Investments (Policies)	12 Months Ended
Dec. 31, 2024
Investments [Abstract]
Investments	Accounting Policy. Debt securities, commercial mortgage loans, derivative financial instruments and short-term investments with contractual maturities during the next 12 months are classified on the balance sheet as current investments, unless they are held as statutory deposits or restricted for other purposes and then they are classified as Long-term investments. Equity securities may include funds that are used in our cash management strategy and are classified as current investments. All other investments are classified as Long-term investments. See Note 12 for information about the valuation of the Company's investment portfolio. Accounting Policy. Debt securities (including bonds, mortgage and other asset-backed securities, and preferred stocks redeemable by the investor) are classified as available for sale and are carried at fair value with changes in fair value recorded either in Accumulated other comprehensive loss within Shareholders' equity or in credit loss expense based on fluctuations in the allowance for credit losses, as further discussed below. When the Company intends to sell or determines that it is more likely than not to be required to sell an impaired debt security, the excess of amortized cost over fair value is directly written down with a charge to Net investment losses. Certain asset-backed securities are considered variable interest entities. See Note 13 for additional information. The Company reviews declines in fair value from a debt security's amortized cost basis to determine whether a credit loss exists and, when appropriate, recognizes a credit loss allowance with a corresponding charge to credit loss expense, presented in Net investment losses in the Company's Consolidated Statements of Income. The allowance for credit loss represents the excess of amortized cost over the greater of its fair value or the net present value of the debt security's projected future cash flows (based on qualitative and quantitative factors, including the probability of default and the estimated timing and amount of recovery). Each period, the allowance for credit loss is adjusted as needed through credit loss expense. The Company does not measure an allowance for credit losses for accrued interest receivables. When interest payments are delinquent based on contractual terms or when certain terms (interest rate or maturity date) of the investment have been restructured, accrued interest, reported in Other current assets, is written off through a charge to Net investment income and interest income is recognized on a cash basis. Review of Declines in Fair Value. Management reviews debt securities in an unrealized loss position to determine whether a credit loss allowance is needed based on criteria that include severity of decline; financial health and specific prospects of the issuer; and changes in the regulatory, economic or general market environment of the issuer's industry or geographic region. Accounting Policy. Equity securities with a readily determinable fair value consist primarily of public equity investments in the health care sector and mutual funds that invest in fixed income debt securities while those without a readily determinable fair value consist of private equity investments. Changes in the fair values of equity securities that have a readily determinable fair value are reported in Net investment losses. Equity securities without a readily determinable fair value are carried at cost minus impairment plus or minus changes resulting from observable price changes. Accounting Policy. Commercial mortgage loans are carried at unpaid principal balances, net of an allowance for expected credit losses, and classified as either current or long-term investments based on their contractual maturities. Changes in the allowance for expected credit losses are recognized as credit loss expense and presented in Net investment losses in the Company's Consolidated Statements of Income. Each period, the Company establishes (or adjusts) its allowance for expected credit losses for commercial mortgage loans. The allowance for expected credit losses is based on a credit risk category that is assigned to each loan at origination using key credit quality indicators, including debt service coverage and loan-to-value ratios. Credit risk categories are updated as key credit quality indicators change. An expected loss rate, assigned based on the credit risk category, is applied to each loan's unpaid principal balance to develop the aggregate allowance for expected credit losses. Commercial mortgage loans are considered impaired and written off against the allowance when it is probable that the Company will not collect all amounts due per the terms of the promissory note. In the event of a foreclosure, the allowance for credit losses is based on the excess of the carrying value of the mortgage loan over the fair value of its underlying collateral. Credit Quality. The Company regularly evaluates and monitors credit risk. Mortgage origination professionals employ an internal credit quality rating system designed to evaluate the relative risk of the transaction at origination that is then updated each year as part of the annual portfolio loan review. The Company evaluates and monitors credit quality on a consistent and ongoing basis. The annual portfolio review performed in the second quarter of 2024 confirmed ongoing strong overall credit quality in line with the previous year's results. Quality ratings are based on our evaluation of a number of key inputs related to the loan. The two most significant contributors to the credit quality rating are the debt service coverage and loan-to-value ratios. The debt service coverage ratio measures the amount of property cash flow available to meet annual interest and principal payments on debt, with a ratio below 1.0 indicating that there is not enough cash flow to cover the required loan payments. The loan-to-value ratio, commonly expressed as a percentage, compares the amount of the loan to the fair value of the underlying property collateralizing the loan. Accounting Policy. Policy loans, primarily associated with our corporate-owned life insurance business, are carried at unpaid principal balances plus accumulated interest, the total of which approximates fair value. These loans are collateralized by life insurance policy cash values and therefore have minimal exposure to credit loss. Interest rates are reset annually based on a rolling average of benchmark interest rates. Accounting Policy. Other long-term investments include investments in unconsolidated entities, including certain limited partnerships and limited liability companies holding real estate, securities or loans, and health care-related investments. These investments are carried at cost plus the Company's ownership percentage of reporting income or loss, based on the financial statements of the underlying investments that are generally reported at fair value. Income or loss from these investments is reported on a one-quarter lag due to the timing of when financial information is received from the general partner or manager of the investments. Other long-term investments also include investment real estate carried at depreciated cost less any impairment write-downs to fair value when cash flows indicate that the carrying value may not be recoverable. Depreciation is generally recorded using the straight-line method based on the estimated useful life of each asset. Investment real estate as of December 31, 2024 and 2023 is expected to be held longer than one year and may include real estate acquired through the foreclosure of commercial mortgage loans. Additionally, foreign currency swaps carried at fair value and certain restricted deposits are reported in the table below as "Other." See discussion below for information on the Company's accounting policies for derivative financial instruments. Other long-term investments and related commitments are diversified by issuer, property type and geographic regions. These investments are primarily unconsolidated variable interest entities (see Note 13 for additional information).Our limited partnership investments are reduced as the Company receives cash distributions for returns on its investment that were previously recognized in Net investment income. Accounting Policy. Security investments with maturities of greater than three months to one year from time of purchase are classified as short-term, available for sale and carried at fair value that approximates cost. Accounting Policy. When interest and principal payments on investments are current, the Company recognizes interest income when it is earned. The Company recognizes interest income on a cash basis when interest payments are delinquent based on contractual terms or when certain terms (interest rate or maturity date) of the investment have been restructured. For unconsolidated entities that are included in other long-term investments, investment income is generally recognized according to the Company's share of the reported income or loss on the underlying investments. Investment income attributed to the Company's separate accounts is excluded from our earnings because associated gains and losses generally accrue directly to separate account policyholders. Accounting Policy. Investment gains and losses are based on specifically identified assets and result from sales, investment asset write-downs, changes in the fair value of certain derivatives and equity securities and changes in allowances for credit losses on debt securities and commercial mortgage loan investments.
Derivative Financial Instruments	Accounting Policy. Derivatives are recorded in our Consolidated Balance Sheets at fair value and are classified as current or non-current according to their contractual maturities. Further information on our policies for determining fair value are discussed in Note 12. The Company applies hedge accounting when derivatives are designated, qualified and highly effective as hedges. Under hedge accounting, the changes in fair value of the derivative and the hedged risk are generally recognized together and offset each other when reported in Shareholders' net income. Various qualitative or quantitative methods appropriate for each hedge are used to formally assess and document hedge effectiveness at inception and each period throughout the life of a hedge. Fair Value Hedges of the Foreign Exchange-Related Changes in Fair Values of Certain Foreign-Denominated Bonds: This program hedges the foreign exchange-related changes in fair values of certain foreign-denominated bonds. The notional value of these derivatives matches the amortized cost of the hedged bonds. A majority of these instruments are denominated in Euros, with the remaining instruments denominated in British Pounds Sterling and Australian Dollars. Swap fair values are reported in Long-term investments or Other non-current liabilities. Offsetting changes in fair values attributable to the foreign exchange risk of the swap contracts and the hedged bonds are reported in Net investment losses. The portion of the swap contracts' changes in fair value excluded from the assessment of hedge effectiveness is recorded in Other comprehensive loss and recognized in Net investment income as swap coupon payments are accrued, offsetting the foreign-denominated coupons received on the designated bonds. Net cash flows are reported in Operating activities, while exchanges of notional principal amounts are reported in Investing activities. Fair Value Hedges of the Interest Rate Exposure on the Company's Long-Term Debt: This program converts a portion of the interest rate exposure on the Company's long-term debt from fixed to variable rates. This more closely aligns the Company's interest expense with the interest income received on its cash equivalent and short-term investment balances. The variable rates are benchmarked to SOFR. Using fair value hedge accounting, the fair values of the swap contracts are reported in other assets or other liabilities. The critical terms of these swaps match those of the long-term debt being hedged. As a result, the carrying value of the hedged debt is adjusted to reflect changes in its fair value driven by SOFR. The effects of those adjustments on interest expense are offset by the effects of corresponding changes in the swaps' fair value. The net impact from the hedge reported in Interest expense and other reflects interest expense on the hedged debt at the variable interest rate. Cash flows relating to these contracts are reported in Operating activities. Net Investment Hedges of Certain Foreign Subsidiaries Operating Principally in Currencies Other than the U.S. Dollar: This program reduces the risk of changes in net assets due to changes in foreign currency spot exchange rates for certain foreign subsidiaries that conduct their business principally in currencies other than the U.S. Dollar. The notional value of hedging instruments matches the hedged amount of subsidiary net assets. Foreign currency swap contracts are denominated in Euros. The fair values of the foreign currency swap and forward contracts are reported in other assets or other liabilities. The changes in fair values of these instruments are reported in Other comprehensive loss, specifically in translation of foreign currencies. The portion of the change in fair values relating to foreign exchange spot rates will be recognized in earnings upon deconsolidation of the hedged foreign subsidiaries. Cash flows relating to these contracts are reported in Investing activities.

Investments (Policies)

12 Months Ended

Dec. 31, 2024

Accounting Policy. Debt securities, commercial mortgage loans, derivative financial instruments and short-term investments with contractual maturities during the next 12 months are classified on the balance sheet as current investments, unless they are held as statutory deposits or restricted for other purposes and then they are classified as Long-term investments. Equity securities may include funds that are used in our cash management strategy and are classified as current investments. All other investments are classified as Long-term investments. See Note 12 for information about the valuation of the Company's investment portfolio.

Accounting Policy. Debt securities (including bonds, mortgage and other asset-backed securities, and preferred stocks redeemable by the investor) are classified as available for sale and are carried at fair value with changes in fair value recorded either in Accumulated other comprehensive loss within Shareholders' equity or in credit loss expense based on fluctuations in the allowance for credit losses, as further discussed below. When the Company intends to sell or determines that it is more likely than not to be required to sell an impaired debt security, the excess of amortized cost over fair value is directly written down with a charge to Net investment losses. Certain asset-backed securities are considered variable interest entities. See Note 13 for additional information.

The Company reviews declines in fair value from a debt security's amortized cost basis to determine whether a credit loss exists and, when appropriate, recognizes a credit loss allowance with a corresponding charge to credit loss expense, presented in Net investment losses in the Company's Consolidated Statements of Income. The allowance for credit loss represents the excess of amortized cost over the greater of its fair value or the net present value of the debt security's projected future cash flows (based on qualitative and quantitative factors, including the probability of default and the estimated timing and amount of recovery). Each period, the allowance for credit loss is adjusted as needed through credit loss expense.

The Company does not measure an allowance for credit losses for accrued interest receivables. When interest payments are delinquent based on contractual terms or when certain terms (interest rate or maturity date) of the investment have been restructured, accrued interest, reported in Other current assets, is written off through a charge to Net investment income and interest income is recognized on a cash basis.

Review of Declines in Fair Value. Management reviews debt securities in an unrealized loss position to determine whether a credit loss allowance is needed based on criteria that include severity of decline; financial health and specific prospects of the issuer; and changes in the regulatory, economic or general market environment of the issuer's industry or geographic region.

Accounting Policy. Equity securities with a readily determinable fair value consist primarily of public equity investments in the health care sector and mutual funds that invest in fixed income debt securities while those without a readily determinable fair value consist of private equity investments. Changes in the fair values of equity securities that have a readily determinable fair value are reported in Net investment losses. Equity securities without a readily determinable fair value are carried at cost minus impairment plus or minus changes resulting from observable price changes.

Accounting Policy. Commercial mortgage loans are carried at unpaid principal balances, net of an allowance for expected credit losses, and classified as either current or long-term investments based on their contractual maturities. Changes in the allowance for expected credit losses are recognized as credit loss expense and presented in Net investment losses in the Company's Consolidated Statements of Income.

Each period, the Company establishes (or adjusts) its allowance for expected credit losses for commercial mortgage loans. The allowance for expected credit losses is based on a credit risk category that is assigned to each loan at origination using key credit quality indicators, including debt service coverage and loan-to-value ratios. Credit risk categories are updated as key credit quality indicators change. An expected loss rate, assigned based on the credit risk category, is applied to each loan's unpaid principal balance to develop the aggregate allowance for expected credit losses. Commercial mortgage loans are considered impaired and written off against the allowance when it is probable that the Company will not collect all amounts due per the terms of the promissory note. In the event of a foreclosure, the allowance for credit losses is based on the excess of the carrying value of the mortgage loan over the fair value of its underlying collateral.

Credit Quality. The Company regularly evaluates and monitors credit risk. Mortgage origination professionals employ an internal credit quality rating system designed to evaluate the relative risk of the transaction at origination that is then updated each year as part of the annual portfolio loan review. The Company evaluates and monitors credit quality on a consistent and ongoing basis. The annual portfolio review performed in the second quarter of 2024 confirmed ongoing strong overall credit quality in line with the previous year's results.

Quality ratings are based on our evaluation of a number of key inputs related to the loan. The two most significant contributors to the credit quality rating are the debt service coverage and loan-to-value ratios. The debt service coverage ratio measures the amount of property cash flow available to meet annual interest and principal payments on debt, with a ratio below 1.0 indicating that there is not enough cash flow to cover the required loan payments. The loan-to-value ratio, commonly expressed as a percentage, compares the amount of the loan to the fair value of the underlying property collateralizing the loan.

Accounting Policy. Policy loans, primarily associated with our corporate-owned life insurance business, are carried at unpaid principal balances plus accumulated interest, the total of which approximates fair value. These loans are collateralized by life insurance policy cash values and therefore have minimal exposure to credit loss. Interest rates are reset annually based on a rolling average of benchmark interest rates.

Accounting Policy. Other long-term investments include investments in unconsolidated entities, including certain limited partnerships and limited liability companies holding real estate, securities or loans, and health care-related investments. These investments are carried at cost plus the Company's ownership percentage of reporting income or loss, based on the financial statements of the

underlying investments that are generally reported at fair value. Income or loss from these investments is reported on a one-quarter lag due to the timing of when financial information is received from the general partner or manager of the investments.

Other long-term investments also include investment real estate carried at depreciated cost less any impairment write-downs to fair value when cash flows indicate that the carrying value may not be recoverable. Depreciation is generally recorded using the straight-line method based on the estimated useful life of each asset. Investment real estate as of December 31, 2024 and 2023 is expected to be held longer than one year and may include real estate acquired through the foreclosure of commercial mortgage loans.

Additionally, foreign currency swaps carried at fair value and certain restricted deposits are reported in the table below as "Other." See discussion below for information on the Company's accounting policies for derivative financial instruments.

Other long-term investments and related commitments are diversified by issuer, property type and geographic regions. These investments are primarily unconsolidated variable interest entities (see Note 13 for additional information).Our limited partnership investments are reduced as the Company receives cash distributions for returns on its investment that were previously recognized in Net investment income.

Accounting Policy. Security investments with maturities of greater than three months to one year from time of purchase are classified as short-term, available for sale and carried at fair value that approximates cost.

Accounting Policy. When interest and principal payments on investments are current, the Company recognizes interest income when it is earned. The Company recognizes interest income on a cash basis when interest payments are delinquent based on contractual terms or when certain terms (interest rate or maturity date) of the investment have been restructured. For unconsolidated entities that are included in other long-term investments, investment income is generally recognized according to the Company's share of the reported income or loss on the underlying investments. Investment income attributed to the Company's separate accounts is excluded from our earnings because associated gains and losses generally accrue directly to separate account policyholders.

Accounting Policy. Investment gains and losses are based on specifically identified assets and result from sales, investment asset write-downs, changes in the fair value of certain derivatives and equity securities and changes in allowances for credit losses on debt securities and commercial mortgage loan investments.

Derivative Financial Instruments

Accounting Policy. Derivatives are recorded in our Consolidated Balance Sheets at fair value and are classified as current or non-current according to their contractual maturities. Further information on our policies for determining fair value are discussed in Note 12. The Company applies hedge accounting when derivatives are designated, qualified and highly effective as hedges. Under hedge accounting, the changes in fair value of the derivative and the hedged risk are generally recognized together and offset each other when reported in Shareholders' net income. Various qualitative or quantitative methods appropriate for each hedge are used to formally assess and document hedge effectiveness at inception and each period throughout the life of a hedge.

Fair Value Hedges of the Foreign Exchange-Related Changes in Fair Values of Certain Foreign-Denominated Bonds:

This program hedges the foreign exchange-related changes in fair values of certain foreign-denominated bonds. The notional value of these derivatives matches the amortized cost of the hedged bonds. A majority of these instruments are denominated in Euros, with the remaining instruments denominated in British Pounds Sterling and Australian Dollars. Swap fair values are reported in Long-term investments or Other non-current liabilities. Offsetting changes in fair values attributable to the foreign exchange risk of the swap contracts and the hedged bonds are reported in Net investment losses. The portion of the swap contracts' changes in fair value excluded from the assessment of hedge effectiveness is recorded in Other comprehensive loss and recognized in Net investment

income as swap coupon payments are accrued, offsetting the foreign-denominated coupons received on the designated bonds. Net cash flows are reported in Operating activities, while exchanges of notional principal amounts are reported in Investing activities.

Fair Value Hedges of the Interest Rate Exposure on the Company's Long-Term Debt:

This program converts a portion of the interest rate exposure on the Company's long-term debt from fixed to variable rates. This more closely aligns the Company's interest expense with the interest income received on its cash equivalent and short-term investment balances. The variable rates are benchmarked to SOFR. Using fair value hedge accounting, the fair values of the swap contracts are reported in other assets or other liabilities. The critical terms of these swaps match those of the long-term debt being hedged. As a result, the carrying value of the hedged debt is adjusted to reflect changes in its fair value driven by SOFR. The effects of those adjustments on interest expense are offset by the effects of corresponding changes in the swaps' fair value. The net impact from the hedge reported in Interest expense and other reflects interest expense on the hedged debt at the variable interest rate. Cash flows relating to these contracts are reported in Operating activities.

Net Investment Hedges of Certain Foreign Subsidiaries Operating Principally in Currencies Other than the U.S. Dollar:

This program reduces the risk of changes in net assets due to changes in foreign currency spot exchange rates for certain foreign subsidiaries that conduct their business principally in currencies other than the U.S. Dollar. The notional value of hedging instruments matches the hedged amount of subsidiary net assets. Foreign currency swap contracts are denominated in Euros. The fair values of the foreign currency swap and forward contracts are reported in other assets or other liabilities. The changes in fair values of these instruments are reported in Other comprehensive loss, specifically in translation of foreign currencies. The portion of the change in fair values relating to foreign exchange spot rates will be recognized in earnings upon deconsolidation of the hedged foreign subsidiaries. Cash flows relating to these contracts are reported in Investing activities.