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Revenue recognition (Tables) | 3 Months Ended
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Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The Company's revenues disaggregated by the major sources were as follows:
| Three Months Ended March 31, 2020 |  | Three Months Ended March 31, 2019
| U.S. Government |  | Non-U.S. Government |  | Total |  | U.S. Government |  | Non-U.S. Government |  | Total
Product sales, net | $ | 63.9 |  |  | $ | 84.3 |  |  | $ | 148.2 |  |  | $ | 73.3 |  |  | $ | 79.7 |  |  | $ | 153.0 |
Contract development and manufacturing services | — |  |  | 21.7 |  |  | 21.7 |  |  | — |  |  | 15.9 |  |  | 15.9 |
Contracts and grants | 22.0 |  |  | 0.6 |  |  | 22.6 |  |  | 20.4 |  |  | 1.3 |  |  | 21.7 |
Total revenues | $ | 85.9 |  |  | $ | 106.6 |  |  | $ | 192.5 |  |  | $ | 93.7 |  |  | $ | 96.9 |  |  | $ | 190.6 |
Rollforward of Contract Liabilities | The following table presents the rollforward of the contract liability balances:
December 31, 2019 | $ | 88.9 |
Deferral of revenue | 6.4 |
Revenue recognized | (5.9 | )
March 31, 2020 | $ | 89.4 |
Schedule of Accounts Receivable, Net | Accounts receivable, including unbilled accounts receivable contract assets, consist of the following:
|  | March 31, 2020 |  | December 31, 2019
Billed, net |  | $ | 119.4 |  |  | $ | 227.3 |
Unbilled |  | 43.1 |  |  | 43.4 |
Total, net |  | $ | 162.5 |  |  | $ | 270.7 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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