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Basis of Presentation - Financial Statement Impact (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Prior period reclassification adjustment |  |  | $ 0.3 |  |  |
Adoption of ASC 606 as of January 1, 2018 |  |  | 0.1 |  |  |
Unbilled contract revenue | $ 0.0 |  | 0.0 |  | $ 0.1 |
Accumulated deficit | (343.3) |  | (343.3) |  | (284.4) | $ (284.5)
Revenue | 34.1 | $ 50.3 | 109.2 | $ 101.5 |  |
Net income (loss) | (7.8) | (8.5) | (58.9) | (23.3) |  |
Cost of sales - separative work units and uranium | 20.9 | 32.7 | 98.6 | 77.9 |  |
Nonoperating components of periodic benefit expense (income), net | (1.6) | (0.3) | (4.9) | (1.1) |  |
Net cash used in operating activities |  |  | (77.7) | (86.6) |  |
Net cash used in financing activities |  |  | (6.1) | (40.0) |  |
Operating leases, future minimum payments due |  |  |  |  |  | $ 13.0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
Unbilled contract revenue |  |  |  |  | 0.1 |
Accumulated deficit |  |  |  |  | $ 0.1 |
Revenue | 1.9 |  | (0.1) |  |  |
Net income (loss) | 1.9 |  | (0.1) |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
Revenue | 32.2 |  | 109.3 |  |  |
Net income (loss) | $ (9.7) |  | $ (58.8) |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |  |
Cost of sales - separative work units and uranium |  | 32.4 |  | 76.8 |  |
Net cash used in operating activities |  |  |  | (95.6) |  |
Net cash used in financing activities |  |  |  | (31.0) |  |
Restatement Adjustment [Member] |  |  |  |  |  |
Cost of sales - separative work units and uranium |  | 0.3 |  | 1.1 |  |
Nonoperating components of periodic benefit expense (income), net |  | $ 0.3 |  | 1.1 |  |
Net cash used in operating activities |  |  |  | 9.0 |  |
Net cash used in financing activities |  |  |  | $ (9.0) |  |

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