Amount of earned premiums assumed from other entities.

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Amount of life insurance issued and outstanding assumed from other entities. Includes, but not limited to, dividends and adjustments to face value.

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Amount before contracts ceded to other entities and contracts assumed by the entity of life insurance issued and outstanding. Includes, but not limited to, dividends and adjustments to face value.

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Reinsurance (Schedule Of Reinsurance Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Premiums Net Life Insurance In Force [Abstract]
Gross amount - life insurance in force	$ 306,566.0us-gaap_LifeInsuranceInForceGross				$ 321,881.7us-gaap_LifeInsuranceInForceGross				$ 306,566.0us-gaap_LifeInsuranceInForceGross	$ 321,881.7us-gaap_LifeInsuranceInForceGross	$ 346,814.5us-gaap_LifeInsuranceInForceGross
Ceded premiums - life insurance in force	6,239.8us-gaap_LifeInsuranceInForceCeded				5,966.8us-gaap_LifeInsuranceInForceCeded				6,239.8us-gaap_LifeInsuranceInForceCeded	5,966.8us-gaap_LifeInsuranceInForceCeded	7,233.1us-gaap_LifeInsuranceInForceCeded
Assumed Premiums - life insurance in force	51.5us-gaap_LifeInsuranceInForceAssumed				57.7us-gaap_LifeInsuranceInForceAssumed				51.5us-gaap_LifeInsuranceInForceAssumed	57.7us-gaap_LifeInsuranceInForceAssumed	65.1us-gaap_LifeInsuranceInForceAssumed
Net amount - life insurance in force	300,377.7us-gaap_LifeInsuranceInForceNet				315,972.6us-gaap_LifeInsuranceInForceNet				300,377.7us-gaap_LifeInsuranceInForceNet	315,972.6us-gaap_LifeInsuranceInForceNet	339,646.5us-gaap_LifeInsuranceInForceNet
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount									2,086.1us-gaap_DirectPremiumsEarned	2,157.1us-gaap_DirectPremiumsEarned	2,201.2us-gaap_DirectPremiumsEarned
Ceded to Other Companies									126.5us-gaap_CededPremiumsEarned	129.5us-gaap_CededPremiumsEarned	134.7us-gaap_CededPremiumsEarned
Assumed From Other Companies									92.8us-gaap_AssumedPremiumsEarned	96.7us-gaap_AssumedPremiumsEarned	97.4us-gaap_AssumedPremiumsEarned
Net Amount	515.8us-gaap_PremiumsEarnedNet	507.3us-gaap_PremiumsEarnedNet	519.2us-gaap_PremiumsEarnedNet	510.1us-gaap_PremiumsEarnedNet	528.6us-gaap_PremiumsEarnedNet	524.4us-gaap_PremiumsEarnedNet	535.1us-gaap_PremiumsEarnedNet	536.2us-gaap_PremiumsEarnedNet	2,052.4us-gaap_PremiumsEarnedNet	2,124.3us-gaap_PremiumsEarnedNet	2,163.9us-gaap_PremiumsEarnedNet
Percentage of Amount Assumed to Net									4.50%us-gaap_PremiumsPercentageAssumedToNet	4.60%us-gaap_PremiumsPercentageAssumedToNet	4.50%us-gaap_PremiumsPercentageAssumedToNet
Life Insurance Segment [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount									854.6	898.5	937.9
Ceded to Other Companies									46.3	48.5	51.0
Assumed From Other Companies									0	0	0
Net Amount									808.3	850.0	886.9
Percentage of Amount Assumed to Net									0.00%	0.00%	0.00%
Accident And Health Insurance Segment [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount									1,231.5	1,258.6	1,263.3
Ceded to Other Companies									80.2	81.0	83.7
Assumed From Other Companies									92.8	96.7	97.4
Net Amount									$ 1,244.1	$ 1,274.3	$ 1,277.0
Percentage of Amount Assumed to Net									7.50%	7.60%	7.60%