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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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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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