Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Additional Details (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015
Subsidiary or Equity Method Investee [Line Items]
Insurance Reserves	$ 1,751.3	$ 1,856.0
Impairment of Intangible Assets, Finite-lived	(15.4)	(60.2)	$ 0.0
Debt Issuance Costs, Net	87.0
Available For Sale Securities Carrying Value	52.2
Asset Impairment Charges	$ 27.1	153.3	2.1
FGL [Member]
Subsidiary or Equity Method Investee [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	19.60%
Spectrum Brands [Member]
Subsidiary or Equity Method Investee [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	42.20%
HGI
Subsidiary or Equity Method Investee [Line Items]
Gain On Contingent Purchase Price Adjustment	$ 0.0	8.5	$ 0.5
Building and Building Improvements | Minimum [Member]
Subsidiary or Equity Method Investee [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	20 years
Building and Building Improvements | Maximum
Subsidiary or Equity Method Investee [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	40 years
Machinery, equipment and other | Minimum [Member]
Subsidiary or Equity Method Investee [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	2 years
Machinery, equipment and other | Maximum
Subsidiary or Equity Method Investee [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	15 years
Compass | HGI
Subsidiary or Equity Method Investee [Line Items]
Business Acquisition Percentage Of Equity Interests Acquired	74.40%
Customer Relationships [Member] | Minimum [Member]
Subsidiary or Equity Method Investee [Line Items]
Amortization period, intangible asset	2 years
Customer Relationships [Member] | Maximum
Subsidiary or Equity Method Investee [Line Items]
Amortization period, intangible asset	20 years
Technology Assets [Member] | Minimum [Member]
Subsidiary or Equity Method Investee [Line Items]
Amortization period, intangible asset	4 years
Technology Assets [Member] | Maximum
Subsidiary or Equity Method Investee [Line Items]
Amortization period, intangible asset	18 years
Trade Name [Member] | Minimum [Member]
Subsidiary or Equity Method Investee [Line Items]
Amortization period, intangible asset	8 years
Trade Name [Member] | Maximum
Subsidiary or Equity Method Investee [Line Items]
Amortization period, intangible asset	17 years
Global Auto Care [Member]
Subsidiary or Equity Method Investee [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	12.00%
FGL [Member] | Majority-Owned Subsidiary, Unconsolidated [Member]
Subsidiary or Equity Method Investee [Line Items]
Insurance Reserves	$ 1,119.5	1,226.8
Fixed Maturities Available For Sale [Member]
Subsidiary or Equity Method Investee [Line Items]
Available For Sale Securities Carrying Value	1,535.1	1,638.1
Fixed Maturities Available For Sale [Member] | Third party cedants [Member]
Subsidiary or Equity Method Investee [Line Items]
Available For Sale Securities Carrying Value	$ 654.3	624.5
Accounting Standards Update 2015-03 [Member]
Subsidiary or Equity Method Investee [Line Items]
Debt Issuance Costs, Net		101.8
Adjustments for New Accounting Principle, Early Adoption [Member]
Subsidiary or Equity Method Investee [Line Items]
Unrecognized Tax Benefits that Would Result in Deferred Tax Assets		0.0
Accounting Standards Update 2016-09 [Member]
Subsidiary or Equity Method Investee [Line Items]
Unrecognized Tax Benefits that Would Result in Deferred Tax Assets		(28.4)		$ (4.3)
Accounting Standards Update 2015-17 [Member]
Subsidiary or Equity Method Investee [Line Items]
Deferred Tax Assets, Net		39.1
Discontinued Operations, Held-for-sale [Member] | Accounting Standards Update 2015-03 [Member]
Subsidiary or Equity Method Investee [Line Items]
Debt Issuance Costs, Net		$ 4.1