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Other Intangible Assets and Goodwill (Estimated Future Amortization Expense) (Details) - USD ($)
$ in Millions
Mar. 28, 2021
Sep. 27, 2020
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021 (excluding the two quarters ended March 28, 2021) $ 103.6  
2022 190.3  
2023 19.6  
2024 19.0  
2025 13.1  
Thereafter 3.0  
Total estimated future amortization expense $ 348.6 $ 457.1