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Fair Value of Financial Assets and Financial Liabilities (Details) - USD ($)
$ in Millions
Mar. 27, 2020
Sep. 27, 2019
Fair Value Disclosure | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debt $ 7,438.6 $ 6,851.2
Carrying Value Disclosure    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying value of debt $ 7,966.0 $ 6,682.2