Income Taxes (Schedule of Reconciliation of Income Taxes at Statutory Rate and Tax Provision) (Details) - USD ($) $ in Millions	6 Months Ended			12 Months Ended
	Dec. 30, 2022		Jun. 16, 2022	Dec. 30, 2022	Dec. 31, 2021		Dec. 25, 2020
Income Taxes [Line Items]
Income tax expense (benefit), intercompany financing and legal entity reorganization	$ (24.9)		$ (473.4)		$ (59.9)		$ 384.2
Benefit for income taxes at domestic statutory income tax rate (1)	(81.3)	[1]	(101.4)		(103.7)	[1]	(120.1)	[1]
Adjustments to reconcile to income tax provision:
Rate difference between non-U.S. and U.S. jurisdictions	4.7		(226.5)		224.9		315.3
Valuation allowances (6)	25.9		(600.8)		189.7		618.2
Adjustments to accrued income tax liabilities and uncertain tax positions	0.0	[2]	0.0		(9.7)	[2]	16.7	[2]
Credits, principally research	0.0		(0.9)		(4.7)		(11.2)
Permanently nondeductible and nontaxable items	3.1		(1.7)		9.8		2.8
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount	4.7		0.0		0.0		0.0
Income tax benefit, tax cut and jobs act	0.0		0.0		0.0		(281.5)
Other	(1.4)		(3.1)		0.3		0.1
Income tax benefit, Legal Reorganization	0.0		0.0		0.0		82.0
Effective Income Tax Rate Reconciliation, Separation Costs	0.0		0.0		0.0		8.4
Effective Income Tax Rate Reconciliation, Reorganization Items, net	1.7		15.7		36.9		8.8
Provision for (benefit from) income taxes	(52.0)		(497.3)		(106.3)		8.9
Increase (Decrease) Tax Benefit, Jurisdiction Rate Difference				$ 90.4
Increase (Decrease) Tax Expense (Benefit) due to opioid-related settlement charge				10.6
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount							204.9
Increase (Decrease) Tax Benefit, Medicaid Lawsuit				48.9
Increase (Decrease) Tax Expense (Benefit), Change in Operating Income	(30.2)		(12.8)	92.9
Increase (Decrease) Tax Expense (Benefit) due to reorganization items, net				27.6
Increase (Decrease) Tax Expense (Benefit), Non-restructuring Impairment Charges				$ 13.2
Effective income tax rate reconciliation, pension plan settlement	$ 0.0		$ (31.6)		$ 0.0		$ 0.0
IRELAND
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	12.50%		12.50%		12.50%		12.50%

[1] The statutory tax rate reflects the Irish statutory tax rate of 12.5%.

[2] Includes interest and penalties on accrued income tax liabilities and uncertain tax positions.