Fair Values of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share

The following tables present additional information about our private equity partnerships, including commitments for additional investments which may or may not be funded:

		December 31, 2024
Investment Category		Fair Value		Redemption Term / Redemption Notice	Unfunded Commitments
		(in millions of dollars)			(in millions of dollars)
Private Credit	(a)	$	236.9	Not redeemable	$	118.9
		52.3		Quarterly / 90 days notice	10.3
Total Private Credit		289.2			129.2
Private Equity	(b)	604.1		Not redeemable	398.2
		36.1		Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice	11.0
Total Private Equity		640.2			409.2
Real Assets	(c)	486.6		Not redeemable	230.1
		34.6		Quarterly / 90 days notice	—
Total Real Assets		521.2			230.1
Total Partnerships		$	1,450.6		$	768.5

		December 31, 2023
Investment Category		Fair Value		Redemption Term / Redemption Notice	Unfunded Commitments
		(in millions of dollars)			(in millions of dollars)
Private Credit	(a)	$	239.1	Not redeemable	$	128.2
		44.5		Quarterly / 90 days notice	8.6
Total Private Credit		283.6			136.8
Private Equity	(b)	543.9		Not redeemable	410.6
		28.0		Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice	16.6
Total Private Equity		571.9			427.2
Real Assets	(c)	437.5		Not redeemable	239.1
		33.2		Quarterly / 90 days notice	—
Total Real Assets		470.7			239.1
Total Partnerships		$	1,326.2		$	803.1

(a)Private Credit - The limited partnerships described in this category employ various investment strategies, generally providing direct lending or other forms of debt financing including first-lien, second-lien, mezzanine, and subordinated loans. The limited partnerships have credit exposure to corporates, physical assets, and/or financial assets within a variety of industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail) in North America and, to a lesser extent, outside of North America.  As of December 31, 2024, the estimated remaining life of the investments that do not allow for redemptions is approximately 78 percent in the next 3 years, 12 percent during the period from 3 to 5 years, and 10 percent during the period from 5 to 10 years.

(b)Private Equity - The limited partnerships described in this category employ various strategies generally investing in controlling or minority control equity positions directly in companies and/or assets across various industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail), primarily in private markets within North America and, to a lesser extent, outside of North America.  As of December 31, 2024, the estimated remaining life of the investments that do not allow for redemptions is approximately 36 percent in the next 3 years, 27 percent during the period from 3 to 5 years, 36 percent during the period from 5 to 10 years, and 1 percent during the period from 10 to 15 years.

(c)Real Assets - The limited partnerships described in this category employ various strategies, which include investing in the equity and/or debt financing of physical assets, including infrastructure (energy, power, water/wastewater, communications), transportation (including airports, ports, toll roads, aircraft, railcars) and real estate in North America, Europe, South America, and Asia.  As of December 31, 2024, the estimated remaining life of the investments that do not allow for redemptions is approximately 36 percent in the next 3 years, 26 percent during the period from 3 to 5 years, and 38 percent during the period from 5 to 10 years.

Fair Values by Fair Value Hierarchy Input Level

The following tables present information about financial instruments measured at fair value on a recurring basis by fair value level, based on the observability of the inputs used.

	December 31, 2024
	Level 1		Level 2		Level 3		NAV		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	77.9	$	452.6	$	—	$	—	$	530.5
States, Municipalities, and Political Subdivisions	—		3,291.4		—		—		3,291.4
Foreign Governments	—		768.1		—		—		768.1
Public Utilities	174.5		5,118.4		—		—		5,292.9
Mortgage/Asset-Backed Securities1	—		843.7		73.5		—		917.2
All Other Corporate Bonds	3,928.1		20,822.6		71.5		—		24,822.2
Redeemable Preferred Stocks	—		7.6		—		—		7.6
Total Fixed Maturity Securities	4,180.5		31,304.4		145.0		—		35,629.9
Other Long-term Investments
Derivatives
Forwards	—		6.5		—		—		6.5
Foreign Currency Interest Rate Swaps	—		72.9		—		—		72.9
Embedded Derivative in Modified Coinsurance Arrangement	—		—		11.5		—		11.5
Total Derivatives	—		79.4		11.5		—		90.9
Perpetual Preferred and Equity Securities	—		0.1		24.4		—		24.5
Private Equity Partnerships	—		—		—		1,450.6		1,450.6
Total Other Long-term Investments	—		79.5		35.9		1,450.6		1,566.0
Total Financial Instrument Assets Carried at Fair Value	$	4,180.5	$	31,383.9	$	180.9	$	1,450.6	$	37,195.9
Liabilities
Other Liabilities
Derivatives
Forwards	$	—	$	223.2	$	—	$	—	$	223.2
Foreign Currency Interest Rate Swaps	—		32.5		—		—		32.5
Total Derivatives	—		255.7		—		—		255.7
Total Financial Instrument Liabilities Carried at Fair Value	$	—	$	255.7	$	—	$	—	$	255.7

	December 31, 2023
	Level 1		Level 2		Level 3		NAV		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	—	$	624.8	$	—	$	—	$	624.8
States, Municipalities, and Political Subdivisions	—		3,678.4		—		—		3,678.4
Foreign Governments	—		890.7		—		—		890.7
Public Utilities	301.3		5,020.3		—		—		5,321.6
Mortgage/Asset-Backed Securities1	—		611.2		32.9		—		644.1
All Other Corporate Bonds	3,985.2		21,562.1		123.4		—		25,670.7
Redeemable Preferred Stocks	—		3.6		—		—		3.6
Total Fixed Maturity Securities	4,286.5		32,391.1		156.3		—		36,833.9
Other Long-term Investments
Derivatives
Forwards	—		47.5		—		—		47.5
Foreign Currency Interest Rate Swaps	—		52.4		—		—		52.4
Total Derivatives	—		99.9		—		—		99.9
Perpetual Preferred and Equity Securities	—		10.3		21.6		—		31.9
Private Equity Partnerships	—		—		—		1,326.2		1,326.2
Total Other Long-term Investments	—		110.2		21.6		1,326.2		1,458.0
Total Financial Instrument Assets Carried at Fair Value	$	4,286.5	$	32,501.3	$	177.9	$	1,326.2	$	38,291.9
Liabilities
Other Liabilities
Derivatives
Forwards	$	—	$	78.0	$	—	$	—	$	78.0
Foreign Currency Interest Rate Swaps	—		38.2		—		—		38.2
Embedded Derivative in Modified Coinsurance Arrangement	—		—		1.5		—		1.5
Total Derivatives	—		116.2		1.5		—		117.7
Total Financial Instrument Liabilities Carried at Fair Value	$	—	$	116.2	$	1.5	$	—	$	117.7

1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.

Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs

Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

	Year Ended December 31, 2024
	Fair Value Beginning of Year		Total Realized and Unrealized Investment Gains (Losses)  Included in				Purchases		Sales/Maturities		Level 3 Transfers				Fair Value End of Year		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI						Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
Public Utilities	$	—	$	(1.1)	$	1.3	$	—	$	(20.4)	$	20.2	$	—	$	—	$	—	$	—
Mortgage/Asset-Backed Securities1	32.9		—		0.6		38.5		(2.6)		4.1		—		73.5		0.6
All Other Corporate Bonds	123.4		(3.5)		8.9		3.2		(329.8)		318.1		(48.8)		71.5		8.9		—
Total Fixed Maturity Securities	156.3		(4.6)		10.8		41.7		(352.8)		342.4		(48.8)		145.0		9.5		—
Perpetual Preferred and Equity Securities	21.6		2.3		—		0.5		—		—		—		24.4		—		2.3
Embedded Derivative in Modified Coinsurance Arrangement	(1.5)		13.0		—		—		—		—		—		11.5		—		13.0

	Year Ended December 31, 2023
	Fair Value Beginning of Year		Total Realized and Unrealized Investment Gains (Losses)  Included in				Purchases		Sales/Maturities		Level 3 Transfers				Fair Value End of Year		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI						Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	0.2	$	—	$	—	$	—	$	—	$	—	$	(0.2)	$	—	$	—	$	—
Public Utilities	—		0.1		(0.1)		—		(50.5)		50.5		—		—		—		—
Mortgage/Asset-Backed Securities1	22.0		—		(0.2)		20.0		(0.5)		0.4		(8.8)		32.9		(0.2)		—
All Other Corporate Bonds	158.7		(5.0)		(15.8)		1.5		(334.1)		385.0		(66.9)		123.4		(15.8)		—
Total Fixed Maturity Securities	180.9		(4.9)		(16.1)		21.5		(385.1)		435.9		(75.9)		156.3		(16.0)		—
Perpetual Preferred and Equity Securities	16.2		0.6		—		4.8		—		—		—		21.6		—		0.6
Embedded Derivative in Modified Coinsurance Arrangement	(13.9)		12.4		—		—		—		—		—		(1.5)		—		12.4

1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.

Quantitative Information Regarding Significant Unobservable Inputs

The table below provides quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements derived from internal models. Unobservable inputs for fixed maturity securities are weighted by the fair value of the securities. Certain securities classified as Level 3 are excluded from the table below due to limitations in our ability to obtain the underlying inputs used by external pricing sources.

	December 31, 2024
	Fair Value		Valuation Method	Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private	$	16.3	Market Approach	Volatility of Credit Market Convention	(a) (b)	5.00% - 5.00% / 5.00% Priced at Par Value
Mortgage-Backed Securities/Asset-Backed Securities	21.2		Market Approach	Market Convention	(b)	Priced at Par Value
Perpetual Preferred and Equity Securities	24.4		Market Approach	Market Convention	(b)	Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement	11.5		Discounted Cash Flows	Projected Liability Cash Flows Weighted Spread of Swap Curve	(c)	Actuarial Assumptions (0.23)%

	December 31, 2023
	Fair Value		Valuation Method	Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private	$	15.9	Market Approach	Volatility of Credit Market Convention	(a) (b)	5.00% - 5.00% / 5.00% Priced at Par Value
Perpetual Preferred and Equity Securities	21.6		Market Approach	Market Convention	(b)	Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement	(1.5)		Discounted Cash Flows	Projected Liability Cash Flows Weighted Spread of Swap Curve	(c)	Actuarial Assumptions 0.2%

(a)Represents basis point adjustments for credit-specific factors

(b)Represents a decision to price based on par value, cost, owner's equity, or the price of the most recent capital funding round when limited data is available

(c)Represents various actuarial assumptions required to derive the liability cash flows. Fair value of embedded derivative is most often driven by the change in the weighted average credit spread to the swap curve for the assets backing the hypothetical loan

Carrying Amount and Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of our financial instruments not measured at fair value and indicates the level in the fair value hierarchy of the estimated fair value measurement based on the observability of the inputs used:

	December 31, 2024
	Estimated Fair Value
	Level 1		Level 2		Level 3		Total		Carrying Value
	(in millions of dollars)
Assets
Mortgage Loans	$	—	$	1,975.4	$	—	$	1,975.4	$	2,224.5
Policy Loans	—		—		3,672.9		3,672.9		3,617.2
Other Long-term Investments
Miscellaneous Long-term Investments	—		26.7		0.2		26.9		26.9
Total Financial Instrument Assets Not Carried at Fair Value	$	—	$	2,002.1	$	3,673.1	$	5,675.2	$	5,868.6
Liabilities
Long-term Debt	$	3,246.1	$	43.2	$	—	$	3,289.3	$	3,465.2
Other Liabilities
Unfunded Commitments	—		0.2		—		0.2		0.2
Payable for Collateral on FHLB Funding Agreements	—		324.2		—		324.2		324.2
Total Financial Instrument Liabilities Not Carried at Fair Value	$	3,246.1	$	367.6	$	—	$	3,613.7	$	3,789.6

	December 31, 2023
	Estimated Fair Value
	Level 1		Level 2		Level 3		Total		Carrying Value
	(in millions of dollars)
Assets
Mortgage Loans	$	—	$	2,070.7	$	—	$	2,070.7	$	2,318.2
Policy Loans	—		—		3,696.3		3,696.3		3,620.2
Other Long-term Investments
Miscellaneous Long-term Investments	—		15.7		0.3		16.0		16.0
Total Financial Instrument Assets Not Carried at Fair Value	$	—	$	2,086.4	$	3,696.6	$	5,783.0	$	5,954.4
Liabilities
Long-term Debt	$	2,629.1	$	598.8	$	—	$	3,227.9	$	3,430.4
Other Liabilities
Unfunded Commitments	—		0.2		—		0.2		0.2
Payable for Collateral on FHLB Funding Agreements	—		64.5		—		64.5		64.5
Total Financial Instrument Liabilities Not Carried at Fair Value	$	2,629.1	$	663.5	$	—	$	3,292.6	$	3,495.1

The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, securities lending agreements, and short-term debt approximate fair value due to the short-term nature of the instruments. As such, these financial instruments are not included in the above chart.