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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Liabilities, Fair Value Disclosure | $ 755.7 |  | $ 763.0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at Beginning of Period | 78.1 | $ 91.6 |
Total Gains (Losses) Included in Earnings | (1.3) | 0.6 |
Purchases | 3.0 | 5.0 |
Sales | (6.3) | (26.6) |
Settlements |  | (5.5) |
Net transfer In (Out) of Level 3 (a) | (27.1) |  |
Balance at End of Period | 46.4 | 65.1 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at Beginning of Period |  | 771.5 |
Total Gains (Losses) Included in Earnings | (22.6) | (6.1) |
Total Gains (Losses) Included in AOCI | 0.0 | 0.0 |
Purchases | 0.0 | 0.0 |
Sales | 0.0 | 0.0 |
Settlements | (15.3) | 3.5 |
Net transfer In (Out) of Level 3 | 0.0 | 0.0 |
Balance at End of Period | 755.7 | 768.9 |
Front Street Future Policyholder Benefits Reserve [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at Beginning of Period | 631.8 | 629.2 |
Total Gains (Losses) Included in Earnings | (12.6) | (3.7) |
Settlements | (15.3) | 3.5 |
Balance at End of Period | 634.5 | 629.0 |
Fixed Index Annuity [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at Beginning of Period | 131.2 | 142.3 |
Total Gains (Losses) Included in Earnings | (10.0) | (2.4) |
Balance at End of Period | 121.2 | 139.9 |
Corporate Debt Securities [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at Beginning of Period |  | 14.1 |
Total Gains (Losses) Included in Earnings |  | (0.5) |
Sales |  | (13.6) |
Funds Withheld Receivables [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at Beginning of Period |  | 74.7 |
Total Gains (Losses) Included in Earnings |  | (1.6) |
Purchases |  | 5.0 |
Sales |  | (13.0) |
Balance at End of Period |  | 65.1 |
Other Invested Assets [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at Beginning of Period |  | 2.8 |
Total Gains (Losses) Included in Earnings |  | 2.7 |
Total Gains (Losses) Included in AOCI |  | 0.0 |
Purchases |  | 0.0 |
Sales |  | 0.0 |
Settlements |  | (5.5) |
Net transfer In (Out) of Level 3 (a) |  | 0.0 |
Balance at End of Period |  | $ 0.0 |
Funds withheld for reinsurance liability [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at Beginning of Period | 78.1 |  |
Total Gains (Losses) Included in Earnings | (1.3) |  |
Total Gains (Losses) Included in AOCI | 0.0 |  |
Purchases | 3.0 |  |
Sales | (6.3) |  |
Settlements | 0.0 |  |
Net transfer In (Out) of Level 3 (a) | (27.1) |  |
Balance at End of Period | $ 46.4 |  |

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