Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory income tax rate (percent)	35.00%	35.00%	35.00%	35.00%
Income tax benefit at federal statutory rate	$ (1.4)	$ (7.5)	$ (5.9)	$ (17.0)
State and foreign taxes, net of federal tax benefit and valuation allowance	0.2	0.5	0.6	1.9
Nondeductible expenses and other	(0.5)	0.1	0.5	0.8
Impact of deferred tax liabilities for indefinite-lived assets	(0.6)	1.2	2.2	3.5
Increase in reserves for uncertain tax positions	0.6	0.2	0.7	1.9
Increase in federal valuation allowance	1.9	7.4	5.4	16.2
Total income tax provision	$ 0.2	$ 1.9	$ 3.5	$ 7.3