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Investments - Available-for-Sale Securities (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Schedule of Investments [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 74.8 | $ 122.5 | $ 101.3 | $ 117.2
Total Gains (Losses) Included in Earnings | 0.8 | (0.1) |  |
Total investments, Carrying Value | 155.6 |  | 278.9 |
Total investments, Cost or Amortized Cost | 155.6 |  | 264.8 |
Investments, Unrealized Losses | 0.0 |  | 0.0 |
Investments, Unrealized Gains | 0.0 |  | 14.1 |
Total investment, Estimated Fair Value |  |  | 278.9 |
Total Gains (Losses) Included in AOCI |  | (0.5) |  |
Purchases | 5.1 | 10.0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 26.9 | 4.1 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 5.5 |  |  |
Corporate Debt Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 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 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 13.6 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0.0 |  |  |
Equity Securities [Member] | Held for trading [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | $ 14.1 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  |
Total investments, Carrying Value |  |  | $ 32.8 |
Available-for-sale Equity Securities, Amortized Cost Basis |  |  | 18.7 |
Fixed-maturity securities, available-for-sale [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0.0 |
Total investments, Carrying Value |  |  | 14.1 |
Funds Withheld Receivable |  |  | 14.1 |
Asset based loan receivables [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Trading Securities, Cost | 153.1 |  | 226.7 |
Trading Securities | 153.1 |  | 226.7 |
Other Invested Assets [Member] | Other Investments Asset [Member] | All Other Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Trading Securities, Cost | 2.5 |  | 5.3 |
Trading Securities | 2.5 |  | 5.3 |
Estimate of Fair Value Measurement [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investment, Estimated Fair Value | 155.6 |  |  |
Estimate of Fair Value Measurement [Member] | Equity Securities [Member] | Held for trading [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available-for-sale Securities, Equity Securities |  |  | 32.8 |
Estimate of Fair Value Measurement [Member] | Fixed-maturity securities, available-for-sale [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available-for-sale Securities, Debt Securities |  |  | 14.1 |
Estimate of Fair Value Measurement [Member] | Asset based loan receivables [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Trading Securities | 153.1 |  | 226.7 |
Estimate of Fair Value Measurement [Member] | Other Invested Assets [Member] | Other Investments Asset [Member] | All Other Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Trading Securities | $ 2.5 |  | $ 5.3 |

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