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Revenue recognition (Tables)
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue The Company's revenues disaggregated by the major sources were as follows:
Three Months Ended June 30, 2021Three Months Ended June 30, 2020
 
U.S.
Government
Non-U.S.
Government
 Total
U.S.
Government
Non-U.S.
Government
 Total
Product sales, net$66.3 $114.9 $181.2 $224.2 $74.3 $298.5 
CDMO services70.4 120.5 190.9 44.6 28.0 72.6 
Contracts and grants24.4 1.0 25.4 20.7 2.9 23.6 
Total revenues$161.1 $236.4 $397.5 $289.5 $105.2 $394.7 
Six Months Ended June 30, 2021Six Months Ended June 30, 2020
U.S.
Government
Non-U.S.
Government
 Total
U.S.
Government
Non-U.S.
Government
 Total
Product sales, net$122.7 $196.4 $319.1 $288.1 $158.6 $446.7 
CDMO services167.9 206.8 374.7 44.6 49.7 94.3 
Contracts and grants44.4 2.3 46.7 42.7 3.5 46.2 
Total revenues$335.0 $405.5 $740.5 $375.4 $211.8 $587.2 
Rollforward of Contract Liabilities The following table presents the roll forward of the contract liability balances:
December 31, 2020$100.1 
Deferral of revenue194.7 
Revenue recognized(191.4)
June 30, 2021$103.4 
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction The Company has allocated contracted operating lease revenues due under our long-term CDMO service arrangements as follows:
Year ended December 31,
2021 (1)
$33.8 
202267.7 
202328.2 
$129.7 
(1) As of June 30, 2021, amount represents the six months ending December 31, 2021.
Schedule of Accounts Receivable, Net
Accounts receivable, including unbilled accounts receivable contract assets, consist of the following:
June 30, 2021December 31, 2020
Billed, net$210.3 $172.7 
Unbilled51.6 58.2 
Total, net$261.9 $230.9