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Other Assets - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Sep. 30, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Long-term debt | $ 5,404.2 | $ 5,801.9
Deferred charges and other assets | $ 60.8 | $ 43.7

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