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Revenue recognition (Tables) | 6 Months Ended
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Jun. 30, 2019
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, 2019 |  | Three Months Ended June 30, 2018
|  | U.S. Government |  | Non-U.S. Government |  | Total |  | U.S. Government |  | Non-U.S. Government |  | Total
Product sales |  | $ | 94.6 |  |  | $ | 88.9 |  |  | $ | 183.5 |  |  | $ | 169.9 |  |  | $ | 10.2 |  |  | $ | 180.1 |
Contract manufacturing |  | — |  |  | 18.7 |  |  | 18.7 |  |  | — |  |  | 23.6 |  |  | 23.6 |
Contracts and grants |  | 38.3 |  |  | 2.7 |  |  | 41.0 |  |  | 15.3 |  |  | 1.2 |  |  | 16.5 |
Total revenues |  | $ | 132.9 |  |  | $ | 110.3 |  |  | $ | 243.2 |  |  | $ | 185.2 |  |  | $ | 35.0 |  |  | $ | 220.2 |
|  | Six months ended June 30, 2019 |  | Six Months Ended June 30, 2018
|  | U.S. Government |  | Non-U.S. Government |  | Total |  | U.S. Government |  | Non-U.S. Government |  | Total
Product sales |  | $ | 167.9 |  |  | $ | 168.6 |  |  | $ | 336.5 |  |  | $ | 235.9 |  |  | $ | 19.9 |  |  | $ | 255.8 |
Contract manufacturing |  | — |  |  | 34.6 |  |  | 34.6 |  |  | — |  |  | 49.8 |  |  | 49.8 |
Contracts and grants |  | 58.7 |  |  | 4.1 |  |  | 62.8 |  |  | 30.1 |  |  | 2.3 |  |  | 32.4 |
Total revenues |  | $ | 226.6 |  |  | $ | 207.3 |  |  | $ | 433.9 |  |  | $ | 266.0 |  |  | $ | 72.0 |  |  | $ | 338.0 |
Rollforward of Contract Liabilities | The following table presents the rollforward of deferred revenue contract liability balances:
December 31, 2018 |  | $ | 73.1 |
Deferral of revenue |  | 23.8 |
Revenue recognized |  | (7.4 | )
June 30, 2019 |  | $ | 89.5 |
Schedule of Accounts Receivable, Net | Accounts receivable including unbilled accounts receivable contract assets consist of the following:
|  | June 30, 2019 |  | December 31, 2018
Billed, net |  | $ | 179.5 |  |  | $ | 234.0 |
Unbilled |  | 38.6 |  |  | 28.5 |
Total, net |  | $ | 218.1 |  |  | $ | 262.5 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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