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v3.10.0.1

Subsequent Event (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 16, 2018 | Oct. 05, 2018 | Dec. 31, 2018 | Sep. 30, 2018
Subsequent events |  |  |  |
Subsequent events |  |  |  |
Dividend declared date |  | Oct. 05, 2018 |  |
Cash dividend declared (in dollars per share) |  | $ 0.25 |  |
Dividends payable date |  | Nov. 30, 2018 |  |
Dividends payable date of record |  | Nov. 15, 2018 |  |
Dividend payable |  | $ 16.1 |  |
General Dynamics Information Technology's Citizen Engagement Centers |  |  |  |
Subsequent events |  |  |  |
Acquisition-related expenses |  |  |  | $ 0.5
General Dynamics Information Technology's Citizen Engagement Centers | Subsequent events |  |  |  |
Subsequent events |  |  |  |
Share capital acquired (as a percent) | 100.00% |  |  |
Cash consideration | $ 400.0 |  |  |
Acquisition-related expenses |  |  | $ 3.0 |
Line of Credit | General Dynamics Information Technology's Citizen Engagement Centers | Subsequent events |  |  |  |
Subsequent events |  |  |  |
Proceeds from long-term lines of credit | $ 150.0 |  |  |

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