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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 Income (Loss)
Retained Earnings
Treasury Stock
Balance at beginning of period (shares) at Dec. 31, 2020 [1]   384.4        
Balance at beginning of period at Dec. 31, 2020 [1] $ 1,551.9 $ 0.4 $ 1,726.5 $ 3.2 $ (78.2) $ (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (shares)   2.8        
Issuance of common stock for Employee Stock Purchase Plan (shares)   0.2        
Issuance of common stock for Employee Stock Purchase Plan 20.3   20.3      
Conversions of 2023 Notes (shares)   0.8        
Conversions of 2023 Notes 32.3   26.7     5.6
Benefit of note hedge upon conversions of 2023 Notes (shares)   (0.5)        
Benefit of note hedge upon conversions of 2023 Notes     65.1     (65.1)
Share-based compensation expense 87.1   87.1      
Net income 222.2 [2],[3]       222.2  
Other comprehensive loss, net of tax (1.8) [4]     (1.8)    
Balance at beginning of period (shares) at Sep. 30, 2021 [1],[5]   387.7        
Balance at end of period at Sep. 30, 2021 [1],[5] 1,912.0 $ 0.4 1,925.7 1.4 144.0 (159.5)
Balance at beginning of period (shares) at Dec. 31, 2020 [1]   384.4        
Balance at beginning of period at Dec. 31, 2020 [1] $ 1,551.9 $ 0.4 1,726.5 3.2 (78.2) (100.0)
Balance at beginning of period (shares) at Dec. 31, 2021 388.0 388.0 [1]        
Balance at end of period at Dec. 31, 2021 [1] $ 2,042.1 $ 0.4 2,108.7 0.5 138.7 (206.2)
Balance at beginning of period (shares) at Jun. 30, 2021 [5]   387.0        
Balance at beginning of period at Jun. 30, 2021 [5] 1,754.7 $ 0.4 1,794.8 2.8 56.7 (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (shares)   0.3        
Issuance of common stock for Employee Stock Purchase Plan (shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan 11.6   11.6      
Conversions of 2023 Notes (shares)   0.8        
Conversions of 2023 Notes 32.3   26.7     5.6
Benefit of note hedge upon conversions of 2023 Notes (shares)   (0.5)        
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 87.3 [2],[4]       87.3  
Other comprehensive loss, net of tax (1.4) [4]     (1.4)    
Balance at beginning of period (shares) at Sep. 30, 2021 [1],[5]   387.7        
Balance at end of period at Sep. 30, 2021 [1],[5] $ 1,912.0 $ 0.4 1,925.7 1.4 144.0 (159.5)
Balance at beginning of period (shares) at Dec. 31, 2021 388.0 388.0 [1]        
Balance at beginning of period at Dec. 31, 2021 [1] $ 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)   1.5        
Issuance of common stock for Employee Stock Purchase Plan (shares)   0.3        
Issuance of common stock for Employee Stock Purchase Plan 22.5   22.5      
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
Purchases of treasury stock (shares)   (6.6)        
Purchases of treasury stock (557.7)         (557.7)
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 92.5   92.5      
Net income 249.4       249.4  
Other comprehensive loss, net of tax $ (41.6)     (41.6)    
Balance at beginning of period (shares) at Sep. 30, 2022 386.2 386.2        
Balance at end of period at Sep. 30, 2022 $ 1,824.5 $ 0.4 2,072.1 (41.1) 388.1 (595.0)
Balance at beginning of period (shares) at Jun. 30, 2022   392.6        
Balance at beginning of period at Jun. 30, 2022 2,255.9 $ 0.4 2,028.9 (23.0) 286.9 (37.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock for Employee Stock Purchase Plan (shares)   0.2        
Issuance of common stock for Employee Stock Purchase Plan 12.4   12.4      
Purchases of treasury stock (shares)   (6.6)        
Purchases of treasury stock (557.7)         (557.7)
Share-based compensation expense 30.8   30.8      
Net income 101.2       101.2  
Other comprehensive loss, net of tax $ (18.1)     (18.1)    
Balance at beginning of period (shares) at Sep. 30, 2022 386.2 386.2        
Balance at end of period at Sep. 30, 2022 $ 1,824.5 $ 0.4 $ 2,072.1 $ (41.1) $ 388.1 $ (595.0)
[1] * We adjusted our 2021 amounts to reflect the simplified convertible instruments accounting guidance, which we adopted on a full retrospective basis. All periods presented have been adjusted to reflect the four-for-one stock split. Refer to Note 1, “Organization and Significant Accounting Policies,” for further information.
[2] * We adjusted our 2021 amounts to reflect the simplified convertible instruments accounting guidance, which we adopted on a full retrospective basis. All periods presented have also been adjusted to reflect the four-for-one stock split. Refer to Note 1, “Organization and Significant Accounting Policies,” for further information.
[3] * We adjusted our 2021 amounts to reflect the simplified convertible instruments accounting guidance, which we adopted on a full retrospective basis. Refer to Note 1, “Organization and Significant Accounting Policies,” for further information.
[4] * We adjusted our 2021 amounts to reflect the simplified convertible instruments accounting guidance, which we adopted on a full retrospective basis. Refer to Note 1, “Organization and Significant Accounting Policies,” for further information.
[5] * We adjusted our 2021 amounts to reflect the simplified convertible instruments accounting guidance, which we adopted on a full retrospective basis. All periods presented have also been adjusted to reflect the four-for-one stock split. Refer to Note 1, “Organization and Significant Accounting Policies,” for further information.