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Organization and Significant Accounting Policies - Error Corrections and Prior Period Adjustments (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 10, 2022
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Prepaid and other current assets   $ 151.5   $ 151.5   $ 81.6 [1]    
Deferred tax assets   342.3   342.3   290.5 [1] $ 307.7  
Long-term senior convertible notes   1,968.8   1,968.8   1,981.8 [1] 2,033.1  
Common stock   0.4   0.4   0.4 [1] 0.4  
Additional paid-in-capital   2,072.1   2,072.1   2,108.7 [1] 1,726.5  
Retained earnings (Accumulated deficit)   388.1   388.1   $ 138.7 [1] (78.2)  
Loss on extinguishment of debt       0.0        
Interest expense   (4.6) $ (4.6) [2] (13.9) $ (14.1) [2]      
Income before income taxes   146.2 112.0 [2] 257.6 250.4 [2]      
Income tax expense   45.0 24.7 [2] 8.2 28.2 [2]      
Net income   $ 101.2 $ 87.3 [2],[3] $ 249.4 $ 222.2 [2],[4]      
Basic net income per share (USD per share) | $ / shares   $ 0.26 $ 0.23 [2] $ 0.64 $ 0.57 [2]      
Diluted net income per share (USD per share) | $ / shares   $ 0.24 $ 0.21 [2] $ 0.60 $ 0.54 [2]      
Shares used to compute basic net income per share (shares) | shares   389.8 387.4 [2] 390.4 386.5 [2]      
Shares used to compute diluted net income per share (shares) | shares   425.8 430.3 [2] 428.0 427.9 [2]      
Add back interest expense, net of tax attributable to assumed conversion of senior convertible notes   $ 2.8 $ 2.8 $ 8.3 $ 8.6      
Stock split ratio 4   4   4 4    
As Previously Reported                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Prepaid and other current assets   168.6   168.6        
Deferred tax assets   271.3   271.3   $ 220.8 216.4  
Long-term senior convertible notes   1,753.1   1,753.1   1,702.7 1,667.2  
Common stock           0.1 0.1  
Additional paid-in-capital   2,466.5   2,466.5   2,504.5 2,125.3  
Retained earnings (Accumulated deficit)   155.5   155.5   (47.4) (202.1)  
Loss on extinguishment of debt       (0.4)        
Interest expense   (25.5) $ (25.1) (76.0) $ (75.1)      
Income before income taxes   125.3 90.7 195.1 188.6      
Income tax expense   40.8 19.8 (7.8) 14.5      
Net income   $ 84.5 $ 70.9 $ 202.9 $ 174.1      
Basic net income per share (USD per share) | $ / shares   $ 0.22 $ 0.18 $ 0.52 $ 0.45      
Diluted net income per share (USD per share) | $ / shares   $ 0.21 $ 0.18 $ 0.51 $ 0.44      
Shares used to compute diluted net income per share (shares) | shares   398.9 402.0 401.1 399.3      
ASU 2020-06 Adjustment                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Prepaid and other current assets   $ (17.1)   $ (17.1)        
Deferred tax assets   71.0   71.0   69.7 91.3  
Long-term senior convertible notes   215.7   215.7   279.1 365.9  
Common stock           0.0 0.0  
Additional paid-in-capital   (394.4)   (394.4)   (395.5) (398.5) $ 242.3
Retained earnings (Accumulated deficit)   232.6   232.6   186.1 123.9 $ 67.8
Loss on extinguishment of debt       0.4        
Interest expense   20.9 $ 20.5 62.1 $ 61.0      
Income before income taxes   20.9 21.3 62.5 61.8      
Income tax expense   4.2 4.9 16.0 13.7      
Net income   $ 16.7 $ 16.4 $ 46.5 $ 48.1      
Basic net income per share (USD per share) | $ / shares   $ 0.04 $ 0.05 $ 0.12 $ 0.12      
Diluted net income per share (USD per share) | $ / shares   $ 0.03 $ 0.03 $ 0.09 $ 0.10      
Shares used to compute diluted net income per share (shares) | shares   26.9 28.3 26.9 28.6      
Stock Split Adjustment                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Deferred tax assets           0.0 0.0  
Long-term senior convertible notes           0.0 0.0  
Common stock           0.3 0.3  
Additional paid-in-capital           (0.3) (0.3)  
Retained earnings (Accumulated deficit)           $ 0.0 $ 0.0  
[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 also 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.