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Divestiture (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
May 15, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on sale of business $ 74.2 $ 0.0 $ 0.0  
Transaction costs 4.0      
Other income (expense), net (4.8) $ (49.0) $ (38.2)  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Travel Health Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal group, total consideration       $ 270.2
Other income (expense), net $ 3.2      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Travel Health Business | Development-Based Milestones        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Milestone payments receivable       80.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Travel Health Business | Sales-Based Milestones        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Milestone payments receivable       $ 30.0