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Available For Sale Securities Fair Value

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Investments, Unrealized Gains

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Unrealized amortized cost on securities.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Cost of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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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