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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2023
Related Party Transactions [Abstract]  
Expenses related to Related Party which were Settled in Cash
The following is the summary of expenses related to the Paragon Agreement, which were ultimately settled in cash (in millions):
 
     Three Months
Ended
September 30,		      Nine Months
Ended
September 30,		       
     2023      2022      2023      2022      Financial Statement Line Item
Reimbursable costs under the Paragon Agreement
    $ 16.7      $ —      $ 17.9      $ —      Research and development
Related Party Accounts Payable
The following is the summary of Related party accounts payable (in millions):
 
     September 30,
2023		      December 31,
2022		  
Reimbursable costs under the Paragon Agreement
    $ 16.8      $ —  
Parapyre Option Obligation liability
      3.0        —  
    
 
 
     
 
 
  
Total related party accounts payable
    $ 19.8      $ —