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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | $ 73.9 | $ 137.8 | $ 101.3 | $ 117.2
Total Gains (Losses) Included in Earnings | (0.3) | 2.3 | 0.2 | 7.9
Total Gains (Losses) Included in AOCI |  |  |  | (0.5)
Purchases | 4.4 | 1.9 | 12.5 | 23.9
Sales | (2.8) | (6.2) | (32.8) | (12.7)
Settlements | (0.5) | (50.0) | (6.5) | (50.0)
Balance at End of Period | 74.7 | 85.8 | 74.7 | 85.8
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 | 654.0 | 584.5 | 629.2 | 151.3
Total Gains (Losses) Included in Earnings | 14.1 | (23.4) | 34.3 | (0.8)
Purchases |  | 47.7 |  | 468.2
Settlements | 59.2 | (14.2) | 54.6 | (24.1)
Balance at End of Period | 608.9 | 594.6 | 608.9 | 594.6
Fixed Index Annuity [Member] |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 136.5 | 155.9 | 142.3 | 150.8
Total Gains (Losses) Included in Earnings | (3.0) | (6.9) | (8.8) | (1.8)
Balance at End of Period | 133.5 | 149.0 | 133.5 | 149.0
Equity conversion feature of preferred stock [Member] |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 790.5 | 740.4 | 771.5 | 302.1
Total Gains (Losses) Included in Earnings | 11.1 | (30.3) | 25.5 | (2.6)
Total Gains (Losses) Included in AOCI | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 47.7 | 0.0 | 468.2
Sales | 0.0 | 0.0 | 0.0 | 0.0
Settlements | 59.2 | (14.2) | 54.6 | (24.1)
Net transfer In (Out) of Level 3 | 0.0 | 0.0 | 0.0 | 0.0
Balance at End of Period | 742.4 | 743.6 | 742.4 | 743.6
Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 15.8 | 14.1 | 16.3
Total Gains (Losses) Included in Earnings |  |  | (0.5) |
Total Gains (Losses) Included in AOCI |  |  |  | (0.5)
Purchases |  |  | 0.0 |
Sales |  |  | (13.6) |
Settlements |  |  | 0.0 |
Balance at End of Period |  | 15.8 |  | 15.8
Funds Withheld Receivables [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 75.0 |  | 59.4
Total Gains (Losses) Included in Earnings |  | (0.7) |  | (0.6)
Purchases |  | 1.9 |  | 23.9
Sales |  | (6.2) |  | (12.7)
Balance at End of Period |  | 70.0 |  | 70.0
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 | 73.9 |  | 84.4 |
Total Gains (Losses) Included in Earnings | (0.3) |  | (2.0) |
Total Gains (Losses) Included in AOCI | 0.0 |  | 0.0 |
Purchases | 4.4 |  | 12.5 |
Sales | (2.8) |  | (19.2) |
Settlements | (0.5) |  | (1.0) |
Net transfer In (Out) of Level 3 (a) | 0.0 |  | 0.0 |
Balance at End of Period | $ 74.7 |  | $ 74.7 |
Contingent Purchase Price Reduction Receivable [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 47.0 |  | 41.5
Total Gains (Losses) Included in Earnings |  | 3.0 |  | 8.5
Settlements |  | $ (50.0) |  | $ (50.0)

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