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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | $ 46.4 |  | $ 65.1 | $ 78.1 |  | $ 91.6
Total Gains (Losses) Included in Earnings |  |  | (0.3) | (1.3) |  | 0.3
Purchases | 6.1 |  | 3.1 | 9.1 |  | 8.1
Sales | (1.0) |  | (3.4) | (7.3) |  | (30.0)
Settlements |  |  |  |  |  | (5.5)
Net transfer In (Out) of Level 3 (a) | (2.4) | [1] |  | (29.5) | [2] |
Balance at End of Period | 49.1 |  | 64.5 | 49.1 |  | 64.5
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 755.7 |  | 768.9 | 763.0 |  | 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
Purchases | 0.0 |  | 0.0 | 0.0 |  | 0.0
Sales | 0.0 |  | 0.0 | 0.0 |  | 0.0
Settlements | (5.6) |  | (1.1) | (20.9) |  | 4.6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | 0.0 | [1] | 0.0 | 0.0 | [2] | 0.0
Balance at End of Period | 782.2 |  | 790.5 | 782.2 |  | 790.5
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 | 634.5 |  | 629.0 | 631.8 |  | 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
Settlements | (5.6) |  | (1.1) | (20.9) |  | 4.6
Balance at End of Period | 661.2 |  | 654.0 | 661.2 |  | 654.0
Fixed Index Annuity [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 121.2 |  | 139.9 | 131.2 |  | 142.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings | (0.2) |  | (3.4) | (10.2) |  | (5.8)
Balance at End of Period | 121.0 |  | 136.5 | 121.0 |  | 136.5
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 |  |  |  |  |  | (1.9)
Purchases |  |  |  |  |  | 8.1
Sales |  |  |  |  |  | (16.4)
Balance at End of Period |  |  | 64.5 |  |  | 64.5
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 |  |  | 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 | 46.4 |  | 65.1 | 78.1 |  |
Total Gains (Losses) Included in Earnings | 0.0 |  | (0.3) | (1.3) |  |
Total Gains (Losses) Included in AOCI | 0.0 |  | 0.0 | 0.0 |  |
Purchases | 6.1 |  | 3.1 | 9.1 |  |
Sales | (1.0) |  | (3.4) | (7.3) |  |
Settlements | 0.0 |  | 0.0 | 0.0 |  |
Net transfer In (Out) of Level 3 (a) | (2.4) | [1] | 0.0 | (29.5) | [2] |
Balance at End of Period | $ 49.1 |  | $ 64.5 | $ 49.1 |  | $ 64.5
[1] | (a) During the three months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.
[2] | (a) During the six months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.

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