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Income From Investments - Net Impairment Losses Recognized in Earnings (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
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Impairment Losses Recognized in Earnings | $ (6.5)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (3.8)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (4.1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (0.8)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (7.6)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (3.4)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (1.0)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (1.9)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (15.2)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (13.9)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ (6.9)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | (5.7)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / invest_InvestmentAxis = us-gaap_FixedMaturitiesMember | (10.3)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / invest_InvestmentAxis = us-gaap_FixedMaturitiesMember | (1.9)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / invest_InvestmentAxis = us-gaap_FixedMaturitiesMember
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | (7.1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / invest_InvestmentAxis = us-gaap_EquitySecuritiesMember | (3.6)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / invest_InvestmentAxis = us-gaap_EquitySecuritiesMember | (1.9)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / invest_InvestmentAxis = us-gaap_EquitySecuritiesMember
Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | $ (2.4)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / invest_InvestmentAxis = us-gaap_RealEstateInvestmentMember | $ 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / invest_InvestmentAxis = us-gaap_RealEstateInvestmentMember | $ (3.1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / invest_InvestmentAxis = us-gaap_RealEstateInvestmentMember

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 + Details
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