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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2018 | Mar. 26, 2017 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accumulated deficit | $ 723.2 |  |  | $ 720.8
Revenue | 143.0 | $ 132.0 |  |
Cost of revenue | 102.2 | $ 95.9 |  |
Remaining performance obligation | 551.8 |  |  |
ASC 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accumulated deficit |  |  | $ 721.0 |
ASC 606 Adjustment | ASC 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accumulated deficit |  |  | $ 0.2 |
Effect of Change Higher/(Lower) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenue | 7.7 |  |  |
Cost of revenue | 4.2 |  |  |
Effect of Change Higher/(Lower) | ASC 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accumulated deficit | $ (3.5) |  |  |

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