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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Millions		9 Months Ended
		Jun. 30, 2015	Sep. 30, 2014
Derivatives, Fair Value [Line Items]
Document Period End Date		Jun. 30, 2015
Derivatives		$ 220.4	$ 296.3
Other invested assets		442.4	165.0
Call options [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		220.1	7,602.6
Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		6.2	14.2
Total liability derivatives		4.6	1.9
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		0.0	0.6
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Accounts payable and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		1.8	1.8
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		0.4	0.0
Derivatives designated as hedging instruments [Member] | Commodity swap and option agreements [Member] | Receivables, net [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		0.0	1.3
Derivatives designated as hedging instruments [Member] | Foreign exchange forward agreements [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		0.3	0.3
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Receivables, net [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		5.9	12.0
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		0.4	0.0
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		0.4	0.0
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Accounts payable and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		1.5	0.1
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		0.1	0.0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		248.6	324.1
Total liability derivatives		2,178.5	1,910.9
Not Designated as Hedging Instrument [Member] | Foreign exchange forward agreements [Member] | Accounts payable and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		0.2	0.1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Receivables, net [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		0.0	0.5
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Receivables, net [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives			1.9
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Derivatives For Trading And Investment [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		10.3
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		0.0	0.3
Not Designated as Hedging Instrument [Member] | Call options [Member] | Derivatives For Trading And Investment [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		220.1	296.3
Not Designated as Hedging Instrument [Member] | FIA embedded derivatives [Member] | Contractholder funds [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		2,173.7	1,908.1
Not Designated as Hedging Instrument [Member] | Futures contracts [Member] | Derivatives For Trading And Investment [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		0.3	0.0
Not Designated as Hedging Instrument [Member] | Futures contracts [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liability derivatives		0.0	0.5
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives For Trading And Investment [Member]
Derivatives, Fair Value [Line Items]
Total asset derivatives		11.7	11.2
Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Contingent Purchase Price Reduction Receivable Fair Value Disclosure		0.0	41.5
Funds Withheld Receivable	[1]	641.7	154.4
Assets, Fair Value Disclosure, Recurring		19,238.2	18,501.7
Liabilities, Fair Value Disclosure, Recurring		2,773.1	2,062.2
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivatives		0.0	0.6
Fair Value, Measurements, Recurring [Member] | Commodity Option [Member]
Derivatives, Fair Value [Line Items]
Derivatives		10.3	3.2
Derivative Liability		1.6	0.4
Fair Value, Measurements, Recurring [Member] | Foreign exchange forward agreements [Member]
Derivatives, Fair Value [Line Items]
Derivatives			12.8
Derivative Liability		1.0	0.5
Fair Value, Measurements, Recurring [Member] | Call options [Member]
Derivatives, Fair Value [Line Items]
Derivatives		220.4	296.3
Fair Value, Measurements, Recurring [Member] | Available For Sale Embedded Derivatives [Member]
Derivatives, Fair Value [Line Items]
Equity securities - available-for-sale		579.6	663.6
Fair Value, Measurements, Recurring [Member] | Fixed Index Annuity [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability		2,173.7	1,908.1
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability		2.2	1.8
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Funds Withheld Receivable	[1]	45.8	0.0
Assets, Fair Value Disclosure, Recurring		527.8	279.3
Liabilities, Fair Value Disclosure, Recurring		0.0	0.0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Available For Sale Embedded Derivatives [Member]
Derivatives, Fair Value [Line Items]
Equity securities - available-for-sale		26.7	59.2
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Funds Withheld Receivable	[1]	595.9	154.4
Assets, Fair Value Disclosure, Recurring		17,562.3	17,156.4
Liabilities, Fair Value Disclosure, Recurring		4.8	2.8
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivatives		0.0	0.6
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Option [Member]
Derivatives, Fair Value [Line Items]
Derivatives		10.3	3.2
Derivative Liability		1.6	0.4
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign exchange forward agreements [Member]
Derivatives, Fair Value [Line Items]
Derivatives			12.8
Derivative Liability		1.0	0.5
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Call options [Member]
Derivatives, Fair Value [Line Items]
Derivatives		220.4	296.3
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Available For Sale Embedded Derivatives [Member]
Derivatives, Fair Value [Line Items]
Equity securities - available-for-sale		546.9	598.4
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Future Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability			0.1
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability		2.2	1.8
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Funds Withheld Receivable	[1]	0.0	0.0
Assets, Fair Value Disclosure, Recurring		1,148.1	1,066.0
Liabilities, Fair Value Disclosure, Recurring		2,768.3	2,059.4
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Index Annuity [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability		2,173.7	1,908.1
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability		594.6	151.3
Contingent Purchase Price Reduction Receivable [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Contingent Purchase Price Reduction Receivable Fair Value Disclosure		0.0	41.5
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		1,887.5	1,792.9
Asset-backed Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		1,854.4	1,755.9
Asset-backed Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		33.1
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		821.6	636.9
Commercial Mortgage Backed Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		681.5	553.8
Commercial Mortgage Backed Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		140.1
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		9,551.1	9,795.8
Corporate Debt Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		8,634.2	8,945.8
Corporate Debt Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		916.9	850.0
Hybrids [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		1,241.1	1,316.1
Hybrids [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		1,241.1	1,316.1
Hybrids [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		0.0	0.0
Municipals [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		1,450.6	1,259.8
Municipals [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		1,413.1	1,222.6
Municipals [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities			37.2
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		2,175.4	2,114.0
Residential Mortgage Backed Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		2,175.4	2,114.0
Broker Quoted [Member] | Asset-backed Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		33.1	37.0
Broker Quoted [Member] | Commercial Mortgage Backed Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		140.1	83.1
Broker Quoted [Member] | Equity Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Available For Sale Embedded Derivatives [Member]
Derivatives, Fair Value [Line Items]
Equity securities - available-for-sale		6.0	6.0
Market Pricing [Member] | Municipal Bonds [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		37.5
U.S. Government securities [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		596.3	296.0
U.S. Government securities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		413.4	115.6
U.S. Government securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale Securities		182.9	180.4
Equity [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Trading Securities		41.9	104.5
Equity [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Trading Securities		41.9	104.5
Other Invested Assets [Member]
Derivatives, Fair Value [Line Items]
Trading Securities			165.0
Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Other invested assets		14.5	13.3
Other Invested Assets [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Other invested assets		0.0	0.0
Other Invested Assets [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Other invested assets			2.1
Other Invested Assets [Member] | Other Invested Assets [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Derivatives, Fair Value [Line Items]
Other invested assets		14.5	11.2
Other Invested Assets [Member] | Option Pricing [Member] | Other Invested Assets [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Nomura Fund Linked Note [Member]
Derivatives, Fair Value [Line Items]
Other invested assets		11.7
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability		$ 594.6	151.3
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Future Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability			$ 0.1
[1] (a) included in other assets in the accompanying unaudited condensed Consolidated Balance Sheets.

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