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Summary of Significant Accounting Policies - Balance Sheet (Details) - USD ($) $ in Millions | Jul. 01, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Accounts receivable, net | $ 66.2 |  | $ 74.2
Unbilled receivables, net | 160.6 |  |
Inventoried costs | 49.0 |  | 49.0
Liabilities |  |  |
Accrued expenses | 38.4 |  | 40.9
Billings in excess of costs and earnings on uncompleted contracts | 32.9 |  |
Stockholders’ equity: |  |  |
Accumulated deficit | 730.9 |  | $ 720.8
ASC 606 |  |  |
Assets |  |  |
Unbilled receivables, net |  | $ 139.4 |
Inventoried costs |  | 48.7 |
Liabilities |  |  |
Accrued expenses |  | 40.3 |
Billings in excess of costs and earnings on uncompleted contracts |  | 44.6 |
Stockholders’ equity: |  |  |
Accumulated deficit |  | 721.0 |
ASC 606 | Balances Without Adoption of ASC 606 |  |  |
Assets |  |  |
Accounts receivable, net | 65.4 |  |
Unbilled receivables, net | 151.9 |  |
Inventoried costs | 57.3 |  |
Liabilities |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 34.6 |  |
Stockholders’ equity: |  |  |
Accumulated deficit | 733.8 |  |
ASC 606 | Effect of Change Higher/(Lower) |  |  |
Assets |  |  |
Accounts receivable, net | 0.8 |  |
Unbilled receivables, net | 8.7 |  |
Inventoried costs | (8.3) |  |
Liabilities |  |  |
Billings in excess of costs and earnings on uncompleted contracts | (1.7) |  |
Stockholders’ equity: |  |  |
Accumulated deficit | $ (2.9) |  |
Balance at January 1, 2018 | ASC 606 |  |  |
Assets |  |  |
Unbilled receivables, net |  | 138.1 |
Inventoried costs |  | 49.0 |
Liabilities |  |  |
Accrued expenses |  | 40.9 |
Billings in excess of costs and earnings on uncompleted contracts |  | 42.8 |
Stockholders’ equity: |  |  |
Accumulated deficit |  | 720.8 |
ASC 606 Adjustment | ASC 606 |  |  |
Assets |  |  |
Unbilled receivables, net |  | 1.3 |
Inventoried costs |  | (0.3) |
Liabilities |  |  |
Accrued expenses |  | (0.6) |
Billings in excess of costs and earnings on uncompleted contracts |  | 1.8 |
Stockholders’ equity: |  |  |
Accumulated deficit |  | $ 0.2 |

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