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Securitizations and Variable Interest Entities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Feb. 27, 2015
Variable Interest Entity [Line Items]
Long-term debt	$ 5,915.1	$ 5,802.2
Document Period End Date	Dec. 31, 2017
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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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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