Income Taxes - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 30, 2018	Dec. 31, 2017	Dec. 25, 2016
Income Tax Disclosure [Abstract]
Income tax (benefit) at federal statutory rate									$ 1.8	$ (20.0)	$ (18.1)
State taxes, net of federal tax benefit and valuation allowance									0.9	0.5	0.1
Difference in tax rates between U.S. and foreign									0.7	0.0	0.1
Increase (decrease) in valuation allowance									4.7	(45.6)	18.9
Nondeductible expense									0.6	1.1	0.7
Increase in reserve for uncertain tax positions									4.0	1.3	0.1
Changes to indefinite life items and separate state deferred taxes									(0.7)	(1.8)	4.0
One-time transition tax on previously undistributed foreign earnings									2.2	6.2	0.0
Goodwill impairment									0.0	8.1	0.0
Decrease in deferred taxes related to disposition									(9.6)	0.0	0.0
Impact related to the 2017 Tax Act									0.0	40.0	0.0
Total	$ 0.2	$ 3.4	$ 0.1	$ 0.9	$ (11.8)	$ (1.1)	$ 1.3	$ 1.4	$ 4.6	$ (10.2)	$ 5.8