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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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