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Securitizations and Variable Interest Entities - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017 | Feb. 27, 2015
Variable Interest Entity [Line Items] |  |  |
Long-term debt | $ 5,404.2 | $ 5,801.9 |
Document Period End Date | Mar. 31, 2018 |  |
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 | $ 77.0 | 28.9 |
FGL [Member] | Salus Capital Partners LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term debt |  | $ 48.1 |

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