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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, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Funds Withheld Receivable | $ 1,650.4 | $ 1,710.1 |
Asset Backed Loans And Other Invested Assets Gross | 46.0 | 274.6 |
Asset Backed Loans And Other Invested Assets | 35.0 | 226.7 |
Available For Sale Securities Carrying Value | $ 52.2 |  |
Indefinite-lived Intangible Assets Acquired |  |  | $ 341.5
Goodwill, Acquired During Period |  |  | $ 1,054.7
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 | 18 years 6 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 2 months 6 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 | 11 years 4 months 12 days |  |
Global batteries and appliances [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 157.00% |  |
Hardware and home improvement [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 110.00% |  |
Global Pet Supplies [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 58.00% |  |
Home and Garden [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 326.00% |  |
Spectrum Brands [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 4.7 |  |
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 |

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