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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
1.00% Notes
Convertible Debt
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-in Capital
Additional Paid-in Capital
1.00% Notes
Convertible Debt
Additional Paid-in Capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Accumulated (Deficit) Earnings
Accumulated (Deficit) Earnings
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock
Treasury Stock
1.00% Notes
Convertible Debt
Non-Controlling Interest
Balance, beginning (in shares) at Dec. 31, 2017       551,873,115             126,754,921    
Balance, beginning at Dec. 31, 2017 $ 2,801.0     $ 5.5 $ 3,593.5     $ (40.6) $ 351.5   $ (1,131.1)   $ 22.2
Balance, beginning (Accounting Standards Update 2016-16) at Dec. 31, 2017     $ (1.4)             $ (1.4)      
Balance, beginning (Accounting Standards Update 2014-09) at Dec. 31, 2017     $ 2.1       $ 0.0     $ 2.1      
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)    
Payment of tax withholding for RSUs (31.6)                   $ (31.6)    
Share-based compensation $ 78.3       78.3                
Repurchase of common stock (in shares) (16,800,000)                   (16,768,511)    
Repurchase of common stock and repurchases of shares under bond hedges $ (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)       266,363                  
Stock option exercises 1.7     $ 0.0 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)    
Payment of tax withholding for RSUs (33.5)                   $ (33.5)    
Share-based compensation $ 79.4       79.4                
Repurchase of common stock (in shares) (7,800,000)                   (7,762,007)    
Repurchase of common stock and repurchases of shares under bond hedges $ (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
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Stock option exercises (in shares)       5,625                  
Stock option exercises 0.0       0.0                
Shares issued pursuant to the employee stock purchase plan (in shares)       1,838,256                  
Shares issued pursuant to the ESPP 23.6       23.6                
RSUs and stock grant awards issued (in shares)       3,359,951                  
RSUs and stock grant awards issued 0.0     $ 0.0 0.0                
Shares withheld for employee taxes on RSUs (in shares)                     (1,062,377)    
Payment of tax withholding for RSUs (20.0)                   $ (20.0)    
Share-based compensation $ 67.7       67.7                
Repurchase of common stock (in shares) (3,600,000)                   (3,611,413) (11,823,348)  
Repurchase of common stock and repurchases of shares under bond hedges $ (65.4) $ 0.0       $ 321.0         $ (65.4) $ (321.0)  
Dividend to non-controlling shareholder (5.0)                       (5.0)
Shares issued to settle excess over principal for 1.00% Notes 0.0       (88.7)           $ 88.7    
Shares issued to settle excess over principal for 1.00% Notes (in shares)                     11,823,271    
Comprehensive income 233.1             (3.3) 234.2       2.2
Balance, ending (in shares) at Dec. 31, 2020       570,766,439             158,923,810    
Balance, ending at Dec. 31, 2020 $ 3,558.1     $ 5.7 $ 4,133.1     $ (57.6) $ 1,425.5   $ (1,968.2)   $ 19.6