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Other Assets - Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Long-term debt | $ 5,801.9 | $ 5,575.4
Other assets | 43.7 | 62.8
Salus Capital Partners LLC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Long-term debt | $ 22.2 | $ 30.3
Credit Concentration Risk [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage Of Accounts Receivable Major Customers | 36.20% | 22.60%

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