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Receivables, net - Summary of Analysis of Allowance for Doubtful Trade Accounts Receivables (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at Beginning of Period $ 37.4 $ 21.9 $ 14.1
Charged to Costs and Expenses 7.4 15.5 7.8
Deductions (2.4) 0 0
Other Adjustments 6.2 0 0
Balance at End of Period $ 48.6 $ 37.4 $ 21.9