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Intangible assets and goodwill - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 889.5 | $ 1,016.2
Accumulated Amortization | 306.7 | 287.4
Net Carrying Amount | 582.8 | 728.8
Chimerix |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired | $ 6.3 |
BARDA | Ebanga |  |
Finite-Lived Intangible Assets [Line Items] |  |
Term of contract | 10 years |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Travel Health Business |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets disposed of in sale | $ 102.9 |
Products |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life in Years | 13 years 6 months |
Gross Carrying Amount | $ 855.4 | 982.1
Accumulated Amortization | 272.6 | 253.3
Net Carrying Amount | $ 582.8 | 728.8
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life in Years | 0 years |
Gross Carrying Amount | $ 28.6 | 28.6
Accumulated Amortization | 28.6 | 28.6
Net Carrying Amount | $ 0.0 | 0.0
CDMO |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life in Years | 0 years |
Gross Carrying Amount | $ 5.5 | 5.5
Accumulated Amortization | 5.5 | 5.5
Net Carrying Amount | $ 0.0 | $ 0.0

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