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Convertible Senior Notes - Interest Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Debt Disclosure [Abstract]    
Coupon interest $ 0.9 $ 2.2
Amortization of debt discount and issuance costs 0.2 0.4
Total interest expense $ 1.1 $ 2.6