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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Related Party Transaction [Line Items] |  |  |
Document Period End Date | Dec. 31, 2016 |  |
Long-term Debt | $ 5,563.4 |  | $ 5,540.7
Fortress Investment Group [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Net Investment Income | 0.3 | $ 0.3 |
Fixed Maturities [Member] | Fortress Investment Group [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Due from (to) Related Party, Noncurrent | 228.6 |  | 203.2
Net Investment Income | 3.0 | 2.2 |
Funds Withheld Receivables [Member] | Front Street Re (Delaware) Ltd. [Member] | Fortress Investment Group [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Due from (to) Related Party, Noncurrent | 18.1 |  | $ 18.0
FGL [Member] | Fortress Investment Group [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Disposal Group, Including Discontinued Operation, Interest Income |  | $ 2.0 |
Investment Income [Member] | FGL [Member] | Fortress Investment Group [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Disposal Group, Including Discontinued Operation, Interest Income | $ 2.7 |  |

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- Definition 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 + Details
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- Definition Amount of receivables to be collected from related parties net of obligations owed to related parties after one year or beyond the normal operating cycle, if longer where one party can exercise control or significant influence over another party including, but not limited to, affiliates, owners or officers and their immediate families and pension trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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