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Securitizations and Variable Interest Entities - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Feb. 27, 2015
Variable Interest Entity [Line Items] |  |  |
Long-term debt | $ 5,870.9 | $ 5,635.6 |
Document Period End Date | Sep. 30, 2017 |  |
Gain (Loss) on Extinguishment of Debt |  | (8.0) |
Salus Capital Partners LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term debt | $ 22.2 | 30.3 |
Cash | 2.0 |  |
Variable Interest Entity, Primary Beneficiary | Salus Capital Partners LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Asset-Backed Loans Receivable | 0.0 | 29.3 |
Collateralized Loan Obligations [Member] | Salus Capital Partners LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term debt |  |  | $ 578.5
Unaffiliated long-term debt of consolidated variable-interest entity | Salus Capital Partners LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term debt | 28.9 | 39.7 |
Unsecured Debt [Member] | Variable Interest Entity, Primary Beneficiary | Salus Capital Partners LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE, consolidated carrying amount obligations | 99.2 | 135.2 |
FGL [Member] | Salus Capital Partners LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term debt | $ 48.1 | $ 65.9 |

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