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Accounts Payable and Other Current Liabilities - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Accounts Payable and Other Current Liabilities [Abstract]    
Accrued interest $ 31.5 $ 56.1
Income taxes payable 104.5 78.0
Accrued expenses and other 120.6 125.8
Total accounts payable and other current liabilities $ 321.3 $ 373.1