Debt (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended	9 Months Ended
		Sep. 29, 2023	Sep. 30, 2022	Sep. 30, 2022	Jun. 16, 2022	Sep. 29, 2023	Sep. 08, 2023	Aug. 23, 2023	Dec. 30, 2022
Current maturities of long-term debt
Debt Issuance Costs, Current, Net		$ (2.6)				$ (2.6)			$ 0.0
Long-term debt
Total Debt Issuance Costs		2.6				2.6			20.8
Total Debt		3,892.0				3,892.0			3,092.6
Debt Instrument, Face Amount									3,534.1
Debt Issuance Costs		0.0				0.0			20.8
Debt Instrument, Face Amount, Current Maturity									(44.1)
Debt Instrument, Face Amount, Noncurrent Maturity									3,490.0
Secured Debt		3,892.0				3,892.0
Long-term Debt, Current Maturities		(380.0)				(380.0)			(44.1)
Debt Instrument, Face Amount, Liabilities Subject to Compromise									0.0
Liabilities subject to compromise		(4,932.1)				(4,932.1)			0.0
Long-term Debt		0.0				0.0			3,048.5
Debtor Reorganization Items, Debt Valuation Adjustments and Write-off of Debt Issuance Costs and Debt Discounts		426.9	$ 0.0	$ 0.0	$ 0.0	426.9
Debt Instrument, Unused Borrowing Capacity, Amount								$ 100.0
Debtor-in-Possession Financing, Initial Draw		150.0
Debtor-In-Possession Financing, Additional Draw		100.0
Debt Issuance Costs Write-Offs
Long-term debt
Debtor Reorganization Items, Debt Valuation Adjustments and Write-off of Debt Issuance Costs and Debt Discounts		18.5
2023 Restructuring Support Agreement
Long-term debt
Debtor-in-Possession Financing, Amount Arranged								$ 250.0
Long-term Debt
Long-term debt
Liabilities subject to compromise	[1]	(3,512.0)				(3,512.0)
Debtor Reorganization Items, Provision for Expected Allowed Claims		377.6
Debt Issuance Costs, Net
Long-term debt
Liabilities subject to compromise		0.0				0.0			0.0
10.00% Second Lien Senior Notes
Long-term debt
Total Debt Issuance Costs		0.0				0.0			0.0
Total Debt									242.2
Debt Instrument, Face Amount									321.9
Secured Debt		321.9				321.9
Long-term Debt									242.2
10.00% First Lien Senior Notes
Long-term debt
Total Debt Issuance Costs		0.0				0.0			0.0
Total Debt									475.9
Debt Instrument, Face Amount					$ 495.0				495.0
Secured Debt		495.0				495.0
Long-term Debt									475.9
2017 Replacement Term Loan
Long-term debt
Total Debt Issuance Costs		0.0				0.0			0.0
Total Debt									1,222.1
Debt Instrument, Face Amount		1,356.7				1,356.7			1,374.1
Secured Debt		1,356.7				1,356.7
2018 Replacement Term Loan
Long-term debt
Total Debt Issuance Costs		0.0				0.0			0.0
Total Debt									326.9
Debt Instrument, Face Amount		360.1				360.1			364.8
Secured Debt		360.1				360.1
Eleven Point Five Percent First Lien Senior Secured Notes
Long-term debt
Total Debt Issuance Costs		0.0				0.0			20.8
Total Debt									650.0
Debt Instrument, Face Amount									650.0
Secured Debt		650.0				650.0
Long-term Debt									650.0
Ten Point Zero Percent Second Lien Notes due 2029
Long-term debt
Total Debt Issuance Costs		0.0				0.0			0.0
Total Debt									175.5
Debt Instrument, Face Amount									328.3
Secured Debt		328.3				328.3
Long-term Debt									175.5
Receivables financing facility due June 2026
Long-term debt
Total Debt Issuance Costs		2.6				2.6			0.0
Total Debt									0.0
Debt Instrument, Face Amount									0.0
Secured Debt		100.0				100.0
Debtor-In-Possession Financing
Long-term debt
Total Debt Issuance Costs		0.0				0.0			0.0
Total Debt									0.0
Debt Instrument, Face Amount		280.0				280.0			0.0
Secured Debt		$ 280.0				$ 280.0			$ 0.0
Debt Instrument, Basis Spread on Variable Rate		8.00%
Backstop Commitments, Premium Percentage							12.00%
Debtor-In-Possession Financing | Minimum
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage							1.00%

[1] The Company expensed $377.6 million to adjust the carrying value up to the principal value or estimated allowed claim amount and recorded the expense within in reorganization items, net in the unaudited condensed consolidated statement of operations for the three months ended September 29, 2023 (Successor).