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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2019   91.6        
Balance at beginning of period at Dec. 31, 2019 $ 882.6 $ 0.1 $ 1,675.9 $ 2.3 $ (695.7) $ (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   1.0        
Issuance of common stock under equity incentive plans 0.3   0.3      
Issuance of common stock for Employee Stock Purchase Plan 15.0   15.0      
Equity component of 2025 Notes issuance, net of issuance costs 289.4   289.4      
Repurchase and conversions of Notes (in shares)   3.4        
Repurchase and conversions of Notes 87.8   87.8      
Share-based compensation expense 85.3   85.3      
Net income 138.4       138.4  
Other comprehensive income (loss), net of tax 0.5     0.5    
Balance at end of period (in shares) at Sep. 30, 2020   96.0        
Balance at end of period at Sep. 30, 2020 1,499.3 $ 0.1 2,153.7 2.8 (557.3) (100.0)
Balance at beginning of period (in shares) at Jun. 30, 2020   95.4        
Balance at beginning of period at Jun. 30, 2020 1,353.9 $ 0.1 2,079.8 3.5 (629.5) (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   0.2        
Issuance of common stock under equity incentive plans 0.0          
Issuance of common stock for Employee Stock Purchase Plan 8.6   8.6      
Repurchase and conversions of Notes (in shares)   0.4        
Repurchase and conversions of Notes 34.6   34.6      
Share-based compensation expense 30.7   30.7      
Net income 72.2       72.2  
Other comprehensive income (loss), net of tax (0.7)     (0.7)    
Balance at end of period (in shares) at Sep. 30, 2020   96.0        
Balance at end of period at Sep. 30, 2020 1,499.3 $ 0.1 2,153.7 2.8 (557.3) (100.0)
Balance at beginning of period (in shares) at Dec. 31, 2020   96.1        
Balance at beginning of period at Dec. 31, 2020 1,826.5 $ 0.1 2,125.3 3.2 (202.1) (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   0.7        
Issuance of common stock for Employee Stock Purchase Plan 20.3   20.3      
Repurchase and conversions of Notes (in shares)   0.2        
Repurchase and conversions of Notes 29.9   24.3     5.6
Benefit of note hedge upon conversions of 2023 Notes (in shares)   (0.1)        
Benefit of note hedge upon conversions of 2023 Notes 0.0   65.1     (65.1)
Share-based compensation expense 87.1   87.1      
Net income 174.1       174.1  
Other comprehensive income (loss), net of tax (1.8)     (1.8)    
Balance at end of period (in shares) at Sep. 30, 2021   96.9        
Balance at end of period at Sep. 30, 2021 2,136.1 $ 0.1 2,322.1 1.4 (28.0) (159.5)
Balance at beginning of period (in shares) at Jun. 30, 2021   96.7        
Balance at beginning of period at Jun. 30, 2021 1,997.6 $ 0.1 2,193.6 2.8 (98.9) (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   0.1        
Issuance of common stock under equity incentive plans 0.0          
Issuance of common stock for Employee Stock Purchase Plan 11.6   11.6      
Repurchase and conversions of Notes (in shares)   0.2        
Repurchase and conversions of Notes 29.9   24.3     5.6
Benefit of note hedge upon conversions of 2023 Notes (in shares)   (0.1)        
Benefit of note hedge upon conversions of 2023 Notes 0.0   65.1     (65.1)
Share-based compensation expense 27.5   27.5      
Net income 70.9       70.9  
Other comprehensive income (loss), net of tax (1.4)     (1.4)    
Balance at end of period (in shares) at Sep. 30, 2021   96.9        
Balance at end of period at Sep. 30, 2021 $ 2,136.1 $ 0.1 $ 2,322.1 $ 1.4 $ (28.0) $ (159.5)