Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	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