Income Taxes (Schedule of Deferred Taxes Activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Income Tax Disclosure [Abstract]
Document Period End Date	Dec. 27, 2019
Deferred tax assets:
Tax loss and credit carryforwards	$ 2,263.4	$ 1,987.8
Deferred Tax Assets, Goodwill and Intangible Assets	981.2	757.7
Deferred Tax Assets, Opioid-related litigation settlement	273.7	0.0
Deferred Tax Asset, Interest Carryforward	81.5	71.4
Other	200.4	189.5
Total deferred tax assets, gross	3,800.2	3,006.4
Deferred tax liabilities:
Intangible assets	(139.4)	(264.7)
Interest-bearing deferred tax obligations	0.0	(227.5)
Investment in partnership	(178.9)	(170.2)
Deferred Tax Liabilities, Other	(46.3)	(42.9)
Total deferred tax liabilities, gross	(364.6)	(705.3)
Net deferred tax asset before valuation allowances	3,435.6	2,301.1
Valuation allowances	(3,131.5)	(2,604.9)
Deferred Tax Assets, Net, Noncurrent	$ 304.1
Deferred Tax Liabilities, Net		$ 303.8