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Fair Value of Financial Assets and Financial Liabilities (Details) - USD ($)
$ in Millions
Mar. 29, 2019
Sep. 28, 2018
Fair Value Disclosure | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debt $ 7,271.6 $ 7,303.1
Carrying Value Disclosure    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying value of debt $ 7,190.6 $ 7,244.0