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Other Intangible Assets and Goodwill Other Intangible Assets and Goodwill (Estimated Future Amortization Expense) (Details) - USD ($)
$ in Millions
Jul. 01, 2018
Oct. 01, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 56.7  
2019 224.8  
2020 225.7  
2021 202.3  
2022 169.2  
Thereafter 15.4  
Net carrying amount $ 894.1 $ 214.2