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Derivative Financial Instruments - Additional Information (Detail)
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2018
EUR (€)
Derivative Financial Instruments [Line Items]            
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ (2.8)          
Document Period End Date     Mar. 31, 2018      
Long-term debt 5,404.2   $ 5,404.2   $ 5,801.9  
Spectrum Brands [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (18.4) $ (10.4) (19.2) $ 32.8    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (0.2) 0.2 0.4 0.3    
Spectrum Brands [Member] | Interest Rate Contract [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     $ 0.6      
Derivative, Fixed Interest Rate 0.00%   0.00%     0.00%
Derivative, Notional Amount $ 300.0   $ 300.0   $ 300.0  
Derivative, Remaining Maturity     2 years 1 month   2 years 7 months  
Spectrum Brands [Member] | Foreign exchange contracts            
Derivative Financial Instruments [Line Items]            
Accumulated Other Comprehensive Income Loss Cumulative Gain Loss From Derivative Instrument Before Tax     $ 0.1      
Derivative Contracts Market Value 63.3   63.3   $ 67.5  
Spectrum Brands [Member] | Foreign exchange forward agreements            
Derivative Financial Instruments [Line Items]            
Derivative Contracts Market Value 82.3   82.3   62.9  
Spectrum Brands [Member] | Zinc Commodity Swap Contract [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     0.1      
Spectrum Brands [Member] | Bronze Commodity Contract [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Contracts Market Value 5.5   5.5   6.6  
Derivatives not designated as hedging instrument            
Derivative Financial Instruments [Line Items]            
Derivative Asset, Fair Value, Gross Asset 3.7   3.7   $ 1.5  
Discontinued Operations [Member] | Spectrum Brands [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net   3.6 (6.1) 8.3    
Discontinued Operations [Member] | Spectrum Brands [Member] | Foreign exchange contracts            
Derivative Financial Instruments [Line Items]            
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (4.8) 2.9 (8.9) 7.1    
Discontinued Operations [Member] | Spectrum Brands [Member] | Commodity contracts            
Derivative Financial Instruments [Line Items]            
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ 1.3 $ 1.4 $ 2.5 $ 2.2    
Four Point Zero Percent Senior Notes [Member] | Spectrum Brands [Member] | Unsecured Debt [Member]            
Derivative Financial Instruments [Line Items]            
Long-term debt, interest rate 4.00%   4.00%   4.00% 4.00%
Four Point Zero Percent Senior Notes [Member] | Spectrum Brands [Member] | Secured Debt [Member]            
Derivative Financial Instruments [Line Items]            
Long-term debt, interest rate 4.00%   4.00%     4.00%
Four Point Zero Percent Senior Notes [Member] | Euro Member Countries, Euro | Spectrum Brands [Member] | Unsecured Debt [Member]            
Derivative Financial Instruments [Line Items]            
Long-term debt $ 522.8   $ 522.8   $ 500.9 € 425.0