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Debt - Additional Information (Details) - Convertible Senior Notes Due 2027 - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2021
Debt        
Face amount $ 420.0      
Interest rate (as percent) 1.125%      
Net proceeds $ 408.6      
Interest expense   $ 1.2 $ 1.6  
Carrying amount of the liability component $ 294.6      
Discount rate (as percent) 6.50%      
Fair value of the liability component $ 125.4      
Debt issuance costs $ 11.4      
Accretion of debt discount   3.6 4.7  
Amortization of debt issuance costs   $ 0.2 $ 0.2  
Effective interest percentage (as percent)   6.40% 6.40%  
Period where noteholders may convert their notes at their election prior to the maturity date 2 days      
Conversion rate 18.9109      
Conversion price (in dollars per share) $ 52.88      
Upper strike price (in dollars per share) $ 86.174      
Capped call transaction $ 60.4      
Forecast        
Debt        
Accretion of debt discount       $ 15.0
Amortization of debt issuance costs       $ 0.8