           (1,343,961)  
Shares withheld for employee taxes on RSUs (31.6)         $ (31.6)  
Share-based compensation expense $ 78.3   78.3        
Repurchase of common stock (in shares) (16,800,000)         (16,768,511)  
Repurchase of common stock $ (315.3)         $ (315.3)  
Dividend to non-controlling shareholder (2.2)           (2.2)
Comprehensive income 632.6     2.7 627.4   2.5
Balance, ending (in shares) at Dec. 31, 2018   558,701,620       (144,867,393)  
Balance, ending at Dec. 31, 2018 $ 3,194.1 $ 5.6 3,702.3 (37.9) 979.6 $ (1,478.0) 22.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock option exercises (in shares) 300,000 266,363          
Stock option exercises $ 1.7   1.7        
Shares issued pursuant to the employee stock purchase plan (in shares)   1,666,559          
Shares issued pursuant to the ESPP 26.2   26.2        
RSUs and stock grant awards issued (in shares)   4,928,065          
RSUs and stock grant awards issued 0.0 $ 0.1 (0.1)        
Shares withheld for employee taxes on RSUs (in shares)           (1,620,543)  
Shares withheld for employee taxes on RSUs (33.5)         $ (33.5)  
Share-based compensation expense $ 79.4   79.4        
Repurchase of common stock (in shares) (7,800,000)         (7,762,007)  
Repurchase of common stock $ (139.0)         $ (139.0)  
Dividend to non-controlling shareholder (2.3)           (2.3)
Comprehensive income 197.5     (16.4) 211.7   2.2
Balance, ending (in shares) at Dec. 31, 2019   565,562,607       (154,249,943)  
Balance, ending at Dec. 31, 2019 $ 3,324.1 $ 5.7 $ 3,809.5 $ (54.3) $ 1,191.3 $ (1,650.5) $ 22.4