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Available For Sale Securities Fair Value

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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 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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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