Reorganization Items, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 26, 2021	Mar. 27, 2020
Schedule of Reorganization Items, net [Line Items]
Debtor Reorganization Items, Legal and Advisory Professional Fees	$ 77.7
Debtor Reorganization Items, Write-off of Debt Issuance Costs and Debt Discounts	16.3
Debtor Reorganization Items, Provision for Expected Allowed Claims	(0.5)
Reorganization Items	93.5	$ 0.0
Cash Paid, Reorganization items	33.7
Lease rejection
Schedule of Reorganization Items, net [Line Items]
Increase (Decrease) Other current and non-current liabilities	34.8
Contingent Consideration
Schedule of Reorganization Items, net [Line Items]
Increase (Decrease) Other current and non-current liabilities	$ 15.6