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Schedule 4 - Reinsurance Schedule (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Premiums, Life Insurance in Force | $ 20,565.9 us-gaap_LifeInsuranceInForceGross |  |  |  | $ 21,006.0 us-gaap_LifeInsuranceInForceGross |  |  |  | $ 20,565.9 us-gaap_LifeInsuranceInForceGross | $ 21,006.0 us-gaap_LifeInsuranceInForceGross | $ 21,340.4 us-gaap_LifeInsuranceInForceGross
Direct Premiums Earned |  |  |  |  |  |  |  |  | 1,831.1 us-gaap_DirectPremiumsEarned | 2,007.0 us-gaap_DirectPremiumsEarned | 2,105.6 us-gaap_DirectPremiumsEarned
Ceded Premiums, Life Insurance in Force | 541.5 us-gaap_LifeInsuranceInForceCeded |  |  |  | 576.4 us-gaap_LifeInsuranceInForceCeded |  |  |  | 541.5 us-gaap_LifeInsuranceInForceCeded | 576.4 us-gaap_LifeInsuranceInForceCeded | 610.4 us-gaap_LifeInsuranceInForceCeded
Ceded to Other Companies |  |  |  |  |  |  |  |  | 26.0 us-gaap_CededPremiumsEarned | 33.9 us-gaap_CededPremiumsEarned | 42.5 us-gaap_CededPremiumsEarned
Assumed Premiums, Life Insurance in Force | 217.8 us-gaap_LifeInsuranceInForceAssumed |  |  |  | 229.5 us-gaap_LifeInsuranceInForceAssumed |  |  |  | 217.8 us-gaap_LifeInsuranceInForceAssumed | 229.5 us-gaap_LifeInsuranceInForceAssumed | 242.9 us-gaap_LifeInsuranceInForceAssumed
Assumed Premiums Earned |  |  |  |  |  |  |  |  | 57.1 us-gaap_AssumedPremiumsEarned | 52.7 us-gaap_AssumedPremiumsEarned | 44.0 us-gaap_AssumedPremiumsEarned
Premiums, Net, Life Insurance in Force | 20,242.2 us-gaap_LifeInsuranceInForceNet |  |  |  | 20,659.1 us-gaap_LifeInsuranceInForceNet |  |  |  | 20,242.2 us-gaap_LifeInsuranceInForceNet | 20,659.1 us-gaap_LifeInsuranceInForceNet | 20,972.9 us-gaap_LifeInsuranceInForceNet
Net Amount | 451.5 us-gaap_PremiumsEarnedNet | 462.8 us-gaap_PremiumsEarnedNet | 470.3 us-gaap_PremiumsEarnedNet | 477.6 us-gaap_PremiumsEarnedNet | 495.6 us-gaap_PremiumsEarnedNet | 507.5 us-gaap_PremiumsEarnedNet | 512.8 us-gaap_PremiumsEarnedNet | 509.9 us-gaap_PremiumsEarnedNet | 1,862.2 us-gaap_PremiumsEarnedNet | 2,025.8 us-gaap_PremiumsEarnedNet | 2,107.1 us-gaap_PremiumsEarnedNet
Life Insurance in Force Premiums, Percentage Assumed to Net | 1.10%us-gaap_LifeInsuranceInForcePercentageAssumedToNet |  |  |  | 1.10%us-gaap_LifeInsuranceInForcePercentageAssumedToNet |  |  |  | 1.10%us-gaap_LifeInsuranceInForcePercentageAssumedToNet | 1.10%us-gaap_LifeInsuranceInForcePercentageAssumedToNet | 1.20%us-gaap_LifeInsuranceInForcePercentageAssumedToNet
Premiums, Percentage Assumed to Net |  |  |  |  |  |  |  |  | 3.10%us-gaap_PremiumsPercentageAssumedToNet | 2.60%us-gaap_PremiumsPercentageAssumedToNet | 2.10%us-gaap_PremiumsPercentageAssumedToNet
Life Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Premiums Earned |  |  |  |  |  |  |  |  | 387.5 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 392.4 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 392.8 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember
Ceded to Other Companies |  |  |  |  |  |  |  |  | 1.5 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 1.5 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 1.4 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember
Assumed Premiums Earned |  |  |  |  |  |  |  |  | 1.6 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 1.8 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 2.0 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember
Net Amount |  |  |  |  |  |  |  |  | 387.6 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 392.7 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 393.4 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember
Premiums, Percentage Assumed to Net |  |  |  |  |  |  |  |  | 0.40%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 0.50%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember | 0.50%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember
Accident and Health Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Premiums Earned |  |  |  |  |  |  |  |  | 146.3 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 161.9 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 165.5 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember
Ceded to Other Companies |  |  |  |  |  |  |  |  | 0.5 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 0.6 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 0.4 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember
Assumed Premiums Earned |  |  |  |  |  |  |  |  | 2.8 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 0.1 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 0.1 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember
Net Amount |  |  |  |  |  |  |  |  | 148.6 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 161.4 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 165.2 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember
Premiums, Percentage Assumed to Net |  |  |  |  |  |  |  |  | 1.90%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 0.10%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember | 0.10%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_AccidentAndHealthInsuranceSegmentMember
Property, Liability and Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Premiums Earned |  |  |  |  |  |  |  |  | 1,297.3 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | 1,452.7 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | 1,547.3 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Ceded to Other Companies |  |  |  |  |  |  |  |  | 24.0 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | 31.8 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | 40.7 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Assumed Premiums Earned |  |  |  |  |  |  |  |  | 52.7 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | 50.8 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | 41.9 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Net Amount |  |  |  |  |  |  |  |  | $ 1,326.0 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | $ 1,471.7 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | $ 1,548.5 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Premiums, Percentage Assumed to Net |  |  |  |  |  |  |  |  | 4.00%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | 3.50%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | 2.70%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember

X
- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 + Details
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- Definition Amount of life insurance issued and outstanding assumed from other entities. Includes, but not limited to, dividends and adjustments to face value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition Amount of life insurance issued and outstanding ceded to other entities. Includes, but not limited to, dividends and adjustments to face value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition Amount after 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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