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Other Required Disclosures - Schedule of Other Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Other Assets:    
Prepaid expenses and other current assets $ 168.5 $ 53.1
Debt issuance costs 94.2 50.9
Deferred charges and other assets 112.0 68.6
Total other assets $ 374.7 $ 172.6