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Accounts Payable and Other Current Liabilities - Schedule of Other Payables and Current Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Other Liabilities Disclosure [Abstract]    
Accrued expenses and other $ 120.6 $ 125.8
Accrued interest 31.5 56.1
Income taxes payable 104.5 78.0
Accounts Payable and Accrued Liabilities, Current $ 321.3 $ 373.1