Income Taxes (Schedule of Unrecognized Tax Benefits Balance Sheet Location) (Details) - USD ($) $ in Millions	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 398.6	$ 287.7	$ 182.5	$ 118.7
Other Assets [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	204.7	0.0
Accrued and other current liabilities
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	0.0	1.0
Other Income Tax Liabilities
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	193.9	189.9
Deferred income tax liability (non-current)
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	0.0	96.8
Liabilities, Total [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 398.6	$ 287.7