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Financial Instruments (Carrying Amount and Cumulative Hedging Adjustment) (Details) - Long-term debt - USD ($)
$ in Millions
Jun. 30, 2020
Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying amounts of hedged item $ 406.7 $ 404.7
Cumulative hedging adjustment, included in carrying amount $ 7.0 $ 5.2