Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jun. 16, 2022	Jun. 25, 2021	Jul. 01, 2022	Jun. 16, 2022	Jun. 25, 2021	Dec. 31, 2021
Income Taxes [Line Items]
Income tax benefit	$ 9.7	$ 491.4	$ 33.5		$ 497.3	$ 49.9
Effective tax rate	13.20%	71.70%	24.00%		6130.00%	16.60%
Current Income Tax Expense (Benefit)	$ 3.3	$ 18.9	$ 23.6		$ 23.9	$ 36.6
Deferred Income Tax Expense (Benefit)	6.4	472.5	9.9		473.4	13.3
Income Taxes Paid, Net	(0.7)				(3.0)	59.6
Unrecognized tax benefits	24.8			$ 24.8			$ 333.5
Unrecognized tax benefits, which if favorably settled would benefit the effective tax rate	24.8			24.8
Increase (Decrease) Tax Expense (Benefit), Change in Operating Income	8.0		26.0			39.0
Increase (Decrease), Tax Expense (Benefit), CARES Act			(0.4)			(0.9)
Increase (Decrease), Tax Expense (Benefit), Uncertain Tax Positions			3.3		285.3	3.3
Increase (Decrease), Income Tax Expense (Benefit), Separation Costs, Reorganization Items, and Restructuring Charges	1.7		3.8			6.7
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	0.3	0.4		0.9	0.7
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(73.4)	$ (685.2)	$ (139.7)		(811.3)	(300.3)
Increase (Decrease) Tax Expense (Benefit), Cancellation of Debt Income					1,231.5
Increase (Decrease) Income Tax Expense (Benefit), Deferred Tax Liabilities Fresh Start Adjustments					297.1
Unrecognized tax benefits, net increase				308.7
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities				2.6
Interest accrued on unrecognized tax benefits	$ 2.2			2.2			$ 18.9
Increase (Decrease) Income Tax Expense (Benefit), Valuation Allowance Reduction on Deferred Tax Assets					1,270.1
Increase (Decrease) Income Tax Expense (Benefit), Deferred Tax Assets, Reorganization Adjustments					$ 141.3
CARES Act [Member]
Income Taxes [Line Items]
Proceeds from Income Tax Refunds						$ 77.6
Fresh-Start Adjustments
Income Taxes [Line Items]
Unrecognized tax benefits, net increase				$ 306.1