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Other Intangible Assets and Goodwill Other Intangible Assets and Goodwill (Estimated Future Amortization Expense) (Details) - USD ($)
$ in Millions
Dec. 30, 2018
Sep. 30, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 164.4  
2019 219.1  
2020 195.8  
2021 168.4  
2022 5.2  
Thereafter 6.3  
Net carrying amount $ 759.2 $ 811.2