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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 6 Months Ended
Dec. 01, 2015
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
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   6,353.8   6,353.8     $ 6,439.1
Goodwill   2,494.1   2,494.1     2,487.4
Compass Production Partners [Member]              
Business Acquisition [Line Items]              
Proceeds from Sale of Oil and Gas Property and Equipment $ 147.5     4.5      
Transaction costs, Sale of Oil and Gas Properties $ 1.9            
Gain (Loss) on Disposition of Oil and Gas Property       105.6      
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   $ 160.0   160.0      
Compass Production Partners [Member] | Revolving Credit Facility [Member]              
Business Acquisition [Line Items]              
Repayments of Debt       $ 167.0      
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%      
FGL [Member] | Anbang Insurance Group Co., Ltd. [Member]              
Business Acquisition [Line Items]              
Business Acquisition, Share Price           $ 26.80