Fresh-Start Accounting - Reorganization Items (Details) - USD ($) $ in Millions		6 Months Ended		12 Months Ended
	Jun. 16, 2022	Dec. 30, 2022	Jun. 16, 2022	Dec. 31, 2021	Dec. 25, 2020
Reorganization, Chapter 11 [Line Items]
Cash Paid, Reorganization items		$ 18.4	$ 304.1	$ 333.1	$ 8.7
Debtor Reorganization Items, Legal and Advisory Professional Fees		23.2	161.1	405.6	51.1
Debtor Reorganization Items, Success Fees		0.0	44.3	0.0	0.0
Debtor Reorganization Items, Net, Prepaid Expense Write-Off		0.0	9.2	0.0	0.0
Debtor Reorganization Items, Write-off of Debt Issuance Costs and Debt Discounts		0.0	0.0	23.1	10.2
Debtor Reorganization Items, Gain (Loss) on Settlement of Other Claims, Net		0.0	5.4	(0.5)	0.1
Reorganization items, net		23.2	630.9	428.2	61.4
Reorganization, Chapter 11, Plan Effect Adjustment
Reorganization, Chapter 11 [Line Items]
Gain on settlement of liabilities subject to compromise	$ 943.7	0.0	(943.7)	0.0	0.0
Reorganization, Chapter 11, Fresh-Start Adjustment
Reorganization, Chapter 11 [Line Items]
Reorganization Items, net, Loss on Fresh-Start Adjustments	$ (1,354.6)	$ 0.0	$ 1,354.6	$ 0.0	$ 0.0