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Debt - Summary of Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Sep. 30, 2017
Debt Disclosure [Abstract]    
Short-term borrowings $ 37.7 $ 40.8
Current portion of long-term debt and capital lease obligations 9.8 10.3
Total short-term borrowings and current portion of long-term debt and capital lease obligations, net $ 47.5 $ 51.1