Income Taxes (Schedule of Deferred Taxes Activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 25, 2020
Deferred tax assets:
Tax loss and credit carryforward	$ 4,147.5	$ 4,026.0
Deferred Tax Assets, Capital Loss Carryforwards	1,605.0	1,600.1
Deferred Tax Assets, Opioid-related litigation settlement	294.7	269.3
Deferred Tax Asset, Interest Carryforward	159.5	150.7
Other	292.2	294.9
Total deferred tax assets, gross	6,498.9	6,341.0
Deferred tax liabilities:
Intangible assets	(108.5)	(191.2)
Investment in partnership	(67.1)	(74.8)
Deferred Tax Liabilities, Other	0.0	(44.8)
Total deferred tax liabilities, gross	(175.6)	(310.8)
Net deferred tax asset before valuation allowances	6,323.3	6,030.2
Valuation allowances	(6,344.2)	(6,110.8)
Deferred Tax Liabilities, Net	(20.9)	$ (80.6)
Increase (Decrease) Deferred Tax Assets, Legal Entity Reorganization	21.4
Increase (Decrease) Deferred Tax Assets, Intangible Asset Amortization	92.9
Increase (Decrease) Tax Loss Credit Carryforwards, Operational Activity	$ 178.8