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Description of Business, Basis of Presentation and Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2017	Jan. 13, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Goodwill	$ 2,473.8		$ 2,478.4
Document Period End Date	Mar. 31, 2017
Funds Withheld Receivable	$ 1,634.2		1,650.4
Long-term Debt	5,727.0		5,540.7
Margin Loan, due July 13, 2018 [Member]
Business Acquisition [Line Items]
Security Owned and Pledged as Collateral, Fair Value		$ 583.8
Margin Loan, due July 13, 2018 [Member] | Secured Debt [Member]
Business Acquisition [Line Items]
Debt Issuance Costs, Gross		1.1
Line of Credit Facility, Maximum Borrowing Capacity		150.0
Long-term Debt	$ 50.0	$ 50.0	$ 0.0
Zap Com Corporation [Member]
Business Acquisition [Line Items]
Percentage Of Ownership Interest	99.50%
Spectrum Brands [Member]
Business Acquisition [Line Items]
Percentage Of Ownership Interest	58.40%
FGL [Member]
Business Acquisition [Line Items]
Percentage Of Ownership Interest	80.40%
Interest Rate Cap [Member] | Margin Loan, due July 13, 2018 [Member] | Secured Debt [Member]
Business Acquisition [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.50%	2.35%	0.00%

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