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Other Intangible Assets and Goodwill (Estimated Future Amortization Expense) (Details) - USD ($)
$ in Millions
Dec. 27, 2020
Sep. 27, 2020
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021 $ 165.4  
2022 190.8  
2023 19.7  
2024 19.1  
2025 13.2  
Thereafter 2.8  
Net Carrying Amount $ 411.0 $ 457.1