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Investments - Available-for-Sale Securities (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2016 | Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 74.7 | $ 85.8 | $ 74.7 | $ 85.8 | $ 73.9 | $ 101.3 | $ 137.8 | $ 117.2
Total Gains (Losses) Included in Earnings | (0.3) | 2.3 | 0.2 | 7.9 |  |  |  |
Total investments, Carrying Value | 50.7 |  | 50.7 |  |  | 278.9 |  |
Total investments, Cost or Amortized Cost | 50.7 |  | 50.7 |  |  | 264.8 |  |
Investments, Unrealized Losses | 0.0 |  | 0.0 |  |  | 0.0 |  |
Investments, Unrealized Gains | 0.0 |  | 0.0 |  |  | 14.1 |  |
Available For Sale Securities Fair Value |  |  |  |  |  | 278.9 |  |
Total Gains (Losses) Included in AOCI |  |  |  | (0.5) |  |  |  |
Purchases | 4.4 | 1.9 | 12.5 | 23.9 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 2.8 | 6.2 | 32.8 | 12.7 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0.5 | 50.0 | 6.5 | 50.0 |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | $ 15.8 |  | 15.8 |  | 14.1 | $ 15.8 | $ 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 |  |  |  |  |  | 0.0 |  |
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 | 48.2 |  | 48.2 |  |  | 226.7 |  |
Trading Securities | 48.2 |  | 48.2 |  |  | 226.7 |  |
Other Invested Assets [Member] | Other Investments Asset [Member] | All Other Securities [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Trading Securities, Cost | 2.5 |  | 2.5 |  |  | 5.3 |  |
Trading Securities | 2.5 |  | 2.5 |  |  | 5.3 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Available For Sale Securities Fair Value | 50.7 |  | 50.7 |  |  |  |  |
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 | 48.2 |  | 48.2 |  |  | 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 |  | $ 2.5 |  |  | $ 5.3 |  |

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