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Reinsurance - Effect of Reinsurance on Premiums Earned, Benefits Incurred and Reserve Changes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Effects of Reinsurance [Line Items]
Direct Premiums Earned	$ 64.1us-gaap_DirectPremiumsEarned	$ 67.0us-gaap_DirectPremiumsEarned	$ 127.3us-gaap_DirectPremiumsEarned	$ 134.7us-gaap_DirectPremiumsEarned
Policyholder Benefits and Claims Incurred, Direct	249.9us-gaap_PolicyholderBenefitsAndClaimsIncurredGross	256.4us-gaap_PolicyholderBenefitsAndClaimsIncurredGross	554.1us-gaap_PolicyholderBenefitsAndClaimsIncurredGross	552.8us-gaap_PolicyholderBenefitsAndClaimsIncurredGross
Assumed Premiums Earned	8.6us-gaap_AssumedPremiumsEarned	9.5us-gaap_AssumedPremiumsEarned	17.4us-gaap_AssumedPremiumsEarned	18.8us-gaap_AssumedPremiumsEarned
Policyholder Benefits and Claims Incurred, Assumed	19.1us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	9.9us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	29.1us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	15.3us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed
Ceded Premiums Earned	58.2us-gaap_CededPremiumsEarned	61.7us-gaap_CededPremiumsEarned	118.5us-gaap_CededPremiumsEarned	124.8us-gaap_CededPremiumsEarned
Policyholder Benefits and Claims Incurred, Ceded	73.8us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	69.8us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	146.5us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	136.9us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
Premiums Earned, Net, Life	14.5us-gaap_PremiumsEarnedNetLife	14.8us-gaap_PremiumsEarnedNetLife	26.2us-gaap_PremiumsEarnedNetLife	28.7us-gaap_PremiumsEarnedNetLife
Benefits and other changes in policy reserves	$ 195.2us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 196.5us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 436.7us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 431.2us-gaap_PolicyholderBenefitsAndClaimsIncurredNet

X

- Definition

Amount of earned premiums assumed from other entities.

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Amount of earned premiums ceded to other entities.

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Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred.

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