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Related Party Transactions Addtional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | May 21, 2015 | Sep. 30, 2014
Related Party Transaction [Line Items] |  |  |  |  |
Common stock repurchased |  |  | $ (22.2) |  |
Common stock, shares, issued |  | 200,789,100 | 201,383,800 |  |
Document Period End Date | Sep. 30, 2017 |  |  |  |
Long-term debt | $ 5,870.9 | $ 5,635.6 |  |  |
Jefferies [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investment Advisory, Management and Administrative Fees | 3.0 |  |  |  |
Fees and Commissions | 1.0 |  |  |  |
HCP Stockholders [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses related to Services Agreement |  |  | $ 3.3 |  |
HGI |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock repurchased | 0.0 | 0.0 | (22.1) |  |
Long-term debt | 1,718.3 | $ 1,711.2 |  |  |
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 |  |  |
Fixed Maturities Securities | Fortress Investment Group [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net Investment Income | 11.6 | 11.0 | 9.5 |  |
Related Party Transaction, Due from (to) Related Party, Noncurrent | 176.3 | 227.5 |  |  |
Severance Cost, one time payments [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Severance Costs | $ 3.0 |  | 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 |  |  |
Common Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares, issued | 200,600,000 | 200,800,000 | 201,400,000 |  | 202,300,000
Common Stock | Spectrum Brands [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 575.0 |  |  |
Five Point Seven Five Percent Senior Notes Due July 15 2025 [Member] | Spectrum Brands [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Long-term debt, interest rate | 5.75% | 5.80% |  |  |
Long-term debt | $ 1,000.0 | $ 1,000.0 |  |  |
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% |  |  |
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% | 4.00% |  |  |
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 |  |  |
FGL [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Revenue |  |  | $ 947.2 |  |
Net Investment Income | FGL [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Revenue |  |  | $ 923.0 |  |

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