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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Flows from Operating Activities |  |  |
Net Income | $ 413.4 us-gaap_NetIncomeLoss | $ 858.1 us-gaap_NetIncomeLoss | $ 894.4 us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities |  |  |
Change in Receivables | (21.5)us-gaap_IncreaseDecreaseInReceivables | (196.7)us-gaap_IncreaseDecreaseInReceivables | 40.4 us-gaap_IncreaseDecreaseInReceivables
Change in Deferred Acquisition Costs | (83.2)us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease | (47.9)us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease | (88.6)us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease
Change in Insurance Reserves and Liabilities | 972.2 us-gaap_IncreaseDecreaseInInsuranceLiabilities | 572.5 us-gaap_IncreaseDecreaseInInsuranceLiabilities | 508.4 us-gaap_IncreaseDecreaseInInsuranceLiabilities
Change in Income Taxes | (44.7)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (49.4)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 168.0 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Change in Other Accrued Liabilities | 105.2 us-gaap_IncreaseDecreaseInOtherAccruedLiabilities | 21.2 us-gaap_IncreaseDecreaseInOtherAccruedLiabilities | 18.6 us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Non-cash Components of Net Investment Income | (180.9)us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable | (211.5)us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable | (221.3)us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable
Net Realized Investment Gain | (16.1)us-gaap_GainLossOnInvestments | (6.8)us-gaap_GainLossOnInvestments | (56.2)us-gaap_GainLossOnInvestments
Depreciation | 87.9 us-gaap_DepreciationAmortizationAndAccretionNet | 84.8 us-gaap_DepreciationAmortizationAndAccretionNet | 84.3 us-gaap_DepreciationAmortizationAndAccretionNet
Other, Net | (8.7)us-gaap_OtherNoncashIncomeExpense | 7.2 us-gaap_OtherNoncashIncomeExpense | 31.6 us-gaap_OtherNoncashIncomeExpense
Net Cash Provided by Operating Activities | 1,223.6 us-gaap_NetCashProvidedByUsedInOperatingActivities | 1,031.5 us-gaap_NetCashProvidedByUsedInOperatingActivities | 1,379.6 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities |  |  |
Proceeds from Sales of Fixed Maturity Securities | 450.1 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 1,040.5 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 595.9 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from Maturities of Fixed Maturity Securities | 1,819.4 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 2,146.4 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 2,160.5 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Proceeds from Sales and Maturities of Other Investments | 235.0 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments | 243.4 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments | 182.2 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments
Purchase of Fixed Maturity Securities | (2,918.4)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (3,553.6)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (3,512.8)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Purchase of Other Investments | (285.2)us-gaap_PaymentsToAcquireOtherInvestments | (363.7)us-gaap_PaymentsToAcquireOtherInvestments | (353.8)us-gaap_PaymentsToAcquireOtherInvestments
Net Sales (Purchases) of Short-term Investments | (69.3)us-gaap_PaymentsForProceedsFromShortTermInvestments | 551.3 us-gaap_PaymentsForProceedsFromShortTermInvestments | (34.5)us-gaap_PaymentsForProceedsFromShortTermInvestments
Net Increase (Decrease) in Payables for Collateral on Investments | (3.8)us-gaap_IncreaseDecreaseInCashCollateralForLoanedSecurities | (378.2)us-gaap_IncreaseDecreaseInCashCollateralForLoanedSecurities | 97.9 us-gaap_IncreaseDecreaseInCashCollateralForLoanedSecurities
Net Purchases of Property and Equipment | (114.5)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (105.5)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (105.4)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Other, Net | 0.1 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 0.2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 0.1 us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net Cash Used by Investing Activities | (886.6)us-gaap_NetCashProvidedByUsedInInvestingActivities | (419.2)us-gaap_NetCashProvidedByUsedInInvestingActivities | (969.9)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities |  |  |
Issuance of Long-term Debt | 347.2 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 246.4 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Long-term Debt Repayments | (186.6)us-gaap_RepaymentsOfLongTermDebt | (116.2)us-gaap_RepaymentsOfLongTermDebt | (70.0)us-gaap_RepaymentsOfLongTermDebt
Cost Related to Early Retirement of Debt | (13.2)us-gaap_PaymentsOfDebtExtinguishmentCosts | 0 us-gaap_PaymentsOfDebtExtinguishmentCosts | 0 us-gaap_PaymentsOfDebtExtinguishmentCosts
Issuance of Common Stock | 12.3 us-gaap_ProceedsFromIssuanceOfCommonStock | 11.4 us-gaap_ProceedsFromIssuanceOfCommonStock | 4.9 us-gaap_ProceedsFromIssuanceOfCommonStock
Repurchase of Common Stock | (306.0)us-gaap_PaymentsForRepurchaseOfCommonStock | (317.2)us-gaap_PaymentsForRepurchaseOfCommonStock | (496.7)us-gaap_PaymentsForRepurchaseOfCommonStock
Dividends Paid to Stockholders | (159.4)us-gaap_PaymentsOfDividends | (146.5)us-gaap_PaymentsOfDividends | (133.8)us-gaap_PaymentsOfDividends
Other, Net | (22.9)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (27.0)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | 0.2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net Cash Used by Financing Activities | (328.6)us-gaap_NetCashProvidedByUsedInFinancingActivities | (595.5)us-gaap_NetCashProvidedByUsedInFinancingActivities | (449.0)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net Increase (Decrease) in Cash and Bank Deposits | 8.4 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 16.8 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (39.3)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Bank Deposits at Beginning of Year | 94.1 us-gaap_Cash | 77.3 us-gaap_Cash | 116.6 us-gaap_Cash
Cash and Bank Deposits at End of Year | $ 102.5 us-gaap_Cash | $ 94.1 us-gaap_Cash | $ 77.3 us-gaap_Cash

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- Definition The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal. + References No definition available. + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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