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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Income Tax Disclosure [Abstract] |  |  |
Decrease in net deferred tax liabilities | $ 6.9 |  |
Operating loss carryforwards with indefinite-lived carryforward | 6.3 |  |
Decrease to deferred tax assets | 6.2 |  |
Decrease in valuation allowance | 47.8 |  |
Operating Loss Carryforwards [Line Items] |  |  |
Federal annual utilization of NOL carryforwards limit, next five years | $ 27.0 |  |
Threshold period for change in allowed annual amount of NOL to be recognized | 5 years |  |
Federal annual utilization of NOL carryforwards limit, after year five | $ 11.6 |  |
Unrecognized deferred income taxes or foreign withholding taxes | 7.7 |  |
Unrecognized deferred income taxes or foreign withholding taxes, cash and cash equivalents available for distribution | 10.7 |  |
Unrecognized tax benefits that if recognized would affect effective tax rate | 15.6 |  |
Amount that would become a deferred tax asset included in unrecognized tax benefits that would impact the effective tax rate | 11.0 |  |
Income tax penalties and interest expense | 0.5 | $ 0.9 | $ 0.2
Benefit for income tax penalties and interest related to reversal of prior positions | 0.2 | 0.0 | 0.1
Total interest and penalties accrued | 2.2 | $ 1.9 | $ 1.0
Unrecognized tax benefits that will expire within the next 12 months | 0.4 |  |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 390.7 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 348.7 |  |

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