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Description of Business, Basis of Presentation and Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jul. 01, 2016 | Mar. 31, 2016 | Nov. 08, 2015 | Sep. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Oil and Gas Property |  | $ 0.0 | $ 0.0 | $ 105.6 | $ 0.0 |  |  |  |
Long-term debt |  | 6,059.9 |  | 6,059.9 |  |  |  |  | $ 6,439.1
Goodwill |  | $ 2,479.7 |  | $ 2,479.7 |  |  |  |  | 2,487.4
Document Period End Date |  |  |  | Jun. 30, 2016 |  |  |  |  |
Reinsurance Transactions, Percentage Ceded Under Agreement |  | 74.90% |  |  |  |  |  |  |
Funds Withheld Receivable |  | $ 1,661.0 |  | $ 1,661.0 |  |  |  |  | 1,710.1
Proceeds from Contributions from Parent |  |  |  | 110.0 |  |  |  |  |
Compass Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | 35.0 |  |  |  |  |
Front Street RE (Cayman) Ltd. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Funds Withheld Receivable |  | 83.0 |  | 83.0 |  |  |  |  |
HGI Energy Holdings, LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 92.0 |  | 92.0 |  |  | $ 100.0 |  |
CPP WI Holding Company, LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Share Price |  |  |  |  |  | $ 145,000,000 |  |  |
Compass Production Partners [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Oil and Gas Property and Equipment | $ 147.5 |  |  | 5.9 |  |  |  |  |
Transaction costs, Sale of Oil and Gas Properties | $ 1.9 |  |  |  |  |  |  |  |
Compass Production Partners [Member] | Compass Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Borrowing Capacity |  |  |  |  |  |  |  |  | $ 327.0
Line of Credit Facility, Fair Value of Amount Outstanding |  | $ 125.0 |  | $ 125.0 |  |  |  |  |
Spectrum Brands [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage Of Ownership Interest |  | 57.80% |  | 57.80% |  |  |  |  |
FGL [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage Of Ownership Interest |  | 80.40% |  | 80.40% |  |  |  | 0.00% |
FGL [Member] | Anbang Insurance Group Co., Ltd. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Share Price |  |  |  |  |  |  |  | $ 26.80 |

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