Accounts Payable and Other Current Liabilities - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Accounts Payable and Other Current Liabilities [Abstract]
Accounts Payable	$ 583.5	$ 623.9
Accrued interest	146.5	123.9
Income taxes payable	68.3	93.4
Accrued expenses and other	172.9	196.7
Restructuring and related charges	2.6	8.1
Total accounts payable and other current liabilities	$ 989.8	$ 1,062.0