Funds Withheld Receivables Investments Underlying Funds Withheld Receivables by Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 12.8
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	11.9
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	231.4
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	228.2
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	420.8
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	429.3
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	487.1
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	493.3
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	1,152.1
Available For Sale Securities Debt Maturities Fair Value Excluding Single Maturity Date	1,162.7
Mortgage Backed Securities, Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	357.5
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	350.4
Structured hybrids
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	22.2
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	22.0
Fixed Maturities Available For Sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,531.8	$ 1,721.3
Available-for-sale Securities, Debt Securities	$ 1,535.1	$ 1,638.1

Available for sale securities debt maturities amortized cost excluding single maturity date.

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Available for sale securities debt maturities fair value excluding single maturity date.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous 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 after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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

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