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Fair Value - Narrative (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Convertible debt, fair value $ 367.1 $ 405.6
Level 3 | Recurring | Valuation, Market Approach | Discount Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration, liability, measurement input 0.0132