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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Goodwill and Intangibles (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]      
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit   $ 9.9  
Deconsolidation, Gain (Loss), Amount $ 0.0 0.0 $ 38.5
Document Period End Date Sep. 30, 2017    
Funds Withheld Receivable   0.0  
Goodwill, Purchase Accounting Adjustments $ 0.0    
Goodwill, Acquired During Period   3.3  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     31.9
Customer Relationships [Member] | Weighted average      
Finite-Lived Intangible Assets [Line Items]      
Amortization period, intangible asset 17 years 11 months    
Customer Relationships [Member] | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Amortization period, intangible asset 20 years    
Technology Assets [Member] | Weighted average      
Finite-Lived Intangible Assets [Line Items]      
Amortization period, intangible asset 11 years 4 months 12 days    
Technology Assets [Member] | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Amortization period, intangible asset 18 years    
Trade Names [Member] | Weighted average      
Finite-Lived Intangible Assets [Line Items]      
Amortization period, intangible asset 6 years 2 months    
Hardware and home improvement [Member]      
Finite-Lived Intangible Assets [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 93.20%    
Global Pet Supplies [Member]      
Finite-Lived Intangible Assets [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 38.60%    
Home and Garden [Member]      
Finite-Lived Intangible Assets [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 352.30%    
Spectrum Brands [Member]      
Finite-Lived Intangible Assets [Line Items]      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 16.3 2.7  
FOH [Member]      
Finite-Lived Intangible Assets [Line Items]      
Impaired Financing Receivable, Recorded Investment     16.2
FOH [Member] | Trademarks and Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite-lived Intangible Assets Acquired     9.9
Goodwill, Acquired During Period     16.2
CorAmerica [Member]      
Finite-Lived Intangible Assets [Line Items]      
Goodwill and Intangible Asset Impairment   $ 10.7 $ 28.3