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Related Party Transactions Addtional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | May 21, 2015 | Dec. 13, 2013 | Sep. 30, 2013
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  | $ (22.2) | $ (65.8) |  |  |
Common stock, shares, issued |  |  | 200,789,100.00 | 201,383,800 |  |  |  |
Long-term debt |  |  | $ 5,540.7 | $ 6,112.1 |  |  |  |
Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Expense Related to Distribution or Servicing and Underwriting Fees |  |  | 12.9 |  |  |  |  |
FGL [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  |  |  |  |  | $ 17.00 |
Shares Offered To Public In Initial Offering |  |  |  |  |  |  | 9,800,000 |
Shares Offered To Underwriters In Initial Offering |  |  |  |  |  |  | 1,500,000 |
HCP Stockholders [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Expenses related to Services Agreement |  |  |  | 3.3 | 5.7 |  |  |
HGI |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Common stock repurchased |  |  | 0.0 | (22.1) | (65.6) |  |  |
Long-term debt |  |  | $ 1,711.2 | 1,705.1 |  |  |  |
HC2 Holdings Inc. [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  |  | 1,200,000 |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  | $ 35.1 |  |  |  |  |
Proceeds from sale of equity securities, price per share |  |  | $ 7.50 |  |  |  |  |
HC2 Holdings Inc. [Member] | Harbinger Capital Partners [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  |  | 540,000 |  |  |  |  |
Front Street RE (Cayman) Ltd. [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  | $ 14.0 |  |  |  |  |
Preferred Stock [Member] | HCP Stockholders [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  | 23,000,000 |  |  |  |  |  |
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 |  |  | 18.0 | 18.2 |  |  |  |
Fixed Maturities Securities | Fortress Investment Group [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net Investment Income |  |  | 11.0 | 9.5 | 1.6 |  |  |
Related Party Transaction, Due from (to) Related Party, Noncurrent |  |  | 203.2 | 182.6 |  |  |  |
Severance Cost, one time payments [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Severance Costs |  |  |  | 20.5 |  |  |  |
Severance Cost, Accrued Bonus [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Severance Costs |  |  |  | 16.5 |  |  |  |
Severance Cost, Future Bonus [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Severance Costs |  |  |  | 3.3 |  |  |  |
Bridge Loan [Member] | Spectrum Brands [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 1,500.0 |  |
Five Point Seven Five Percentage Senior Notes [Member] | Spectrum Brands [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payments for Commissions |  |  | 2.6 |  |  |  |  |
Seven Point Seven Five Percent Senior Unsecured Notes [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payments for Commissions |  |  |  | 0.3 |  |  |  |
7.875% Senior Secured Notes, due July 15, 2019 | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payments for Commissions |  |  |  | 0.7 |  |  |  |
Public offering of common stock [Member] | Spectrum Brands [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payments for Commissions |  |  | 1.5 |  |  |  |  |
AAG Acquisition [Member] | Spectrum Brands [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payments for Commissions |  |  |  | 2.1 |  |  |  |
Four Point Zero Percent Senior Notes [Member] | Spectrum Brands [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payments for Commissions |  |  | 0.3 |  |  |  |  |
Real Estate Investments [Member] | Spectrum Brands [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Asset Management Fees |  |  | 0.4 |  |  |  |  |
Fortress Investment Group [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net Investment Income |  |  | $ 1.1 | $ 1.4 | $ 0.2 |  |  |
Common Stock |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Common stock, shares, issued |  |  | 200,800,000 | 201,400,000 | 202,300,000 |  |  | 142,400,000
Common Stock | Spectrum Brands [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 575.0 |  |  |  |
7.875% Senior Secured Notes, due July 15, 2019 | Secured Debt [Member] | HGI |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  | 7.875% | 7.90% |  |  |  |
Long-term debt |  |  | $ 864.4 |  |  |  |  |
Four Point Zero Percent Senior Notes [Member] | Spectrum Brands [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 425.0 |  |  |  |  |
Four Point Zero Percent Senior Notes [Member] | Secured Debt [Member] | Spectrum Brands [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  | 4.00% | 0.00% |  |  |  |
Long-term debt |  |  | $ 477.0 | $ 0.0 |  |  |  |
Seven Point Seven Five Percent Senior Unsecured Notes [Member] | HGI |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  | 7.75% | 7.75% |  |  |  |
Long-term debt |  |  | $ 890.0 | $ 890.0 |  |  |  |
FGL [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Revenue |  |  | 1,147.0 | 996.5 | $ 1,190.8 |  |  |
FGL [Member] | Jefferies [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Interest Income |  |  |  |  | 1.2 |  |  |
Disposal Group, Including Discontinued Operation, Revenue | [1] |  | 5.8 |  |  |  |  |
FGL [Member] | Fortress Investment Group [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Interest Income |  |  |  | 8.1 | 1.4 |  |  |
FGL [Member] | Leucadia [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Interest Income |  |  |  |  | 1.1 |  |  |
Disposal Group, Including Discontinued Operation, Revenue | [1] |  | 1.6 |  |  |  |  |
Net Investment Income | FGL [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Revenue | [2] |  | 922.7 | $ 850.8 | $ 760.2 |  |  |
Net Investment Income | FGL [Member] | Fortress Investment Group [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Interest Income |  |  | $ 9.9 |  |  |  |  |
[1] | (b) Included in “Net investment gains (losses)” are charges related to the change in expected recovery rates of asset-based loans. Such charges are presented as “Impairments and bad debt expense” on the Company’s accompanying Consolidated Statements of Operations.
[2] | (a) Included in the net investment income attributable to FGL is interest income of $4.1, $4.5 and $4.5 for Fiscal 2016, 2015 and 2014, respectively, on debt instruments issued by entities consolidated by HRG as they will continue to exist following the closing of the FGL Merger. The corresponding interest expense is recorded in continuing operations in the accompanying Consolidated Statements of Operations.

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