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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2018 | Apr. 01, 2018 | Jun. 25, 2017 | Jul. 01, 2018 | Jun. 25, 2017 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accumulated deficit | $ 730.9 |  |  | $ 730.9 |  |  | $ 720.8
Revenue | 151.2 |  | $ 147.9 | 294.2 | $ 279.9 |  |
Remaining performance obligation | 501.9 |  |  | 501.9 |  |  |
Contract assets, Net change |  | $ 21.2 |  |  |  |  |
Contract liabilities, Net change |  | $ (11.5) |  |  |  |  |
Revenue recognized | 18.5 |  |  | 29.5 |  |  |
Effect of Change Higher/(Lower) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Revenue | 3.6 |  |  | 11.2 |  |  |
Cost of revenue | 4.0 |  |  | 8.3 |  |  |
ASC 606 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  | $ 721.0 |
ASC 606 | Effect of Change Higher/(Lower) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accumulated deficit | (2.9) |  |  | (2.9) |  |  |
Revenue | $ 3.6 |  |  | $ 11.2 |  |  |
ASC 606 Adjustment | ASC 606 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  | $ 0.2 |

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