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Intangible assets and goodwill
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets and goodwill Intangible assets and goodwill
The Company's finite-lived intangible assets consist of products acquired via business combinations or asset acquisitions. The following table summarizes the Company's finite-lived intangible assets:
Weighted Average Useful Life in YearsMarch 31, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Products13.5$855.4 $305.0 $550.4 $855.4 $288.8 $566.6 
Customer relationships0.028.6 28.6 — 28.6 28.6 — 
CDMO0.05.5 5.5 — 5.5 5.5 — 
Total intangible assets$889.5 $339.1 $550.4 $889.5 $322.9 $566.6 
Amortization expense associated with the Company's finite-lived intangible assets was recorded as follows:
Three Months Ended March 31,
20242023
Amortization expense$16.2 $17.0 
As of March 31, 2024 and December 31, 2023, the Company had no remaining goodwill balance on the Condensed Consolidated Balance Sheets due to impairment charges recorded during the third quarter of 2023.