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Other Required Disclosures - Schedule of Other Assets (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Sep. 30, 2012
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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

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