Derivative Financial Instruments Interest Rate Swaps (Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position) (Details) - Interest Rate Swap [Member] - Designated as Hedging Instrument [Member] - Long-term Debt [Member] - USD ($) $ in Millions	Dec. 27, 2020	Sep. 27, 2020
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 782.7	$ 785.6
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 32.7	$ 35.6