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Intangible assets and goodwill (Tables)
 6 Months Ended
Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets The following table summarizes the Company's Intangible assets, net:
Weighted Average Useful Life in YearsJune 30, 2023December 31, 2022
Gross Carrying AmountAccumulated Amortization
Net Carrying Amount (1)
Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Products13.6$849.1 $256.3 $592.8 $982.1 $253.3 $728.8 
Customer relationships0.028.6 28.6 — 28.6 28.6 — 
CDMO0.05.5 5.5 — 5.5 5.5 — 
Total intangible assets$883.2 $290.4 $592.8 $1,016.2 $287.4 $728.8 
(1) During the six months ended June 30, 2023, the Company sold $102.9 million of intangible assets, net as part of the sale of its travel health business to Bavarian Nordic. See Note 3, "Divestiture" for more information on the sale of the business.
Finite-lived Intangible Assets Amortization Expense
Amortization expense associated with the Company's intangible assets was recorded as follows:
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Amortization expense$16.1 $14.0 $33.1 $28.0 
Schedule of Goodwill
The table below summarizes the changes in the carrying amount of goodwill by reportable segment:
Products (1)
Services (2)
Total
Balance at December 31, 2022$218.2 $— $218.2 
Balance at June 30, 2023$218.2 $— $218.2 
(1) Amounts for the Company's Products segment include gross carrying values of $259.9 million as of June 30, 2023 and December 31, 2022 and accumulated impairment losses of $41.7 million.
(2) Amounts for the Company's Services segment include gross carrying values of $6.7 million as of June 30, 2023 and December 31, 2022, and accumulated impairment losses of $6.7 million.