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Intangible assets
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible assets
The Company's intangible assets consist of products acquired via business combinations or asset acquisitions. The following tables summarize the Company's intangible assets for the periods ended June 30, 2021 and December 31, 2020:
June 30, 2021
December 31, 2020
Asset Type
Estimated Life
CostAccumulated AmortizationNetCostAccumulated AmortizationNet
Products
9-22 years
$798.0 $165.6 $632.4 $798.0 $137.8 $660.2 
Customer relationships8 years28.6 28.3 0.3 28.6 26.5 2.1 
CDMO8 years5.5 5.1 0.4 5.5 4.7 0.8 
   Total intangible assets$832.1 $199.0 $633.1 $832.1 $169.0 $663.1 

During the six months ended June 30, 2021 and 2020, the Company recorded amortization expense for intangible assets of $30.0 million and $29.8 million, respectively. During the three months ended June 30, 2021 and 2020, the Company recorded amortization expense for intangible assets of $15.1 million and $15.0 million, respectively. As of June 30, 2021, the weighted average amortization period remaining for intangible assets was 12.3 years.

The following table provides a roll forward of changes in our goodwill balance:
Goodwill, December 31, 2020
$266.7 
Foreign currency translation(0.1)
Goodwill, June 30, 2021
$266.6