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Receivables, net - Summary of Analysis of Allowance for Doubtful Trade Accounts Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at Beginning of Period $ 48.6 $ 37.4 $ 21.9
Charged to Costs and Expenses 6.0 7.4 15.5
Deductions (6.3) (2.4) 0.0
Other Adjustments (4.3) 6.2 0.0
Balance at End of Period $ 44.0 $ 48.6 $ 37.4