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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Treasury Stock
Balance at beginning of period (shares) at Dec. 31, 2021   388.0        
Balance at beginning of period at Dec. 31, 2021 $ 2,042.1 $ 0.4 $ 2,108.7 $ 0.5 $ 138.7 $ (206.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (shares)   1.4        
Issuance of common stock under equity incentive plans 0.0          
Issuance of common stock for Employee Stock Purchase Plan (shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan 10.1   10.1      
Issuance of common stock in connection with achievement of regulatory approval milestone, net of issuance costs (shares)   2.9        
Issuance of common stock in connection with achievement of regulatory approval milestone, net of issuance costs (0.1)   (189.3)     189.2
Conversions of 2023 Notes (shares)   0.4        
Conversions of 2023 Notes 17.4   4.2     13.2
Benefit of note hedge upon conversions of 2023 Notes (shares)   0.3        
Benefit of note hedge upon conversions of 2023 Notes 0.0   33.5     (33.5)
Share-based compensation expense 29.1   29.1      
Net income 97.3       97.3  
Other comprehensive income (loss), net of tax (6.6)     (6.6)    
Balance at end of period (shares) at Mar. 31, 2022   392.5        
Balance at end of period at Mar. 31, 2022 2,189.3 $ 0.4 1,996.3 (6.1) 236.0 (37.3)
Balance at beginning of period (shares) at Dec. 31, 2021   388.0        
Balance at beginning of period at Dec. 31, 2021 $ 2,042.1 $ 0.4 2,108.7 0.5 138.7 (206.2)
Balance at end of period (shares) at Dec. 31, 2022 386.3 386.3        
Balance at end of period at Dec. 31, 2022 $ 2,131.8 $ 0.4 2,258.1 (11.6) 479.9 (595.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (shares)   1.1        
Issuance of common stock under equity incentive plans 0.0          
Issuance of common stock for Employee Stock Purchase Plan (shares)   0.2        
Issuance of common stock for Employee Stock Purchase Plan 12.3   12.3      
Share-based compensation expense 35.2   35.2      
Net income 48.6       48.6  
Other comprehensive income (loss), net of tax $ 5.1     5.1    
Balance at end of period (shares) at Mar. 31, 2023 387.6 387.6        
Balance at end of period at Mar. 31, 2023 $ 2,233.0 $ 0.4 $ 2,305.6 $ (6.5) $ 528.5 $ (595.0)