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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items] |  |
Document Period End Date | Jun. 30, 2016 |
Total investments, Cost or Amortized Cost | $ 50.7 | $ 264.8
Investments, Unrealized Gains | 0.0 | 14.1
Investments, Unrealized Losses | 0.0 | 0.0
Available For Sale Securities Fair Value |  | 278.9
Total investments, Carrying Value | 50.7 | 278.9
Asset based loan receivables [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Cost | 48.2 | 226.7
Trading Securities | 48.2 | 226.7
Other Investments Gross Unrealized Gain | 0.0 | 0.0
Other Short Term Investments Gross Unrealized Losses | 0.0 | 0.0
Fixed Maturities Available For Sale [Member] | Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total fixed maturity available-for-sale securities, Amortized Cost |  | 14.1
Total investments, Carrying Value |  | 14.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0
Other Investments Asset [Member] | Other Invested Assets [Member] | All Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Cost | 2.5 | 5.3
Trading Securities | 2.5 | 5.3
Other Investments Gross Unrealized Gain | 0.0 | 0.0
Other Short Term Investments Gross Unrealized Losses | 0.0 | 0.0
Estimate of Fair Value Measurement [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available For Sale Securities Fair Value | 50.7 |
Estimate of Fair Value Measurement [Member] | Asset based loan receivables [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities | 48.2 | 226.7
Estimate of Fair Value Measurement [Member] | Fixed Maturities Available For Sale [Member] | Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities |  | 14.1
Estimate of Fair Value Measurement [Member] | Other Investments Asset [Member] | Other Invested Assets [Member] | All Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities | $ 2.5 | 5.3
Held for trading [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Carrying Value |  | 32.8
Available-for-sale Equity Securities, Amortized Cost Basis |  | 18.7
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
Held for trading [Member] | Estimate of Fair Value Measurement [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Equity Securities |  | $ 32.8

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