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Acquisitions (Summary of Liabilities Resulting from Related Party Transaction) (Details)
$ in Millions, ¥ in Billions
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Apr. 26, 2018
CNY (¥)
Acquisitions [Abstract]      
Payables and accrued liabilities $ 8.9 $ 330.0  
Current portion of long-term debt 37.8 0.0  
Long-term debt – related party $ 320.1 [1] $ 384.3 [1] ¥ 2.3
[1]
Refer to Note 7, Acquisitions, for additional information regarding related party debt.