Employers (EIG) 10-K 28 Feb 25 2024 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2024	Feb. 24, 2025	Jun. 30, 2024
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Financial Statement Error Correction [Flag]	false
Document Period End Date	Dec. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Entity Registrant Name	EMPLOYERS HOLDINGS, INC.
Entity Central Index Key	0001379041
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 756,037,167
Entity Common Stock Shares Outstanding (in shares)		24,357,217
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	EIG
Security Exchange Name	NYSE
Entity File Number	001-33245
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	04-3850065
Entity Address, Address Line One	5340 Kietzke Lane, Suite 202
Entity Address, City or Town	Reno,
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89511
City Area Code	888
Local Phone Number	682-6671
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	Portions of the registrant's Definitive Proxy Statement relating to the 2025 Annual Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K.

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Auditor [Line Items]
Auditor Location	San Francisco, California
Auditor Name	Ernst & Young LLP
Auditor Firm ID	42

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Investments:
Fixed maturity securities at fair value (amortized cost $2,203.1 at December 31, 2024 and $2,048.0 at December 31, 2023, less CECL allowance of $1.1 at December 31, 2024 and $2.7 at December 31, 2023)	$ 2,097.4	$ 1,936.3
Equity securities at fair value (cost $145.0 at December 31, 2024 and $125.9 at December 31, 2023)	254.1	211.2
Equity securities at cost	5.7	6
Other invested assets (cost $90.9 at December 31, 2024 and $82.5 at December 31, 2023)	106.6	91.5
Short-term investments at fair value (amortized cost $0.1 at December 31, 2024 and $33.1 at December 31, 2023)	0.1	33.1
Total investments	2,463.9	2,278.1
Cash and cash equivalents	68.3	226.4
Restricted cash and cash equivalents	0.2	0.2
Accrued investment income	15.7	16.3
Premiums receivable (less CECL allowance of $19.2 at December 31, 2024 and $17.9 at December 31, 2023)	361.3	359.4
Reinsurance recoverable for:
Paid losses	6.3	6.3
Unpaid losses (less CECL allowance of $0.9 at December 31, 2024 and $0.9 at December 31, 2023)	411.5	427.5
Deferred policy acquisition costs	59.6	55.6
Deferred Income Tax Assets, Net	38.3	43.4
Property and equipment, net	7.8	6.5
Operating lease right-of-use assets	3.7	5.1
Intangible assets, net	13.6	13.6
Goodwill	36.2	36.2
Contingent commission receivable–LPT Agreement	0	14.2
Cloud computing arrangements	17.3	28
Other assets	37.6	33.6
Total assets	3,541.3	3,550.4
Liabilities and stockholders' equity
Unpaid losses and loss adjustment expenses	1,808.2	1,884.5
Unearned premiums	402.2	379.7
Commissions and premium taxes payable	65.8	66
Accounts payable and accrued expenses	21.2	26.1
Deferred reinsurance gain—LPT Agreement	94	99.2
Contractual Obligation	13.8	17
Operating lease liability	4.2	5.9
Other liabilities	63.2	58.1
Total liabilities	2,472.6	2,536.5
Commitments and contingencies (Note $12)
Stockholders' equity:
Common stock, $0.01 par value; 150,000,000 shares authorized; 58,184,861 and 58,055,968 shares issued and 24,556,706 and 25,369,753 shares outstanding at December 31, 2024 and 2023, respectively	0.6	0.6
Preferred stock, $0.01 par value; 25,000,000 shares authorized; none issued	0	0
Additional paid-in capital	424.2	419.8
Retained earnings	1,472.9	1,384.3
Accumulated other comprehensive loss, net of tax	(82.5)	(86)
Treasury stock, at cost (33,628,155 shares at December 31, 2024 and 32,686,215 shares at December 31, 2023)	(746.5)	(704.8)
Total stockholders' equity	1,068.7	1,013.9
Total liabilities and stockholders' equity	$ 3,541.3	$ 3,550.4

Consolidated Balance Sheets Par

Consolidated Balance Sheets Parentheticals - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Parentheticals [Abstract]
Fixed maturity securities, amortized cost	$ 2,203.1	$ 2,048
Debt Securities, Available-for-sale, Allowance for Credit Loss	1.1	2.7
Equity securities, cost	145	125.9
Other Investments, at Cost	90.9	82.5
Short-term investments, amortized cost	0.1	33.1
Beginning balance of the allowance for CECL on premiums receivable	19.2	17.9
Reinsurance Recoverable, Allowance for Credit Loss	$ 0.9	$ 0.9
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	58,184,861	58,055,968
Common stock, shares outstanding (in shares)	24,556,706	25,369,753
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Treasury Stock, Common, Shares	33,628,155	32,686,215

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Net premiums earned	$ 749.5	$ 721.9	$ 675.2
Net investment income	107	106.5	89.8
Net realized and unrealized gains (losses) on investments	24.1	22.7	(51.8)
Other income (loss)	0.1	(0.2)	0.3
Total revenues	880.7	850.9	713.5
Expenses
Losses and loss adjustment expenses	456.2	405.7	391
Commission expense	101.2	100	95.9
Underwriting and general and administrative expenses	176.5	180	167.3
Interest and financing expenses	0.1	5.8	3.5
Other expenses		11
Total expenses	734	702.5	657.7
Net income before income taxes	146.7	148.4	55.8
Income tax expense	28.1	30.3	7.4
Net income	118.6	118.1	48.4
Comprehensive income (loss)
Unrealized AFS investment (losses) gains during the period, net of tax benefit (expense) of $0.9, $(12.3), and $53.8 for the years ended December 31, 2024, 2023, and 2022, respectively	(3.5)	46.6	(202.3)
Reclassification adjustment for realized AFS investment losses in net income, net of tax (benefit) of $(1.8), $(1.7), and $(0.8) for the years ended December 31, 2024, 2023, and 2022, respectively	7	6.3	2.8
Other comprehensive income (loss), net of tax	3.5	52.9	(199.5)
Total comprehensive income (loss)	$ 122.1	$ 171	$ (151.1)
Earnings per common share (Note $18):
Basic	$ 4.73	$ 4.48	$ 1.76
Diluted	4.71	4.45	1.75
Cash dividends declared per common share and eligible equity plan awards	$ 1.18	$ 1.10	$ 3.28
Insurance Operations [Member]
Revenues
Net premiums earned	$ 749.5	$ 721.9	$ 675.2
Net investment income	107	106.5	89.8
Net realized and unrealized gains (losses) on investments	24.1	22.7	(51.8)
Other income (loss)	0.1	(0.2)	0.3
Total revenues	880.7	850.9	713.5
Expenses
Losses and loss adjustment expenses	456.2	405.7	391
Commission expense	101.2	100	95.9
Interest and financing expenses	0.1	5.8	3.5
Other expenses	0	11	0
Total expenses	734	702.5	657.7
Net income before income taxes	146.7	148.4	55.8
Income tax expense	28.1	30.3	7.4
Net income	$ 118.6	$ 118.1	$ 48.4

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income Parentheticals - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Parentheticals [Abstract]
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	$ 0.9	$ (12.3)	$ 53.8
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	$ (1.8)	$ (1.7)	$ (0.8)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income, Net	Treasury Stock, Common
Stockholders' equity, shares at Dec. 31, 2021		57,690,254
Stockholders' equity, value at Dec. 31, 2021	$ 1,213.1	$ 0.6	$ 410.7	$ 1,338.5	$ 60.6	$ (597.3)
Stock-based obligations (Note 14), shares		0
Stock-based obligations (Note 14), value	5.1	$ 0	5.1	0	0	0
Stock-options exercised, shares		41,665
Stock options exercised, value	1.1	$ 0	1.1	0	0	0
Vesting of restricted stock units, net of shares withheld to satisfy minimum tax withholding (Note 14), shares		144,368
Vesting of restricted stock units, net of shares withheld to satisfy minimum tax withholding (Note 14), value	(2.3)	$ 0	(2.3)	0	0	0
Acquisition of treasury stock (Note 13), shares		0
Acquisition of treasury stock (Note 13), value	(30.4)	$ 0	0	0	0	(30.4)
Dividend to common stockholders, shares		0
Dividend to common stockholders, value	(91.3)	$ 0	0	(91.3)	0	0
Net income for the period	48.4	0	0	48.4	0	0
Other comprehensive income (loss), net of tax	(199.5)	$ 0	0	0	(199.5)	0
Stockholders' equity, shares at Dec. 31, 2022		57,876,287
Stockholders' equity, value at Dec. 31, 2022	944.2	$ 0.6	414.6	1,295.6	(138.9)	(627.7)
Stock-based obligations (Note 14), shares		0
Stock-based obligations (Note 14), value	6.1	$ 0	6.1	0	0	0
Stock-options exercised, shares		23,500
Stock options exercised, value	0.7	$ 0	0.7	0	0	0
Vesting of restricted stock units, net of shares withheld to satisfy minimum tax withholding (Note 14), shares		156,181
Vesting of restricted stock units, net of shares withheld to satisfy minimum tax withholding (Note 14), value	(1.6)	$ 0	(1.6)	0	0	0
Acquisition of treasury stock (Note 13), shares		0
Acquisition of treasury stock (Note 13), value	(77.1)	$ 0	0	0	0	(77.1)
Dividend to common stockholders, shares		0
Dividend to common stockholders, value	(29.4)	$ 0	0	(29.4)	0	0
Net income for the period	118.1	0	0	118.1	0	0
Other comprehensive income (loss), net of tax	$ 52.9	$ 0	0	0	52.9	0
Stockholders' equity, shares at Dec. 31, 2023	58,055,968	58,055,968
Stockholders' equity, value at Dec. 31, 2023	$ 1,013.9	$ 0.6	419.8	1,384.3	(86)	(704.8)
Stock-based obligations (Note 14), shares		0
Stock-based obligations (Note 14), value	6.2	$ 0	6.2	0	0	0
Stock-options exercised, shares		0
Stock options exercised, value	0	$ 0	0	0	0	0
Vesting of restricted stock units, net of shares withheld to satisfy minimum tax withholding (Note 14), shares		128,893
Vesting of restricted stock units, net of shares withheld to satisfy minimum tax withholding (Note 14), value	(1.8)	$ 0	(1.8)	0	0	0
Acquisition of treasury stock (Note 13), shares		0
Acquisition of treasury stock (Note 13), value	(41.7)	$ 0	0	0	0	(41.7)
Dividend to common stockholders, shares		0
Dividend to common stockholders, value	(30)	$ 0	0	(30)	0	0
Net income for the period	118.6	0	0	118.6	0	0
Other comprehensive income (loss), net of tax	$ 3.5	$ 0	0	0	3.5	0
Stockholders' equity, shares at Dec. 31, 2024	58,184,861	58,184,861
Stockholders' equity, value at Dec. 31, 2024	$ 1,068.7	$ 0.6	$ 424.2	$ 1,472.9	$ (82.5)	$ (746.5)

Consolidated Statements of St_2

Consolidated Statements of Stockholders Equity Parentheticals - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Consolidated Statement of Stockholders Equity Parentheticals [Abstract]
Other Comprehensive Income (Loss), Tax	$ (0.9)	$ (14)	$ 53

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities
Net income	$ 118.6	$ 118.1	$ 48.4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3.6	4.8	5.3
Stock-based compensation	6.3	6.2	5.1
Amortization of cloud computing arrangements	13.1	16.7	16.4
Amortization of discounts and premiums on investments, net	(1)	2.4	3
Allowance for expected credit losses	1.3	5.1	2.8
Deferred income tax (benefit) expense	4.1	5.3	(17.4)
Net realized and unrealized (gains) losses on investments	(24.1)	(22.7)	51.8
Asset impairment and related charges	0	4.2	0
Noncash operating lease term adjustment	0	(1)	0
Change in operating assets and liabilities:
Premiums receivable	(3.2)	(58.6)	(63.7)
Reinsurance recoverable on paid and unpaid losses	16	17.5	32.2
Cloud computing arrangements	(2.4)	(3.4)	(15.4)
Operating lease right-of-use-assets	1.4	6.4	2.7
Current federal income taxes	(8.4)	(6.7)	8.8
Unpaid losses and loss adjustment expenses	(76.3)	(76.2)	(20.5)
Unearned premiums	22.5	40.2	34.8
Accounts payable, accrued expenses and other liabilities	3.3	3.7	7.2
Deferred reinsurance gain–LPT Agreement	(5.2)	(6.9)	(8.3)
Contingent commission receivable–LPT Agreement	14.2	(0.3)	0
Operating lease liabilities	(1.7)	(6.7)	(3)
Non-cancellable obligations	(3.2)	(9.1)	4.4
Other	(2.5)	10.4	5.2
Net cash provided by operating activities	76.4	49.4	99.8
Investing activities
Purchases of fixed maturity securities	(722.4)	(416.4)	(611.4)
Purchases of equity securities	(61.4)	(39.8)	(124.9)
Purchases of short-term investments	(39.8)	(68.7)	(132.7)
Purchases of other invested assets	(8.4)	(28.1)	(20.3)
Proceeds from sale of fixed maturity securities	342.8	558	313.8
Proceeds from sale of equity securities	45	53.2	216.3
Proceeds from maturities and redemptions of fixed maturity securities	214.7	162.7	195
Proceeds from maturities of short-term investments	73.1	157	24
Net change in unsettled investment purchases and sales	1.6	1.6	(3.3)
Capital expenditures and other	(4.9)	(2.2)	(2.6)
Net cash (used in) provided by investing activities	(159.7)	377.3	(146.1)
Financing activities
Acquisition of common stock and excise tax payments	(42.6)	(76.1)	(30.4)
Cash transactions related to stock-based compensation	(1.8)	(1)	(1.2)
Dividends paid to stockholders	(30.3)	(29.7)	(90.3)
Proceeds from FHLB advances	0	0	182.5
Repayments of Notes Payable	0	(182.5)	0
Proceeds from Lines of Credit	0	0	10
Repayments of line of credit advances	0	0	(10)
Payments on finance leases	(0.1)	(0.2)	(0.2)
Net cash used in financing activities	(74.8)	(289.5)	60.4
Net (decrease) increase in cash, cash equivalents, and restricted cash	(158.1)	137.2	14.1
Cash, cash equivalents, and restricted cash at the beginning of the period	226.6	89.4	75.3
Cash, cash equivalents, and restricted cash at the end of the period	68.5	226.6	89.4
Cash paid for federal income taxes	31	30.4	15.1
Cash paid for state income taxes	1.4	1.5	0.7
Cash paid for interest	0.1	5.8	2.6
Non-cash transactions
Financed property and equipment purchases	0.1	0	0.1
Cash, cash equivalents, and restricted cash
Cash and cash equivalents	68.3	226.4
Restricted cash and cash equivalents	0.2	0.2
Total cash, cash equivalents, and restricted cash	$ 68.5	$ 226.6	$ 89.4

Basis of Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2024
Basis of Presentation [Abstract]
Basis of Presentation	Basis of Presentation and Summary of Operations Nature of Operations and Organization Employers Holdings, Inc. (EHI) is a Nevada holding company. Through its wholly owned insurance subsidiaries, Employers Insurance Company of Nevada (EICN), Employers Compensation Insurance Company (ECIC), Employers Preferred Insurance Company (EPIC), Employers Assurance Company (EAC), and Cerity Insurance Company (CIC), EHI is engaged in the commercial property and casualty insurance industry, specializing in workers' compensation products and services. Unless otherwise indicated, all references to the "Company" refer to EHI, together with its subsidiaries. In 1999, the Nevada State Industrial Insurance System (the Fund) entered into a retroactive 100% quota share reinsurance agreement (the LPT Agreement) through a loss portfolio transfer transaction with third party reinsurers. The LPT Agreement commenced on June 30, 1999 and will remain in effect until: (i) all claims under the covered policies have closed; (ii) the LPT Agreement is commuted or terminated upon the mutual agreement of the parties; or (iii) the reinsurers' aggregate maximum limit of liability is exhausted, whichever occurs first. The LPT Agreement does not provide for any additional termination terms. On January 1, 2000, EICN assumed all of the assets, liabilities and operations of the Fund, including the Fund's rights and obligations associated with the LPT Agreement. See Notes 2 and 10. The Company accounts for the LPT Agreement as retroactive reinsurance. Upon entry into the LPT Agreement, an initial deferred reinsurance gain (the Deferred Gain) was recorded as a liability on the Company's Consolidated Balance Sheets. The Company was also entitled to receive a contingent profit commission (Contingent Commission) under the LPT Agreement through June 30, 2024. The Contingent Commission, of which the final payment was determined to be $14.6 million, was based on actual paid losses under the LPT Agreement through that date and was recorded as an asset on the Company's Consolidated Balance Sheets. The Company received the final payment of the Contingent Commission during the third quarter of 2024. Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). All intercompany transactions and balances have been eliminated in consolidation. The Company operates as a single operating segment, Insurance Operations , through its wholly owned subsidiaries. The Company considers an operating segment to be any component of its business whose operating results are regularly reviewed by the Company's chief operating decision maker (CODM) to make decisions about resources to be allocated to the segment and assess its performance based on discrete financial information. Prior to December 31, 2023, the Company operated through two reportable segments: Employers and Cerity . Detailed financial information about the Company's single operating segment is presented in Note 19. Use of Estimates The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. As a result, actual results could differ from these estimates. The most significant areas that require management judgment are the estimate of unpaid losses and loss adjustment expenses (LAE), evaluation of reinsurance recoverables, recognition of premium revenue, recoverability of deferred income taxes, and valuation of investments. Reclassifications Certain prior period information has been recast to conform to the 2024 presentation.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Summary of Significant Accounting Policies [Abstract]
Significant Accounting Policies	Summary of Significant Accounting Policies Cash and Cash Equivalents The Company considers all liquid investments with maturities of less than three months, as measured from the date of purchase, to be cash equivalents. Restricted Cash and Cash Equivalents Restricted cash and cash equivalents represent cash and cash equivalents held in trust in order to secure certain of the Company's obligations and, accordingly, are restricted as to withdrawal or usage. As of December 31, 2024 and 2023 the Company held $3.0 million in cash and investments in trust for reinsurance obligations, of which $0.2 million, represented restricted cash and cash equivalents for each year. Short-Term Investments The Company considers all liquid investments with maturities of between three and twelve months, as measured from the date of purchase, to be short-term investments. Investment Securities The Company's investments in fixed maturity securities and short-term investments are classified as available-for-sale (AFS) and are reported at fair value with unrealized gains and losses excluded from earnings and reported as a separate component of stockholders' equity, net of deferred taxes, in Accumulated other comprehensive loss on the Company's Consolidated Balance Sheets. The Company's investments in equity securities at fair value are not classified as AFS and changes in fair value are included in Net realized and unrealized gains and losses on investments on the Company's Consolidated Statements of Comprehensive Income (Loss). The Company's investment in FHLB stock is presented within Equity securities at cost on the Company's Consolidated Balance Sheets. The Company's investments in other invested assets are reported at net asset value and changes in the value of these investments are included in Net realized and unrealized gains (losses) on investments on the Company's Consolidated Statements of Comprehensive Income (Loss). The Company's investments in fixed maturity securities are presented net of an allowance for current expected credit losses (CECL). The Company first assesses whether it intends to sell, or it is more likely than not that it will be required to sell, the security before recovery of its amortized cost basis. If either of the criteria is met, the security's amortized cost basis is written down to its fair value. For AFS debt securities that do not meet either criteria, the Company evaluates whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. The changes in the Company's allowance for CECL on investments are included in Net realized and unrealized gains (losses) on investments on the Company's Consolidated Statements of Comprehensive Income (Loss) (see Note 6). Investment income consists primarily of interest and dividends generated by investment securities. Interest is recorded as earned on an accrual basis and dividends are recorded as earned at the ex-dividend date. Interest income on mortgage-backed and asset-backed securities is determined using the effective-yield method based on estimated principal repayments. Mortgage-backed securities are adjusted for the effects of changes in prepayment assumptions on the related accretion of discount or amortization of premium of such securities using the retrospective method. Realized gains and losses on investments are determined on a specific-identification basis. Recognition of Revenue and Expense Revenue Recognition Premiums written are recognized as revenues, net of any applicable underlying reinsurance coverage, and recognized as premiums earned, over the period of the contract in proportion to the amount of insurance protection provided. At the end of the policy term, premium audits are performed on substantially all policyholder accounts to determine the actual amount of net premiums earned for that policy year. Earned but unbilled premiums include estimated future audit premiums based on the Company's historical experience. These estimates are subject to changes in policyholders' payrolls and employee job classifications, economic conditions, and seasonality, and are continually reviewed and adjusted as experience develops or new information becomes known. Audit premium adjustments are included in premiums earned; however, these adjustments are partially offset by the resulting changes in losses and LAE, commission expenses, and premium taxes. The Company's premiums receivable on its Consolidated Balance Sheets included $25.7 million and $42.9 million of additional premiums expected to be received from policyholders for premium audits at December 31, 2024 and 2023, respectively. The Company establishes an allowance for CECL (see Note 6) on its premiums receivable through a charge included in underwriting and general and administrative expenses in its Consolidated Statements of Comprehensive Income (Loss). This allowance for CECL is determined based on estimates (collectability and historical payment patterns) and assumptions to project future experience. After all collection efforts have been exhausted, the Company reduces the allowance for CECL for write-offs of premiums receivable that have been deemed uncollectible. The Company's allowance for CECL was $19.2 million and $17.9 million at December 31, 2024 and 2023, respectively. The Company had write-offs charged against CECL of $13.8 million, $3.9 million, and $2.0 million for the years ended December 31, 2024, 2023, and 2022, respectively. Deferred Policy Acquisition Costs Policy acquisition costs, those costs that relate directly to the successful acquisition of new or renewal insurance contracts, including underwriting, policy issuance and processing, medical and inspection, sales force contract selling and commissions are deferred and amortized as the related premiums are earned. Amortization of deferred policy acquisition costs for the years ended December 31, 2024, 2023, and 2022, was $119.6 million, $113.8 million, and $106.4 million, respectively. If the sum of a policy's expected losses and LAE and deferred policy acquisition costs exceeds the related unearned premiums and projected investment income, a premium deficiency is determined to exist. In this event, deferred policy acquisition costs are immediately expensed to the extent necessary to eliminate the premium deficiency. If the premium deficiency exceeds deferred acquisition costs, a liability is accrued for the excess deficiency. There were no premium deficiency adjustments recognized during the years ended December 31, 2024, 2023, and 2022. Unpaid Loss and LAE Reserves Unpaid loss and LAE reserves represent management's best estimate of the ultimate net cost of all reported and unreported losses incurred for the applicable periods, less payments made. The estimated reserves for losses and LAE include the accumulation of estimates for all claims reported prior to the balance sheet date, estimates of claims incurred but not reported, and estimates of expenses for investigating and adjusting all incurred and unadjusted claims (based on projections of relevant historical data). Amounts reported are subject to the impact of future changes in economic, regulatory and social conditions. Management believes that, subject to the inherent variability in any such estimate, the reserves are within a reasonable and acceptable range of adequacy. Estimates for claims prior to the balance sheet date are continually monitored and reviewed, and as settlements are made or reserves adjusted, the differences are reported in current operations. Salvage and subrogation recoveries are estimated based on a review of the level of historical salvage and subrogation recoveries. Reinsurance In the ordinary course of business, the Company purchases excess of loss reinsurance in order to protect it against the impact of large and/or catastrophic losses. The Company is also a party to the LPT Agreement (see Note 10). These reinsurance arrangements reduce the Company's exposure to such losses since its reinsurers are liable to the Company to the extent of the reinsurance protection provided. However, the Company remains liable for all losses it incurs to the extent that any reinsurer is unable or unwilling to make timely payments under its reinsurance agreements. Balances due from reinsurers on unpaid losses, including an estimate of such recoverables related to reserves for incurred but not reported losses, are reported as reinsurance recoverables on the Company's Consolidated Balance Sheets. Reinsurance recoverables on paid losses represent amounts currently due from reinsurers. Reinsurance recoverables on unpaid losses represent amounts that will be collectible from reinsurers once the losses are paid. Reinsurance recoverables on unpaid losses and LAE amounted to $411.5 million and $427.5 million at December 31, 2024 and 2023, respectively. The Company's reinsurance recoverables are presented net of an allowance for CECL. The changes in the Company's allowance for CECL are included in underwriting and general and administrative expenses on the Company's Consolidated Statements of Comprehensive Income (Loss) (see Note 6). This allowance for CECL is determined based on historical information, financial strength of reinsurers, collateralization amounts and ratings to determine the appropriateness of the allowance. Ceded reinsurance premiums are accounted for on a basis consistent with those used in accounting for the underlying premiums, and are reported as reductions to arrive at net premiums written and earned. Ceded losses and LAE are also accounted for on a basis consistent with those used in accounting for the original policies issued and the terms of the relevant reinsurance agreement, and are recorded as reductions to losses and LAE incurred. Pursuant to the LPT Agreement, LAE is deemed to be 7% of total losses paid and is payable to the Company as compensation for management of the claims under the LPT Agreement. The Deferred Gain is amortized using the recovery method, whereby the amortization is determined by the proportion of actual reinsurance recoveries to total estimated recoveries through the life of the LPT Agreement, and is recorded in losses and LAE incurred in the Company's Consolidated Statements of Comprehensive Income (Loss). Any adjustment to the estimated loss and LAE reserves ceded under the LPT Agreement results in a cumulative adjustment to the Deferred Gain, which is also recognized in losses and LAE incurred in the Company's Consolidated Statements of Comprehensive Income (Loss), such that the Deferred Gain reflects the balance that would have existed had the revised reserves been recognized at the inception of the LPT Agreement (LPT Reserve Adjustment). Additionally, the Company was entitled to a Contingent Commission under the LPT Agreement through June 30, 2024. The Contingent Commission was equal to 30% of the favorable difference between actual paid losses and LAE and expected paid losses and LAE as established in the LPT Agreement based on losses paid through that date. The Company recorded an estimate of Contingent Commission on its Consolidated Balance Sheets as Contingent commission receivable–LPT Agreement and a corresponding liability was recorded as Deferred reinsurance gain–LPT Agreement. The Contingent commission receivable–LPT Agreement was reduced as amounts were received from participating reinsurers. The Contingent Commission was payable every five years beginning June 30, 2004, and the final payment of the Contingent Commission of $14.6 million was received in the third quarter of 2024. The Deferred reinsurance gain–LPT Agreement is amortized using the recovery method. The amortization of the Contingent Commission was determined by the proportion of actual reinsurance recoveries to total estimated recoveries over the life of the Contingent Commission and was recorded in losses and LAE incurred in the Company's Consolidated Statements of Comprehensive Income (Loss). Any adjustment to the Contingent Commission under the LPT Agreement resulted in a cumulative adjustment to the Deferred Gain, which was also recognized in losses and LAE incurred in the Company's Consolidated Statements of Comprehensive Income (Loss), such that the Deferred Gain reflects the balance that would have existed had the revised Contingent Commission been recognized at the inception of the LPT Agreement (LPT Contingent Commission Adjustment). Property and Equipment Property and equipment are stated at cost less accumulated depreciation (see Note 7). Expenditures for maintenance and repairs are charged against operations as incurred. Electronic data processing equipment, software, furniture and equipment, and automobiles are depreciated using the straight-line method over 3 to 7 years. Leasehold improvements are carried at cost less accumulated amortization. The Company amortizes leasehold improvements using the straight-line method over the lesser of the useful life of the asset or the remaining original lease term, excluding options or renewal periods. Leasehold improvements are generally amortized over 3 to 8 years. Cloud Computing Arrangements The Company capitalizes software license fees and implementation costs associated with hosting arrangements that are service contracts. These amounts are included in Cloud computing arrangements on the Company's Consolidated Balance Sheets. Amortization of the software license fees is calculated using the straight-line method over the term of the service contract or based on the expected utilization of the asset. Amortization of the implementation costs are calculated using the straight-line method based on the term of the service contract and commence once the module or component is ready for its intended use, regardless of whether the hosted software has been placed into service, and will be recognized over the remaining life of the service contract. Operating leases The Company determines if an arrangement is a lease at the inception of the transaction. Leased office property meets the definition of operating leases under ASC 842 and is presented as a right-of-use asset (ROU asset) and lease liability on the Company's Consolidated Balance Sheets. ROU assets represent the right to use an underlying asset for the lease payments arising from the lease transaction. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of the lease payments over the lease term. The Company uses collateralized incremental borrowing rates to determine the present value of lease payments. The ROU assets also include lease payments less any lease incentives within a lease agreement. The Company's lease terms may include options to extend or terminate a lease. Lease expense for lease payments is recognized on a straight-line basis over the lease term. See Note 12 for additional disclosures related to operating leases. Finance Leases Leased property and equipment meeting finance lease criteria are capitalized at the lower of the present value of the related lease payments or the fair value of the leased asset at the inception of the lease. Financing leases for automobiles are included in property and equipment in other liabilities on the Company's Consolidated Balance Sheets. Amortization is calculated using the straight-line method based on the term of the lease and is included in the depreciation expense of property and equipment. See Note 12 for additional disclosures related to finance leases. Income Taxes The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the Company's financial statements. Under this method, the Company determines deferred tax assets and liabilities on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax rates in effect for the year in which the differences are expected to reverse. The Company recognizes tax positions that are determined to be more likely than not of being sustained upon examination. Recognized income tax positions are measured at the largest amount that has a greater than 50% likelihood of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company recognizes deferred tax assets when it determines that such assets are more likely than not to be realized in future periods. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, tax-planning strategies, projected future taxable income, projected future tax rates, and results of recent operations. If the Company determines that it is not more likely than not that it could realize its deferred tax assets in future periods, it would establish a deferred tax asset valuation allowance that would increase the Company's provision for income taxes. If the Company determines that it would be able to realize its deferred tax assets in the future in excess of its net recorded amount, the Company would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. The Company recognizes accrued interest and penalties, if any, in income taxes. For the years ended December 31, 2024 and 2023, the Company incurred no material interest and penalties. Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk are primarily cash and cash equivalents (including restricted cash equivalents), short-term investments, investment securities, premiums receivable, and reinsurance recoverable balances. The Company's cash equivalents and short-term investments include investments in money market securities and securities backed by the U.S. government. The Company's investment securities are diversified throughout many industries and geographic regions and include investments in U.S. government and U.S. government-sponsored enterprises. The Company believes that it has no significant concentrations of credit risk from a single issue or issuer within its cash equivalents, short-term investments and investment securities, other than concentrations in U.S. government and U.S. government-sponsored enterprises. The Company's premiums receivable are generally diversified due to the large number of entities composing the Company's policyholder base and their dispersion across many different industries. The Company monitors the financial condition of its reinsurers to minimize its exposure to significant losses from reinsurer insolvencies. Fair Value of Financial Instruments The fair values of the Company's financial instruments have been determined using available market information and other appropriate valuation methodologies. Judgment is required in developing fair value estimates where quoted market prices are not available. Accordingly, these estimates are not necessarily indicative of the amounts that could be realized in a current market exchange. The use of different market assumptions or estimating methodologies may have an effect on the estimated fair value amounts. The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments: Cash and cash equivalents, short-term investments, premiums receivable, accounts payable and accrued expenses, and other liabilities. The carrying amounts for each of these financial instruments as reported in the Company's Consolidated Balance Sheets approximate their fair values. Investment securities. The Company's investment securities are predominantly valued on the basis of actual market transactions or observable inputs. A small portion of the Company's investment securities are valued on the basis of pricing models with significant unobservable inputs or nonbinding broker quotes (see Note 4). Goodwill and Other Intangible Assets The Company formally tests for impairment of goodwill and intangible assets in the fourth quarter of each year. At the end of each quarter, management further considers the results of the previous analysis as well as any recent developments that may constitute triggering events requiring the impairment analysis of goodwill and other intangible assets to be updated. The Company assessed the effects of current economic conditions on the Company's financial condition and results of operations and changes in the Company's fair value and determined that there were no impairments of these assets as of December 31, 2024 and 2023. Intangible assets related to state licenses are not subject to amortization. Intangible assets related to insurance relationships were amortized in proportion to the expected period of benefit and were fully amortized as of December 31, 2018. The gross carrying value, accumulated amortization, and net carrying value for the Company's intangible assets, by major class, as of December 31, were as follows: 2024 2023 Gross Accumulated Net Gross Accumulated Net (in millions) State licenses $ 13.5 $ — $ 13.5 $ 13.5 $ — $ 13.5 Insurance relationships 9.4 $ (9.4) — 9.4 (9.4) — Other 0.1 — 0.1 0.1 — 0.1 Total $ 23.0 $ (9.4) $ 13.6 $ 23.0 $ (9.4) $ 13.6 There was no amortization expense in 2024 or 2023. Amortization expenses, when recognized, are included in the Company's Consolidated Statements of Comprehensive Income (Loss) in underwriting and general and administrative expenses. Stock-Based Compensation The Company provides stock-based compensation to its directors and certain of its employees, which is recognized in its Consolidated Statements of Comprehensive Income (Loss) and based on estimated grant date fair values over the relevant service period (see Note 14).

New Accounting Standards

New Accounting Standards	12 Months Ended
	Dec. 31, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Standards	New Accounting Standards Recently Issued Accounting Standards In November 2024, the Financial Accounting Standards Board (FASB) issued ASU 2024-03, Income Statement - Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40) . The amendments in this update require further disaggregation of certain relevant costs and expenses into specified categories in disclosures within the footnotes to the financial statements at each interim and annual reporting period. Relevant expense captions required to be disclosed include the following, as applicable: (i) purchases of inventory; (ii) employee compensation; (iii) depreciation; (iv) intangible asset amortization; and (v) depreciation, depletion, and amortization recognized as part of oil and gas-producing activities (or other depletion expenses). Also, the amendments require a qualitative description of the amounts of other items remaining in relevant expense captions that are not separately disaggregated. In addition, a separate disclosure of the total amount of selling expenses should be presented and, in annual reporting periods, an entity's definition of selling expenses should be disclosed. This update is effective for fiscal years beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The Company will adopt this standard when it becomes effective. Recently Adopted Accounting Standards In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280), Improvements to Reportable Segment Disclosures . The amendments in this update improve disclosures about reportable segments and provide more detailed information about a reportable segment's expenses. Specifically, the amendments in this update require that a public entity disclose, on an annual and interim basis: (i) significant segment expenses that are regularly provided to the CODM; (ii) an amount for other segment items by reportable segment and a description of their composition; (iii) all annual disclosures about a reportable segment's profit or loss and assets currently required by Topic 280 in interim periods; (iv) the measures the CODM uses in assessing performance and allocating resources; and (v) the title and position of the CODM. Public entities that have a single reporting segment are also required to provide all the disclosures required by this amendment, along with all existing segment disclosures in Topic 280. This update is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The Company adopted this update as of December 31, 2024 (see Note 19). In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740) . This update requires public business entities to annually disclose specific categories within the income tax rate reconciliation, and provide additional information for reconciling items that meet a certain quantitative threshold. Additionally, the amendments in this update require entities to disclose certain information about income taxes paid, income tax disaggregation, disclosures around unrecognized tax benefits, and the removal of disclosures related to temporary differences surrounding deferred tax liabilities to enhance the transparency and decision usefulness of income tax disclosures. This update is effective for fiscal years beginning after December 15, 2024 and early adoption is permitted. The Company early adopted this update as of December 31, 2023 (see Note 8). In March 2020, the FASB issued Accounting Standards Update (ASU) 2020-04, Reference Rate Reform (Topic 848) . This update provided optional transition guidance to ease the potential accounting burden associated with transitioning away from the London Interbank Offered Rate (LIBOR), with optional expedients and exceptions related to the application of US GAAP to contracts, hedging relationships and other transactions affected by reference rate reform. Companies could elect to adopt this ASU through December 31, 2024. The Company determined that there was no impact of LIBOR transitioning on its existing contracts and investments.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2024
Fair Value of Financial Instruments [Abstract]
Fair Value of Financial Instruments	Valuation of Financial Instruments Financial Instruments Carried at Fair Value The carrying value and the estimated fair value of the Company's financial instruments at fair value were as follows as of December 31: 2024 2023 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial assets (in millions) Total investments at fair value (Note 5) $ 2,351.6 $ 2,351.6 $ 2,180.6 $ 2,180.6 Cash and cash equivalents 68.3 68.3 226.4 226.4 Restricted cash and cash equivalents 0.2 0.2 0.2 0.2 Assets and liabilities recorded at fair value on the Company's Consolidated Balance Sheets are categorized based upon the levels of judgment associated with the inputs used to measure their fair value. Level inputs are defined as follows: • Level 1 - Inputs are unadjusted quoted market prices for identical assets or liabilities in active markets at the measurement date. • Level 2 - Inputs other than Level 1 prices that are observable for similar assets or liabilities through corroboration with market data at the measurement date. • Level 3 - Inputs that are unobservable that reflect management's best estimate of what willing market participants would use in pricing the assets or liabilities at the measurement date. The Company uses third party pricing services to assist with its investment accounting function. The ultimate pricing source varies depending on the investment security and pricing service used, but investment securities valued on the basis of observable inputs (Levels 1 and 2) are generally assigned values on the basis of actual transactions. Securities valued on the basis of pricing models with significant unobservable inputs or non-binding broker quotes are classified as Level 3. The Company performs quarterly analyses on the prices it receives from third parties to determine whether the prices are reasonable estimates of fair value, including confirming the fair values of these securities through observable market prices using an alternative pricing source, as it is ultimately management's responsibility to ensure that the fair values reflected in the Company's consolidated financial statements are appropriate. If differences are noted in these analyses, the Company may obtain additional information from other pricing services to validate the quoted price. The Company bases all of its estimates of fair value for assets on bid prices, when available, as they represent what a third-party market participant would be willing to pay in an arm's length transaction. For securities not actively traded, third party pricing services may use quoted market prices of similar instruments or discounted cash flow analyses, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include, but are not limited to, broker quotes, benchmark yields, credit spreads, default rates, and prepayment speed assumptions. There were no material adjustments to the valuation methodology utilized by third party pricing services as of December 31, 2024 and 2023. These methods of valuation only produce an estimate of fair value if there is objectively verifiable information to produce a valuation. If objectively verifiable information is not available, the Company would be required to produce an estimate of fair value using some of the same methodologies, making assumptions for market-based inputs that are unavailable. As of December 31, 2024, the Company held $65.6 million of fixed maturity securities at fair value that were designated Level 3. These private placement securities were designated as Level 3 securities due to the limited amount of observable market information available. The following table presents the Company's investments at fair value and the corresponding fair value measurements. December 31, 2024 December 31, 2023 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 (in millions) Fixed maturity securities U.S. Treasuries $ — $ 59.3 $ — $ — $ 58.4 $ — U.S. Agencies — — — — 2.1 — States and municipalities — 159.3 — — 210.2 — Corporate securities — 751.7 51.3 — 863.7 32.1 Residential mortgage-backed securities — 619.7 — — 362.2 — Commercial mortgage-backed securities — 65.2 — — 63.8 — Asset-backed securities — 199.7 14.3 — 113.9 14.1 Collateralized loan obligations — 35.3 — — 91.5 — Foreign government securities — 9.5 — — 10.4 — Other securities — 132.1 — — 113.9 — Total fixed maturity securities $ — $ 2,031.8 $ 65.6 $ — $ 1,890.1 $ 46.2 Equity securities at fair value Industrial and miscellaneous $ 215.1 $ — $ — $ 181.7 $ — $ — Other 39.0 — — 29.5 — — Total equity securities at fair value $ 254.1 $ — $ — $ 211.2 $ — $ — Short-term investments $ 0.1 $ — $ — $ 17.6 $ 15.5 $ — Total investments at fair value $ 254.2 $ 2,031.8 $ 65.6 $ 228.8 $ 1,905.6 $ 46.2 Financial Instruments Carried at Cost Each of the Company's insurance subsidiaries are members of the Federal Home Loan Bank of San Francisco (FHLB). Members are required to purchase a designated amount of FHLB capital stock to maintain their membership, in addition to maintaining collateral deposits that back any funds advanced and standby letters of credit issued (See Note 11). The Company's investment in FHLB stock is recorded at cost, which approximates fair value, as purchases and sales of these securities are at par value with the issuer. FHLB stock is considered a restricted security and is periodically evaluated by the Company for impairment based on the estimated ultimate recovery of par value. Financial Instruments Carried at Net Asset Value (NAV) The Company has investments in private equity limited partnership interests that are included in Other invested assets on the Company's Consolidated Balance Sheets. These investments do not have readily determinable fair values and are carried at net asset value (NAV) and therefore are excluded from the fair value hierarchy. The Company initially estimates the value of these investments using the transaction price. In subsequent periods, the Company measures these investments using NAV per share provided quarterly by the general partner, based on financial statements that are audited annually. These investments are generally not redeemable by the investees and cannot be sold without approval of the general partner. These investments have a fund term of 3 to 12 years, subject to two or three one Additionally, certain cash equivalents, principally money market securities, are measured using NAV, which approximates fair value. The following table presents cash and investments carried at NAV on the Company's Consolidated Balance Sheets. December 31, 2024 December 31, 2023 (in millions) Cash equivalents measured at NAV 30.7 197.2 Other invested assets carried at NAV 106.6 91.5 The following table provides a reconciliation of the beginning and ending balances that are measured using Level 3 inputs. Years Ended December 31, 2024 2023 (in millions) Beginning balance $ 46.2 $ 24.2 Purchases 19.3 20.7 Unrealized gains included in comprehensive income or loss 0.1 1.3 Ending balance $ 65.6 $ 46.2

Investments

Investments	12 Months Ended
	Dec. 31, 2024
Investments [Abstract]
Investments	Investments The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the Company's AFS investments were as follows: Amortized Allowance for CECL Gross Gross Estimated At December 31, 2024 (in millions) Fixed maturity securities U.S. Treasuries $ 61.4 $ — $ 0.2 $ (2.3) $ 59.3 States and municipalities 163.0 — 1.1 (4.8) 159.3 Corporate securities 849.2 (0.2) 4.4 (50.4) 803.0 Residential mortgage-backed securities 663.5 — 1.6 (45.4) 619.7 Commercial mortgage-backed securities 69.6 (0.3) 0.1 (4.2) 65.2 Asset-backed securities 216.0 — 1.6 (3.6) 214.0 Collateralized loan obligations 35.5 — — (0.2) 35.3 Foreign government securities 12.7 — — (3.2) 9.5 Other securities (1) 132.2 (0.6) 0.9 (0.4) 132.1 Total fixed maturity securities 2,203.1 (1.1) 9.9 (114.5) 2,097.4 Short-term investments 0.1 — — — 0.1 Total AFS investments $ 2,203.2 $ (1.1) $ 9.9 $ (114.5) $ 2,097.5 At December 31, 2023 Fixed maturity securities U.S. Treasuries $ 60.3 $ — $ 0.6 $ (2.5) $ 58.4 U.S. Agencies 2.2 — — (0.1) 2.1 States and municipalities 212.3 — 3.1 (5.2) 210.2 Corporate securities 952.8 (2.1) 8.3 (63.2) 895.8 Residential mortgage-backed securities 399.3 — 0.9 (38.0) 362.2 Commercial mortgage-backed securities 70.2 — — (6.4) 63.8 Asset-backed securities 131.8 — 1.0 (4.8) 128.0 Collateralized loan obligations 92.2 — — (0.7) 91.5 Foreign government securities 12.7 — — (2.3) 10.4 Other securities (1) 114.2 (0.6) 1.0 (0.7) 113.9 Total fixed maturity securities 2,048.0 (2.7) 14.9 (123.9) 1,936.3 Short-term investments 33.1 — — — 33.1 Total AFS investments $ 2,081.1 $ (2.7) $ 14.9 $ (123.9) $ 1,969.4 (1) Other securities within fixed maturity securities consist of bank loans, which are classified as AFS and reported at fair value. The cost and estimated fair value of the Company's equity securities recorded at fair value at December 31, 2024 and 2023 were as follows: Cost Estimated Fair Value (in millions) At December 31, 2024 Equity securities at fair value Industrial and miscellaneous $ 117.4 $ 215.1 Other 27.6 39.0 Total equity securities at fair value $ 145.0 $ 254.1 At December 31, 2023 Equity securities at fair value Industrial and miscellaneous $ 104.4 $ 181.7 Other 21.5 29.5 Total equity securities at fair value $ 125.9 $ 211.2 The Company had Other invested assets totaling $106.6 million and $91.5 million (initial cost of $90.9 million and $82.5 million) at December 31, 2024 and 2023, respectively, consisting of private equity limited partnerships, which are carried at NAV based on information provided by the general partner. These investments are non-redeemable until conversion and are periodically evaluated by the Company for impairment based on the ultimate recovery of the investment. Changes in the value of these investments are recorded through Net realized and unrealized gains and losses on the Company's Consolidated Statements of Comprehensive Income (Loss). The amortized cost and estimated fair value of the Company's fixed maturity securities at December 31, 2024, by contractual maturity, are shown below. Expected maturities differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Estimated Fair Value (in millions) Due in one year or less $ 14.8 $ 14.8 Due after one year through five years 479.2 467.0 Due after five years through ten years 628.6 594.8 Due after ten years 95.9 86.6 Mortgage and asset-backed securities 984.6 934.2 Total $ 2,203.1 $ 2,097.4 The following is a summary of AFS investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or greater in each case as of December 31, 2024 and 2023. December 31, 2024 December 31, 2023 Estimated Fair Value Gross Unrealized Losses Number of Issues Estimated Fair Value Gross Unrealized Losses Number of Issues Less than 12 months: (dollars in millions) Fixed maturity securities U.S. Treasuries $ 26.5 $ (0.4) 8 $ 11.9 $ (0.1) 5 States and municipalities 48.0 (0.9) 20 39.5 (0.3) 15 Corporate securities 182.3 (4.0) 47 26.1 (0.8) 13 Residential mortgage-backed securities 190.6 (3.2) 111 15.8 (0.2) 15 Asset-backed securities 51.5 (0.8) 25 24.0 (0.1) 15 Other securities 29.2 (0.2) 133 12.6 (0.1) 70 Total fixed maturity securities 528.1 (9.5) 344 129.9 (1.6) 133 Total less than 12 months $ 528.1 $ (9.5) 344 $ 129.9 $ (1.6) 133 12 months or greater: Fixed maturity securities U.S. Treasuries $ 15.6 $ (1.9) 2 $ 23.7 $ (2.4) 7 U.S. Agencies — — — 2.2 (0.1) 1 States and municipalities 37.1 (3.9) 20 73.5 (4.9) 32 Corporate securities 430.0 (46.4) 219 684.5 (62.4) 331 Residential mortgage-backed securities 272.0 (42.2) 220 306.6 (37.8) 228 Commercial mortgage-backed securities 53.6 (4.2) 23 53.0 (6.4) 24 Asset-backed securities 42.0 (2.8) 27 47.0 (4.7) 29 Collateralized loan obligations 3.2 (0.2) 2 80.5 (0.7) 21 Foreign government securities 9.5 (3.2) 2 10.4 (2.3) 2 Other securities 2.5 (0.2) 20 10.2 (0.6) 58 Total fixed maturity securities 865.5 (105.0) 535 1,291.6 (122.3) 733 Total 12 months or greater $ 865.5 $ (105.0) 535 $ 1,291.6 $ (122.3) 733 The Company recorded a CECL allowance on its AFS debt securities of $1.1 million and $2.7 million as of December 31, 2024 and 2023, respectively (see Note 6). Those fixed maturity securities whose total fair value was less than amortized cost at December 31, 2024 and December 31, 2023, were those in which the Company had no intent, need or requirement to sell at an amount less than their amortized cost. Realized gains and losses on investments include the gain or loss on a security at the time of sale compared to its original or adjusted cost (equity securities and other invested assets) or amortized cost (fixed maturity securities). Realized losses on fixed maturity securities are also recognized when securities are written down as a result of an other-than-temporary impairment or for unfavorable changes in CECL. Reversals of previously recognized realized losses on fixed maturity securities can also result when securities are written up for favorable changes in CECL. Net realized gains on investments and the change in unrealized gains (losses) on the Company's investments recorded at fair value are determined on a specific-identification basis and were as follows: Gross Realized Gains Gross Realized Losses Net Decrease (Increase) Change in CECL Allowance Change in Net Unrealized Gains (Losses) Changes in Fair Value Reflected in Earnings Changes in Fair Value Reflected in AOCI (1) , before tax (in millions) Year Ended December 31, 2024 Fixed maturity securities $ 0.3 $ (10.7) $ 1.6 $ 4.4 $ (8.8) $ 4.4 Equity securities 4.9 (2.5) — 23.8 26.2 — Other invested assets — — — 6.7 6.7 — Total investments $ 5.2 $ (13.2) $ 1.6 $ 34.9 $ 24.1 $ 4.4 Year Ended December 31, 2023 Fixed maturity securities $ 1.0 $ (10.8) $ 1.8 $ 66.9 $ (8.0) $ 66.9 Equity securities 0.2 (5.7) — 32.5 27.0 — Other invested assets — — — 3.7 3.7 — Total investments $ 1.2 $ (16.5) $ 1.8 $ 103.1 $ 22.7 $ 66.9 Year Ended December 31, 2022 Fixed maturity securities $ 3.2 $ (2.5) $ (4.3) $ (252.5) $ (3.6) $ (252.5) Equity securities 41.2 (17.1) — (73.3) (49.2) — Other invested assets — — — 1.0 1.0 — Total investments $ 44.4 $ (19.6) $ (4.3) $ (324.8) $ (51.8) $ (252.5) (1) AOCI means Accumulated other comprehensive income or loss Proceeds from sales of fixed maturity securities were $342.8 million, $558.0 million and $313.8 million for years ended December 31, 2024, 2023, and 2022, respectively. Net investment income was as follows: Years Ended December 31, 2024 2023 2022 (in millions) Fixed maturity securities $ 91.1 $ 92.3 $ 81.1 Equity securities 6.8 6.8 8.3 Other invested assets 4.9 3.8 2.8 Short-term investments 1.5 2.6 0.2 Cash equivalents and restricted cash 6.8 4.7 2.1 Gross investment income 111.1 110.2 94.5 Investment expenses (4.1) (3.7) (4.7) Net investment income $ 107.0 $ 106.5 $ 89.8 The Company is required by various state laws and regulations to support, through securities on deposit or otherwise, its outstanding loss reserves in certain states in which it does business. These laws and regulations govern not only the amount but also the types of securities that are eligible for deposit. As of December 31, 2024 and 2023, securities having a fair value of $630.9 million and $748.1 million, respectively, were on deposit. Additionally, standby letters of credit from the FHLB were in place in lieu of $170.0 million and $70.0 million of securities on deposit as of December 31, 2024 and 2023, respectively (see Note 11). Certain reinsurance contracts require funds owned by the Company to be held in trust for the benefit of the ceding reinsurer to secure the outstanding liabilities assumed by the Company. The fair value of fixed maturity securities and restricted cash and cash equivalents held in trust for the benefit of ceding reinsurers at both December 31, 2024 and 2023 was $3.0 million.

Credit Losses

Credit Losses	12 Months Ended
	Dec. 31, 2024
Credit Loss [Abstract]
Allowance for Credit Losses	Current Expected Credit Losses Premiums Receivable Premiums receivable balances are all due within one year. The Company currently determines the allowance for premiums receivable based on an internal aging schedule using collectability and historical payment patterns, as well as current and expected future market conditions to determine the appropriateness of the allowance. Historical payment patterns and future market conditions provide the basis for the estimation along with similar risk characteristics and the Company's business strategy, which have not changed significantly over time. Changes in the allowance for CECL on premiums receivable are recorded through underwriting and general and administrative expenses. The table below shows the changes in CECL on premiums receivable. Years Ended December 31, 2024 2023 (in millions) Beginning balance of the allowance for CECL on premiums receivable $ 17.9 $ 12.8 Current period provision for CECL 23.9 17.3 Write-offs charged against the allowance (13.8) (3.9) Recoveries collected (8.8) (8.3) Ending balance of the allowance for CECL on premiums receivable $ 19.2 $ 17.9 Reinsurance Recoverables In assessing an allowance for reinsurance assets, which includes reinsurance recoverables and the Contingent Commission, the Company considers historical information, the financial strength ratings of reinsurers, and collateralization amounts, to determine the appropriateness of the allowance. Historically, the Company has not experienced a credit loss from reinsurance transactions. In assessing future default, the Company evaluated the CECL allowance under the ratings-based method using AM Best's Average Cumulative Net Impairment Rates. Reinsurer ratings are also assessed through this process. Changes in the allowance for CECL on reinsurance recoverables are recorded through underwriting and general and administrative expenses. The table below shows the changes in CECL on reinsurance recoverables. Years Ended December 31, 2024 2023 (in millions) Beginning balance of the allowance for CECL on reinsurance recoverables $ 0.9 $ 0.9 Current period provision for CECL — — Ending balance of the allowance for CECL on reinsurance recoverables $ 0.9 $ 0.9 Investments The Company assesses all AFS investments in an unrealized loss position for CECL. The Company first assesses whether it intends to sell, or it is more likely than not that it will be required to sell, the security before recovery of its amortized cost basis. If either of the criteria is met, the security's amortized cost basis is written down to its fair value. For AFS investments that do not meet either criteria, the Company evaluates whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and any adverse conditions specifically related to the security, among other factors. Any impairment that has not been recorded through an allowance for credit losses is recognized in Accumulated other comprehensive income or loss on the Company's Consolidated Balance Sheets. Changes in the allowance for CECL on investments are recorded as a Realized gain or loss on investments on the Company’s Consolidated Statements of Comprehensive Income (Loss). As of December 31, 2024, the Company established an aggregate allowance for CECL on investments in the amount of $1.1 million. For the Company’s investments in fixed maturity debt securities, the allowance for CECL was determined by: (i) observing the credit characteristics of those debt securities that may have demonstrated a credit loss as of that date and by comparing the present value of cash flows expected to be collected to its amortized cost basis; and (ii) observing the credit characteristics of those debt securities that are expected to demonstrate a credit loss in the future by comparing the present value of cash flows expected to be collected to its amortized cost basis. The expected present value of cash flows are calculated using scenario based credit loss models derived from the discounted cash flows under the Comprehensive Capital Analysis Review framework, which is adopted by the Federal Reserve. As of December 31, 2024, the Company did not intend to sell any of its AFS investments in which its amortized cost exceeded its fair value. Accrued interest receivable on AFS investments is excluded from the estimate of credit losses as these amounts have been consistently received on a timely basis. The table below shows the changes in the allowance for CECL on AFS investments. Years Ended December 31, 2024 2023 (in millions) Beginning balance of CECL on AFS investments $ 2.7 $ 4.5 Net change in CECL provision 0.4 (0.1) Reductions in allowance from disposals (2.0) (1.7) Ending balance of CECL on AFS investments $ 1.1 $ 2.7

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2024
Property and Equipment [Abstract]
Property, Plant and Equipment Disclosure	Property and Equipment Property and equipment consists of the following: As of December 31, 2024 2023 (in millions) Furniture and equipment $ 1.8 $ 1.8 Leasehold improvements 0.5 0.5 Computers and software 46.2 45.7 Automobiles 0.4 0.6 Property and equipment, gross 48.9 48.6 Accumulated depreciation (41.1) (42.1) Property and equipment, net $ 7.8 $ 6.5 Depreciation expenses related to property and equipment for the years ended December 31, 2024, 2023, and 2022 were $3.6 million, $4.8 million, and $5.3 million, respectively. Capitalized costs associated with internally developed software were $2.5 million and $1.8 million during the years ended December 31, 2024 and 2023, respectively. Cloud Computing Arrangements Capitalized costs associated with cloud computing arrangements totaled $17.3 million and $28.0 million as of December 31, 2024 and 2023, respectively, which were comprised of service contract fees and implementation costs associated with hosting arrangements. Total amortization for hosting arrangements for the years ended December 31, 2024 and 2023 was $13.1 million and $16.7 million, respectively. In 2023, the Company wrote-off $1.6 million of previously capitalized cloud computing costs associated with a policy management system as part of a continual evaluation of our ongoing technology initiatives, which is included in Other expenses on the Company's Consolidated Statements of Comprehensive Income (Loss).
Restructuring, Impairment, and Other Activities Disclosure	Lease Exit and Disposal Cost In 2023, the Company recorded a non-recurring charge in connection with the early termination of the lease associated with its former corporate headquarters in Reno, Nevada. This charge included a one-time lease termination payment of $7.6 million, a write-off related to remaining leasehold improvements and furniture and equipment of $2.6 million, and estimated miscellaneous expenses associated with exiting the property of $0.2 million. The Company also recognized a lease termination gain pertaining to the elimination of the lease liability net of the ROU asset of $1.0 million. These amounts are included in Other expenses on the Company's Consolidated Statements of Comprehensive Income (Loss). The decision to terminate this operating lease was undertaken as part of an ongoing review of the Company's future facility needs.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
Income Taxes [Abstract]
Income Taxes	Income Taxes The Company files a consolidated federal income tax return. The insurance subsidiaries pay premium taxes on premiums in lieu of some states' income or franchise taxes. Tax years 2021 through 2024 remain open and are available for examination by the Internal Revenue Service (IRS). The Company's provision for income taxes consisted of the following: Years Ended December 31, 2024 2023 2022 Current tax expense: (in millions) Federal $ 23.1 $ 23.7 $ 23.6 State 0.8 1.5 1.1 Total current tax expense 23.9 25.2 24.7 Total deferred federal tax expense 4.2 5.1 (17.3) Income tax expense $ 28.1 $ 30.3 $ 7.4 The differences in amounts and percentages between the statutory federal tax rate of 21% and the Company's effective tax rate on net income before income taxes as reflected in the Consolidated Statements of Comprehensive Income (Loss) were as follows: Years Ended December 31, 2024 2023 2022 (in millions) (percent) (in millions) (percent) (in millions) (percent) U.S. Federal statutory tax rate $ 30.8 21.0 % $ 31.2 21.0 % $ 11.7 21.0 % State income tax expense, net of federal income tax effect (1) 0.6 0.4 1.1 0.8 0.9 1.5 Tax credits (0.8) (0.5) (0.3) (0.2) (0.2) (0.4) Nontaxable or nondeductible items Tax-advantaged investment income (0.4) (0.3) (0.9) (0.6) (1.4) (2.5) LPT deferred gain amortization and LPT reserve adjustments (1.2) (0.8) (1.5) (1.0) (1.7) (3.1) IRC section 162(m), excessive employee remuneration 0.8 0.6 0.9 0.6 0.8 1.4 Tax benefit attributable to repeal of IRC section 847 — — — — (1.4) (2.5) Pre-Privatization loss and LAE reserve adjustments, excluding LPT (1.1) (0.8) (0.1) — (0.9) (1.7) Other (0.6) (0.4) (0.1) (0.2) (0.4) (0.4) Effective tax rate $ 28.1 19.2 % $ 30.3 20.4 % $ 7.4 13.3 % (1) Florida and Illinois make up the majority (greater than 50 percent) of the state income tax expense, net of federal income tax effect category. The LPT Reserve Adjustments for the years ended December 31, 2024 and 2023 decreased net income by $1.7 million, and $0.9 million, respectively, but did not affect taxable income. The LPT Contingent Commission adjustments increased net income by $0.4 million, and $0.3 million during 2024 and 2023, respectively, but did not increase taxable income. The significant components of deferred income taxes, net, were as follows as of December 31: 2024 2023 Deferred Tax Deferred Tax Assets Liabilities Assets Liabilities (in millions) Unrealized capital gains and losses, net $ — $ 4.3 $ 3.1 $ — Deferred policy acquisition costs — 12.7 — 11.9 Intangible assets — 1.6 — 1.6 Loss reserve discounting for income tax reporting 31.4 — 31.2 — Unearned premiums 15.8 — 14.9 — Allowance for bad debt 4.2 — 4.0 — Stock-based compensation 1.6 — 1.6 — Accrued liabilities 4.2 — 4.9 — Operating leases 0.9 0.8 1.2 1.1 Other 9.3 9.7 3.2 6.1 Total $ 67.4 $ 29.1 $ 64.1 $ 20.7 Deferred income tax asset, net $ 38.3 $ 43.4 Deferred tax assets are required to be reduced by a valuation allowance if it is more likely than not that all or some portion of the deferred tax asset will not be realized. Realization of the deferred income tax asset is dependent on the Company generating sufficient taxable income in future years as the deferred income tax charges become deductible for tax reporting purposes. Although realization is not assured, management believes that it is more likely than not that the net deferred income tax asset will be realized. For the years ended December 31, 2024 and 2023, respectively, the Company did not record a deferred tax asset valuation allowance. The Company recognizes accrued interest and penalties related to unrecognized tax benefits, if any, in income taxes. For the years ended December 31, 2024, 2023, and 2022, respectively, the Company incurred no material interest and penalties. All of the total amount of gross unrecognized tax benefits, if recognized, would impact the Company's effective tax rate. The changes in the balances of gross unrecognized tax benefits were as follows: Years Ended December 31, 2024 2023 2022 (in millions) Beginning balance of unrecognized tax benefits $ 0.6 $ 0.4 $ 0.3 Increases resulting from prior period tax provisions 0.4 — 0.1 Increases resulting from current period tax provisions 0.5 0.2 0.1 Decreases resulting from lapse of applicable statute of limitations (0.1) — (0.1) Ending balance of unrecognized tax benefits $ 1.4 $ 0.6 $ 0.4

Liability for Unpaid Losses and

Liability for Unpaid Losses and Loss Adjustment Expenses	12 Months Ended
	Dec. 31, 2024
Liability for Unpaid Losses and Loss Adjustment Expenses [Abstract]
Liability for Unpaid Losses and Loss Adjustment Expenses	Liability for Unpaid Losses and Loss Adjustment Expenses Accounting for workers' compensation insurance requires the Company to estimate the liability for the expected ultimate cost of unpaid losses and LAE (loss reserves) as of a balance sheet date. Loss reserve estimates are inherently uncertain because the ultimate amount the Company will pay for many of the claims it has incurred as of the balance sheet date will not be known for many years. The estimate of loss reserves is intended to equal the difference between the expected ultimate losses and LAE of all claims that have occurred as of a balance sheet date and amounts already paid. The Company establishes loss reserves based on its own analysis of emerging claims experience and environmental conditions in its markets and review of the results of various actuarial projections. The Company's aggregate carried reserve for unpaid losses and LAE is the sum of its reserves for each accident year and represents its best estimate of outstanding loss reserves. The amount by which estimated losses in the aggregate differ from those previously estimated for a specific time period is known as reserve development. Reserve development is unfavorable when losses ultimately settle for more than the amount estimated or subsequent estimates indicate a basis for reserve increases on open claims, causing the previously estimated loss reserves to be deficient. Reserve development is favorable when estimates of ultimate losses indicate a decrease in established reserves, causing the previously estimated loss reserves to be redundant. Development is reflected in the Company's operating results through an adjustment to incurred losses and LAE during the period in which it is recognized. Although claims for which reserves are established may not be paid for several years or more, the Company does not discount loss reserves in its financial statements for the time value of money, in accordance with GAAP. The three main components of reserves for unpaid losses and LAE are case reserves, incurred but not reported (IBNR) loss reserves, and LAE reserves. When claims are reported, the Company establishes individual estimates of the ultimate cost of each claim (case reserves). These case reserves are continually monitored and revised in response to new information and for amounts paid. In addition to case reserves, the Company establishes a provision for IBNR. IBNR is an actuarial estimate composed of the following: (i) future payments on claims that are incurred but have not yet been reported to the Company; (ii) a reserve for the additional development on claims that have been reported to the Company; and (iii) a provision for additional payments on closed claims that might reopen. IBNR reserves apply to the entire body of claims arising from a specific period, rather than a specific claim. Most of the Company's IBNR reserves relate to estimated future claim payments on recorded open claims. LAE reserves are the Company's estimate of the future expense to manage, investigate, administer, and settle claims that have occurred, and include legal expenses. LAE reserves are established in the aggregate, rather than on a claim-by-claim basis. LAE reserves are categorized between defense and cost containment (DCC), and adjusting and other (AO). A portion of the Company's obligations for losses and LAE are ceded to unaffiliated reinsurers. The amount of reinsurance that will be recoverable on losses and LAE reserves includes both the reinsurance recoverable from excess of loss reinsurance contracts, as well as reinsurance recoverable under the terms of the LPT Agreement. The Company uses actuarial methods to analyze and estimate the aggregate amount of unpaid losses and LAE. Management considers the results of various actuarial methods and their underlying assumptions, among other factors, in establishing reserves for unpaid losses and LAE. Judgment is required in the actuarial estimation of loss reserves, including the selection of various actuarial methodologies to project the ultimate cost of claims. Specifically, judgment is required in the following areas: the selection of parameters utilized in the various methodologies; the use of industry data and other benchmarks; and the weighting of differing reserve indications resulting from alternative methods and assumptions. The Company prepares reserve estimates for all accident years using our own historical claims data, industry data and many of the generally accepted actuarial methodologies for estimating loss reserves, such as paid loss development methods, incurred loss development methods, and Bornhuetter-Ferguson methods. These methods vary in their responsiveness to different information, characteristics, and dynamics in the data, and the results assist the actuary in considering these characteristics and dynamics in the historical data. The methods employed for each segment of claims data, and the relative weight accorded to each method, vary depending on the nature of the claims segment and on the age of the claims. Each actuarial methodology requires the selection and application of various parameters and assumptions. The key parameters and assumptions include the future payment and emergence patterns of our aggregate claims data; the magnitude and changes in claim settlement activity; the effects of legislative benefit changes and/or judicial decisions; and trends in the frequency and severity of claims. The following table represents a reconciliation of changes in the liability for unpaid losses and LAE. Years Ended December 31, 2024 2023 2022 (in millions) Unpaid losses and LAE at beginning of period $ 1,884.5 $ 1,960.7 $ 1,981.2 Less reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 428.4 445.4 476.9 Net unpaid losses and LAE at beginning of period 1,456.1 1,515.3 1,504.3 Losses and LAE, net of reinsurance, incurred during the period related to: Current year 480.2 457.8 432.8 Prior years (18.4) (44.9) (33.5) Total net losses and LAE incurred during the period 461.8 412.9 399.3 Paid losses and LAE, net of reinsurance, related to: Current year 127.1 111.7 92.5 Prior years 395.0 360.4 295.8 Total net paid losses and LAE during the period 522.1 472.1 388.3 Ending unpaid losses and LAE, net of reinsurance 1,395.8 1,456.1 1,515.3 Reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 412.4 428.4 445.4 Unpaid losses and LAE at end of period $ 1,808.2 $ 1,884.5 $ 1,960.7 Total net losses and LAE included in the above table excludes the impact of the amortization of the Deferred Gain and LPT Reserve adjustments (See Note 10). In 2024, the Company had $18.4 million of net favorable prior accident year loss reserve development, which included $17.9 million of favorable loss reserve development on the Company's voluntary business and $0.5 million on its assigned risk business. The net favorable loss development recognized in 2024 was primarily the result of overall favorable loss experience, including decreasing medical paid loss trends in California, partially offset by unfavorable prior year loss experience in accident years 2023 and 2021 associated with certain large claims. In 2023, the Company had $44.9 million of net favorable prior accident year loss reserve development, which included $44.6 million of favorable loss reserve development on the Company's voluntary business and $0.3 million on its assigned risk business. The net favorable loss development recognized in 2023 was primarily the result of decreasing medical paid loss trends in California related to accident years 2020 and prior, partially offset by reserve strengthening related to accident year 2021. The rapid economic rebound following the COVID-19 pandemic led to large premium and payroll increases related to accident year 2021 that were recognized through policy audits in subsequent years. In response, the Company strengthened its reserves for accident year 2021 to reflect the potential for higher losses arising from the higher than expected premium exposure. In 2022, the Company had $33.5 million of net favorable prior accident year loss reserve development, which included $32.1 million of favorable development on its voluntary business and $1.4 million on its assigned risk business. The net favorable loss development recognized in 2022 was primarily the result of decreasing medical and indemnity paid loss trends related to accident years 2020 and prior. The Company compiles and aggregates its claims data by grouping the claims according to the year in which the claim occurred (accident year) when analyzing claim payment and emergence patterns and trends over time. Reported claims include any claim that has case reserves and/or loss and LAE payments associated with them. The Company analyzed the usefulness of disaggregation of its results and determined the characteristics associated with the policies and the related unpaid loss reserves, incurred losses, and payment patterns are similar in nature. As such, the following tables show the Company's historical incurred and cumulative paid losses and LAE development, net of reinsurance, as well as IBNR loss reserves and the number of reported claims on an aggregated basis as of December 31, 2024 for each of the previous ten accident years. Incurred Losses and DCC, Net of Reinsurance Years Ended December 31, As of December 31, 2024 Accident Year 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 (1) 2020 (1) 2021 (1) 2022 (1) 2023 (1) 2024 IBNR Cumulative number of reported claims (in millions, except claims counts) 2015 $ 422.2 $ 425.8 $ 423.9 $ 419.6 $ 408.7 $ 396.7 $ 384.9 $ 381.9 $ 374.9 $ 370.4 $ 14.3 27,293 2016 419.0 414.6 395.4 375.0 364.6 354.8 350.4 347.1 342.4 16.2 25,833 2017 412.4 391.3 358.3 337.9 329.8 326.9 322.5 315.8 18.2 25,128 2018 422.5 424.6 407.7 400.6 400.5 400.5 400.8 22.8 28,028 2019 422.4 435.7 448.5 448.8 443.9 441.7 34.6 33,060 2020 365.7 374.0 373.3 366.9 364.4 27.0 24,320 2021 339.2 339.0 348.9 359.4 24.1 23,096 2022 399.3 400.7 400.7 48.0 23,559 2023 421.4 433.3 77.7 24,053 2024 442.3 188.6 21,615 Total $ 3,871.2 Cumulative Paid Losses and DCC, Net of Reinsurance Years Ended December 31, Accident Year 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 (1) 2020 (1) 2021 (1) 2022 (1) 2023 (1) 2024 (in millions) 2015 $ 65.5 $ 174.5 $ 246.9 $ 290.5 $ 311.2 $ 322.2 $ 329.3 $ 333.7 $ 337.6 $ 340.9 2016 65.6 166.8 227.7 261.2 278.3 290.0 298.1 302.3 309.2 2017 63.5 160.2 215.7 243.7 260.0 269.5 277.1 283.5 2018 77.9 189.9 254.2 293.6 315.2 340.1 352.3 2019 88.8 212.6 285.2 325.8 354.4 374.5 2020 71.9 175.6 233.5 274.3 299.6 2021 66.1 166.8 231.2 277.5 2022 76.5 203.7 279.0 2023 92.5 240.7 2024 106.9 Total $ 2,864.1 All outstanding liabilities for unpaid losses and DCC prior to 2015, net of reinsurance 321.9 Total outstanding liabilities for unpaid losses and DCC, net of reinsurance $ 1,329.0 (1) Data presented for these calendar years is required supplementary information, which is unaudited. The following table represents a reconciliation of claims development to the aggregate carrying amount of the liability for unpaid losses and LAE: December 31, 2024 (in millions) Liabilities for unpaid losses and LAE, net of reinsurance $ 1,329.0 Reinsurance recoverable, excluding CECL allowance, on unpaid losses 412.4 AO 66.8 Total liability for unpaid losses and LAE $ 1,808.2 The following table presents the average annual percentage payout of incurred claims by age, net of reinsurance, as of December 31, 2024 and is presented as required supplementary information, which is unaudited: Average Annual Percentage Payout of Claims by Age, Net of Reinsurance Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 19.9 % 29.8 % 17.5 % 10.5 % 5.8 % 4.0 % 2.4 % 1.5 % 1.6 % 0.9 %

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2024
Reinsurance [Abstract]
Reinsurance	Reinsurance The Company purchases reinsurance from third parties in the normal course of its business in order to manage its exposures. The Company's reinsurance coverage is provided on both a quota share and excess of loss basis. The effects of reinsurance on the Company's written and earned premiums and on its losses and LAE incurred were as follows: Years Ended December 31, 2024 2023 2022 Written Earned Written Earned Written Earned (in millions) Direct premiums $ 767.8 $ 747.8 $ 758.6 $ 719.9 $ 705.3 $ 673.2 Assumed premiums 8.5 8.5 9.1 9.1 8.9 9.0 Gross premiums 776.3 756.3 767.7 729.0 714.2 682.2 Ceded premiums (6.8) (6.8) (7.1) (7.1) (7.0) (7.0) Net premiums $ 769.5 $ 749.5 $ 760.6 $ 721.9 $ 707.2 $ 675.2 Ceded losses and LAE incurred $ 13.1 $ 17.0 $ 3.5 Ceded losses and LAE incurred includes the amortization of the Deferred Gain, LPT Reserve Adjustments, and LPT Contingent Commission adjustments. Excess of Loss Reinsurance The Company purchases reinsurance annually to protect it against the costs of severe claims and certain catastrophic events in its workers' compensation business. The reinsurance program consists of one treaty covering excess of loss and catastrophic loss events in four layers of coverage. The Company's reinsurance coverage for losses from a single occurrence or catastrophic event is $190.0 million in excess of a $10.0 million retention; including a maximum any one life limit of $20.0 million, subject to certain exclusions. The current reinsurance program is effective July 1, 2024 through June 30, 2025, and is highly consistent with annual programs that ended on June 30, 2023 and 2022. This reinsurance coverage includes coverage for pandemics and acts of terrorism, excluding nuclear, biological, chemical, and radiological events. Any liability outside the coverage limits of the reinsurance program is retained by the Company. LPT Agreement Amounts recoverable from reinsurers on unpaid losses and LAE were $411.5 million and $427.5 million at December 31, 2024 and 2023, respectively. At December 31, 2024 and 2023, $277.1 million and $291.7 million of those recoverables, respectively, were related to the LPT Agreement that was entered into in 1999 by the Fund and assumed by EICN. Under the LPT Agreement, substantially all of the Fund's losses and LAE on claims incurred prior to July 1, 1995 have been ceded to three unaffiliated reinsurers on a 100% quota share basis. Under the LPT Agreement, initially $1.5 billion in liabilities for the incurred but unpaid losses and LAE related to claims incurred prior to July 1, 1995, were reinsured for consideration of $775.0 million. The LPT Agreement provides coverage up to $2.0 billion. Through December 31, 2024, the Company had paid losses and LAE claims totaling $895.6 million related to the LPT Agreement. The Company amortized $5.2 million, $6.9 million, and $8.3 million of the Deferred Gain for the years ended December 31, 2024, 2023, and 2022, respectively. Additionally, through June 30, 2024 and for the year ended December 31, 2023, the Company recognized $0.4 million and $0.3 million of favorable LPT Contingent Commission adjustments, respectively (Note 2 –Reinsurance).

Financing Arrangements

Financing Arrangements	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Financing Arrangements	Financing Arrangements Credit Agreement On May 28, 2024, EHI entered into a Credit Agreement (the Credit Agreement) with Wells Fargo Bank National Association, as both administrative agent and issuing lender. The Credit Agreement provides for a $25.0 million, unsecured, three-year revolving credit facility and is guaranteed by certain of EHI's wholly owned subsidiaries, Employers Group, Inc. (EGI) and Cerity Group, Inc. (CGI). Borrowings under the Credit Agreement may be used for working capital and general corporate purposes of EHI and its subsidiaries. Pursuant to the terms of the Credit Agreement, EHI has an option to request an increase of the credit available under the facility up to a maximum facility amount of $35.0 million, subject to the consent of the lender(s) and the satisfaction of certain conditions. The interest rates applicable to loans under the Credit Agreement are generally based on either, at EHI's option: (i) a base rate, defined as the higher of the Prime Rate, the Federal Funds Rate plus 1.25% and the Adjusted Term Secured Overnight Financing Rate (SOFR) for a one-month tenor plus 1.75%, or (ii) an Adjusted Term SOFR Rate, defined as the applicable Adjusted Term SOFR Rate plus 1.75%. In addition, EHI is subject to a fee on the lender’s unused commitment, ranging from 0.30% to 0.55%. The applicable margin and the amount of such commitment fee vary based upon the financial strength rating of EHI’s insurance subsidiaries as most recently announced by AM Best or EHI’s debt to total capitalization ratio if such financial strength rating is not available. Total interest paid and/or fees incurred pursuant to the Credit Agreement was $0.1 million for the year ended December 31, 2024. The Credit Agreement contains covenants that require EHI and its consolidated subsidiaries to maintain: (i) a minimum consolidated net worth, defined as EHI’s total stockholders’ equity excluding any accumulated other comprehensive income or loss, of no less than $800.0 million; and (ii) a debt to total capitalization ratio of no more than 35%, in each case as determined in accordance with the Credit Agreement. As of December 31, 2024, EHI has remained in compliance with all of the covenants associated with the Credit Agreement. EHI incurred $0.2 million in debt issuance costs in connection with the Credit Agreement, which are being amortized over the three-year life in Interest and financing expenses on the Company's Consolidated Statements of Comprehensive Income (Loss). Advances can be repaid at any time without prepayment penalties or additional fees. EHI had no borrowings under the Credit Agreement during the year ended December 31, 2024. On January 8, 2025, AM Best upgraded the financial strength ratings of EHI’s insurance subsidiaries to “A” (Excellent). As a result of this ratings action, and effective as of that date: (i) the applicable margin with respect to SOFR loans was reduced from 1.75% to 1.50%; (ii) the applicable margin with respect to base rate loans was reduced from 0.75% to 0.50%; and (iii) the annual commitment fee on the unused portion of the facility was reduced from 0.35% to 0.30%. Former Credit Agreement On December 15, 2020, EHI entered into a Credit Agreement (the former Credit Agreement) with a syndicate of financial institutions. The former Credit Agreement provided for a $75.0 million three-year revolving credit facility and was guaranteed by EHI’s wholly owned subsidiaries, EGI and CGI. Borrowings under the former Credit Agreement could be used for working capital and general corporate purposes of EHI and its subsidiaries. The interest rates applicable to loans made under the former Credit Agreement were generally based on, at EHI's option, a base rate plus a specified margin, ranging from 0.25% to 1.25%, or the Adjusted Term SOFR rate plus a specified margin, ranging from 1.25% to 2.25%. In addition, EHI paid a fee on each lender’s unused commitment, ranging from 0.20% to 0.50%. Interest paid and/or fees incurred pursuant to the former Credit Agreement during the years ended December 31, 2023 and 2022 was $0.5 million and $0.3 million, respectively. The former Credit Agreement contained covenants that required EHI and its consolidated subsidiaries to maintain: (i) a minimum consolidated net worth; and (ii) a debt to total capitalization ratio of no more than 35%. EHI remained in compliance with all of the covenants associated with the former Credit Agreement from its inception to its expiration on December 15, 2023. EHI borrowed and subsequently repaid $10.0 million under the former Credit Agreement during the year ended December 31, 2022 and had no borrowings during the year ended December 31, 2023. FHLB Each of the Company's insurance subsidiaries are members of the FHLB. Membership allows the insurance subsidiaries access to collateralized advances, which may be used to support and enhance liquidity management. The amount of advances that may be taken is dependent on statutory admitted assets on a per company basis. During 2022, the Company's insurance subsidiaries, with the exception of CIC, had received aggregate advances of $182.5 million under the FHLB Standard Credit Program. These advances could be repaid at any time without penalty and were collateralized by eligible investment securities. The proceeds from these advances were used to purchase an equivalent amount of high-quality collateralized loan obligation securities. The Company's weighted average annual interest rate on these advances was 5.11% for 2023 and 2.65% for 2022. Interest incurred and paid during the year ended December 31, 2023 each totaled $5.3 million, and in 2022 totaled $3.0 million and $2.3 million, respectively. In 2023, the Company's insurance subsidiaries repaid all of its advances under the FHLB Standard Credit Program. FHLB membership also allows the Company's insurance subsidiaries access to standby letters of credit (Letter of Credit Agreements). Throughout 2022 and 2023, EAC, ECIC, and EPIC had $25.0 million, $35.0 million, and $10.0 million of Letter of Credit Agreements in effect, respectively. On October 9, 2024, EPIC amended its existing Letter of Credit Agreement to increase its capacity to $110.0 million. The Letter of Credit Agreements currently in effect expire on March 31, 2025, and will remain evergreen with automatic one-year extensions unless the FHLB notifies the beneficiary at least 60 days prior to the then applicable expiration date of its election not to renew. The Letter of Credit Agreements may only be used to satisfy, in whole or in part, insurance deposit requirements with the State of California and are fully secured with eligible collateral at all times. The Letter of Credit Agreements are subject to annual maintenance charges and a fee of 15 basis points on issued amounts. As of December 31, 2024 and 2023 letters of credit totaling $170.0 million and $70.0 million, respectively, were issued in lieu of securities on deposit with the State of California under these Letter of Credit Agreements. As of December 31, 2024 and 2023, investment securities having a fair value of $284.7 million and $286.4 million, respectively, were pledged to the FHLB by the Company's insurance subsidiaries in support of the collateralized advance facility and the Letter of Credit Agreements.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies [Abstract]
Commitments and Contingencies Disclosure	Commitments and Contingencies Leases At December 31, 2024, the Company's operating leases have remaining terms of one Components of lease expense were as follows: Years Ended December 31, 2024 2023 (in millions) Operating lease expense $ 1.1 $ 1.6 Finance lease expense 0.1 0.2 Total lease expense $ 1.2 $ 1.8 As of December 31, 2024, the weighted average remaining lease terms for operating and financing leases were 3.2 years and 1.2 years, respectively, and the associated weighted average discount rates were 1.3% and 7.3%, respectively. Maturities of lease liabilities were as follows: Year Operating Leases Finance Leases (in millions) 2025 $ 1.5 $ 0.1 2026 1.2 — 2027 1.2 — 2028 0.4 — 2029 — — Thereafter — — Total lease payments 4.3 0.1 Less: imputed interest (0.1) — Total $ 4.2 $ 0.1 Supplemental balance sheet information related to leases was as follows: As of December 31, 2024 2023 (in millions) Operating leases: Operating lease right-of-use asset $ 3.7 5.1 Operating lease liability 4.2 5.9 Finance leases: Property and equipment, gross 0.4 0.6 Accumulated depreciation (0.3) (0.4) Property and equipment, net 0.1 0.2 Other liabilities $ 0.1 $ 0.2 Supplemental cash flow information related to leases was as follows: Years Ended December 31, 2024 2023 (in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 1.1 $ 1.6 Financing cash flows used for finance leases 0.1 0.2 Lease Exit and Disposal Costs During the year ended December 31, 2023, the Company recorded a non-recurring charge in connection with the early termination of the lease associated with its former corporate headquarters in Reno, Nevada. This charge included a one-time lease termination payment of $7.6 million, a write-off related to remaining leasehold improvements and furniture and equipment of $2.6 million, and estimated miscellaneous expenses associated with exiting the property of $0.2 million. The Company also recognized a related lease termination gain pertaining to the elimination of the lease liability net of the ROU asset of $1.0 million, which amount is included in Other expenses on the Company’s Consolidated Statements of Comprehensive Income (Loss). The decision to terminate the former Reno operating lease was undertaken as part of an ongoing review of the Company's current and future facility needs. Contingencies Surrounding Insurance Assessments Each of the states where the Company's insurance subsidiaries are licensed to transact business require property and casualty insurers that write business within the respective state to pay various insurance assessments. The Company accrues a liability for estimated insurance assessments as direct premiums are written, losses are recorded, or as other events occur, depending on the relevant laws and regulations of a particular state. The Company defers such costs to the extent they are associated with unearned premium and recognizes them as an expense as such premiums are earned. The Company had an accrued liability for guaranty fund assessments, second injury funds assessments, and other insurance assessments totaling $12.2 million and $13.0 million as of December 31, 2024 and 2023, respectively. These liabilities are generally expected to be paid over periods from less than one year to, in some instances, the duration of the outstanding claims, based on individual state's laws and regulations. The Company also recorded an asset of $11.2 million and $12.5 million as of December 31, 2024 and 2023, respectively, for remitted estimated policy charges anticipated to be recouped from policyholders. This asset also includes state assessments that may be recovered through a reduction in future premium taxes. These assets are expected to be realized over one to ten year periods in accordance with their type and each individual state's laws and regulations. Unfunded Investment Commitments As of December 31, 2024 and 2023, the Company had unfunded commitments to invest $15.6 million and $25.4 million, respectively, into private equity limited partnerships. See Note 4.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2024
Equity, Attributable to Parent [Abstract]
Treasury Stock	Stockholders' Equity Stock Repurchase Programs On July 26, 2023, the Board authorized a stock repurchase authorization for up to $50.0 million of repurchases of our common stock from July 31, 2023 through December 31, 2024 (the 2023 Program). On June 10, 2024, the Board authorized a $50.0 million addition to the 2023 Program, increasing our aggregate purchase authority to $100.0 million, and extended the repurchase authority pursuant to the 2023 Program through July 31, 2025. The 2023 Program replaced its former program that expired on December 31, 2023. The 2023 Program provides that shares may be purchased in the open market and/or in privately negotiated transactions from time to time, and that all purchases shall be made in compliance with all applicable provisions of the Nevada Revised Statutes and federal and state securities laws including, Rules 10b5-1 and 10b-18 of the Exchange Act, as amended. Through December 31, 2024, the Company has repurchased a total of 1,694,483 shares of common stock at an average price of $41.58 per share, including commissions, for a total of $70.5 million under the 2023 Program. Since the Company's initial public offering in January 2007 through December 31, 2024, the Company has repurchased a total of 33,628,155 shares of common stock at an average cost per share of $22.17 through various stock repurchase programs, which is reported as treasury stock, at cost, on its Consolidated Balance Sheets. The Inflation Reduction Act of 2022 added a new IRC section, Section 4501, that imposes a 1% excise tax on certain stock repurchases on publicly traded companies occurring after December 31, 2022. The Company's excise tax obligation is $0.3 million and $0.7 million at December 31, 2024 and 2023, respectively, which is included in treasury stock, on its Consolidated Balance Sheets.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2024
Stock-Based Compensation [Abstract]
Stock-Based Compensation Disclosure	Stock-Based Compensation On May 28, 2020, the Company’s stockholders approved the Employers Holdings, Inc. Amended and Restated Equity and Incentive Plan (as amended and restated, the Plan). The Plan will expire on the tenth anniversary of April 1, 2020, which is also the effective date of the Plan . The Plan is administered by the Human Capital Management and Compensation Committee of the Board (Compensation Committee), which is authorized to grant, at its discretion, awards to officers, employees, non-employee directors, consultants, and independent contractors. The maximum number of common shares reserved for grants of awards under the Plan was 6,555,000 shares, prior to reductions for grants made. The Plan provides for the grant of stock options (both incentive stock options and nonqualified stock options), stock appreciation rights, shares of restricted stock, restricted stock units (RSUs), performance stock units (PSUs), and other stock-based awards. Employees that are awarded RSUs and PSUs are entitled to receive dividend equivalents for eligible awards, payable in cash, when and if, the underlying award vests and becomes payable. If the underlying award does not vest or is forfeited, dividend equivalents with respect to the underlying award fail to become payable and are forfeited. As of December 31, 2024, the only stock based incentive awards outstanding under the Plan were RSUs and PSUs. Compensation costs are recognized based on actual or expected performance, if applicable, net of any estimated forfeitures on a straight-line basis over the requisite employee service periods. Forfeiture rates are based on historical experience and are adjusted in subsequent periods for differences in actual forfeitures from those estimated. The Company’s forfeiture assumptions serve to reduce the unamortized grant date fair value of outstanding awards as well as the associated stock-based compensation expense. As awards are actually forfeited, the number of awards outstanding is reduced and the remaining unamortized grant date fair value is compared to assumed forfeiture levels. True-up adjustments are made as deemed necessary. For the years presented, the Company assumed a zero to 15% forfeiture rate on RSU and PSU awards. Net stock-based compensation expense recognized in the Company's Consolidated Statements of Comprehensive Income (Loss) was as follows: Years Ended December 31, 2024 2023 2022 Stock-based compensation expense related to: (in millions) RSUs 3.2 3.5 2.6 PSUs 3.0 2.6 2.3 Total 6.2 6.1 4.9 Less: related tax benefit 1.3 1.3 1.0 Net stock-based compensation expense $ 4.9 $ 4.8 $ 3.9 Stock Options No stock options were granted in 2024, 2023 or 2022, and no stock options were outstanding or exercisable at each of the years ended December 31, 2024 and 2023. Changes in outstanding stock options as of December 31, were as follows: Number of Stock Options Weighted-Average Price Weighted Average Remaining Contractual Life Stock options outstanding at January 1, 2022 65,165 $ 25.96 0.7 years Exercised (41,665) 24.97 Stock options outstanding at December 31, 2022 23,500 27.72 0.2 years Exercised (23,500) 27.72 Stock options outstanding at December 31, 2023 — — 0.0 years The fair value of stock options vested and the intrinsic value of outstanding and exercisable stock options as of December 31, were as follows: 2024 2023 2022 (in millions) Intrinsic value of outstanding stock options — — 0.4 Intrinsic value of exercisable stock options — — 0.4 The intrinsic value of stock options exercised was $0.4 million and $0.7 million for the years ended December 31, 2023 and 2022, respectively. RSUs The Company has awarded RSUs to non-employee members of the Board and certain employees of the Company. The RSUs awarded to non-employee members of the Board generally vest on the first anniversary of the award date. RSU grants allow each non-employee Director to decide whether to defer settlement of the RSUs until six months after termination of Board service or settle the RSUs at vesting. Dividend equivalents are granted to Directors who elected to defer settlement of the RSUs after the grants have vested. The RSUs awarded to employees of the Company typically have a service vesting period of four years from the date awarded and vest 25% on or after each of the subsequent four anniversaries of such date. All RSUs are subject to accelerated vesting in certain limited circumstances, such as: retirement, death or disability of the holder, or in connection with a change of control of the Company. Changes in outstanding RSUs as of December 31, were as follows: Number of RSUs Weighted Average Grant Date Fair Value RSUs outstanding at January 1, 2022 198,126 $ 34.53 Granted 124,042 39.90 Forfeited (13,728) 38.45 Vested (51,127) 37.69 RSUs outstanding at December 31, 2022 257,313 36.28 Granted 112,114 40.05 Forfeited (27,447) 40.06 Vested (111,158) 33.83 RSUs outstanding at December 31, 2023 230,822 38.84 Granted 89,783 45.33 Forfeited (18,251) 42.16 Vested (88,062) 38.59 RSUs outstanding at December 31, 2024 214,292 41.40 Vested but unsettled RSUs at December 31, 2024 31,553 35.46 At December 31, 2024, the Company had yet to recognize $5.4 million of expense related to outstanding RSUs and expects to recognize the remaining expense on a straight-line basis over the next 39 months. The grant date fair value of RSUs vested and the intrinsic value of vested RSUs for the years ended December 31, were as follows: 2024 2023 2022 (in millions) Grant date fair value of RSUs vested $ 3.4 $ 3.8 $ 1.9 Intrinsic value of RSUs vested 4.0 4.4 2.1 The intrinsic value of outstanding RSUs was $11.0 million, $9.1 million, and $11.1 million at December 31, 2024, 2023, and 2022, respectively. PSUs The Company has awarded PSUs to certain employees of the Company as follows: Date of Grant Target Number Awarded Fair Value on Date of Grant Aggregate Fair Value on Date of Grant (in millions) March 2022 (1) 73,120 40.54 3.0 March 2023 (2) 81,800 41.14 3.4 April 2023 (2) 1,220 42.34 0.1 February 2024 (2) 77,360 46.36 3.6 (1) The PSUs awarded in March 2022, had a performance period of two years, followed by an additional one year vesting period. These awards were subject to certain performance goals with payouts that ranged from 0% to 250% of the target awards. The actual performance goal achieved was determined to be 59% of target in February 2024. The values shown in the table represent the aggregate number of PSUs that were originally awarded at the target level. (2) The PSUs awarded in March 2023, April 2023, and February 2024 have a performance period of three years. These PSU awards are subject to certain performance goals with payouts that range from 0% to 250% of the target awards. The values shown in the table represent the aggregate number of PSUs awarded at the target level. At December 31, 2024, the Company had yet to recognize $4.3 million of expense related to the 2023 and 2024 PSU grants and expects to recognize the remaining expense associated with the 2023 PSU grants on a straight-line basis over the next 12 months and the 2024 PSU grants on a straight-line basis over the next 24 months. This is based on the expectation of the Company achieving a 130% of target rate for the 2023 PSUs, and a 100% of target rate for the 2024 PSUs.

Statutory Matters

Statutory Matters	12 Months Ended
	Dec. 31, 2024
Stautory Matters [Abstract]
Statutory Financial Data Disclosure	Statutory Matters Statutory Financial Data The combined capital stock, surplus, and net income of the Company's insurance subsidiaries (EICN, ECIC, EPIC, EAC, and CIC), prepared in accordance with the statutory accounting practices (SAP) of the National Association of Insurance Commissioners (NAIC) as well as SAP permitted by the states of California, Florida, Nevada, and New York were as follows: December 31, 2024 2023 (in millions) Capital stock and unassigned surplus $ 776.7 $ 739.7 Paid in capital 243.2 243.2 Total statutory surplus $ 1,019.9 $ 982.9 Net income provided from the Company's insurance subsidiaries prepared in accordance with SAP was $92.1 million, $96.2 million, and $105.1 million, for the years ended December 31, 2024, 2023, and 2022, respectively. Treatment of the LPT Agreement, deferred policy acquisition costs, and fair value of financial instruments (see Notes 4 and 10) are the primary differences in the SAP-basis capital stock and total surplus of the insurance subsidiaries of $1,019.9 million and $982.9 million, and the GAAP-basis equity of the Company of $1,068.7 million and $1,013.9 million as of December 31, 2024 and 2023, respectively. Under SAP accounting, the retroactive reinsurance gain resulting from the LPT Agreement is recorded as a special component of surplus (special surplus funds) in the initial year of the contract, and not reported as unassigned surplus until the Company has recovered amounts in excess of the original consideration paid. The special surplus funds are also reduced by the amount of extraordinary dividends as approved by the Nevada Division of Insurance. Under SAP, changes to the estimated contingent profit commission under the LPT Agreement was reflected in commission expense through June 30, 2024 when the final payment was determined. Insurance Company Dividends and Regulatory Requirements and Restrictions The ability of EHI to pay dividends on the Company's common stock and to pay other expenses will be dependent to a significant extent upon the ability of the Nevada domiciled insurance company, EICN, the California domiciled insurance company, ECIC, the Florida domiciled insurance companies, EPIC and EAC, to pay dividends to their immediate holding company, Employers Group, Inc. (EGI) and the New York domiciled insurance company, CIC, to pay dividends to its immediate holding company Cerity Group, Inc. (CGI), and in turn, the ability of EGI and CGI to pay dividends to EHI. The amount of dividends each of the Company's insurance subsidiaries may pay to their immediate parent is limited by the laws of its respective state of domicile. Nevada law limits the payment of cash dividends by EICN to its parent by providing that payments cannot be made except from available and accumulated surplus, otherwise unrestricted (unassigned), and derived from realized net operating profits and realized and unrealized capital gains. A stock dividend may be paid out of any available surplus. A cash or stock dividend prohibited by these restrictions may only be declared and distributed as an extraordinary dividend upon the prior approval of the Nevada Commissioner of Insurance (Nevada Commissioner). EICN may not pay such an extraordinary dividend or make an extraordinary distribution until the Nevada Commissioner either approves or does not disapprove the payment within 30 days after receiving notice of its declaration. An extraordinary dividend or distribution is defined by statute to include any dividend or distribution of cash or property whose fair market value, together with that of other dividends or distributions made within the preceding 12 months, exceeds the lesser of: (a) 10% of EICN's statutory surplus as regards to policyholders at the preceding December 31; or (b) EICN's statutory net income, not including realized capital gains, for the 12-month period ending at the preceding December 31. As of December 31, 2024, EICN had positive unassigned surplus of $259.1 million. During 2024, EICN paid an ordinary dividend in the amount of $13.7 million to its parent company, EGI. As a result of that payment, EICN cannot pay any dividends through March 26, 2025, and can pay $14.0 million of dividends thereafter, without regulatory approval. Under Florida law, without regulatory approval, EPIC and EAC may pay dividends if they do not exceed the greater of: the lesser of 10% of surplus or net income, not including realized capital gains, plus a 2-year carry forward; 10% of surplus, with dividends payable limited to unassigned funds minus 25% of unrealized capital gains; or, the lesser of 10% of surplus or net investment income plus a 3-year carry forward with dividends payable limited to unassigned funds minus 25% of unrealized capital gains. During 2024, EAC paid an ordinary dividend in the amount of $22.4 million to its parent company, EGI. As a result of that payment, EAC cannot pay any dividends through July 15, 2025 and $23.6 million thereafter, without regulatory approval from the Florida Office of Insurance Regulation (FOIR), provided that no dividends are paid prior to July 15, 2025. During 2024, EPIC paid an ordinary dividend in the amount of $23.2 million to its parent company, EGI. As a result of that payment, EPIC cannot pay any dividends through July 15, 2025 and can pay $23.9 million of dividends thereafter, without regulatory approval from the FOIR. EPIC and EAC are subject to regulation by the Florida Department of Financial Services (FDFS). Florida statute Section 624.408 requires EPIC and EAC to maintain minimum capital and surplus of the greater of $4.0 million or 10% of total liabilities. Florida statutes require EPIC and EAC to maintain a ratio of written premiums, defined as 1.25 times written premiums, to surplus of no greater than 10-to-1 for gross written premiums and 4-to-1 for net written premiums. During the years ended December 31, 2024, 2023, and 2022, EPIC and EAC were in compliance with these statutes. ECIC is subject to regulation by the California Department of Insurance (California DOI). Additionally, the California Insurance Holding Company System Regulatory Act limits the ability of ECIC to pay dividends to its parent. California law provides that, absent prior approval of the California Insurance Commissioner, dividends may only be declared from earned surplus. For purpose of this statute, earned surplus excludes amounts derived from net appreciation in the value of assets not yet realized, or derived from an exchange of assets, unless the assets received are currently realizable in cash. In addition, California law provides that the appropriate insurance regulatory authorities in the state of California must approve (or, within a 30-day notice period, not disapprove) any dividend that, together with all other such dividends paid during the preceding 12 months, exceeds the greater of: (i) 10% of the paying company's statutory surplus as regards to policyholders at the preceding December 31; or (ii) 100% of net income for the preceding year. During the years ended December 31, 2024, 2023, and 2022, ECIC was in compliance with these requirements. During 2024, ECIC paid an ordinary dividend in the amount of $23.3 million to its parent company, EGI. As a result of that payment, ECIC cannot pay any dividends until March 18, 2025 and can pay $23.5 million thereafter without prior regulatory approval. Under New York law, without regulatory approval, CIC may pay dividends if they do not exceed the lesser of 10% of surplus or 100% of net investment income for the previous year increased by the excess, if any, of net investment income over dividends declared or distributed during the period commencing 36 months prior to the declaration or distribution of the current dividend and ending 12 months prior thereto. The New York state law also provides that any distribution may only be paid out of earned surplus. During 2024, CIC paid an ordinary dividend in the amount of $5.7 million to its parent company, CSI. As a result of that payment, CIC cannot pay any dividends through September 20, 2025, and can pay $5.9 million of dividends thereafter, without regulatory approval. Additionally, EICN, ECIC, EPIC, EAC, and CIC are required to comply with RBC requirements. RBC is a method of measuring the amount of capital appropriate for an insurance company to support its overall business operations in light of its size and risk profile. NAIC RBC standards are used by regulators to determine appropriate regulatory actions relating to insurers that show signs of weak or deteriorating conditions. As of December 31, 2024, 2023, and 2022, EICN, ECIC, EPIC, EAC, and CIC each had total adjusted capital above all regulatory action levels.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income, Net	12 Months Ended
	Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income, Net	Accumulated Other Comprehensive Loss Accumulated other comprehensive loss is comprised of unrealized gains on investments classified as available-for-sale, net of deferred tax expense. The following table summarizes the components of Accumulated other comprehensive loss: Years Ended December 31, 2024 2023 (in millions) Net unrealized losses on investments, before taxes $ (104.5) $ (108.9) Deferred tax benefit on net unrealized losses 22.0 22.9 Total accumulated other comprehensive loss $ (82.5) $ (86.0)

Employee Benefit and Retirement

Employee Benefit and Retirement Plans	12 Months Ended
	Dec. 31, 2024
Employee Benefit and Retirement Plans [Abstract]
Compensation and Employee Benefit Plans	Employee Benefit and Retirement Plans The Company maintains a 401(k) defined contribution plan covering all eligible Company employees (the Employers 401(k) Plan). Under the Employers 401(k) Plan, the Company's safe harbor matching consists of a 100% matching contribution on salary deferrals up to 3% of compensation and then a 50% matching contribution on salary deferrals from 3% to 5% of compensation. The Company's matching contribution to the Employers 401(k) Plan was $2.5 million, $2.3 million, and $2.0 million for the years ended December 31, 2024, 2023, and 2022, respectively.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Common Share Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilutive impact of all common stock equivalents on earnings per share. Diluted earnings per share includes common shares assumed issued under the "treasury stock method," which reflects the potential dilution that would occur if outstanding RSUs and PSUs vested. Employees that are awarded RSUs and PSUs are entitled to receive dividend equivalents for eligible awards, payable in cash, when and if, the underlying award vests and becomes payable. Therefore, these awards are not considered participating securities for the purposes of determining earnings per share. The following table presents the net income and the weighted average number of shares outstanding used in the earnings per common share calculations. Years Ended December 31, 2024 2023 2022 (in millions, except share data) Net income $ 118.6 $ 118.1 $ 48.4 Weighted average number of shares outstanding–basic 25,050,605 26,368,801 27,503,941 Effect of dilutive securities: Stock options — 2,072 11,256 PSUs 86,920 110,342 131,465 RSUs 57,289 42,436 34,326 Dilutive potential shares 144,209 154,850 177,047 Weighted average number of shares outstanding–diluted 25,194,814 26,523,651 27,680,988 Diluted earnings per share excludes outstanding potential dilutive shares in periods where the inclusion of such securities would be anti-dilutive under the treasury stock methodology. Potential dilutive shares of 20,518 and 22,395 for the years ended December 31, 2024 and 2023, respectively, were excluded from the Company's diluted earnings per share computations because they were anti-dilutive. There were no potential dilutive shares excluded from the Company's diluted earnings per share computations for the year ended December 31, 2022. No outstanding PSUs and RSUs are considered in the Company's diluted earnings per share computations in any period that involves a net loss because their inclusion would be anti-dilutive.

Segments

Segments	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	Segment Reporting The Company operates as a single reportable segment, Insurance Operations, providing workers' compensation insurance through its wholly owned subsidiaries. In 2023, the Company developed and executed an integration plan to consolidate its previously segregated direct-to-consumer operations (Cerity) into the Company’s mainstream operations, while retaining its digital distribution capabilities. The integration plan, which provided efficiencies and cost savings, resulted in a change in the composition of our reportable segments by eliminating any distinction for reporting purposes, including stand-alone financial statements, among our former reportable segments, which were: Employers and Cerity. The Insurance Operations segment represents the Company's traditional business offered through its agents, including business originated from its strategic partnerships and alliances and its direct-to-customer business. Revenues for the Insurance Operations segment are generated primarily from earned workers' compensation premiums, investment income and realized and unrealized gains (losses) on investments. The Company does not have intra-entity sales or transfers. The Company considers an operating segment to be any component of its business whose operating results are regularly reviewed by the CODM (the President and Chief Executive Officer) to make key decisions about resources to be allocated and to assesses its performance. Performance is determined based on multiple measures, including net income, the Company’s combined ratio and the Company’s adjusted stockholders' equity. Net income, which is reported on the Company's Consolidated Statements of Comprehensive Income (Loss), is a comprehensive measure used to determine the Company’s overall profitability. The combined ratio, which is a widely-used measure used in the property and casualty insurance industry, is used to determine whether the Company is generating an underwriting profit or loss. Adjusted stockholders' equity, which is a non-GAAP measure of financial strength and overall performance, and is defined as [Total stockholders' equity plus Deferred reinsurance gain - LPT Agreement less Accumulated other comprehensive income or loss, net of tax] divided by ending common shares outstanding. The measurement of segment assets is reported on the Company's Consolidated Balance Sheet as Total assets. The accounting policies of the Insurance Operations segment are the same as those described in the summary of significant accounting policies (see Note 2). Under ASU 2023-07, the Company is required to disclose segment reporting requirements even as a single reportable segment, which includes additional disclosures regarding profit and loss information, as well as a further breakdown of significant expenses. The following table summarizes the Company's written premiums, components of net income, and significant segment expenses. Certain information presented below has been recast to conform to the 2024 presentation. Insurance Operations Total (in millions) Year Ended December 31, 2024 Gross premiums written $ 776.3 $ 776.3 Net premiums written $ 769.5 $ 769.5 Net premiums earned $ 749.5 $ 749.5 Net investment income 107.0 107.0 Net realized and unrealized gains on investments 24.1 24.1 Other income 0.1 0.1 Total revenues 880.7 880.7 Losses and loss adjustment expenses 456.2 456.2 Commission expense 101.2 101.2 Compensation-related expenses (1) 108.9 108.9 Information technology expenses (1) 12.0 12.0 Professional fees (1) 19.3 19.3 Depreciation and amortization expenses (1) 16.7 16.7 Other underwriting and general and administrative expenses (1) (2) 9.4 9.4 AO and other expense allocations (3) (48.0) (48.0) Premium taxes and assessments 29.5 29.5 Policyholder dividends 11.2 11.2 Bad debt expense 17.5 17.5 Interest and financing expenses 0.1 0.1 Total expenses $ 734.0 $ 734.0 Net income before income taxes 146.7 146.7 Income tax expense 28.1 28.1 Net income (4) $ 118.6 $ 118.6 Combined ratio 98.7 % 98.7 % Insurance Operations Total (in millions) Year Ended December 31, 2023 Gross premiums written $ 767.7 $ 767.7 Net premiums written $ 760.6 $ 760.6 Net premiums earned $ 721.9 $ 721.9 Net investment income 106.5 106.5 Net realized and unrealized gains on investments 22.7 22.7 Other (loss) income (0.2) (0.2) Total revenues 850.9 850.9 Losses and loss adjustment expenses 405.7 405.7 Commission expense 100.0 100.0 Compensation-related expenses (1) 109.2 109.2 Information technology expenses (1) 12.8 12.8 Professional fees (1) 22.1 22.1 Depreciation and amortization expenses (1) 21.5 21.5 Other underwriting and general and administrative expenses (1) (2) 12.6 12.6 AO and other expense allocations (3) (46.5) (46.5) Premium taxes and assessments 27.9 27.9 Policyholder dividends 10.3 10.3 Bad debt expense 10.1 10.1 Interest and financing expenses 5.8 5.8 Other expenses 11.0 11.0 Total expenses $ 702.5 $ 702.5 Net income before income taxes 148.4 148.4 Income tax expense 30.3 30.3 Net income (4) $ 118.1 $ 118.1 Combined ratio 96.0 % 96.0 % Insurance Operations Total (in millions) Year Ended December 31, 2022 Gross premiums written $ 714.2 $ 714.2 Net premiums written $ 707.2 $ 707.2 Net premiums earned $ 675.2 $ 675.2 Net investment income 89.8 89.8 Net realized and unrealized (losses) on investments (51.8) (51.8) Other income 0.3 0.3 Total revenues 713.5 713.5 Losses and loss adjustment expenses 391.0 391.0 Commission expense 95.9 95.9 Compensation-related expenses (1) 96.6 96.6 Information technology expenses (1) 12.5 12.5 Professional fees (1) 18.2 18.2 Depreciation and amortization expenses (1) 21.7 21.7 Other underwriting and general and administrative expenses (1) (2) 14.0 14.0 AO and other expense allocations (3) (38.8) (38.8) Premium taxes and assessments 28.4 28.4 Policyholder dividends 7.7 7.7 Bad debt expense 7.0 7.0 Interest and financing expenses 3.5 3.5 Total expenses $ 657.7 $ 657.7 Net income before income taxes 55.8 55.8 Income tax expense 7.4 7.4 Net income (4) $ 48.4 $ 48.4 Combined ratio 98.1 % 98.1 % (1) Certain underwriting and general and administrative expenses are shown prior to adjusting and other (AO) and other expense allocations. (2) Other underwriting and general and administrative segment expenses include marketing and advertising, travel, corporate insurance, payment processing fees and other miscellaneous expenses. (3) AO allocations consist of those underwriting and general and administrative expenses that relate to claims handling activities, which are allocated to loss adjustment expenses. Other allocations consist primarily of those underwriting and general and administrative expenses that relate to investing activities, which are allocated to net investment income, and nurse billing expenses that constitute defense and cost containment (DCC) costs, which are allocated to loss adjustment expenses. (4) There are no reconciling adjustments to consolidated net income. Entity-Wide Disclosures The Company operates solely within the United States and does not have revenue from transactions with a single policyholder accounting for 10% or more of its revenues. The following table shows our in-force premiums, in-force premiums including estimated final audit premium, and number of policies in-force for each state of our largest states and all other states combined as of December 31: 2024 2023 2022 State In-force Premiums Policies In-force Premiums Policies In-force Premiums Policies (dollars in millions) California $ 336.1 44,540 $ 311.5 43,353 $ 279.7 42,876 Florida 60.1 10,943 56.6 10,008 49.4 9,417 New York 36.1 7,938 31.9 7,603 27.3 7,497 Other (43 states and D.C.) 309.8 67,346 294.6 65,445 266.1 61,566 Total $ 742.1 130,767 $ 694.6 126,409 $ 622.5 121,356 Estimated audit premium 26.1 — 14.8 — 31.5 — Total, including estimated audit premium $ 768.2 130,767 $ 709.4 126,409 $ 654.0 121,356

Schedule II. Condensed Financia

Schedule II. Condensed Financial Information of Registrant	12 Months Ended
	Dec. 31, 2024
Notes to Condensed Financial Statments [Abstract]
Schedule II. Condensed Financial Information of Registrant	Employers Holdings, Inc. Condensed Balance Sheets December 31, 2024 2023 Assets (in millions, except share data) Investments: Investment in subsidiaries $ 1,006.7 $ 972.4 Fixed maturity securities at fair value (amortized cost $23.8 at December 31, 2024 and $1.3 at December 31, 2023) 23.8 1.3 Equity securities at fair value (cost $26.2 at December 31, 2024 and $26.2 at December 31, 2023) 24.5 24.2 Total investments 1,055.0 997.9 Cash and cash equivalents 9.8 20.3 Accrued investment income 0.1 0.1 Intercompany receivable 0.3 0.4 Federal income taxes receivable 4.3 — Deferred income taxes, net 2.0 1.9 Other assets 0.7 0.3 Total assets $ 1,072.2 $ 1,020.9 Liabilities and stockholders' equity Accounts payable and accrued expenses $ 2.8 $ 6.5 Intercompany payable 0.7 — Other liabilities — 0.5 Total liabilities 3.5 7.0 Stockholders' equity : Common stock, $0.01 par value; 150,000,000 shares authorized; 58,184,861 and 58,055,968 shares issued and 24,556,706 and 25,369,753 shares outstanding at December 31, 2024 and 2023, respectively 0.6 0.6 Additional paid-in capital 424.2 419.8 Retained earnings 1,472.9 1,384.3 Accumulated other comprehensive loss, net of tax (82.5) (86.0) Treasury stock, at cost (33,628,155 shares at December 31, 2024 and 32,686,215 shares at December 31, 2023) (746.5) (704.8) Total stockholders' equity 1,068.7 1,013.9 Total liabilities and stockholders' equity $ 1,072.2 $ 1,020.9 Employers Holdings, Inc. Condensed Statements of Income Years Ended December 31, 2024 2023 2022 (in millions, except per share data) Revenues Net investment income $ 3.1 $ 3.7 $ 3.6 Net realized and unrealized gains (losses) on investments 0.3 1.2 (6.5) Total revenues 3.4 4.9 (2.9) Expenses Underwriting and general and administrative expenses 10.0 12.1 13.5 Interest and financing expenses 0.1 0.4 0.5 Total expenses 10.1 12.5 14.0 Loss before income taxes and equity in earnings of subsidiaries (6.7) (7.6) (16.9) Income tax benefit (2.1) (1.3) (3.4) Net loss before equity in earnings of subsidiaries (4.6) (6.3) (13.5) Equity in earnings of subsidiaries 123.2 124.4 61.9 Net income $ 118.6 $ 118.1 $ 48.4 Earnings per common share: Basic $ 4.73 $ 4.48 $ 1.76 Diluted $ 4.71 $ 4.45 $ 1.75 Cash dividends declared per common share and eligible equity plan awards $ 1.18 $ 1.10 $ 3.28 Employers Holdings, Inc. Condensed Statement of Cash Flows Years Ended December 31, 2024 2023 2022 (in millions) Operating activities Net income $ 118.6 $ 118.1 $ 48.4 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries (30.9) (45.7) 117.6 Net realized and unrealized (gains) losses on investments (0.3) (1.2) 6.5 Stock-based compensation 6.3 6.2 5.1 Amortization of discounts and premiums on investments, net — — 0.1 Deferred income tax (benefit) expense (0.1) 1.1 (0.5) Change in operating assets and liabilities: Accounts payable, accrued expenses, and other liabilities (2.6) (0.2) 0.8 Federal income taxes (4.8) (7.8) 9.8 Other assets (0.3) 0.5 0.2 Intercompany payables and receivables 0.8 (0.9) 0.6 Other — — (0.1) Net cash provided by operating activities 86.7 70.1 188.5 Investing activities Purchases of fixed maturity securities (26.7) — (14.7) Purchases of equity securities — — (40.2) Purchases of short-term securities — (18.6) (24.7) Proceeds from sale of fixed maturity securities 4.2 6.6 16.0 Proceeds from sale of equity securities — 10.0 25.5 Proceeds from maturities of short-term investments — 39.3 4.0 Capital contributions to subsidiaries — (17.6) — Net cash (used in) provided by investing activities (22.5) 19.7 (34.1) Financing activities Acquisition of common stock and excise tax payments (42.6) (76.1) (30.4) Cash transactions related to stock-based compensation (1.8) (1.0) (1.2) Dividends paid to stockholders (30.3) (29.7) (90.3) Proceeds from line of credit advances — — 10.0 Repayments of line of credit advances — — (10.0) Net cash used in financing activities (74.7) (106.8) (121.9) Net (decrease) increase in cash and cash equivalents (10.5) (17.0) 32.5 Cash and cash equivalents at the beginning of the period 20.3 37.3 4.8 Cash and cash equivalents at the end of the period $ 9.8 $ 20.3 $ 37.3

Schedule VI. Supplemental Infor

Schedule VI. Supplemental Information (Notes)	12 Months Ended
	Dec. 31, 2024
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Text Block]	Schedule VI. Supplemental Information Concerning Property - Casualty Insurance Operations Employers Holdings, Inc. and Subsidiaries Consolidated Supplemental Information Concerning Property and Casualty Insurance Operations Year Deferred Reserves For Unearned Net Net Investment Losses and Losses and Amortization Paid Losses And LAE (including LPT Amortization and Adj) Net (in millions) Insurance Operations 2024 59.6 1,808.2 402.2 749.5 107.0 480.2 (24.0) 119.6 516.5 769.5 2023 55.6 1,884.5 379.7 721.9 106.5 457.8 (52.1) 113.8 464.9 760.6 2022 48.3 1,960.7 339.5 675.2 89.8 432.8 (41.8) 106.4 380.0 707.2

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net income	$ 118.6	$ 118.1	$ 48.4

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Summary of Significant Accounting Policies [Abstract]
Cash and Cash Equivalents, Policy	Cash and Cash Equivalents The Company considers all liquid investments with maturities of less than three months, as measured from the date of purchase, to be cash equivalents.
Restricted Cash and Cash Equivalents, Policy	Restricted Cash and Cash Equivalents Restricted cash and cash equivalents represent cash and cash equivalents held in trust in order to secure certain of the Company's obligations and, accordingly, are restricted as to withdrawal or usage. As of December 31, 2024 and 2023 the Company held $3.0 million in cash and investments in trust for reinsurance obligations, of which $0.2 million, represented restricted cash and cash equivalents for each year.
Investments, Policy	Short-Term Investments The Company considers all liquid investments with maturities of between three and twelve months, as measured from the date of purchase, to be short-term investments. Investment Securities The Company's investments in fixed maturity securities and short-term investments are classified as available-for-sale (AFS) and are reported at fair value with unrealized gains and losses excluded from earnings and reported as a separate component of stockholders' equity, net of deferred taxes, in Accumulated other comprehensive loss on the Company's Consolidated Balance Sheets. The Company's investments in equity securities at fair value are not classified as AFS and changes in fair value are included in Net realized and unrealized gains and losses on investments on the Company's Consolidated Statements of Comprehensive Income (Loss). The Company's investment in FHLB stock is presented within Equity securities at cost on the Company's Consolidated Balance Sheets. The Company's investments in other invested assets are reported at net asset value and changes in the value of these investments are included in Net realized and unrealized gains (losses) on investments on the Company's Consolidated Statements of Comprehensive Income (Loss). The Company's investments in fixed maturity securities are presented net of an allowance for current expected credit losses (CECL). The Company first assesses whether it intends to sell, or it is more likely than not that it will be required to sell, the security before recovery of its amortized cost basis. If either of the criteria is met, the security's amortized cost basis is written down to its fair value. For AFS debt securities that do not meet either criteria, the Company evaluates whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. The changes in the Company's allowance for CECL on investments are included in Net realized and unrealized gains (losses) on investments on the Company's Consolidated Statements of Comprehensive Income (Loss) (see Note 6). Investment income consists primarily of interest and dividends generated by investment securities. Interest is recorded as earned on an accrual basis and dividends are recorded as earned at the ex-dividend date. Interest income on mortgage-backed and asset-backed securities is determined using the effective-yield method based on estimated principal repayments. Mortgage-backed securities are adjusted for the effects of changes in prepayment assumptions on the related accretion of discount or amortization of premium of such securities using the retrospective method. Realized gains and losses on investments are determined on a specific-identification basis.
Revenue Recognition, Policy	Revenue Recognition Premiums written are recognized as revenues, net of any applicable underlying reinsurance coverage, and recognized as premiums earned, over the period of the contract in proportion to the amount of insurance protection provided. At the end of the policy term, premium audits are performed on substantially all policyholder accounts to determine the actual amount of net premiums earned for that policy year. Earned but unbilled premiums include estimated future audit premiums based on the Company's historical experience. These estimates are subject to changes in policyholders' payrolls and employee job classifications, economic conditions, and seasonality, and are continually reviewed and adjusted as experience develops or new information becomes known. Audit premium adjustments are included in premiums earned; however, these adjustments are partially offset by the resulting changes in losses and LAE, commission expenses, and premium taxes. The Company's premiums receivable on its Consolidated Balance Sheets included $25.7 million and $42.9 million of additional premiums expected to be received from policyholders for premium audits at December 31, 2024 and 2023, respectively. The Company establishes an allowance for CECL (see Note 6) on its premiums receivable through a charge included in underwriting and general and administrative expenses in its Consolidated Statements of Comprehensive Income (Loss). This allowance for CECL is determined based on estimates (collectability and historical payment patterns) and assumptions to project future experience. After all collection efforts have been exhausted, the Company reduces the allowance for CECL for write-offs of premiums receivable that have been deemed uncollectible. The Company's allowance for CECL was $19.2 million and $17.9 million at December 31, 2024 and 2023, respectively. The Company had write-offs charged against CECL of $13.8 million, $3.9 million, and $2.0 million for the years ended December 31, 2024, 2023, and 2022, respectively.
Deferred Policy Acquisition Costs, Policy	Deferred Policy Acquisition Costs Policy acquisition costs, those costs that relate directly to the successful acquisition of new or renewal insurance contracts, including underwriting, policy issuance and processing, medical and inspection, sales force contract selling and commissions are deferred and amortized as the related premiums are earned. Amortization of deferred policy acquisition costs for the years ended December 31, 2024, 2023, and 2022, was $119.6 million, $113.8 million, and $106.4 million, respectively. If the sum of a policy's expected losses and LAE and deferred policy acquisition costs exceeds the related unearned premiums and projected investment income, a premium deficiency is determined to exist. In this event, deferred policy acquisition costs are immediately expensed to the extent necessary to eliminate the premium deficiency. If the premium deficiency exceeds deferred acquisition costs, a liability is accrued for the excess deficiency. There were no premium deficiency adjustments recognized during the years ended December 31, 2024, 2023, and 2022.
Unpaid Loss and LAE Reserves, Policy	Unpaid Loss and LAE Reserves Unpaid loss and LAE reserves represent management's best estimate of the ultimate net cost of all reported and unreported losses incurred for the applicable periods, less payments made. The estimated reserves for losses and LAE include the accumulation of estimates for all claims reported prior to the balance sheet date, estimates of claims incurred but not reported, and estimates of expenses for investigating and adjusting all incurred and unadjusted claims (based on projections of relevant historical data). Amounts reported are subject to the impact of future changes in economic, regulatory and social conditions. Management believes that, subject to the inherent variability in any such estimate, the reserves are within a reasonable and acceptable range of adequacy. Estimates for claims prior to the balance sheet date are continually monitored and reviewed, and as settlements are made or reserves adjusted, the differences are reported in current operations. Salvage and subrogation recoveries are estimated based on a review of the level of historical salvage and subrogation recoveries.
Reinsurance, Policy	Reinsurance In the ordinary course of business, the Company purchases excess of loss reinsurance in order to protect it against the impact of large and/or catastrophic losses. The Company is also a party to the LPT Agreement (see Note 10). These reinsurance arrangements reduce the Company's exposure to such losses since its reinsurers are liable to the Company to the extent of the reinsurance protection provided. However, the Company remains liable for all losses it incurs to the extent that any reinsurer is unable or unwilling to make timely payments under its reinsurance agreements. Balances due from reinsurers on unpaid losses, including an estimate of such recoverables related to reserves for incurred but not reported losses, are reported as reinsurance recoverables on the Company's Consolidated Balance Sheets. Reinsurance recoverables on paid losses represent amounts currently due from reinsurers. Reinsurance recoverables on unpaid losses represent amounts that will be collectible from reinsurers once the losses are paid. Reinsurance recoverables on unpaid losses and LAE amounted to $411.5 million and $427.5 million at December 31, 2024 and 2023, respectively. The Company's reinsurance recoverables are presented net of an allowance for CECL. The changes in the Company's allowance for CECL are included in underwriting and general and administrative expenses on the Company's Consolidated Statements of Comprehensive Income (Loss) (see Note 6). This allowance for CECL is determined based on historical information, financial strength of reinsurers, collateralization amounts and ratings to determine the appropriateness of the allowance. Ceded reinsurance premiums are accounted for on a basis consistent with those used in accounting for the underlying premiums, and are reported as reductions to arrive at net premiums written and earned. Ceded losses and LAE are also accounted for on a basis consistent with those used in accounting for the original policies issued and the terms of the relevant reinsurance agreement, and are recorded as reductions to losses and LAE incurred. Pursuant to the LPT Agreement, LAE is deemed to be 7% of total losses paid and is payable to the Company as compensation for management of the claims under the LPT Agreement. The Deferred Gain is amortized using the recovery method, whereby the amortization is determined by the proportion of actual reinsurance recoveries to total estimated recoveries through the life of the LPT Agreement, and is recorded in losses and LAE incurred in the Company's Consolidated Statements of Comprehensive Income (Loss). Any adjustment to the estimated loss and LAE reserves ceded under the LPT Agreement results in a cumulative adjustment to the Deferred Gain, which is also recognized in losses and LAE incurred in the Company's Consolidated Statements of Comprehensive Income (Loss), such that the Deferred Gain reflects the balance that would have existed had the revised reserves been recognized at the inception of the LPT Agreement (LPT Reserve Adjustment). Additionally, the Company was entitled to a Contingent Commission under the LPT Agreement through June 30, 2024. The Contingent Commission was equal to 30% of the favorable difference between actual paid losses and LAE and expected paid losses and LAE as established in the LPT Agreement based on losses paid through that date. The Company recorded an estimate of Contingent Commission on its Consolidated Balance Sheets as Contingent commission receivable–LPT Agreement and a corresponding liability was recorded as Deferred reinsurance gain–LPT Agreement. The Contingent commission receivable–LPT Agreement was reduced as amounts were received from participating reinsurers. The Contingent Commission was payable every five years beginning June 30, 2004, and the final payment of the Contingent Commission of $14.6 million was received in the third quarter of 2024. The Deferred reinsurance gain–LPT Agreement is amortized using the recovery method. The amortization of the Contingent Commission was determined by the proportion of actual reinsurance recoveries to total estimated recoveries over the life of the Contingent Commission and was recorded in losses and LAE incurred in the Company's Consolidated Statements of Comprehensive Income (Loss). Any adjustment to the Contingent Commission under the LPT Agreement resulted in a cumulative adjustment to the Deferred Gain, which was also recognized in losses and LAE incurred in the Company's Consolidated Statements of Comprehensive Income (Loss), such that the Deferred Gain reflects the balance that would have existed had the revised Contingent Commission been recognized at the inception of the LPT Agreement (LPT Contingent Commission Adjustment).
Property, and Equipment, Policy	Property and Equipment Property and equipment are stated at cost less accumulated depreciation (see Note 7). Expenditures for maintenance and repairs are charged against operations as incurred. Electronic data processing equipment, software, furniture and equipment, and automobiles are depreciated using the straight-line method over 3 to 7 years. Leasehold improvements are carried at cost less accumulated amortization. The Company amortizes leasehold improvements using the straight-line method over the lesser of the useful life of the asset or the remaining original lease term, excluding options or renewal periods. Leasehold improvements are generally amortized over 3 to 8 years.
Cloud Computing Arrangements, Policy	Cloud Computing Arrangements The Company capitalizes software license fees and implementation costs associated with hosting arrangements that are service contracts. These amounts are included in Cloud computing arrangements on the Company's Consolidated Balance Sheets. Amortization of the software license fees is calculated using the straight-line method over the term of the service contract or based on the expected utilization of the asset. Amortization of the implementation costs are calculated using the straight-line method based on the term of the service contract and commence once the module or component is ready for its intended use, regardless of whether the hosted software has been placed into service, and will be recognized over the remaining life of the service contract.
Lessee, Leases, Policy	Operating leases The Company determines if an arrangement is a lease at the inception of the transaction. Leased office property meets the definition of operating leases under ASC 842 and is presented as a right-of-use asset (ROU asset) and lease liability on the Company's Consolidated Balance Sheets. ROU assets represent the right to use an underlying asset for the lease payments arising from the lease transaction. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of the lease payments over the lease term. The Company uses collateralized incremental borrowing rates to determine the present value of lease payments. The ROU assets also include lease payments less any lease incentives within a lease agreement. The Company's lease terms may include options to extend or terminate a lease. Lease expense for lease payments is recognized on a straight-line basis over the lease term. See Note 12 for additional disclosures related to operating leases. Finance Leases Leased property and equipment meeting finance lease criteria are capitalized at the lower of the present value of the related lease payments or the fair value of the leased asset at the inception of the lease. Financing leases for automobiles are included in property and equipment in other liabilities on the Company's Consolidated Balance Sheets. Amortization is calculated using the straight-line method based on the term of the lease and is included in the depreciation expense of property and equipment. See Note 12 for additional disclosures related to finance leases.
Income Taxes, Policy	Income Taxes The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the Company's financial statements. Under this method, the Company determines deferred tax assets and liabilities on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax rates in effect for the year in which the differences are expected to reverse. The Company recognizes tax positions that are determined to be more likely than not of being sustained upon examination. Recognized income tax positions are measured at the largest amount that has a greater than 50% likelihood of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company recognizes deferred tax assets when it determines that such assets are more likely than not to be realized in future periods. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, tax-planning strategies, projected future taxable income, projected future tax rates, and results of recent operations. If the Company determines that it is not more likely than not that it could realize its deferred tax assets in future periods, it would establish a deferred tax asset valuation allowance that would increase the Company's provision for income taxes. If the Company determines that it would be able to realize its deferred tax assets in the future in excess of its net recorded amount, the Company would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. The Company recognizes accrued interest and penalties, if any, in income taxes. For the years ended December 31, 2024 and 2023, the Company incurred no material interest and penalties.
Credit Risk, Policy	Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk are primarily cash and cash equivalents (including restricted cash equivalents), short-term investments, investment securities, premiums receivable, and reinsurance recoverable balances. The Company's cash equivalents and short-term investments include investments in money market securities and securities backed by the U.S. government. The Company's investment securities are diversified throughout many industries and geographic regions and include investments in U.S. government and U.S. government-sponsored enterprises. The Company believes that it has no significant concentrations of credit risk from a single issue or issuer within its cash equivalents, short-term investments and investment securities, other than concentrations in U.S. government and U.S. government-sponsored enterprises. The Company's premiums receivable are generally diversified due to the large number of entities composing the Company's policyholder base and their dispersion across many different industries. The Company monitors the financial condition of its reinsurers to minimize its exposure to significant losses from reinsurer insolvencies.
Fair Value of Financial Instruments, Policy	Fair Value of Financial Instruments The fair values of the Company's financial instruments have been determined using available market information and other appropriate valuation methodologies. Judgment is required in developing fair value estimates where quoted market prices are not available. Accordingly, these estimates are not necessarily indicative of the amounts that could be realized in a current market exchange. The use of different market assumptions or estimating methodologies may have an effect on the estimated fair value amounts. The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments: Cash and cash equivalents, short-term investments, premiums receivable, accounts payable and accrued expenses, and other liabilities. The carrying amounts for each of these financial instruments as reported in the Company's Consolidated Balance Sheets approximate their fair values. Investment securities. The Company's investment securities are predominantly valued on the basis of actual market transactions or observable inputs. A small portion of the Company's investment securities are valued on the basis of pricing models with significant unobservable inputs or nonbinding broker quotes (see Note 4).
Goodwill and Other Intangible Assets, Policy	Goodwill and Other Intangible Assets The Company formally tests for impairment of goodwill and intangible assets in the fourth quarter of each year. At the end of each quarter, management further considers the results of the previous analysis as well as any recent developments that may constitute triggering events requiring the impairment analysis of goodwill and other intangible assets to be updated. The Company assessed the effects of current economic conditions on the Company's financial condition and results of operations and changes in the Company's fair value and determined that there were no impairments of these assets as of December 31, 2024 and 2023. Intangible assets related to state licenses are not subject to amortization. Intangible assets related to insurance relationships were amortized in proportion to the expected period of benefit and were fully amortized as of December 31, 2018. The gross carrying value, accumulated amortization, and net carrying value for the Company's intangible assets, by major class, as of December 31, were as follows: 2024 2023 Gross Accumulated Net Gross Accumulated Net (in millions) State licenses $ 13.5 $ — $ 13.5 $ 13.5 $ — $ 13.5 Insurance relationships 9.4 $ (9.4) — 9.4 (9.4) — Other 0.1 — 0.1 0.1 — 0.1 Total $ 23.0 $ (9.4) $ 13.6 $ 23.0 $ (9.4) $ 13.6 There was no amortization expense in 2024 or 2023. Amortization expenses, when recognized, are included in the Company's Consolidated Statements of Comprehensive Income (Loss) in underwriting and general and administrative expenses.
Stock-based Compensation, Policy	Stock-Based Compensation The Company provides stock-based compensation to its directors and certain of its employees, which is recognized in its Consolidated Statements of Comprehensive Income (Loss) and based on estimated grant date fair values over the relevant service period (see Note 14).

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Summary of Significant Accounting Policies [Abstract]
Schedule of intangible assets table	The gross carrying value, accumulated amortization, and net carrying value for the Company's intangible assets, by major class, as of December 31, were as follows: 2024 2023 Gross Accumulated Net Gross Accumulated Net (in millions) State licenses $ 13.5 $ — $ 13.5 $ 13.5 $ — $ 13.5 Insurance relationships 9.4 $ (9.4) — 9.4 (9.4) — Other 0.1 — 0.1 0.1 — 0.1 Total $ 23.0 $ (9.4) $ 13.6 $ 23.0 $ (9.4) $ 13.6

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value of Financial Instruments [Abstract]
Estimated fair value of financial instruments table	The carrying value and the estimated fair value of the Company's financial instruments at fair value were as follows as of December 31: 2024 2023 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial assets (in millions) Total investments at fair value (Note 5) $ 2,351.6 $ 2,351.6 $ 2,180.6 $ 2,180.6 Cash and cash equivalents 68.3 68.3 226.4 226.4 Restricted cash and cash equivalents 0.2 0.2 0.2 0.2
Fair value, assets and liabilities measured on recurring basis table	The following table presents the Company's investments at fair value and the corresponding fair value measurements. December 31, 2024 December 31, 2023 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 (in millions) Fixed maturity securities U.S. Treasuries $ — $ 59.3 $ — $ — $ 58.4 $ — U.S. Agencies — — — — 2.1 — States and municipalities — 159.3 — — 210.2 — Corporate securities — 751.7 51.3 — 863.7 32.1 Residential mortgage-backed securities — 619.7 — — 362.2 — Commercial mortgage-backed securities — 65.2 — — 63.8 — Asset-backed securities — 199.7 14.3 — 113.9 14.1 Collateralized loan obligations — 35.3 — — 91.5 — Foreign government securities — 9.5 — — 10.4 — Other securities — 132.1 — — 113.9 — Total fixed maturity securities $ — $ 2,031.8 $ 65.6 $ — $ 1,890.1 $ 46.2 Equity securities at fair value Industrial and miscellaneous $ 215.1 $ — $ — $ 181.7 $ — $ — Other 39.0 — — 29.5 — — Total equity securities at fair value $ 254.1 $ — $ — $ 211.2 $ — $ — Short-term investments $ 0.1 $ — $ — $ 17.6 $ 15.5 $ — Total investments at fair value $ 254.2 $ 2,031.8 $ 65.6 $ 228.8 $ 1,905.6 $ 46.2
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]	The following table presents cash and investments carried at NAV on the Company's Consolidated Balance Sheets. December 31, 2024 December 31, 2023 (in millions) Cash equivalents measured at NAV 30.7 197.2 Other invested assets carried at NAV 106.6 91.5
Fair value, assets measured on recurring basis, unobservable input reconciliation table	The following table provides a reconciliation of the beginning and ending balances that are measured using Level 3 inputs. Years Ended December 31, 2024 2023 (in millions) Beginning balance $ 46.2 $ 24.2 Purchases 19.3 20.7 Unrealized gains included in comprehensive income or loss 0.1 1.3 Ending balance $ 65.6 $ 46.2

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2024
Investments [Abstract]
Debt Securities, Available-for-sale	The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the Company's AFS investments were as follows: Amortized Allowance for CECL Gross Gross Estimated At December 31, 2024 (in millions) Fixed maturity securities U.S. Treasuries $ 61.4 $ — $ 0.2 $ (2.3) $ 59.3 States and municipalities 163.0 — 1.1 (4.8) 159.3 Corporate securities 849.2 (0.2) 4.4 (50.4) 803.0 Residential mortgage-backed securities 663.5 — 1.6 (45.4) 619.7 Commercial mortgage-backed securities 69.6 (0.3) 0.1 (4.2) 65.2 Asset-backed securities 216.0 — 1.6 (3.6) 214.0 Collateralized loan obligations 35.5 — — (0.2) 35.3 Foreign government securities 12.7 — — (3.2) 9.5 Other securities (1) 132.2 (0.6) 0.9 (0.4) 132.1 Total fixed maturity securities 2,203.1 (1.1) 9.9 (114.5) 2,097.4 Short-term investments 0.1 — — — 0.1 Total AFS investments $ 2,203.2 $ (1.1) $ 9.9 $ (114.5) $ 2,097.5 At December 31, 2023 Fixed maturity securities U.S. Treasuries $ 60.3 $ — $ 0.6 $ (2.5) $ 58.4 U.S. Agencies 2.2 — — (0.1) 2.1 States and municipalities 212.3 — 3.1 (5.2) 210.2 Corporate securities 952.8 (2.1) 8.3 (63.2) 895.8 Residential mortgage-backed securities 399.3 — 0.9 (38.0) 362.2 Commercial mortgage-backed securities 70.2 — — (6.4) 63.8 Asset-backed securities 131.8 — 1.0 (4.8) 128.0 Collateralized loan obligations 92.2 — — (0.7) 91.5 Foreign government securities 12.7 — — (2.3) 10.4 Other securities (1) 114.2 (0.6) 1.0 (0.7) 113.9 Total fixed maturity securities 2,048.0 (2.7) 14.9 (123.9) 1,936.3 Short-term investments 33.1 — — — 33.1 Total AFS investments $ 2,081.1 $ (2.7) $ 14.9 $ (123.9) $ 1,969.4 (1) Other securities within fixed maturity securities consist of bank loans, which are classified as AFS and reported at fair value.
Equity securities table	The cost and estimated fair value of the Company's equity securities recorded at fair value at December 31, 2024 and 2023 were as follows: Cost Estimated Fair Value (in millions) At December 31, 2024 Equity securities at fair value Industrial and miscellaneous $ 117.4 $ 215.1 Other 27.6 39.0 Total equity securities at fair value $ 145.0 $ 254.1 At December 31, 2023 Equity securities at fair value Industrial and miscellaneous $ 104.4 $ 181.7 Other 21.5 29.5 Total equity securities at fair value $ 125.9 $ 211.2
Investments classified by contractual maturity date table	The amortized cost and estimated fair value of the Company's fixed maturity securities at December 31, 2024, by contractual maturity, are shown below. Expected maturities differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Estimated Fair Value (in millions) Due in one year or less $ 14.8 $ 14.8 Due after one year through five years 479.2 467.0 Due after five years through ten years 628.6 594.8 Due after ten years 95.9 86.6 Mortgage and asset-backed securities 984.6 934.2 Total $ 2,203.1 $ 2,097.4
Unrealized loss on investments table	The following is a summary of AFS investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or greater in each case as of December 31, 2024 and 2023. December 31, 2024 December 31, 2023 Estimated Fair Value Gross Unrealized Losses Number of Issues Estimated Fair Value Gross Unrealized Losses Number of Issues Less than 12 months: (dollars in millions) Fixed maturity securities U.S. Treasuries $ 26.5 $ (0.4) 8 $ 11.9 $ (0.1) 5 States and municipalities 48.0 (0.9) 20 39.5 (0.3) 15 Corporate securities 182.3 (4.0) 47 26.1 (0.8) 13 Residential mortgage-backed securities 190.6 (3.2) 111 15.8 (0.2) 15 Asset-backed securities 51.5 (0.8) 25 24.0 (0.1) 15 Other securities 29.2 (0.2) 133 12.6 (0.1) 70 Total fixed maturity securities 528.1 (9.5) 344 129.9 (1.6) 133 Total less than 12 months $ 528.1 $ (9.5) 344 $ 129.9 $ (1.6) 133 12 months or greater: Fixed maturity securities U.S. Treasuries $ 15.6 $ (1.9) 2 $ 23.7 $ (2.4) 7 U.S. Agencies — — — 2.2 (0.1) 1 States and municipalities 37.1 (3.9) 20 73.5 (4.9) 32 Corporate securities 430.0 (46.4) 219 684.5 (62.4) 331 Residential mortgage-backed securities 272.0 (42.2) 220 306.6 (37.8) 228 Commercial mortgage-backed securities 53.6 (4.2) 23 53.0 (6.4) 24 Asset-backed securities 42.0 (2.8) 27 47.0 (4.7) 29 Collateralized loan obligations 3.2 (0.2) 2 80.5 (0.7) 21 Foreign government securities 9.5 (3.2) 2 10.4 (2.3) 2 Other securities 2.5 (0.2) 20 10.2 (0.6) 58 Total fixed maturity securities 865.5 (105.0) 535 1,291.6 (122.3) 733 Total 12 months or greater $ 865.5 $ (105.0) 535 $ 1,291.6 $ (122.3) 733
Unrealized gain (loss) on investments table	Net realized gains on investments and the change in unrealized gains (losses) on the Company's investments recorded at fair value are determined on a specific-identification basis and were as follows: Gross Realized Gains Gross Realized Losses Net Decrease (Increase) Change in CECL Allowance Change in Net Unrealized Gains (Losses) Changes in Fair Value Reflected in Earnings Changes in Fair Value Reflected in AOCI (1) , before tax (in millions) Year Ended December 31, 2024 Fixed maturity securities $ 0.3 $ (10.7) $ 1.6 $ 4.4 $ (8.8) $ 4.4 Equity securities 4.9 (2.5) — 23.8 26.2 — Other invested assets — — — 6.7 6.7 — Total investments $ 5.2 $ (13.2) $ 1.6 $ 34.9 $ 24.1 $ 4.4 Year Ended December 31, 2023 Fixed maturity securities $ 1.0 $ (10.8) $ 1.8 $ 66.9 $ (8.0) $ 66.9 Equity securities 0.2 (5.7) — 32.5 27.0 — Other invested assets — — — 3.7 3.7 — Total investments $ 1.2 $ (16.5) $ 1.8 $ 103.1 $ 22.7 $ 66.9 Year Ended December 31, 2022 Fixed maturity securities $ 3.2 $ (2.5) $ (4.3) $ (252.5) $ (3.6) $ (252.5) Equity securities 41.2 (17.1) — (73.3) (49.2) — Other invested assets — — — 1.0 1.0 — Total investments $ 44.4 $ (19.6) $ (4.3) $ (324.8) $ (51.8) $ (252.5) (1) AOCI means Accumulated other comprehensive income or loss
Investment income table	Net investment income was as follows: Years Ended December 31, 2024 2023 2022 (in millions) Fixed maturity securities $ 91.1 $ 92.3 $ 81.1 Equity securities 6.8 6.8 8.3 Other invested assets 4.9 3.8 2.8 Short-term investments 1.5 2.6 0.2 Cash equivalents and restricted cash 6.8 4.7 2.1 Gross investment income 111.1 110.2 94.5 Investment expenses (4.1) (3.7) (4.7) Net investment income $ 107.0 $ 106.5 $ 89.8

Credit Losses (Tables)

Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2024
Credit Loss [Abstract]
Premium Receivable, Allowance for Credit Loss	The table below shows the changes in CECL on premiums receivable. Years Ended December 31, 2024 2023 (in millions) Beginning balance of the allowance for CECL on premiums receivable $ 17.9 $ 12.8 Current period provision for CECL 23.9 17.3 Write-offs charged against the allowance (13.8) (3.9) Recoveries collected (8.8) (8.3) Ending balance of the allowance for CECL on premiums receivable $ 19.2 $ 17.9
Reinsurance Recoverable, Allowance for Credit Loss	The table below shows the changes in CECL on reinsurance recoverables. Years Ended December 31, 2024 2023 (in millions) Beginning balance of the allowance for CECL on reinsurance recoverables $ 0.9 $ 0.9 Current period provision for CECL — — Ending balance of the allowance for CECL on reinsurance recoverables $ 0.9 $ 0.9
Debt Securities, Available-for-sale, Allowance for Credit Loss	The table below shows the changes in the allowance for CECL on AFS investments. Years Ended December 31, 2024 2023 (in millions) Beginning balance of CECL on AFS investments $ 2.7 $ 4.5 Net change in CECL provision 0.4 (0.1) Reductions in allowance from disposals (2.0) (1.7) Ending balance of CECL on AFS investments $ 1.1 $ 2.7

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2024
Property and Equipment [Abstract]
Property, plant and equipment table	Property and equipment consists of the following: As of December 31, 2024 2023 (in millions) Furniture and equipment $ 1.8 $ 1.8 Leasehold improvements 0.5 0.5 Computers and software 46.2 45.7 Automobiles 0.4 0.6 Property and equipment, gross 48.9 48.6 Accumulated depreciation (41.1) (42.1) Property and equipment, net $ 7.8 $ 6.5

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Taxes [Abstract]
Summary of income tax contingencies table	The Company's provision for income taxes consisted of the following: Years Ended December 31, 2024 2023 2022 Current tax expense: (in millions) Federal $ 23.1 $ 23.7 $ 23.6 State 0.8 1.5 1.1 Total current tax expense 23.9 25.2 24.7 Total deferred federal tax expense 4.2 5.1 (17.3) Income tax expense $ 28.1 $ 30.3 $ 7.4
Reconciliation of federal staturoty income tax rates to the effective tax rates table	The differences in amounts and percentages between the statutory federal tax rate of 21% and the Company's effective tax rate on net income before income taxes as reflected in the Consolidated Statements of Comprehensive Income (Loss) were as follows: Years Ended December 31, 2024 2023 2022 (in millions) (percent) (in millions) (percent) (in millions) (percent) U.S. Federal statutory tax rate $ 30.8 21.0 % $ 31.2 21.0 % $ 11.7 21.0 % State income tax expense, net of federal income tax effect (1) 0.6 0.4 1.1 0.8 0.9 1.5 Tax credits (0.8) (0.5) (0.3) (0.2) (0.2) (0.4) Nontaxable or nondeductible items Tax-advantaged investment income (0.4) (0.3) (0.9) (0.6) (1.4) (2.5) LPT deferred gain amortization and LPT reserve adjustments (1.2) (0.8) (1.5) (1.0) (1.7) (3.1) IRC section 162(m), excessive employee remuneration 0.8 0.6 0.9 0.6 0.8 1.4 Tax benefit attributable to repeal of IRC section 847 — — — — (1.4) (2.5) Pre-Privatization loss and LAE reserve adjustments, excluding LPT (1.1) (0.8) (0.1) — (0.9) (1.7) Other (0.6) (0.4) (0.1) (0.2) (0.4) (0.4) Effective tax rate $ 28.1 19.2 % $ 30.3 20.4 % $ 7.4 13.3 % (1) Florida and Illinois make up the majority (greater than 50 percent) of the state income tax expense, net of federal income tax effect category.
Deferred tax assets and liabilities	The significant components of deferred income taxes, net, were as follows as of December 31: 2024 2023 Deferred Tax Deferred Tax Assets Liabilities Assets Liabilities (in millions) Unrealized capital gains and losses, net $ — $ 4.3 $ 3.1 $ — Deferred policy acquisition costs — 12.7 — 11.9 Intangible assets — 1.6 — 1.6 Loss reserve discounting for income tax reporting 31.4 — 31.2 — Unearned premiums 15.8 — 14.9 — Allowance for bad debt 4.2 — 4.0 — Stock-based compensation 1.6 — 1.6 — Accrued liabilities 4.2 — 4.9 — Operating leases 0.9 0.8 1.2 1.1 Other 9.3 9.7 3.2 6.1 Total $ 67.4 $ 29.1 $ 64.1 $ 20.7 Deferred income tax asset, net $ 38.3 $ 43.4
Schedule of Unrecognized Tax Benefits Roll Forward	The changes in the balances of gross unrecognized tax benefits were as follows: Years Ended December 31, 2024 2023 2022 (in millions) Beginning balance of unrecognized tax benefits $ 0.6 $ 0.4 $ 0.3 Increases resulting from prior period tax provisions 0.4 — 0.1 Increases resulting from current period tax provisions 0.5 0.2 0.1 Decreases resulting from lapse of applicable statute of limitations (0.1) — (0.1) Ending balance of unrecognized tax benefits $ 1.4 $ 0.6 $ 0.4

Liability for Unpaid Losses a_2

Liability for Unpaid Losses and Loss Adjustment Expenses (Tables)	12 Months Ended
	Dec. 31, 2024
Liability for Unpaid Losses and Loss Adjustment Expenses [Abstract]
Changes in the liability for unpaid losses and LAE table	The following table represents a reconciliation of changes in the liability for unpaid losses and LAE. Years Ended December 31, 2024 2023 2022 (in millions) Unpaid losses and LAE at beginning of period $ 1,884.5 $ 1,960.7 $ 1,981.2 Less reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 428.4 445.4 476.9 Net unpaid losses and LAE at beginning of period 1,456.1 1,515.3 1,504.3 Losses and LAE, net of reinsurance, incurred during the period related to: Current year 480.2 457.8 432.8 Prior years (18.4) (44.9) (33.5) Total net losses and LAE incurred during the period 461.8 412.9 399.3 Paid losses and LAE, net of reinsurance, related to: Current year 127.1 111.7 92.5 Prior years 395.0 360.4 295.8 Total net paid losses and LAE during the period 522.1 472.1 388.3 Ending unpaid losses and LAE, net of reinsurance 1,395.8 1,456.1 1,515.3 Reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 412.4 428.4 445.4 Unpaid losses and LAE at end of period $ 1,808.2 $ 1,884.5 $ 1,960.7
Short-duration Insurance Contracts, Claims Development [Table Text Block]	The Company analyzed the usefulness of disaggregation of its results and determined the characteristics associated with the policies and the related unpaid loss reserves, incurred losses, and payment patterns are similar in nature. As such, the following tables show the Company's historical incurred and cumulative paid losses and LAE development, net of reinsurance, as well as IBNR loss reserves and the number of reported claims on an aggregated basis as of December 31, 2024 for each of the previous ten accident years. Incurred Losses and DCC, Net of Reinsurance Years Ended December 31, As of December 31, 2024 Accident Year 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 (1) 2020 (1) 2021 (1) 2022 (1) 2023 (1) 2024 IBNR Cumulative number of reported claims (in millions, except claims counts) 2015 $ 422.2 $ 425.8 $ 423.9 $ 419.6 $ 408.7 $ 396.7 $ 384.9 $ 381.9 $ 374.9 $ 370.4 $ 14.3 27,293 2016 419.0 414.6 395.4 375.0 364.6 354.8 350.4 347.1 342.4 16.2 25,833 2017 412.4 391.3 358.3 337.9 329.8 326.9 322.5 315.8 18.2 25,128 2018 422.5 424.6 407.7 400.6 400.5 400.5 400.8 22.8 28,028 2019 422.4 435.7 448.5 448.8 443.9 441.7 34.6 33,060 2020 365.7 374.0 373.3 366.9 364.4 27.0 24,320 2021 339.2 339.0 348.9 359.4 24.1 23,096 2022 399.3 400.7 400.7 48.0 23,559 2023 421.4 433.3 77.7 24,053 2024 442.3 188.6 21,615 Total $ 3,871.2 Cumulative Paid Losses and DCC, Net of Reinsurance Years Ended December 31, Accident Year 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 (1) 2020 (1) 2021 (1) 2022 (1) 2023 (1) 2024 (in millions) 2015 $ 65.5 $ 174.5 $ 246.9 $ 290.5 $ 311.2 $ 322.2 $ 329.3 $ 333.7 $ 337.6 $ 340.9 2016 65.6 166.8 227.7 261.2 278.3 290.0 298.1 302.3 309.2 2017 63.5 160.2 215.7 243.7 260.0 269.5 277.1 283.5 2018 77.9 189.9 254.2 293.6 315.2 340.1 352.3 2019 88.8 212.6 285.2 325.8 354.4 374.5 2020 71.9 175.6 233.5 274.3 299.6 2021 66.1 166.8 231.2 277.5 2022 76.5 203.7 279.0 2023 92.5 240.7 2024 106.9 Total $ 2,864.1 All outstanding liabilities for unpaid losses and DCC prior to 2015, net of reinsurance 321.9 Total outstanding liabilities for unpaid losses and DCC, net of reinsurance $ 1,329.0 (1) Data presented for these calendar years is required supplementary information, which is unaudited.
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block]	The following table represents a reconciliation of claims development to the aggregate carrying amount of the liability for unpaid losses and LAE: December 31, 2024 (in millions) Liabilities for unpaid losses and LAE, net of reinsurance $ 1,329.0 Reinsurance recoverable, excluding CECL allowance, on unpaid losses 412.4 AO 66.8 Total liability for unpaid losses and LAE $ 1,808.2
Short-duration Insurance Contracts, Schedule of Historical Claims Duration [Table Text Block]	The following table presents the average annual percentage payout of incurred claims by age, net of reinsurance, as of December 31, 2024 and is presented as required supplementary information, which is unaudited: Average Annual Percentage Payout of Claims by Age, Net of Reinsurance Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 19.9 % 29.8 % 17.5 % 10.5 % 5.8 % 4.0 % 2.4 % 1.5 % 1.6 % 0.9 %

Reinsurance (Tables)

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2024
Reinsurance [Abstract]
Supplemental schedule of reinsurance premiums for insurance companies table	The effects of reinsurance on the Company's written and earned premiums and on its losses and LAE incurred were as follows: Years Ended December 31, 2024 2023 2022 Written Earned Written Earned Written Earned (in millions) Direct premiums $ 767.8 $ 747.8 $ 758.6 $ 719.9 $ 705.3 $ 673.2 Assumed premiums 8.5 8.5 9.1 9.1 8.9 9.0 Gross premiums 776.3 756.3 767.7 729.0 714.2 682.2 Ceded premiums (6.8) (6.8) (7.1) (7.1) (7.0) (7.0) Net premiums $ 769.5 $ 749.5 $ 760.6 $ 721.9 $ 707.2 $ 675.2 Ceded losses and LAE incurred $ 13.1 $ 17.0 $ 3.5 Ceded losses and LAE incurred includes the amortization of the Deferred Gain, LPT Reserve Adjustments, and LPT Contingent Commission adjustments.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies [Abstract]
Lease, Cost [Table Text Block]	Components of lease expense were as follows: Years Ended December 31, 2024 2023 (in millions) Operating lease expense $ 1.1 $ 1.6 Finance lease expense 0.1 0.2 Total lease expense $ 1.2 $ 1.8
Operating and capital leases schedule of future minimum lease payments table	Year Operating Leases Finance Leases (in millions) 2025 $ 1.5 $ 0.1 2026 1.2 — 2027 1.2 — 2028 0.4 — 2029 — — Thereafter — — Total lease payments 4.3 0.1 Less: imputed interest (0.1) — Total $ 4.2 $ 0.1
Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows: As of December 31, 2024 2023 (in millions) Operating leases: Operating lease right-of-use asset $ 3.7 5.1 Operating lease liability 4.2 5.9 Finance leases: Property and equipment, gross 0.4 0.6 Accumulated depreciation (0.3) (0.4) Property and equipment, net 0.1 0.2 Other liabilities $ 0.1 $ 0.2
Cash Flow, Supplemental Disclosures [Text Block]	Supplemental cash flow information related to leases was as follows: Years Ended December 31, 2024 2023 (in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 1.1 $ 1.6 Financing cash flows used for finance leases 0.1 0.2

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2024
Stock-Based Compensation [Abstract]
Schedule of compensation cost for share-based payment arrangements, allocation of share-based compensation costs by plan table	Net stock-based compensation expense recognized in the Company's Consolidated Statements of Comprehensive Income (Loss) was as follows: Years Ended December 31, 2024 2023 2022 Stock-based compensation expense related to: (in millions) RSUs 3.2 3.5 2.6 PSUs 3.0 2.6 2.3 Total 6.2 6.1 4.9 Less: related tax benefit 1.3 1.3 1.0 Net stock-based compensation expense $ 4.9 $ 4.8 $ 3.9
Schedule of share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding table	Changes in outstanding stock options as of December 31, were as follows: Number of Stock Options Weighted-Average Price Weighted Average Remaining Contractual Life Stock options outstanding at January 1, 2022 65,165 $ 25.96 0.7 years Exercised (41,665) 24.97 Stock options outstanding at December 31, 2022 23,500 27.72 0.2 years Exercised (23,500) 27.72 Stock options outstanding at December 31, 2023 — — 0.0 years
Schedule of fair value of options vested and instrinsic value of outstanding and exercisable options table	The fair value of stock options vested and the intrinsic value of outstanding and exercisable stock options as of December 31, were as follows: 2024 2023 2022 (in millions) Intrinsic value of outstanding stock options — — 0.4 Intrinsic value of exercisable stock options — — 0.4
Schedule of share-based compensation, restricted stock and restricted stock units activity	Changes in outstanding RSUs as of December 31, were as follows: Number of RSUs Weighted Average Grant Date Fair Value RSUs outstanding at January 1, 2022 198,126 $ 34.53 Granted 124,042 39.90 Forfeited (13,728) 38.45 Vested (51,127) 37.69 RSUs outstanding at December 31, 2022 257,313 36.28 Granted 112,114 40.05 Forfeited (27,447) 40.06 Vested (111,158) 33.83 RSUs outstanding at December 31, 2023 230,822 38.84 Granted 89,783 45.33 Forfeited (18,251) 42.16 Vested (88,062) 38.59 RSUs outstanding at December 31, 2024 214,292 41.40 Vested but unsettled RSUs at December 31, 2024 31,553 35.46
Schedule of fair value of RSUs vested and instrinsic value of outstanding and vested RSUs table	The grant date fair value of RSUs vested and the intrinsic value of vested RSUs for the years ended December 31, were as follows: 2024 2023 2022 (in millions) Grant date fair value of RSUs vested $ 3.4 $ 3.8 $ 1.9 Intrinsic value of RSUs vested 4.0 4.4 2.1
Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block]	The Company has awarded PSUs to certain employees of the Company as follows: Date of Grant Target Number Awarded Fair Value on Date of Grant Aggregate Fair Value on Date of Grant (in millions) March 2022 (1) 73,120 40.54 3.0 March 2023 (2) 81,800 41.14 3.4 April 2023 (2) 1,220 42.34 0.1 February 2024 (2) 77,360 46.36 3.6 (1) The PSUs awarded in March 2022, had a performance period of two years, followed by an additional one year vesting period. These awards were subject to certain performance goals with payouts that ranged from 0% to 250% of the target awards. The actual performance goal achieved was determined to be 59% of target in February 2024. The values shown in the table represent the aggregate number of PSUs that were originally awarded at the target level. (2) The PSUs awarded in March 2023, April 2023, and February 2024 have a performance period of three years. These PSU awards are subject to certain performance goals with payouts that range from 0% to 250% of the target awards. The values shown in the table represent the aggregate number of PSUs awarded at the target level.

Statutory Matters (Tables)

Statutory Matters (Tables)	12 Months Ended
	Dec. 31, 2024
Stautory Matters [Abstract]
Statutory accounting practices disclosure table	The combined capital stock, surplus, and net income of the Company's insurance subsidiaries (EICN, ECIC, EPIC, EAC, and CIC), prepared in accordance with the statutory accounting practices (SAP) of the National Association of Insurance Commissioners (NAIC) as well as SAP permitted by the states of California, Florida, Nevada, and New York were as follows: December 31, 2024 2023 (in millions) Capital stock and unassigned surplus $ 776.7 $ 739.7 Paid in capital 243.2 243.2 Total statutory surplus $ 1,019.9 $ 982.9

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income, Net (Tables)	12 Months Ended
	Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of accumulated other comprehensive income (loss) table	The following table summarizes the components of Accumulated other comprehensive loss: Years Ended December 31, 2024 2023 (in millions) Net unrealized losses on investments, before taxes $ (104.5) $ (108.9) Deferred tax benefit on net unrealized losses 22.0 22.9 Total accumulated other comprehensive loss $ (82.5) $ (86.0)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Net income and weighted average common shares outstanding used in earnings per share calculations table	The following table presents the net income and the weighted average number of shares outstanding used in the earnings per common share calculations. Years Ended December 31, 2024 2023 2022 (in millions, except share data) Net income $ 118.6 $ 118.1 $ 48.4 Weighted average number of shares outstanding–basic 25,050,605 26,368,801 27,503,941 Effect of dilutive securities: Stock options — 2,072 11,256 PSUs 86,920 110,342 131,465 RSUs 57,289 42,436 34,326 Dilutive potential shares 144,209 154,850 177,047 Weighted average number of shares outstanding–diluted 25,194,814 26,523,651 27,680,988

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]	Insurance Operations Total (in millions) Year Ended December 31, 2024 Gross premiums written $ 776.3 $ 776.3 Net premiums written $ 769.5 $ 769.5 Net premiums earned $ 749.5 $ 749.5 Net investment income 107.0 107.0 Net realized and unrealized gains on investments 24.1 24.1 Other income 0.1 0.1 Total revenues 880.7 880.7 Losses and loss adjustment expenses 456.2 456.2 Commission expense 101.2 101.2 Compensation-related expenses (1) 108.9 108.9 Information technology expenses (1) 12.0 12.0 Professional fees (1) 19.3 19.3 Depreciation and amortization expenses (1) 16.7 16.7 Other underwriting and general and administrative expenses (1) (2) 9.4 9.4 AO and other expense allocations (3) (48.0) (48.0) Premium taxes and assessments 29.5 29.5 Policyholder dividends 11.2 11.2 Bad debt expense 17.5 17.5 Interest and financing expenses 0.1 0.1 Total expenses $ 734.0 $ 734.0 Net income before income taxes 146.7 146.7 Income tax expense 28.1 28.1 Net income (4) $ 118.6 $ 118.6 Combined ratio 98.7 % 98.7 % Insurance Operations Total (in millions) Year Ended December 31, 2023 Gross premiums written $ 767.7 $ 767.7 Net premiums written $ 760.6 $ 760.6 Net premiums earned $ 721.9 $ 721.9 Net investment income 106.5 106.5 Net realized and unrealized gains on investments 22.7 22.7 Other (loss) income (0.2) (0.2) Total revenues 850.9 850.9 Losses and loss adjustment expenses 405.7 405.7 Commission expense 100.0 100.0 Compensation-related expenses (1) 109.2 109.2 Information technology expenses (1) 12.8 12.8 Professional fees (1) 22.1 22.1 Depreciation and amortization expenses (1) 21.5 21.5 Other underwriting and general and administrative expenses (1) (2) 12.6 12.6 AO and other expense allocations (3) (46.5) (46.5) Premium taxes and assessments 27.9 27.9 Policyholder dividends 10.3 10.3 Bad debt expense 10.1 10.1 Interest and financing expenses 5.8 5.8 Other expenses 11.0 11.0 Total expenses $ 702.5 $ 702.5 Net income before income taxes 148.4 148.4 Income tax expense 30.3 30.3 Net income (4) $ 118.1 $ 118.1 Combined ratio 96.0 % 96.0 % Insurance Operations Total (in millions) Year Ended December 31, 2022 Gross premiums written $ 714.2 $ 714.2 Net premiums written $ 707.2 $ 707.2 Net premiums earned $ 675.2 $ 675.2 Net investment income 89.8 89.8 Net realized and unrealized (losses) on investments (51.8) (51.8) Other income 0.3 0.3 Total revenues 713.5 713.5 Losses and loss adjustment expenses 391.0 391.0 Commission expense 95.9 95.9 Compensation-related expenses (1) 96.6 96.6 Information technology expenses (1) 12.5 12.5 Professional fees (1) 18.2 18.2 Depreciation and amortization expenses (1) 21.7 21.7 Other underwriting and general and administrative expenses (1) (2) 14.0 14.0 AO and other expense allocations (3) (38.8) (38.8) Premium taxes and assessments 28.4 28.4 Policyholder dividends 7.7 7.7 Bad debt expense 7.0 7.0 Interest and financing expenses 3.5 3.5 Total expenses $ 657.7 $ 657.7 Net income before income taxes 55.8 55.8 Income tax expense 7.4 7.4 Net income (4) $ 48.4 $ 48.4 Combined ratio 98.1 % 98.1 %
Revenue from External Customers by Geographic Areas [Table Text Block]	2024 2023 2022 State In-force Premiums Policies In-force Premiums Policies In-force Premiums Policies (dollars in millions) California $ 336.1 44,540 $ 311.5 43,353 $ 279.7 42,876 Florida 60.1 10,943 56.6 10,008 49.4 9,417 New York 36.1 7,938 31.9 7,603 27.3 7,497 Other (43 states and D.C.) 309.8 67,346 294.6 65,445 266.1 61,566 Total $ 742.1 130,767 $ 694.6 126,409 $ 622.5 121,356 Estimated audit premium 26.1 — 14.8 — 31.5 — Total, including estimated audit premium $ 768.2 130,767 $ 709.4 126,409 $ 654.0 121,356

Basis of Presentation Reportabl

Basis of Presentation Reportable Segments (Details) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($)	Dec. 31, 2022
Segment Reporting [Abstract]
Number of Reportable Segments		2
Proceeds from Commissions Received	$ 14.6

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Funds held by or deposited with reinsurers			$ 3,000,000	$ 3,000,000
Restricted cash and cash equivalents			200,000	200,000
Premiums receivable from policyholders for final audit			25,700,000	42,900,000
Beginning balance of the allowance for CECL on premiums receivable			19,200,000	17,900,000	$ 12,800,000
Write-offs, net of recoveries of amounts previously written off			13,800,000	3,900,000	2,000,000
Deferred policy acquisition cost, amortization expense			119,600,000	113,800,000	106,400,000
Premium Deficiency			0	0	$ 0
Unpaid losses			$ 411,500,000	427,500,000
LPT - loss expense as a percentange of losses paid, for management of LPT claims			7%
LPT favorable/ unfavorable difference, percentage		30%
Goodwill and other intangible asset impairment			$ 0	0
Amortization of intangible assets			$ 0	0
Income Tax Examination, Likelihood of Unfavorable Settlement			50
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, gross carrying amount			$ 23,000,000	23,000,000
Intangible assets, accumulated amortization			(9,400,000)	(9,400,000)
Intangible assets, net			13,600,000	13,600,000
Proceeds from Commissions Received	$ 14,600,000
Short-term investments at fair value (amortized cost $0.1 at December 31, 2024 and $33.1 at December 31, 2023)			100,000	33,100,000
Minimum [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Short-term investments at fair value (amortized cost $0.1 at December 31, 2024 and $33.1 at December 31, 2023)			$ 3
Minimum [Member] | Leasehold improvements
Property, Plant and Equipment, Useful Life			3 years
Minimum [Member] | Electronic Data Processing Equipment, Software, Furniture and Equipment and Automobiles [Member]
Property, Plant and Equipment, Useful Life			3 years
Maximum [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Short-term investments at fair value (amortized cost $0.1 at December 31, 2024 and $33.1 at December 31, 2023)			$ 12
Maximum [Member] | Leasehold improvements
Property, Plant and Equipment, Useful Life			8 years
Maximum [Member] | Electronic Data Processing Equipment, Software, Furniture and Equipment and Automobiles [Member]
Property, Plant and Equipment, Useful Life			7 years
Funds Held in Trust, Reinsurance Agreement [Domain]
Restricted cash and cash equivalents			$ 200,000	200,000
Licensing Agreements [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, gross carrying amount			13,500,000	13,500,000
Intangible assets, accumulated amortization			0	0
Intangible assets, net			13,500,000	13,500,000
Service Agreements [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, gross carrying amount			9,400,000	9,400,000
Intangible assets, accumulated amortization			(9,400,000)	(9,400,000)
Intangible assets, net			0	0
Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Net			100,000	100,000
Finite-Lived Intangible Assets, Gross			100,000	100,000
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, accumulated amortization			$ 0	$ 0

Fair Value of Financial Instr_3

Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments at fair value	$ 2,351.6	$ 2,180.6
Total investments at fair value, estimated fair value	2,351.6	2,180.6
Cash and cash equivalents	68.3	226.4
Cash and cash equivalents, estimated fair value	68.3	226.4
Restricted cash and cash equivalents	$ 0.2	0.2
Fair value investments entities that calculate net asset value per share liquidating investment original expected lives increments	1 year
Unfunded commitment, private investment fund	$ 15.6	25.4
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	12 years
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	$ 0.2	$ 0.2

Fair Value of Financial Instr_4

Fair Value of Financial Instruments, Fair Value Inputs (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		$ 2,097.4	$ 1,936.3
Short-Term Investments, Total		0.1	33.1
Total investments		2,463.9	2,278.1
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Equity Securities, FV-NI, Current		254.1	211.2
Total investments		254.2	228.8
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		2,031.8	1,890.1
Equity Securities, FV-NI, Current		0	0
Total investments		2,031.8	1,905.6
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		65.6	46.2
Equity Securities, FV-NI, Current		0	0
Total investments		65.6	46.2
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		59.3	58.4
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		59.3	58.4
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
US Government Agencies Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value			2.1
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	2.1
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		159.3	210.2
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		159.3	210.2
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		803	895.8
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		751.7	863.7
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		51.3	32.1
Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		619.7	362.2
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		619.7	362.2
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		65.2	63.8
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		65.2	63.8
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		214	128
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		199.7	113.9
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		14.3	14.1
Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		35.3	91.5
Collateralized Loan Obligations | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Collateralized Loan Obligations | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		35.3	91.5
Collateralized Loan Obligations | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Foreign Government Debt | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Foreign Government Debt | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		9.5	10.4
Foreign Government Debt | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Other Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	[1]	132.1	113.9
Other Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Other Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		132.1	113.9
Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0	0
Industrial and miscellaneous
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Current		215.1	181.7
Industrial and miscellaneous | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Current		215.1	181.7
Industrial and miscellaneous | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Current		0	0
Industrial and miscellaneous | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Current		0	0
Other equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Current		39	29.5
Other equities | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Current		39	29.5
Other equities | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Current		0	0
Other equities | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Current		0	0
Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		0.1	33.1
Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-Term Investments, Total		0.1	17.6
Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-Term Investments, Total		0	15.5
Short-term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-Term Investments, Total		$ 0	$ 0
[1] Other securities within fixed maturity securities consist of bank loans, which are classified as AFS and reported at fair value.

Fair Value of Financial Instr_5

Fair Value of Financial Instruments Instruments Carried at NAV (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Instruments Carried at NAV [Abstract]
Fair value investments entities that calculate net asset value per share liquidating investment original expected lives increments	1 year
Unfunded commitment, private investment fund	$ 15.6	$ 25.4
Cash equivalents measured at NAV, which approximates fair value	30.7	197.2
Alternative Investment	$ 106.6	$ 91.5

Fair Value, Measurement with Un

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 46.2	$ 24.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	19.3	20.7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0.1	1.3
Ending balance	$ 65.6	$ 46.2

Investments Available for Sale

Investments Available for Sale Securities (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		$ 2,203.1	$ 2,048
Debt Securities, Available-for-sale, Allowance for Credit Loss		(1.1)	(2.7)	$ (4.5)
Debt securities, available-for-sale, gross unrealized gain		9.9	14.9
Debt securities, available-for-sale, gross unrealized loss		(114.5)	(123.9)
Fixed maturity securities, fair value		2,097.4	1,936.3
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		61.4	60.3
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Debt securities, available-for-sale, gross unrealized gain		0.2	0.6
Debt securities, available-for-sale, gross unrealized loss		(2.3)	(2.5)
Fixed maturity securities, fair value		59.3	58.4
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost			2.2
Debt Securities, Available-for-sale, Allowance for Credit Loss			0
Debt securities, available-for-sale, gross unrealized gain			0
Debt securities, available-for-sale, gross unrealized loss			(0.1)
Fixed maturity securities, fair value			2.1
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		163	212.3
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Debt securities, available-for-sale, gross unrealized gain		1.1	3.1
Debt securities, available-for-sale, gross unrealized loss		(4.8)	(5.2)
Fixed maturity securities, fair value		159.3	210.2
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		849.2	952.8
Debt Securities, Available-for-sale, Allowance for Credit Loss		(0.2)	(2.1)
Debt securities, available-for-sale, gross unrealized gain		4.4	8.3
Debt securities, available-for-sale, gross unrealized loss		(50.4)	(63.2)
Fixed maturity securities, fair value		803	895.8
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		663.5	399.3
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Debt securities, available-for-sale, gross unrealized gain		1.6	0.9
Debt securities, available-for-sale, gross unrealized loss		(45.4)	(38)
Fixed maturity securities, fair value		619.7	362.2
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		69.6	70.2
Debt Securities, Available-for-sale, Allowance for Credit Loss		(0.3)	0
Debt securities, available-for-sale, gross unrealized gain		0.1	0
Debt securities, available-for-sale, gross unrealized loss		(4.2)	(6.4)
Fixed maturity securities, fair value		65.2	63.8
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		216	131.8
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Debt securities, available-for-sale, gross unrealized gain		1.6	1
Debt securities, available-for-sale, gross unrealized loss		(3.6)	(4.8)
Fixed maturity securities, fair value		214	128
Other Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	[1]	132.2	114.2
Debt Securities, Available-for-sale, Allowance for Credit Loss		(0.6)	(0.6)
Debt securities, available-for-sale, gross unrealized gain	[1]	0.9	1
Debt securities, available-for-sale, gross unrealized loss	[1]	(0.4)	(0.7)
Fixed maturity securities, fair value	[1]	132.1	113.9
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		35.5	92.2
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Debt securities, available-for-sale, gross unrealized gain		0	0
Debt securities, available-for-sale, gross unrealized loss		(0.2)	(0.7)
Fixed maturity securities, fair value		35.3	91.5
Sovereign Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		12.7	12.7
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Debt securities, available-for-sale, gross unrealized gain		0	0
Debt securities, available-for-sale, gross unrealized loss		(3.2)	(2.3)
Fixed maturity securities, fair value		9.5	10.4
Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		0.1	33.1
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Debt securities, available-for-sale, gross unrealized gain		0	0
Debt securities, available-for-sale, gross unrealized loss		0	0
Fixed maturity securities, fair value		0.1	33.1
Total AFS Investments [Domain]
Debt Securities, Available-for-sale [Line Items]
Total Available for sale Debt Securities and Short-term investments, Cost		2,203.2	2,081.1
Total Available for sale Debt Securities and Short-term investments, Unrealized Gain		9.9	14.9
Total Available for sale Debt Securities and Short-term investments, Unrealized Loss		114.5	123.9
Total Available for sale investments		$ 2,097.5	$ 1,969.4
[1] Other securities within fixed maturity securities consist of bank loans, which are classified as AFS and reported at fair value.

Investments Equity Securities (

Investments Equity Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Equity Securities [Line Items]
Equity securities, cost	$ 145	$ 125.9
Equity Securities, FV-NI, Total	254.1	211.2
Industrial and miscellaneous
Equity Securities [Line Items]
Equity securities, cost	117.4	104.4
Equity Securities, FV-NI	215.1	181.7
Other equities
Equity Securities [Line Items]
Equity securities, cost	27.6	21.5
Equity Securities, FV-NI	$ 39	$ 29.5

Investments Other Invested Asse

Investments Other Invested Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Other Invested Assets [Abstract]
Other Investments, NAV	$ 106.6	$ 91.5
Other Investments, Cost	$ 90.9	$ 82.5

Investments, Amortized Cost and

Investments, Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less, amortized cost	$ 14.8
Due after one year through five years, amortized cost	479.2
Due after five years through ten years, amortized cost	628.6
Due after ten years, amortized cost	95.9
Mortgage and asset-backed securities, amortized cost	984.6
Debt securities, available-for-sale, amortized cost	2,203.1	$ 2,048
Estimated Fair Value
Due in one year or less, fair value	14.8
Due after one year through five years, fair value	467
Due after five years through ten years, fair value	594.8
Due after ten years, fair value	86.6
Mortgage and asset-backed securities, fair value	934.2
Fixed maturity securities, fair value	$ 2,097.4	$ 1,936.3

Investments, Continuous Loss Po

Investments, Continuous Loss Position (Details) $ in Millions	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 528.1	$ 129.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(9.5)	(1.6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	865.5	1,291.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (105)	$ (122.3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months | shares	344	133
Debt Securities, number of issues in loss position, 12 months or longer | shares	535	733
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 26.5	$ 11.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(0.4)	(0.1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	15.6	23.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1.9)	$ (2.4)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months | shares	8	5
Debt Securities, number of issues in loss position, 12 months or longer | shares	2	7
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 2.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ (0.1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, 12 months or longer | shares	0	1
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 48	$ 39.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(0.9)	(0.3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	37.1	73.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (3.9)	$ (4.9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months | shares	20	15
Debt Securities, number of issues in loss position, 12 months or longer | shares	20	32
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 182.3	$ 26.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(4)	(0.8)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	430	684.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (46.4)	$ (62.4)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months | shares	47	13
Debt Securities, number of issues in loss position, 12 months or longer | shares	219	331
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 190.6	$ 15.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3.2)	(0.2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	272	306.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (42.2)	$ (37.8)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months | shares	111	15
Debt Securities, number of issues in loss position, 12 months or longer | shares	220	228
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 53.6	$ 53
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (4.2)	$ (6.4)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, 12 months or longer | shares	23	24
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 51.5	$ 24
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(0.8)	(0.1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	42	47
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (2.8)	$ (4.7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months | shares	25	15
Debt Securities, number of issues in loss position, 12 months or longer | shares	27	29
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 3.2	$ 80.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (0.2)	$ (0.7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, 12 months or longer | shares	2	21
Other Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 29.2	$ 12.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(0.2)	(0.1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2.5	10.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (0.2)	$ (0.6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months | shares	133	70
Debt Securities, number of issues in loss position, 12 months or longer | shares	20	58
Sovereign Debt Securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 9.5	$ 10.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (3.2)	$ (2.3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, 12 months or longer | shares	2	2

Investments, Net Realized Gains

Investments, Net Realized Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Realized Investment Gains (Losses) [Abstract]
Total gross realized gains	$ 5.2	$ 1.2	$ 44.4
Total gross realized losses	(13.2)	(16.5)	(19.6)
Net Decrease (Increase) Change in CECL Allowance [Abstract]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	1.6	1.8	(4.3)
Investments, Change in Net Unrealized Gains (Losses) [Abstract]
Change in Net Unrealized Gains (Losses)	34.9	103.1	(324.8)
Investments, Changes in Fair Value Reflected in Earnings [Abstract]
Net realized and unrealized gains (losses) on investments	24.1	22.7	(51.8)
Changes in Fair Value, Reflected in AOCI
AFS, change in unrealized gains (losses) on debt securities reflected in AOCI	4.4	66.9	(252.5)
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale [Abstract]
Proceeds from sale of fixed maturity securities	342.8	558	313.8
Debt Securities [Member]
Realized Investment Gains (Losses) [Abstract]
Debt Securities, Available-for-sale, Realized Gain	0.3	1	3.2
Debt Securities, Available-for-sale, Realized Loss	10.7	10.8	2.5
Net Decrease (Increase) Change in CECL Allowance [Abstract]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	1.6	1.8	(4.3)
Investments, Change in Net Unrealized Gains (Losses) [Abstract]
Change in Net Unrealized Gains (Losses)	4.4	66.9	(252.5)
Investments, Changes in Fair Value Reflected in Earnings [Abstract]
Net realized and unrealized gains (losses) on investments	(8.8)	(8)	(3.6)
Changes in Fair Value, Reflected in AOCI
AFS, change in unrealized gains (losses) on debt securities reflected in AOCI	4.4	66.9	(252.5)
Equity Securities [Member]
Realized Investment Gains (Losses) [Abstract]
Equity securities, FV-NI, realized gain	4.9	0.2	41.2
Equity securities, FV-NI, realized loss	(2.5)	(5.7)	(17.1)
Investments, Change in Net Unrealized Gains (Losses) [Abstract]
Change in Net Unrealized Gains (Losses)	23.8	32.5	(73.3)
Investments, Changes in Fair Value Reflected in Earnings [Abstract]
Net realized and unrealized gains (losses) on investments	26.2	27	(49.2)
Other Investments [Member]
Realized Investment Gains (Losses) [Abstract]
Gain on Sale of Investments	0	0	0
Loss on Sale of Investments	0	0	0
Investments, Change in Net Unrealized Gains (Losses) [Abstract]
Change in Net Unrealized Gains (Losses)	6.7	3.7	1
Investments, Changes in Fair Value Reflected in Earnings [Abstract]
Net realized and unrealized gains (losses) on investments	$ 6.7	$ 3.7	$ 1

Net Investment Income (Details)

Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 111.1	$ 110.2	$ 94.5
Investment expenses	(4.1)	(3.7)	(4.7)
Net investment income	107	106.5	89.8
Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income related to fixed maturity securities and short-term investments and cash equivalents	91.1	92.3	81.1
Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income related to equity securities	6.8	6.8	8.3
Other Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income related to fixed maturity securities and short-term investments and cash equivalents	4.9	3.8	2.8
Short-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income related to fixed maturity securities and short-term investments and cash equivalents	1.5	2.6	0.2
Cash and Cash Equivalents [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income related to fixed maturity securities and short-term investments and cash equivalents	$ 6.8	$ 4.7	$ 2.1

Investments Investments, held i

Investments Investments, held in Trust or on Deposit (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deposit Assets [Abstract]
Investments	$ 2,463.9	$ 2,278.1
Assets Held-in-trust [Abstract]
Funds held by or deposited with reinsurers	3	3
Federal Home Loan Bank [Member]
Deposit Assets [Abstract]
Letter of credit, maximum borrowing capacity	170	70
Required by various state laws and regulations to hold securities or letters of credit in depository account [Member]
Deposit Assets [Abstract]
Investments	$ 630.9	$ 748.1

Credit Losses (Details)

Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Credit Loss [Abstract]
Accrued investment income	$ 15.7	$ 16.3
Premium Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance of the allowance for CECL on premiums receivable	17.9	12.8
Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease)	23.9	17.3
Premium Receivable, Allowance for Credit Loss, Writeoff	(13.8)	(3.9)
Premium Receivable, Allowance for Credit Loss, Recovery	(8.8)	(8.3)
Ending balance of the allowance for CECL on premiums receivable	19.2	17.9
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]
Beginning balance of the allowance for CECL on reinsurance recoverables	0.9	0.9
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease)	0	0
Ending balance of the allowance for CECL on reinsurance recoverables	0.9	0.9
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Beginning balance of CECL on AFS investments	2.7	4.5
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	0.4	(0.1)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	(2)	(1.7)
Ending balance of CECL on AFS investments	$ 1.1	$ 2.7

Property and Equipment Property

Property and Equipment Property and Equipment breakout (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property and Equipment [Line Items]
Property and equipment, gross	$ 48.9	$ 48.6
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(41.1)	(42.1)
Property and equipment, net	7.8	6.5
Asset impairment and related charges	0	4.2	$ 0
Property, Plant and Equipment
Property and Equipment [Line Items]
Asset impairment and related charges		2.6
Software and Software Development Costs
Property and Equipment [Line Items]
Asset impairment and related charges		1.6
Furniture and equipment
Property and Equipment [Line Items]
Property and equipment, gross	1.8	1.8
Leasehold improvements
Property and Equipment [Line Items]
Property and equipment, gross	0.5	0.5
Computer and software
Property and Equipment [Line Items]
Property and equipment, gross	46.2	45.7
Automobiles
Property and Equipment [Line Items]
Property and equipment, gross	$ 0.4	$ 0.6

Cloud Computing Arrangements (D

Cloud Computing Arrangements (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Capitalized Computer Software, Net [Abstract]
Cloud computing arrangements	$ 17.3	$ 28

Property, Plant, and Equipment,

Property, Plant, and Equipment, Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Depreciation [Abstract]
Depreciation	$ 3.6	$ 4.8	$ 5.3
Payments to develop software	2.5	1.8
Amortization of cloud computing arrangements	$ 13.1	$ 16.7	$ 16.4

Exit and Disposal Cost (Details

Exit and Disposal Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Business Exit Costs		$ 7.6
Asset impairment and related charges	$ 0	4.2	$ 0
Other General Expense		0.2
Noncash operating lease term adjustment	$ 0	1	$ 0
Software and Software Development Costs
Restructuring Cost and Reserve [Line Items]
Asset impairment and related charges		1.6
Property, Plant and Equipment
Restructuring Cost and Reserve [Line Items]
Asset impairment and related charges		$ 2.6

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statutory federal tax rate	21%	21%	21%
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current federal tax expense (benefit)	$ 23.1	$ 23.7	$ 23.6
Current state and local tax expense (benefit)	0.8	1.5	1.1
Current income tax expense (benefit)	23.9	25.2	24.7
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred income tax expense (benefit)	4.2	5.1	(17.3)
Income Tax Expense (Benefit), Total	28.1	30.3	7.4
Net income	$ 118.6	118.1	$ 48.4
Minimum [Member]
Income Tax Examination, Year under Examination	2021
Maximum [Member]
Income Tax Examination, Year under Examination	2024
Change Due to Estimated Reserves Ceded Under the LPT Agreement [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Net income	$ (1.7)	(0.9)
Change to Contingent Profit Commission [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Net income	$ 0.4	$ 0.3

Income Taxes, Effective Tax Rat

Income Taxes, Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation [Line Items]
Expense computed at statutory rate	$ 30.8	$ 31.2	$ 11.7
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	0.6	1.1	0.9
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	(0.8)	(0.3)	(0.2)
Dividends received deduction and tax-exempt interest	(0.4)	(0.9)	(1.4)
LPT deferred gain amortization	(1.2)	(1.5)	(1.7)
Stock based compensation	0.8	0.9	0.8
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(1.1)	(0.1)	(0.9)
Income tax reconciliation, other	(0.6)	(0.1)	(0.4)
Income Tax Expense (Benefit), Total	$ 28.1	$ 30.3	$ 7.4
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21%	21%	21%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	0.40%	0.80%	1.50%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(0.50%)	(0.20%)	(0.40%)
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent	(0.30%)	(0.60%)	(2.50%)
Effective Income Tax Reconciliation LPT Agreement, Percent	(0.80%)	1%	3.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent	0.60%	0.60%	1.40%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent	(0.80%)	0%	(1.70%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(0.40%)	(0.20%)	(0.40%)
Effective Income Tax Rate Reconciliation, Percent, Total	19.20%	20.40%	13.30%
Accounting Standards Update 2018-05 [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Revaluation of deferred tax asset	$ 0	$ 0	$ (1.4)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0%	0%	(2.50%)

Income Taxes, Deferred Income T

Income Taxes, Deferred Income Tax Components (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities, Other Comprehensive Income	$ 4.3
Deferred policy acquisition cost	12.7	$ 11.9
Intangible assets	1.6	1.6
Deferred Tax Liabilities, Leasing Arrangements	0.8	1.1
Other deferred tax liabilities	9.7	6.1
Deferred Tax Liabilities, Gross, Total	29.1	20.7
Deferred Tax Assets [Abstract]
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss	0	3.1
Loss reserves discounting for tax reporting	31.4	31.2
Unearned premiums	15.8	14.9
Allowance for bad debt	4.2	4
Stock based compensation	1.6	1.6
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	4.2	4.9
Deferred Tax Asset, Leasing Arrangements	0.9	1.2
Other deferred tax assets	9.3	3.2
Deferred Tax Assets, Gross, Total	67.4	64.1
Deferred Tax Assets, Net, Total	$ 38.3	$ 43.4

Income Taxes, Unrecognized Tax

Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]
Beginning balance of unrecognized tax benefits	$ 0.6	$ 0.4	$ 0.3
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0.4	0	0.1
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	0.5	0.2	0.1
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	(0.1)	0	(0.1)
Ending balance of unrecognized tax benefits	1.4	0.6	0.4
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 0	$ 0	$ 0

Liability for Unpaid Losses a_3

Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Unpaid losses and LAE, gross of reinsurance, at beginning of period	$ 1,884.5	$ 1,960.7	$ 1,981.2
Loss reinsurance recoverable, excluding bad debt, on unpaid losses	428.4	445.4	476.9
Net unpaid losses and LAE at beginning of period	1,456.1	1,515.3	1,504.3
Losses and LAE, net of reinsurance, incurred in:
Current year	480.2	457.8	432.8
Prior Years	(18.4)	(44.9)	(33.5)
Total net losses and LAE incurred during the period	461.8	412.9	399.3
Deduct payments for losses and LAE, net of reinsurance, related to:
Current year	127.1	111.7	92.5
Prior years	395	360.4	295.8
Total net payments for losses and LAE during the period	522.1	472.1	388.3
Ending unpaid losses and LAE, net of reinsurance	1,395.8	1,456.1	1,515.3
Loss reinsurance recoverable, excluding bad debt, on unpaid losses	412.4	428.4	445.4
Unpaid losses and LAE, gross of reinsurance, at end of period	1,808.2	1,884.5	1,960.7
Voluntary risk business
Losses and LAE, net of reinsurance, incurred in:
Prior Years	(17.9)	(44.6)	(32.1)
Involuntary assigned risk business
Losses and LAE, net of reinsurance, incurred in:
Prior Years	$ (0.5)	$ (0.3)	$ (1.4)

Liability for Unpaid Losses a_4

Liability for Unpaid Losses and Loss Adjustment Expenses Historical Incurred Losses and LAE (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)		Dec. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)	[1]	Dec. 31, 2020 USD ($)	[1]	Dec. 31, 2019 USD ($)	[1]	Dec. 31, 2018 USD ($)	[1]	Dec. 31, 2017 USD ($)	[1]	Dec. 31, 2016 USD ($)	[1]	Dec. 31, 2015 USD ($)	[1]
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	$ 3,871.2
Cumulative paid losses and LAE, net of reinsurance	2,864.1
Liabilities for unpaid losses and LAE, net of reinsurance	1,329
Prior years	18.4	$ 44.9		$ 33.5
Involuntary assigned risk business
Claims Development [Line Items]
Prior years	0.5	0.3		1.4
Accident years prior to 2015
Claims Development [Line Items]
Cumulative paid losses and LAE, net of reinsurance	321.9
Accident Year 2015
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	370.4	374.9	[1]	381.9	[1]	$ 384.9		$ 396.7		$ 408.7		$ 419.6		$ 423.9		$ 425.8		$ 422.2
IBNR	$ 14.3
Cumulative number of reported claims	27,293
Cumulative paid losses and LAE, net of reinsurance	$ 340.9	337.6	[1]	333.7	[1]	329.3		322.2		311.2		290.5		246.9		174.5		$ 65.5
Accident year 2016
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	342.4	347.1	[1]	350.4	[1]	354.8		364.6		375		395.4		414.6		419
IBNR	$ 16.2
Cumulative number of reported claims	25,833
Cumulative paid losses and LAE, net of reinsurance	$ 309.2	302.3	[1]	298.1	[1]	290		278.3		261.2		227.7		166.8		$ 65.6
Accident year 2017
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	315.8	322.5	[1]	326.9	[1]	329.8		337.9		358.3		391.3		412.4
IBNR	$ 18.2
Cumulative number of reported claims	25,128
Cumulative paid losses and LAE, net of reinsurance	$ 283.5	277.1	[1]	269.5	[1]	260		243.7		215.7		160.2		$ 63.5
Accident Year 2018
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	400.8	400.5	[1]	400.5	[1]	400.6		407.7		424.6		422.5
IBNR	$ 22.8
Cumulative number of reported claims	28,028
Cumulative paid losses and LAE, net of reinsurance	$ 352.3	340.1	[1]	315.2	[1]	293.6		254.2		189.9		$ 77.9
Accident Year 2019
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	441.7	443.9	[1]	448.8	[1]	448.5		435.7		422.4
IBNR	$ 34.6
Cumulative number of reported claims	33,060
Cumulative paid losses and LAE, net of reinsurance	$ 374.5	354.4	[1]	325.8	[1]	285.2		212.6		$ 88.8
Accident Year 2020
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	364.4	366.9	[1]	373.3	[1]	374		365.7
IBNR	$ 27
Cumulative number of reported claims	24,320
Cumulative paid losses and LAE, net of reinsurance	$ 299.6	274.3	[1]	233.5	[1]	175.6		$ 71.9
Accident Year 2021
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	359.4	348.9	[1]	339	[1]	339.2
IBNR	$ 24.1
Cumulative number of reported claims	23,096
Cumulative paid losses and LAE, net of reinsurance	$ 277.5	231.2	[1]	166.8	[1]	$ 66.1
Accident Year 2022
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	400.7	400.7	[1]	399.3	[1]
IBNR	$ 48
Cumulative number of reported claims	23,559
Cumulative paid losses and LAE, net of reinsurance	$ 279	203.7	[1]	$ 76.5	[1]
Accident Year 2023
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	433.3	421.4	[1]
IBNR	$ 77.7
Cumulative number of reported claims	24,053
Cumulative paid losses and LAE, net of reinsurance	$ 240.7	$ 92.5	[1]
Short-Duration Insurance Contract, Accident Year 2024
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	442.3
IBNR	$ 188.6
Cumulative number of reported claims	21,615
Cumulative paid losses and LAE, net of reinsurance	$ 106.9
[1]Data presented for these calendar years is required supplementary information, which is unaudite

Liability for Unpaid Losses a_5

Liability for Unpaid Losses and Loss Adjustment Expenses Reconciliation of Claims Development to Aggregate Carrying Amount of the Liability for Unpaid Losses and LAE (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for unpaid losses and LAE, net of reinsurance	$ 1,329
Reinsurance recoverable on unpaid losses	412.4	$ 428.4	$ 445.4	$ 476.9
Unallocated LAE	66.8
Unpaid losses and loss adjustment expenses	$ 1,808.2	$ 1,884.5	$ 1,960.7	$ 1,981.2

Liability for Unpaid Losses a_6

Liability for Unpaid Losses and Loss Adjustment Expenses Short Duration Insurance Contracts, Historcial Claims Duration (Details)	Dec. 31, 2024
Average annual percentage payout of incurred claims by age, net of reinsurance
Year one	19.90%
Year two	29.80%
Year three	17.50%
Year four	10.50%
Year five	5.80%
Year six	4%
Year seven	2.40%
Year eight	1.50%
Year nine	1.60%
Year ten	0.90%

Reinsurance Reinsurance Premium

Reinsurance Reinsurance Premium Note (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Premiums Written, Net
Direct premiums, written	$ 767.8	$ 758.6	$ 705.3
Assumed premiums written	8.5	9.1	8.9
Gross premiums written	776.3	767.7	714.2
Ceded premiums written	(6.8)	(7.1)	(7)
Premiums written, net	769.5	760.6	707.2
Premiums Earned, Net
Direct premiums earned	747.8	719.9	673.2
Assumed premiums earned	8.5	9.1	9
Gross premiums, earned	756.3	729	682.2
Ceded premiums earned	(6.8)	(7.1)	(7)
Premiums earned, net	749.5	721.9	675.2
Policyholder Benefits and Claims Incurred, Ceded	$ 13.1	$ 17	$ 3.5

Reinsurance Excess of Loss (Det

Reinsurance Excess of Loss (Details) - Forecast [Member] $ in Millions	12 Months Ended
	Jun. 30, 2025 USD ($)
Effects of Reinsurance [Line Items]
Reinsurance, Excess Retention, Amount Reinsured, Per Event	$ 190
Reinsurance, Amount Retained, Per Policy	10
Reinsurance, Excess Retention, Amount Reinsured, Per Life	$ 20

Reinsurance LPT Agreement (Deta

Reinsurance LPT Agreement (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reinsurance Agreement [Line Items]
Unpaid losses		$ 411.5	$ 427.5
Recoverables was related to the LPT agreement		$ 277.1	291.7
Reinsurance quota share, percentage		100%
Ceded premiums written		$ 6.8	7.1	$ 7
Coverage provided under LPT agreement		2,000
Paid losses and LAE claims related to LPT		895.6
Amortization of deferred gain		5.2	6.9	8.3
Unpaid losses and loss adjustment expenses		1,808.2	1,884.5	$ 1,960.7	$ 1,981.2
LPT Agreement [Member]
Reinsurance Agreement [Line Items]
Liabilities for the incurred but unpaid losses and LAE related to claims prior to July 1, 1995		1,500
Ceded premiums written		$ 775
Change to Contingent Profit Commission [Member]
Reinsurance Agreement [Line Items]
Amortization of deferred gain	$ 0.4		$ 0.3

Credit Facility (Details)

Credit Facility (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 08, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Letters of Credit [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 25	$ 75
Line of Credit Facility, Commitment Fee Percentage		0.35%
Line of Credit Facility, Periodic Payment, Interest		$ 0.1	$ 0.5	$ 0.3
Line of Credit Facility, Covenant Terms		a debt to total capitalization ratio of no more than 35%, in each case as determined in accordance with the Credit Agreement	a debt to total capitalization ratio of no more than 35%
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		$ 0.2
Proceeds from (Repayments of) Lines of Credit				$ 10
Line of Credit Facility, Fair Value of Amount Outstanding			$ 0
Base Rate [Member]
Letters of Credit [Line Items]
Debt Instrument, Description of Variable Rate Basis		a base rate, defined as the higher of the Prime Rate, the Federal Funds Rate plus 1.25% and the Adjusted Term Secured Overnight Financing Rate (SOFR) for a one-month tenor plus 1.75%	base rate plus a specified margin, ranging from 0.25% to 1.25%
Debt Instrument, Basis Spread on Variable Rate		0.75%
Secured Overnight Financing Rate (SOFR) [Member]
Letters of Credit [Line Items]
Debt Instrument, Description of Variable Rate Basis		Adjusted Term SOFR Rate, defined as the applicable Adjusted Term SOFR Rate plus 1.75%	Adjusted Term SOFR rate plus a specified margin, ranging from 1.25% to 2.25%
Debt Instrument, Basis Spread on Variable Rate		1.75%
Forecast [Member]
Letters of Credit [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.30%
Forecast [Member] | Base Rate [Member]
Letters of Credit [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Forecast [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Letters of Credit [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Minimum [Member]
Letters of Credit [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.30%	0.20%
Debt Instrument, Covenant Description		a minimum consolidated net worth, defined as EHI’s total stockholders’ equity excluding any accumulated other comprehensive income or loss, of no less than $800.0 million	a minimum consolidated net worth
Maximum [Member]
Letters of Credit [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 35
Line of Credit Facility, Commitment Fee Percentage		0.55%	0.50%

FHLB Advances (Details)

FHLB Advances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Proceeds from FHLB advances	$ 0	$ 0	$ 182.5
Payments for FHLBank Advance, Investing Activities		$ 182.5
Federal Home Loan Bank, Advances, Weighted Average Interest Rate		5.11%	2.65%
Interest Expense, Loans from Other Federal Home Loan Banks		$ 5.3	$ 3	$ 2.3

Letters of Credit (Details)

Letters of Credit (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 08, 2025	Dec. 31, 2024	Dec. 31, 2023
Letters of Credit [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.35%
Forecast [Member]
Letters of Credit [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.30%
Maximum [Member]
Letters of Credit [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.55%	0.50%
Minimum [Member]
Letters of Credit [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.30%	0.20%
Federal Home Loan Bank [Member]
Letters of Credit [Line Items]
Letter of credit, maximum borrowing capacity		$ 170	$ 70
Letter of credit, expiration date		Mar. 31, 2025
Letter of credit, unused capacity, commitment fee percentage		15%
Letter of credit collateral amount		$ 284.7	286.4
Federal Home Loan Bank [Member] | EAC
Letters of Credit [Line Items]
Letter of credit, maximum borrowing capacity		25
Federal Home Loan Bank [Member] | ECIC
Letters of Credit [Line Items]
Letter of credit, maximum borrowing capacity		35
Federal Home Loan Bank [Member] | EPIC
Letters of Credit [Line Items]
Letter of credit, maximum borrowing capacity		$ 110	$ 10

Commitments and Contingencies O

Commitments and Contingencies Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Operating Lease, Expense	$ 1.1	$ 1.6
Finance Lease Expense	0.1	0.2
Lease, Cost	$ 1.2	1.8
Operating Lease, Weighted Average Remaining Lease Term	3 years 2 months 12 days
Finance Lease, Weighted Average Remaining Lease Term	1 year 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	1.30%
Finance Lease, Weighted Average Discount Rate, Percent	7.30%
Operating lease right-of-use assets	$ 3.7	5.1
Operating lease liability	4.2	5.9
Property and equipment, gross	0.4	0.6
Accumulated depreciation, depletion and amortization, property and equipment	0.3	0.4
Property and equipment, net	0.1	0.2
Other liabilities	$ 0.1	$ 0.2
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	5 years
Lessee, Operating Lease, remaining lease term	5 years
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Finance Lease, Term of Contract	1 year
Lessee, Operating Lease, remaining lease term	1 year

Commitments and Contingencies F

Commitments and Contingencies Future Lease Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Operating Leases, Future Minimum Payments Due [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 1.5
Lessee, Operating Lease, Liability, to be Paid, Year Two	1.2
Lessee, Operating Lease, Liability, to be Paid, Year Three	1.2
Lessee, Operating Lease, Liability, to be Paid, Year Four	0.4
Lessee, Operating Lease, Liability, to be Paid, Year Five	0
Lessee, Operating Lease, Liability, to be Paid, after Year Five	0
Lessee, Operating Lease, Liability, to be Paid, Total	4.3
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(0.1)
Operating Lease Liability	4.2	$ 5.9
Finance Lease, Liability, Payment, Due [Abstract]
Finance Lease, Liability, to be Paid, Year One	0.1
Finance Lease, Liability, to be Paid, Year Two	0
Finance Lease, Liability, to be Paid, Year Three	0
Finance Lease, Liability, to be Paid, Year Four	0
Finance Lease, Liability, to be Paid, Year Five	0
Finance Lease, Liability, to be Paid, after Year Five	0
Finance Lease, Liability, to be Paid, Total	0.1
Finance Lease, Liability, Undiscounted Excess Amount	0
Finance Lease Liability	$ 0.1	$ 0.2

Commitments and Contingencies L

Commitments and Contingencies Leases, Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Operating Lease, Payments	$ 1.1	$ 1.6
Finance Lease, Interest Payment on Liability	$ 0.1	$ 0.2

Lease Exit and Disposal Costs (

Lease Exit and Disposal Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Business Exit Costs		$ 7.6
Asset impairment and related charges	$ 0	4.2	$ 0
Other General Expense		0.2
Noncash operating lease term adjustment	$ 0	1	$ 0
Software and Software Development Costs
Restructuring Cost and Reserve [Line Items]
Asset impairment and related charges		1.6
Property, Plant and Equipment
Restructuring Cost and Reserve [Line Items]
Asset impairment and related charges		$ 2.6

Commitments and Contingencies C

Commitments and Contingencies Contingencies Surrounding Insurance Assessments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Amount of Insurance-related assessment liability	$ 12.2	$ 13
Payment period for assessment liability based on individual states regulations	one year
Other assets, prepaid policy surcharges	$ 11.2	$ 12.5
Expected realization period for assets related to policy surcharges	one to ten year periods

Commitments and Contingencies_2

Commitments and Contingencies Capital Commitment (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Capital Commitment [Abstract]
Unfunded commitment, private investment fund	$ 15.6	$ 25.4

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($)	12 Months Ended	17 Months Ended	216 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2024	Jun. 10, 2024	Dec. 31, 2023	Jul. 26, 2023
Accelerated Share Repurchases [Line Items]
Share Repurchase Program, Authorized, Amount						$ 50,000,000
Share Repurchase Program, Authorized, Amount, Additional				$ 50,000,000
Share Repurchase Program, Authorized, Total Amount	$ 100,000,000	$ 100,000,000	$ 100,000,000
Share Repurchase Program, Expiration Date	Jul. 31, 2025
Accelerated share repurchases, final price paid per share		$ 41.58	$ 22.17
Stock repurchased during period, shares		1,694,483	33,628,155
Stock Repurchased During Period, Value		$ 70,500,000
Share Repurchase Program, Excise Tax, Payable	$ 300,000	$ 300,000	$ 300,000		$ 700,000
Share Repurchase Program, Excise Tax	$ 0.01

Stock-Based Compensation Expens

Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares reserved for grants	6,555,000
Stock-based compensation expense [Abstract]
Stock-based compensation expense	$ 6.2	$ 6.1	$ 4.9
Less: related tax benefit	1.3	1.3	1
Net stock-based compensation expense	$ 4.9	4.8	3.9
Minimum Percentage of Shares Subject to Forfeiture	0%
Maximum Percentage of Shares Subject to Forfeiture	15%
Restricted stock units (RSUs)
Stock-based compensation expense [Abstract]
Stock-based compensation expense	$ 3.2	3.5	2.6
Performance shares units [Member]
Stock-based compensation expense [Abstract]
Stock-based compensation expense	$ 3	$ 2.6	$ 2.3

Stock-Based Compensation Fair M

Stock-Based Compensation Fair Market Value of Stock Options Granted, Calculated (Details) - shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options or share units, granted	0	0	0

Stock-Based Compensation Change

Stock-Based Compensation Changes in Outstanding Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding options or share units	0	0	23,500	65,165
Stock-options exercised, shares		(23,500)	(41,665)
Weighted average exercise price, outstanding		$ 0	$ 27.72	$ 25.96
Weighted average exercise price, exercises		$ 27.72	$ 24.97
Weighted average remaining contractual life		0 years	2 months 12 days	8 months 12 days
Options outstanding, intrinsic value	$ 0	$ 0	$ 0.4
Options exercisable, intrinsic value	0	0	0.4
Options exercised, intrinsic value		0.4	0.7
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, deferred	$ 5.4
Share-based compensation expense, Period for Recognition	39 months
Service vesting period for options awarded	4 years
Vesting rights for options awarded	vest 25% on or after each of the subsequent four anniversaries of such date
Grant Date FV of RSUs Vested	$ 3.4	3.8	1.9
Intrinsic Value of RSUs Vested	4	4.4	2.1
Intrinsic Value of Outstanding RSUs	$ 11	$ 9.1	$ 11.1
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
RSUs, Outstanding, Number, Beginning Balance	230,822	257,313	198,126
RSUs Granted	89,783	112,114	124,042
RSUs Forfeited	18,251	27,447	13,728
RSUs Vested	(88,062)	(111,158)	(51,127)
RSUs, Nonvested, Number, Ending Balance	214,292	230,822	257,313	198,126
RSUs Outstanding Weighted Average Grant Date Fair Value	$ 41.40	$ 38.84	$ 36.28	$ 34.53
RSUs Grants Weighted Average Grant Date Fair Value	45.33	40.05	39.90
RSUs Forfeiture Weighted Average Grant Date Fair Value	42.16	40.06	38.45
RSUs Outstanding Weighted Average Grant Date Fair Value	$ 38.59	$ 33.83	$ 37.69
Restricted Stock Units Vested but Unsettled [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number	31,553
Weighted average grant date fair value	$ 35.46

Stock-Based Compensation Perfor

Stock-Based Compensation Performance Share Awards (Details) - USD ($) $ / shares in Units, $ in Millions										12 Months Ended
		Feb. 26, 2024		Apr. 25, 2023		Mar. 15, 2023		Mar. 15, 2022		Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share awards, expected target										100%	130%
Performance shares units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, deferred										$ 4.3
Share-based compensation expense, Period for Recognition										24 months	12 months
Officer [Member] | Performance shares units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service vesting period for options awarded								1 year
Fair value of awards awarded on grant date						$ 3.4	[1]	$ 3	[2]
PSUs Grants Weighted Average Grant Date Fair Value		$ 46.36	[1]	$ 42.34	[1]	$ 41.14	[1]	$ 40.54	[2]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period		77,360	[1]	1,220	[1]	81,800	[1]	73,120	[2]
Performance share awards, minimum payout										0%	0%
Performane share awards, maximum payout										250%	250%
Performance Share Awards Performance Period		three years		three years		three years		two years,
Management | Performance shares units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards awarded on grant date	[1]	$ 3.6		$ 0.1
[1] The PSUs awarded in March 2023, April 2023, and February 2024 have a performance period of three years. These PSU awards are subject to certain performance goals with payouts that range from 0% to 250% of the target awards. The values shown in the table represent the aggregate number of PSUs awarded at the target level. The PSUs awarded in March 2022, had a performance period of two years, followed by an additional one year vesting period. These awards were subject to certain performance goals with payouts that ranged from 0% to 250% of the target awards. The actual performance goal achieved was determined to be 59% of target in February 2024. The values shown in the table represent the aggregate number of PSUs that were originally awarded at the target level.

Statutory Matters Statutory Mat

Statutory Matters Statutory Matters (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Sep. 20, 2025	Jul. 15, 2025	Mar. 26, 2025	Mar. 18, 2025
Statutory Accounting Practices [Line Items]
Capital stock and unassigned surplus	$ 776.7	$ 739.7
Paid in capital	243.2	243.2
Total statutory surplus	1,019.9	982.9
SAP, net income amount	92.1	96.2	$ 105.1
Total stockholders’ equity	1,068.7	$ 1,013.9
EICN
Statutory Accounting Practices [Line Items]
Capital stock and unassigned surplus	$ 259.1
Extraordinary dividends, approves or does not disapprove the payment within	30 days
Percentage of statutory surplus as regards to policyholders at the next preceding December 31.	10%
Dividends paid, without approval of regulatory agency	$ 13.7
EICN | Forecast [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval						$ 14
ECIC
Statutory Accounting Practices [Line Items]
Percentage of statutory surplus as regards to policyholders at the next preceding December 31.	10%
Percentage of Net Income	100%
Dividends paid, without approval of regulatory agency	$ 23.3
ECIC | Forecast [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval							$ 23.5
EPIC
Statutory Accounting Practices [Line Items]
Dividends paid, without approval of regulatory agency	23.2
EPIC | Forecast [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval					$ 23.9
EAC
Statutory Accounting Practices [Line Items]
Dividends paid, without approval of regulatory agency	22.4
EAC | Forecast [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval					$ 23.6
EAC and EPIC
Statutory Accounting Practices [Line Items]
Total statutory surplus	$ 4
Percentage of surplus used to calculate the lesser of 10% of surplus or net income, not including realized capital gains, plus a 2-year carry forward.	10%
Percentage of surplus used to calculate 10% of surplus, with dividends payable limited to unassigned funds minus 25% of unrealized capital gains	10%
Percentage of surplus used to calculate the lesser of 10% of surplus or net investment income plus a 3-year carry forward with dividends payable limited to unassigned funds minus 25% of unrealized capital gains	10%
Percentage of unassigned gains used to calculate 10% of surplus, with dividends payable limited to unassigned funds minus 25% of unrealized capital gains	25%
Percentage of unassigned gains used to calculate the lesser of 10% of surplus or net investment income plus a 3-year carry forward with dividends payable limited to unassigned funds minus 25% of unrealized capital gains	25%
Florida statute section 624.408 requires EPIC and EAC to maintain minimum capital and surplus of the greater of $4.0 million or 10% of total liabilities.	10%
Used to calculate ratio of written premium to surplus	1.25
Net gross premiums to surplus ratio. Florida statute section 624.4095 requires net gross premiums times 1.25 not exceed this ratio.	10-to-1
Net written premiums to surplus ratio. Florida statute section 624.4095 requires net written premiums times 1.25 not exceed this ratio.	4-to-1
CIC
Statutory Accounting Practices [Line Items]
Percentage of statutory surplus as regards to policyholders at the next preceding December 31.	10%
Dividends paid, without approval of regulatory agency	$ 5.7
net investment income, Percentage Of	100%
CIC | Forecast [Member]
Statutory Accounting Practices [Line Items]
Maximum dividends that may be paid without prior approval				$ 5.9

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income, Net (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax	$ (104.5)	$ (108.9)
Deferred tax expense	22	22.9
Total accumulated other comprehensive income, net	$ (82.5)	$ (86)

Employee Benefit and Retireme_2

Employee Benefit and Retirement Plans Employee Benefit and Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Benefit and Retirement Plans [Abstract]
Safe habor matching, 100%	100%
Employee contributions, 100% match, percentage	3%
Safe harbor matching 50%	50%
Employee contributions 50% match, percentage	3%
Employee contributions, maximum match, percentage	5%
Company's contributions to Employers 401(k)	$ 2.5	$ 2.3	$ 2

Earnings Per Share Earnings Per

Earnings Per Share Earnings Per Share (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income	$ 118.6	$ 118.1	$ 48.4
Weighted average number of shares outstanding - basic	25,050,605	26,368,801	27,503,941
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	144,209	154,850	177,047
Weighted average number of shares outstanding - diluted	25,194,814	26,523,651	27,680,988
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	20,518	22,395	0
Stock Options [Member]
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	2,072	11,256
Performance shares units [Member]
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	86,920	110,342	131,465
Restricted stock units (RSUs)
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	57,289	42,436	34,326

Segments Segment Net Income Bef

Segments Segment Net Income Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross premiums written	$ 776.3	$ 767.7	$ 714.2
Premiums Written, Net	769.5	760.6	707.2
Net premiums earned	749.5	721.9	675.2
Net investment income	107	106.5	89.8
Net realized and unrealized gains (losses) on investments	24.1	22.7	(51.8)
Other income (loss)	0.1	(0.2)	0.3
Total revenues	880.7	850.9	713.5
Losses and loss adjustment expenses	456.2	405.7	391
Commission expense	101.2	100	95.9
Compensation-related expenses	108.9	109.2	96.6
Communications and Information Technology	12	12.8	12.5
Professional fees	19.3	22.1	18.2
Depreciation	16.7	21.5	21.7
Other underwriting and general and administrative expenses	9.4	12.6	14
AO and other expense allocations, other underwriting expense	(48)	(46.5)	(38.8)
Premium taxes and assessments, other underwriting expense	29.5	27.9	28.4
Policyholder dividends	11.2	10.3	7.7
Bad debt expense, other underwriting expense	17.5	10.1	7
Interest and financing expenses	0.1	5.8	3.5
Other Expenses		11
Total expenses	734	702.5	657.7
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	146.7	148.4	55.8
Income tax expense	28.1	30.3	7.4
Net income	$ 118.6	$ 118.1	$ 48.4
Combined Ratio	98.70%	96%	98.10%
Insurance Operations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross premiums written	$ 776.3	$ 767.7	$ 714.2
Premiums Written, Net	769.5	760.6	707.2
Net premiums earned	749.5	721.9	675.2
Net investment income	107	106.5	89.8
Net realized and unrealized gains (losses) on investments	24.1	22.7	(51.8)
Other income (loss)	0.1	(0.2)	0.3
Total revenues	880.7	850.9	713.5
Losses and loss adjustment expenses	456.2	405.7	391
Commission expense	101.2	100	95.9
Compensation-related expenses	108.9	109.2	96.6
Communications and Information Technology	12	12.8	12.5
Professional fees	19.3	22.1	18.2
Depreciation	16.7	21.5	21.7
Other underwriting and general and administrative expenses	9.4	12.6	14
AO and other expense allocations, other underwriting expense	(48)	(46.5)	(38.8)
Premium taxes and assessments, other underwriting expense	29.5	27.9	28.4
Policyholder dividends	11.2	10.3	7.7
Bad debt expense, other underwriting expense	17.5	10.1	7
Interest and financing expenses	0.1	5.8	3.5
Other Expenses	0	11	0
Total expenses	734	702.5	657.7
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	146.7	148.4	55.8
Income tax expense	28.1	30.3	7.4
Net income	$ 118.6	$ 118.1	$ 48.4
Combined Ratio	98.70%	96%	98.10%

Segments Geographic Information

Segments Geographic Information (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
CALIFORNIA
Revenue, Major Customer [Line Items]
Premiums In Force	$ 336.1	$ 311.5	$ 279.7
Policies In force	44,540	43,353	42,876
FLORIDA
Revenue, Major Customer [Line Items]
Premiums In Force	$ 60.1	$ 56.6	$ 49.4
Policies In force	10,943	10,008	9,417
NEW YORK
Revenue, Major Customer [Line Items]
Premiums In Force	$ 36.1	$ 31.9	$ 27.3
Policies In force	7,938	7,603	7,497
All Other States
Revenue, Major Customer [Line Items]
Premiums In Force	$ 309.8	$ 294.6	$ 266.1
Policies In force	67,346	65,445	61,566
UNITED STATES
Revenue, Major Customer [Line Items]
Premiums In Force	$ 742.1	$ 694.6	$ 622.5
Policies In force	130,767	126,409	121,356
Final audit premium	$ 26.1	$ 14.8	$ 31.5
Total in-force, including final audit premium	$ 768.2	$ 709.4	$ 654
Total in-force policies, includingfinal audit	130,767	126,409	121,356
Final audit policies in-force	0	0	0

Schedule II. Condensed Financ_2

Schedule II. Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments
Fixed maturity securities at fair value (amortized cost $23.8 at December 31, 2024 and $1.3 at December 31, 2023)	$ 2,097.4	$ 1,936.3
Short-term investments at fair value (amortized cost $0.0 at December 31, 2024)	0.1	33.1
Investments	2,463.9	2,278.1
Cash and cash equivalents	68.3	226.4
Accrued investment income	15.7	16.3
Deferred Income Tax Assets, Net	38.3	43.4
Other assets	37.6	33.6
Total assets	3,541.3	3,550.4
Liabilities and stockholders' equity
Accounts payable and accrued expenses	21.2	26.1
Other liabilities	63.2	58.1
Total liabilities	2,472.6	2,536.5
Stockholders' equity:
Common stock, $0.01 par value; 150,000,000 shares authorized; 58,184,861 and 58,055,968 shares issued and 24,556,706 and 25,369,753 shares outstanding at December 31, 2024 and 2023, respectively	0.6	0.6
Preferred stock, $0.01 par value; 25,000,000 shares authorized; none issued	0	0
Additional paid-in capital	424.2	419.8
Retained earnings	1,472.9	1,384.3
Accumulated other comprehensive loss, net of tax	(82.5)	(86)
Treasury stock, at cost (33,628,155 shares at December 31, 2024 and 32,686,215 shares at December 31, 2023)	(746.5)	(704.8)
Total stockholders’ equity	1,068.7	1,013.9
Total liabilities and stockholders’ equity	3,541.3	3,550.4
Parent Company [Member]
Investments
Investment in subsidiaries	1,006.7	972.4
Fixed maturity securities at fair value (amortized cost $23.8 at December 31, 2024 and $1.3 at December 31, 2023)	23.8	1.3
Equity securities at fair value (cost $26.2 at December 31, 2024 and $26.2 at December 31, 2023)	24.5	24.2
Investments	1,055	997.9
Cash and cash equivalents	9.8	20.3	$ 37.3	$ 4.8
Accrued investment income	0.1	0.1
Accounts Receivable, after Allowance for Credit Loss, Current	0.3	0.4
Federal income taxes receivable	4.3	0
Deferred Income Tax Assets, Net	2	1.9
Other assets	0.7	0.3
Total assets	1,072.2	1,020.9
Liabilities and stockholders' equity
Accounts payable and accrued expenses	2.8	6.5
Intercompany payable	0.7	0
Other liabilities	0	0.5
Total liabilities	3.5	7
Stockholders' equity:
Common stock, $0.01 par value; 150,000,000 shares authorized; 58,184,861 and 58,055,968 shares issued and 24,556,706 and 25,369,753 shares outstanding at December 31, 2024 and 2023, respectively	0.6	0.6
Additional paid-in capital	424.2	419.8
Retained earnings	1,472.9	1,384.3
Accumulated other comprehensive loss, net of tax	(82.5)	(86)
Treasury stock, at cost (33,628,155 shares at December 31, 2024 and 32,686,215 shares at December 31, 2023)	(746.5)	(704.8)
Total stockholders’ equity	1,068.7	1,013.9
Total liabilities and stockholders’ equity	$ 1,072.2	$ 1,020.9

Schedule II. Condensed Financ_3

Schedule II. Condensed Financial Information of Registrant (Condensed Balance Sheets Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fixed maturity securities, amortized cost	$ 2,203.1	$ 2,048
Equity securities, cost	145	125.9
Short-term investments, amortized cost	$ 0.1	$ 33.1
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	58,184,861	58,055,968
Common stock, shares outstanding (in shares)	24,556,706	25,369,753
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Treasury Stock, Common, Shares	33,628,155	32,686,215
Parent Company [Member]
Fixed maturity securities, amortized cost	$ 23.8	$ 1.3
Equity securities, cost	26.2	26.2
Short-term investments, amortized cost	0	0
Short-term Investments [Member]
Fixed maturity securities, amortized cost	$ 0.1	$ 33.1

Schedule II. Condensed Financ_4

Schedule II. Condensed Financial Information of Registrant (Condensed Statements of Income) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Net investment income	$ 107	$ 106.5	$ 89.8
Net realized and unrealized gains (losses) on investments	24.1	22.7	(51.8)
Total revenues	880.7	850.9	713.5
Expenses
Underwriting and general and administrative expenses	176.5	180	167.3
Interest and financing expenses	0.1	5.8	3.5
Total expenses	734	702.5	657.7
Income tax expense	28.1	30.3	7.4
Net income	$ 118.6	$ 118.1	$ 48.4
Earnings per common share for the stated periods (Note 17):
Basic	$ 4.73	$ 4.48	$ 1.76
Diluted	4.71	4.45	1.75
Cash dividends declared per common share and eligible equity plan awards	$ 1.18	$ 1.10	$ 3.28
Parent Company [Member]
Revenues
Net investment income	$ 3.1	$ 3.7	$ 3.6
Net realized and unrealized gains (losses) on investments	0.3	1.2	(6.5)
Total revenues	3.4	4.9	(2.9)
Expenses
Underwriting and general and administrative expenses	10	12.1	13.5
Interest and financing expenses	0.1	0.4	0.5
Total expenses	10.1	12.5	14
Loss before income taxes and equity in earnings of subsidiaries	(6.7)	(7.6)	(16.9)
Income tax expense	(2.1)	(1.3)	(3.4)
Net loss before equity in earnings of subsidiaries	(4.6)	(6.3)	(13.5)
Equity in earnings of subsidiaries	123.2	124.4	61.9
Net income	$ 118.6	$ 118.1	$ 48.4
Earnings per common share for the stated periods (Note 17):
Basic	$ 4.73	$ 4.48	$ 1.76
Diluted	4.71	4.45	1.75
Cash dividends declared per common share and eligible equity plan awards	$ 1.18	$ 1.10	$ 3.28

Schedule II. Condensed Financ_5

Schedule II. Condensed Financial Information of Registrant (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities
Net income	$ 118.6	$ 118.1	$ 48.4
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Realized gains on investments	(24.1)	(22.7)	51.8
Stock-based compensation	6.3	6.2	5.1
Amortization of discounts and premiums on investments, net	(1)	2.4	3
Deferred income tax expense	4.2	5.1	(17.3)
Change in operating assets and liabilities:
Accounts payable, accrued expenses and other liabilities	3.3	3.7	7.2
Federal income taxes	(8.4)	(6.7)	8.8
Other	(2.5)	10.4	5.2
Net cash provided by (used in) operating activities	76.4	49.4	99.8
Investing activities
Purchases of fixed maturity securities	(722.4)	(416.4)	(611.4)
Purchase of equity securities	(61.4)	(39.8)	(124.9)
Purchases of short-term investments	(39.8)	(68.7)	(132.7)
Proceeds from sale of equity securities	45	53.2	216.3
Proceeds from sale of fixed maturity securities	342.8	558	313.8
Proceeds from maturities and redemptions of fixed maturity securities	214.7	162.7	195
Net change in unsettled investment purchases and sales	1.6	1.6	(3.3)
Net cash (used in) provided by investing activities	(159.7)	377.3	(146.1)
Financing activities
Acquisition of common stock and excise tax payments	(42.6)	(76.1)	(30.4)
Cash transactions related to stock-based compensation	(1.8)	(1)	(1.2)
Dividends paid to stockholders	(30.3)	(29.7)	(90.3)
Proceeds from Lines of Credit	0	0	10
Purchase of Notes Payables	0	0	(10)
Net cash used in financing activities	(74.8)	(289.5)	60.4
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(158.1)	137.2	14.1
Cash and cash equivalents at the beginning of the period	226.4
Cash and cash equivalents at the end of the period	68.3	226.4
Parent Company [Member]
Operating activities
Net income	118.6	118.1	48.4
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in net income of subsidiaries	30.9	45.7	(117.6)
Realized gains on investments	(0.3)	(1.2)	6.5
Stock-based compensation	6.3	6.2	5.1
Amortization of discounts and premiums on investments, net	0	0	0.1
Deferred income tax expense	(0.1)	1.1	(0.5)
Change in operating assets and liabilities:
Accounts payable, accrued expenses and other liabilities	(2.6)	(0.2)	0.8
Federal income taxes	(4.8)	(7.8)	9.8
Other assets	(0.3)	0.5	0.2
Intercompany payable/receivable	0.8	(0.9)	0.6
Other	0	0	(0.1)
Net cash provided by (used in) operating activities	86.7	70.1	188.5
Investing activities
Purchases of fixed maturity securities	(26.7)	0	(14.7)
Purchase of equity securities	0	0	(40.2)
Purchases of short-term investments	0	(18.6)	(24.7)
Proceeds from sale of equity securities	0	10	25.5
Proceeds from sale of fixed maturity securities	4.2	6.6	16
Proceeds from maturities of short-term investments	0	39.3	4
Capital Contributions to subsidiary	0	(17.6)	0
Net cash (used in) provided by investing activities	(22.5)	19.7	(34.1)
Financing activities
Acquisition of common stock and excise tax payments	(42.6)	(76.1)	(30.4)
Cash transactions related to stock-based compensation	(1.8)	(1)	(1.2)
Dividends paid to stockholders	(30.3)	(29.7)	(90.3)
Proceeds from Lines of Credit	0	0	10
Purchase of Notes Payables	0	0	(10)
Net cash used in financing activities	(74.7)	(106.8)	(121.9)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(10.5)	(17)	32.5
Cash and cash equivalents at the beginning of the period	20.3	37.3	4.8
Cash and cash equivalents at the end of the period	$ 9.8	$ 20.3	$ 37.3

Schedule VI. Supplemental Inf_2

Schedule VI. Supplemental Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	$ 59.6	$ 55.6
Unpaid losses and loss adjustment expenses	1,808.2	1,884.5	$ 1,960.7	$ 1,981.2
Unearned premiums	402.2	379.7
Net premiums earned	749.5	721.9	675.2
Net investment income	107	106.5	89.8
Current year	480.2	457.8	432.8
Prior Years	(18.4)	(44.9)	(33.5)
Deferred policy acquisition cost, amortization expense	119.6	113.8	106.4
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	522.1	472.1	388.3
Premiums Written, Net	769.5	760.6	707.2
Insurance Operations [Member]
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	59.6	55.6	48.3
Unpaid losses and loss adjustment expenses	1,808.2	1,884.5	1,960.7
Unearned premiums	402.2	379.7	339.5
Net premiums earned	749.5	721.9	675.2
Net investment income	107	106.5	89.8
Current year	480.2	457.8	432.8
Prior Years	(24)	(52.1)	(41.8)
Deferred policy acquisition cost, amortization expense	119.6	113.8	106.4
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	516.5	464.9	380
Premiums Written, Net	$ 769.5	$ 760.6	$ 707.2