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Divestiture (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 18, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
May 15, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain (loss) on sale of business   $ (40.0) $ 74.9 $ (40.0) $ 74.9 $ 74.2  
Transaction costs           $ 4.0  
Other income (expense), net   (66.3) 42.7 (94.0) 29.7    
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]              
Cash purchase price for sale of business             $ 270.2
Other income (expense), net   $ 0.1 $ 1.0 $ 0.5 $ 1.0    
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 | Development-Based Milestones | Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Increase in contingent consideration, asset $ 10.0            
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