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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 | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  | Mar. 31, 2017 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | $ 49.1 |  | $ 64.5 | $ 49.1 |  | $ 64.5 | $ 46.4 | $ 78.1 |  | $ 65.1 | $ 91.6
Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 320.3 |  | 457.5 | 320.3 |  | 457.5 |  | 497.3 |  |  | 661.2
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Debt |  | 5,623.9 |  |  | 5,623.9 |  |  |  | 5,430.9 | [1],[2] |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  |  | (0.3) | (1.3) |  | 0.3 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 6.1 |  | 3.1 | 9.1 |  | 8.1 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | (1.0) |  | (3.4) | (7.3) |  | (30.0) |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  |  |  |  |  | (5.5) |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | (2.4) | [3] |  | (29.5) | [4] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  | 782.2 |  | 790.5 | 782.2 |  | 790.5 | 755.7 | 763.0 |  | 768.9 | 771.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | 20.9 |  | 20.5 | (1.7) |  | 14.4 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  | 5.6 |  | 1.1 | 20.9 |  | (4.6) |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net |  | 0.0 | [3] | 0.0 | 0.0 | [4] | 0.0 |  |  |  |  |
Funds Withheld Receivable |  | 1,634.2 |  |  | 1,634.2 |  |  |  | 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 |  |  | 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] | 5,867.8 |  |  | 5,867.8 |  |  |  | 5,700.1 |  |  |
Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Policy loans and other invested assets | [1] | 8.3 |  |  | 8.3 |  |  |  | 8.5 |  |  |
Asset-backed loans | [1] | 6.3 |  |  | 6.3 |  |  |  | 35.0 |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Total debt | [1],[2] | 10.1 |  |  | 10.1 |  |  |  | 29.1 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [1] | 882.6 |  |  | 882.6 |  |  |  | 922.9 |  |  |
Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 784.4 |  |  | 784.4 |  |  |  | 766.2 |  |  |
Funds Withheld Receivable |  | 1,543.4 |  |  | 1,543.4 |  |  |  | 1,535.1 |  |  |
Assets, Fair Value Disclosure, Recurring |  | 1,576.1 |  |  | 1,576.1 |  |  |  | 1,561.0 |  |  |
Recurring [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 2.1 |  |  | 2.1 |  |  |  | 2.0 |  |  |
Recurring [Member] | Commodity Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 4.3 |  |  | 4.3 |  |  |  | 2.9 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 0.1 |  |  | 0.1 |  |  |  | 0.1 |  |  |
Recurring [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 13.3 |  |  | 13.3 |  |  |  | 11.3 |  |  |
Recurring [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 10.5 |  |  | 10.5 |  |  |  | 5.9 |  |  |
Recurring [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 121.0 |  |  | 121.0 |  |  |  | 131.2 |  |  |
Recurring [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  |  |  |  |  | 1.1 |  |  |
Recurring [Member] | Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 4.6 |  |  | 4.6 |  |  |  | 5.8 |  |  |
Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Total financial assets |  | 0.0 |  |  | 0.0 |  |  |  | 0.0 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | 0.0 |  |  | 0.0 |  |  |  | 0.0 |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 0.0 |  |  | 0.0 |  |  |  | 0.0 |  |  |
Funds Withheld Receivable |  | 80.5 |  |  | 80.5 |  |  |  | 69.9 |  |  |
Assets, Fair Value Disclosure, Recurring |  | 80.5 |  |  | 80.5 |  |  |  | 69.9 |  |  |
Recurring [Member] | Level 1 [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 0.0 |  |  | 0.0 |  |  |  | 0.0 |  |  |
Recurring [Member] | Level 1 [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 0.0 |  |  | 0.0 |  |  |  | 0.0 |  |  |
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 |  |  |  | 0.0 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | 5,867.8 |  |  | 5,867.8 |  |  |  | 5,700.1 |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 2.2 |  |  | 2.2 |  |  |  | 3.2 |  |  |
Funds Withheld Receivable |  | 1,413.8 |  |  | 1,413.8 |  |  |  | 1,387.1 |  |  |
Assets, Fair Value Disclosure, Recurring |  | 1,446.5 |  |  | 1,446.5 |  |  |  | 1,413.0 |  |  |
Recurring [Member] | Level 2 [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 2.1 |  |  | 2.1 |  |  |  | 2.0 |  |  |
Recurring [Member] | Level 2 [Member] | Commodity Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 4.3 |  |  | 4.3 |  |  |  | 2.9 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 0.1 |  |  | 0.1 |  |  |  | 0.1 |  |  |
Recurring [Member] | Level 2 [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 13.3 |  |  | 13.3 |  |  |  | 11.3 |  |  |
Recurring [Member] | Level 2 [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 10.5 |  |  | 10.5 |  |  |  | 5.9 |  |  |
Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  |  |  |  |  | 1.1 |  |  |
Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 4.6 |  |  | 4.6 |  |  |  | 5.8 |  |  |
Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Total financial assets |  | 14.6 |  |  | 14.6 |  |  |  | 43.5 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | 892.7 |  |  | 892.7 |  |  |  | 952.0 |  |  |
Liabilities, Fair Value Disclosure, Recurring |  | 782.2 |  |  | 782.2 |  |  |  | 763.0 |  |  |
Funds Withheld Receivable |  | 49.1 |  |  | 49.1 |  |  |  | 78.1 |  |  |
Assets, Fair Value Disclosure, Recurring |  | 49.1 |  |  | 49.1 |  |  |  | 78.1 |  |  |
Recurring [Member] | Level 3 [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 0.0 |  |  | 0.0 |  |  |  | 0.0 |  |  |
Recurring [Member] | Level 3 [Member] | Call options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | 0.0 |  |  | 0.0 |  |  |  | 0.0 |  |  |
Recurring [Member] | Level 3 [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 121.0 |  |  | 121.0 |  |  |  | 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 |  | 661.2 |  | 654.0 | 661.2 |  | 654.0 | $ 634.5 | 631.8 |  | $ 629.0 | $ 629.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | 21.1 |  | 23.9 | 8.5 |  | 20.2 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  | 5.6 |  | $ 1.1 | 20.9 |  | $ (4.6) |  |  |  |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Policy loans and other invested assets | [1] | 8.3 |  |  | 8.3 |  |  |  | 8.5 |  |  |
Asset-backed loans | [1] | 6.3 |  |  | 6.3 |  |  |  | 35.0 |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Total debt | [1],[2] | 5,877.9 |  |  | 5,877.9 |  |  |  | 5,729.2 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [1] | 882.6 |  |  | 882.6 |  |  |  | 922.9 |  |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Total financial assets |  | 14.6 |  |  | 14.6 |  |  |  | 43.5 |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | 6,760.5 |  |  | 6,760.5 |  |  |  | 6,652.1 |  |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | 661.2 |  |  | 661.2 |  |  |  | 631.8 |  |  |
Reported Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Policy loans and other invested assets | [1] | 8.3 |  |  | 8.3 |  |  |  | 8.5 |  |  |
Asset-backed loans | [1] | 6.3 |  |  | 6.3 |  |  |  | 35.0 |  |  |
Total financial assets |  | 14.6 |  |  | 14.6 |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Total debt | [1],[2] | 5,623.9 |  |  | 5,623.9 |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | [1] | 946.0 |  |  | 946.0 |  |  |  | 988.3 |  |  |
Financial Liabilities Fair Value Disclosure |  | 6,569.9 |  |  | 6,569.9 |  |  |  |  |  |  |
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] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability |  | $ 661.2 |  |  | $ 661.2 |  |  |  | $ 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.
[3] | (a) During the three months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.
[4] | (a) During the six months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.

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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