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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |
Document Period End Date |  | Dec. 31, 2016 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | $ 46.4 | $ 65.1 | $ 78.1 |  | $ 91.6
Assets |  |  |  |  |  |
Cash and cash equivalents |  | 348.8 | 566.5 | 497.3 |  | 661.2
Liabilities |  |  |  |  |  |
Debt |  | 5,459.0 |  | 5,430.9 | [1],[2] |
Derivatives, Liabilities |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | (1.3) | 0.6 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 3.0 | 5.0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | (6.3) | (26.6) |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  | (5.5) |  |  |
Net transfer In (Out) of Level 3 (a) |  | (27.1) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  | 755.7 | 768.9 |  |  | 771.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | (22.6) | (6.1) |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0.0 | 0.0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  | 0.0 | 0.0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  | 0.0 | 0.0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  | 15.3 | (3.5) |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net |  | 0.0 | 0.0 |  |  |
Funds Withheld Receivable |  | 1,609.0 |  | 1,650.4 |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  |  |  |  | 14.1
Derivatives, Liabilities |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | (0.5) |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | (13.6) |  |  |
Other Invested Assets [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 0.0 |  |  | 2.8
Derivatives, Liabilities |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 2.7 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | 0.0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  | 0.0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | 0.0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  | (5.5) |  |  |
Net transfer In (Out) of Level 3 (a) |  |  | 0.0 |  |  |
Level 2 [Member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Total debt | [1],[2] | 5,677.7 |  | 5,700.1 |  |
Level 3 [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Policy loans and other invested assets |  | 8.3 |  |  |  |
Asset-backed loans | [1] | 13.7 |  | 35.0 |  |
Liabilities |  |  |  |  |  |
Total debt | [1],[2] | 23.3 |  | 29.1 |  |
Derivatives, Liabilities |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [1] | 897.7 |  | 922.9 |  |
Level 3 [Member] | Policy Loans [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Policy loans and other invested assets |  |  |  | 8.5 |  |
Recurring [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 757.1 |  | 766.2 |  |
Funds Withheld Receivable |  | 1,532.8 |  | 1,535.1 |  |
Assets, Fair Value Disclosure, Recurring |  | 1,566.9 |  | 1,561.0 |  |
Recurring [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | 0.5 |  | 2.0 |  |
Recurring [Member] | Commodity Option [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 3.3 |  | 2.9 |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | 0.2 |  | 0.1 |  |
Recurring [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 12.2 |  | 11.3 |  |
Recurring [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 8.3 |  | 5.9 |  |
Recurring [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | 0.7 |  | 1.1 |  |
Recurring [Member] | Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 10.3 |  | 5.8 |  |
Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Total financial assets |  | 0.0 |  | 0.0 |  |
Derivatives, Liabilities |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | 0.0 |  | 0.0 |  |
Liabilities, Fair Value Disclosure, Recurring |  | 0.0 |  | 0.0 |  |
Funds Withheld Receivable |  | 79.6 |  | 69.9 |  |
Assets, Fair Value Disclosure, Recurring |  | 79.6 |  | 69.9 |  |
Recurring [Member] | Level 1 [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 0.0 |  | 0.0 |  |
Recurring [Member] | Level 1 [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 0.0 |  | 0.0 |  |
Recurring [Member] | Level 1 [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | 121.2 |  | 131.2 |  |
Recurring [Member] | Level 1 [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  |  |  | 0.0 |  |
Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Total financial assets |  | 0.0 |  | 0.0 |  |
Derivatives, Liabilities |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | 5,677.7 |  | 5,700.1 |  |
Liabilities, Fair Value Disclosure, Recurring |  | 1.4 |  | 3.2 |  |
Funds Withheld Receivable |  | 1,406.8 |  | 1,387.1 |  |
Assets, Fair Value Disclosure, Recurring |  | 1,440.9 |  | 1,413.0 |  |
Recurring [Member] | Level 2 [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | 0.5 |  | 2.0 |  |
Recurring [Member] | Level 2 [Member] | Commodity Option [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 3.3 |  | 2.9 |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | 0.2 |  | 0.1 |  |
Recurring [Member] | Level 2 [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 12.2 |  | 11.3 |  |
Recurring [Member] | Level 2 [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 8.3 |  | 5.9 |  |
Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | 0.7 |  | 1.1 |  |
Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 10.3 |  | 5.8 |  |
Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Total financial assets |  | 22.0 |  | 43.5 |  |
Derivatives, Liabilities |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | 921.0 |  | 952.0 |  |
Liabilities, Fair Value Disclosure, Recurring |  | 755.7 |  | 763.0 |  |
Funds Withheld Receivable |  | 46.4 |  | 78.1 |  |
Assets, Fair Value Disclosure, Recurring |  | 46.4 |  | 78.1 |  |
Recurring [Member] | Level 3 [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 0.0 |  | 0.0 |  |
Recurring [Member] | Level 3 [Member] | Call options [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  | 0.0 |  | 0.0 |  |
Recurring [Member] | Level 3 [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | 121.2 |  | 131.2 |  |
Recurring [Member] | Level 3 [Member] | Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |
Derivatives |  |  |  | 0.0 |  |
Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  | 634.5 | 629.0 | 631.8 |  | $ 629.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | (12.6) | (3.7) |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  | 15.3 | $ (3.5) |  |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Policy loans and other invested assets |  | 8.3 |  |  |  |
Asset-backed loans | [1] | 13.7 |  | 35.0 |  |
Liabilities |  |  |  |  |  |
Total debt | [1],[2] | 5,701.0 |  | 5,729.2 |  |
Derivatives, Liabilities |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [1] | 897.7 |  | 922.9 |  |
Estimate of Fair Value Measurement [Member] | Policy Loans [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Policy loans and other invested assets |  |  |  | 8.5 |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Total financial assets |  | 22.0 |  | 43.5 |  |
Derivatives, Liabilities |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | 6,598.7 |  | 6,652.1 |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | 634.5 |  | 631.8 |  |
Reported Value Measurement [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Policy loans and other invested assets |  | 8.3 |  |  |  |
Asset-backed loans | [1] | 13.7 |  | 35.0 |  |
Total financial assets |  | 22.0 |  |  |  |
Liabilities |  |  |  |  |  |
Total debt | [1],[2] | 5,459.0 |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [1] | 966.2 |  | 988.3 |  |
Financial Liabilities Fair Value Disclosure |  | 6,425.2 |  |  |  |
Reported Value Measurement [Member] | Policy Loans [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Policy loans and other invested assets |  |  |  | 8.5 |  |
Reported Value Measurement [Member] | Recurring [Member] |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |
Total financial assets |  |  |  | 43.5 |  |
Derivatives, Liabilities |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  |  |  | 6,419.2 |  |
Discounted Cash Flow [Member] | Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Funds Withheld Receivable |  | 5.3 |  | 5.4 |  |
Discounted Cash Flow [Member] | Recurring [Member] | Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |
Derivative Liability |  | $ 634.5 |  | $ 631.8 |  |
[1] | The carrying value of cash and cash equivalents, trade receivables, accounts payable and accrued investment income approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.
[2] | The fair value of debt set forth above is generally based on quoted or observed market prices.

X
- 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 This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: 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=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + 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=73719730&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=73719730&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, after the 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 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 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: 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=73719730&loc=d3e13495-108611 Reference 3: 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 4: 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=73719730&loc=d3e13433-108611 Reference 5: 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 6: 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 + Details
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