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Supplemental (Summary of Liabilities Resulting from Related Party Transactions) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Sep. 30, 2019
Related Party Transactions [Abstract]    
Payables and accrued liabilities $ 8.9 $ 8.9
Current portion of long-term debt 76.4 37.8
Long-term debt – related party $ 285.6 $ 320.1