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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
	Apr. 17, 2017	Jun. 30, 2017	Jun. 30, 2017	May 06, 2017	Jan. 13, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Goodwill		$ 2,621.3	$ 2,621.3			$ 2,478.4
Document Period End Date			Jun. 30, 2017
Long-term Debt		6,133.6	$ 6,133.6			5,635.6
Margin Loan, due July 13, 2018 [Member]
Business Acquisition [Line Items]
Security Owned and Pledged as Collateral, Fair Value					$ 525.2
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%	99.50%
Front Street Re (Delaware) Ltd. [Member]
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses		$ 65.0
Spectrum Brands [Member]
Business Acquisition [Line Items]
Percentage Of Ownership Interest		58.90%	58.90%
Spectrum Brands [Member] | Secured Debt [Member]
Business Acquisition [Line Items]
Long-term debt, interest rate		6.625%	6.625%
FGL [Member]
Business Acquisition [Line Items]
Percentage Of Ownership Interest		80.40%	80.40%	50.00%
FS Holdco II Ltd. [Domain]
Business Acquisition [Line Items]
Due to Affiliate		$ 30.0	$ 30.0
Shaser, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Description			0.44
Business Combination, Consideration Transferred			$ 12.6
Petmatrix LLC [Member]
Business Acquisition [Line Items]
Goodwill		123.8	123.8
Business Combination, Consideration Transferred	$ 255.2
GloFish [Member]
Business Acquisition [Line Items]
Goodwill		$ 15.4	15.4
Business Combination, Consideration Transferred			53.9
Payments to Acquire Businesses, Gross			$ 49.7
FGL [Member] | CF Corporation [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price		$ 31.10	$ 31.10
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%	3.50%		2.35%	0.00%

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