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Other Intangible Assets and Goodwill (Estimated Future Amortization Expense) (Details) - USD ($)
$ in Millions
Jun. 27, 2021
Sep. 27, 2020
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021 (excluding the three quarters ended June 27, 2021) $ 49.7  
2022 193.5  
2023 20.9  
2024 20.3  
2025 14.5  
Thereafter 3.1  
Total estimated future amortization expense $ 302.0 $ 457.1