Employers (EIG) 10-K 24 Feb 23 2022 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 21, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
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			$ 833,617,786
Entity Common Stock Shares Outstanding (in shares)		27,135,006
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	10375 Professional Circle
Entity Address, City or Town	Reno,
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89521
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 2023 Annual Meeting of Stockholders are incorporated by reference in Items 11, 12, 13 and 14 of Part III of this report.

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
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, 2022	Dec. 31, 2021
Investments:
Fixed maturity securities at fair value (amortized cost $2,366.7 at December 31, 2022 and $2,266.3 at December 31, 2021, less CECL allowance of $4.5 at December 31, 2022 and $0.2 at December 31, 2021)	$ 2,186.3	$ 2,342.7
Equity securities at fair value (cost $144.2 at December 31, 2022 and $212.6 at December 31, 2021	197	338.8
Federal Home Loan Bank Stock	6.7	5.6
Other invested assets (cost $54.4 at December 31, 2022 and $34.1 at December 31, 2021)	59.7	38.4
Short-Term Investments	119.1	10.5
Total investments	2,568.8	2,736
Cash and cash equivalents	89.2	75.1
Restricted cash and cash equivalents	0.2	0.2
Accrued investment income	19	14.5
Premiums receivable (less CECL allowance of $12.8 at December 31, 2022 and $10.3 at December 31, 2021)	305.9	244.7
Reinsurance recoverable for:
Paid losses	6.8	7.5
Unpaid losses (less CECL allowance of $0.9 at December 31, 2022 and $0.6 at December 31, 2021)	444.5	476.3
Deferred policy acquisition costs	48.3	43.7
Deferred Income Tax Assets, Net	62.7	0
Property and equipment, net	12	14.7
Operating lease right-of-use assets	11.5	14.2
Intangible assets, net	13.6	13.6
Goodwill	36.2	36.2
Contingent commission receivable–LPT Agreement	13.9	13.9
Cloud computing arrangements	42.9	43.9
Other assets	41.2	48.7
Total assets	3,716.7	3,783.2
Liabilities and stockholders' equity
Unpaid losses and loss adjustment expenses	1,960.7	1,981.2
Unearned premiums	339.5	304.7
Commissions and premium taxes payable	58.2	42.1
Accounts payable and accrued expenses	28.7	24.1
Deferred reinsurance gain—LPT Agreement	106.1	114.4
Deferred Income Tax Liabilities, Net	0	7.7
FHLB advances	182.5	0
Non-cancellable obligations	26.1	21.7
Operating lease liability	13.6	16.6
Other liabilities	57.1	57.6
Total liabilities	2,772.5	2,570.1
Commitments and contingencies (Note $12)
Stockholders' equity:
Common stock, $0.01 par value; 150,000,000 shares authorized; 57,876,287 and 57,690,254 shares issued and 27,160,748 and 27,741,400 shares outstanding at December 31, 2022 and 2021, respectively	0.6	0.6
Preferred stock, $0.01 par value; 25,000,000 shares authorized; none issued	0	0
Additional paid-in capital	414.6	410.7
Retained earnings	1,295.6	1,338.5
Accumulated other comprehensive (loss) income, net of tax	(138.9)	60.6
Treasury stock, at cost (30,715,539 shares at December 31, 2022 and 29,948,854 shares at December 31, 2021)	(627.7)	(597.3)
Total stockholders' equity	944.2	1,213.1
Total liabilities and stockholders' equity	$ 3,716.7	$ 3,783.2

Consolidated Balance Sheets Par

Consolidated Balance Sheets Parentheticals - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Parentheticals [Abstract]
Fixed maturity securities, amortized cost	$ 2,366.7	$ 2,266.3
Debt Securities, Available-for-sale, Allowance for Credit Loss	4.5	0.2
Equity securities, cost	144.2	212.6
Other Investments, at Cost	54.4	34.1
Short-term investments, amortized cost	119.1	10.5
Premium Receivable, Allowance for Credit Loss	12.8	10.3
Reinsurance Recoverable, Allowance for Credit Loss	$ 0.9	$ 0.6
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)	57,876,287	57,690,254
Common stock, shares outstanding (in shares)	27,160,748	27,741,400
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, at cost (in shares)	30,715,539	29,948,854

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Net premiums earned	$ 675.2	$ 574.4	$ 615.3
Net investment income	89.8	72.7	76.3
Net realized and unrealized (losses) gains on investments	(51.8)	54.6	19
Other income	0.3	1.4	0.8
Total revenues	713.5	703.1	711.4
Expenses
Losses and loss adjustment expenses	391	315.2	302.4
Commission expense	95.9	76.1	78.8
Underwriting and general and administrative expenses	167.3	160.2	181.3
Interest and financing expenses	3.5	0.5	0.4
Other expenses	0	4.1	0.8
Total expenses	657.7	556.1	563.7
Net income before income taxes	55.8	147	147.7
Income tax expense	7.4	27.7	27.9
Net income	48.4	119.3	119.8
Comprehensive (loss) income
Unrealized AFS investment (losses) gains during the period, net of tax benefit (expense) of $53.8, $13.6, and $(14.2) for the years ended December 31, 2022, 2021, and 2020, respectively	(202.3)	(51.3)	53.4
Reclassification adjustment for realized AFS investment losses (gains) in net income, net of tax (benefit) expense of $(0.8), $0.9, and $0.9 for the years ended December 31, 2022, 2021, and 2020, respectively	2.8	(3.2)	(3.6)
Other comprehensive (loss) income, net of tax	(199.5)	(54.5)	49.8
Total comprehensive (loss) income	(151.1)	64.8	169.6
Net realized and unrealized (losses) gains on investments
Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss	$ (51.8)	$ 54.6	$ 19
Earnings per common share (Note $18):
Basic	$ 1.76	$ 4.22	$ 4.01
Diluted	$ 1.75	$ 4.17	$ 3.97

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income Parentheticals - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Parentheticals [Abstract]
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	$ 53.8	$ 13.6	$ (14.2)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	$ 0.8	$ (0.9)	$ (0.9)

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 at Cost
Stockholders' equity, shares at Dec. 31, 2019		57,184,370
Stockholders' equity, value at Dec. 31, 2019	$ 1,165.8	$ 0.6	$ 396.4	$ 1,158.8	$ 65.3	$ (455.3)
Stock-based obligations (Note 14), shares		0
Stock-based obligations (Note 14), value	9.7	$ 0	9.7	0	0	0
Stock-options exercised, shares		40,800
Stock options exercised, value	0.9	$ 0	0.9	0	0	0
Vesting of restricted stock units, net of shares withheld to satisfy minimum tax withholding (Note 14), shares		188,636
Vesting of restricted stock units, net of shares withheld to satisfy minimum tax withholding (Note 14), value	(2.7)	$ 0	(2.7)	0	0	0
Acquisition of treasury stock (Note 13), shares		0
Acquisition of treasury stock (Note 13), value	(99.8)	$ 0	0	0	0	(99.8)
Dividend to common stockholders, shares		0
Dividend to common stockholders, value	30.8	$ 0	0	30.8	0	0
Net income for the period	119.8	0	0	119.8	0	0
Change in net unrealized gains on investments, net of taxes	49.8	$ 0	0	0	49.8	0
Stockholders' equity, shares at Dec. 31, 2020		57,413,806
Stockholders' equity, value at Dec. 31, 2020	1,212.8	$ 0.6	404.3	1,247.9	115.1	(555.1)
Stock-based obligations (Note 14), shares		0
Stock-based obligations (Note 14), value	9.1	$ 0	9.1	0	0	0
Stock-options exercised, shares		48,051
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		228,397
Vesting of restricted stock units, net of shares withheld to satisfy minimum tax withholding (Note 14), value	(3.8)	$ 0	(3.8)	0	0	0
Acquisition of treasury stock (Note 13), shares		0
Acquisition of treasury stock (Note 13), value	(42.2)	$ 0	0	0	0	(42.2)
Dividend to common stockholders, shares		0
Dividend to common stockholders, value	28.7	$ 0	0	28.7	0	0
Net income for the period	119.3	0	0	119.3	0	0
Change in net unrealized gains on investments, net of taxes	$ (54.5)	$ 0	0	0	(54.5)	0
Stockholders' equity, shares at Dec. 31, 2021	57,690,254	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
Change in net unrealized gains on investments, net of taxes	$ (199.5)	$ 0	0	0	(199.5)	0
Stockholders' equity, shares at Dec. 31, 2022	57,876,287	57,876,287
Stockholders' equity, value at Dec. 31, 2022	$ 944.2	$ 0.6	$ 414.6	$ 1,295.6	$ (138.9)	$ (627.7)

Consolidated Statements of St_2

Consolidated Statements of Stockholders Equity Parentheticals - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Consolidated Statement of Stockholders Equity Parentheticals [Abstract]
Other Comprehensive Income (Loss), Tax	$ 53	$ 14.5	$ (13.3)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 48.4	$ 119.3	$ 119.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5.3	7.4	8.2
Stock-based compensation	5.1	9.1	9.7
Amortization of cloud computing arrangements	16.4	14.2	9
Net amortization on investments	3	8.5	9.8
Allowance for expected credit losses	2.8	(0.3)	6.6
Deferred income tax expense	(17.4)	6.7	(13.4)
Net realized and unrealized losses (gains) on investments	51.8	(54.6)	(19)
Asset impairment charges	0	1	0.8
Change in operating assets and liabilities:
Premiums receivable	(63.7)	(12.1)	47.4
Reinsurance recoverable on paid and unpaid losses	32.2	20.2	35.1
Cloud computing arrangements	(15.4)	(7.9)	(25.6)
Operating lease right-of-use-assets	2.7	3.2	(2.3)
Current federal income taxes	8.8	(7.9)	22
Unpaid losses and loss adjustment expenses	(20.5)	(88.2)	(123.4)
Unearned premiums	34.8	5.6	(38)
Accounts payable, accrued expenses and other liabilities	7.2	(2.5)	(4)
Deferred reinsurance gain–LPT Agreement	(8.3)	(11)	(11.7)
Contingent commission receivable–LPT Agreement	0	(0.5)	(0.2)
Operating lease liabilities	(3)	(3.3)	2.1
Non-cancellable obligations	4.4	(2.4)	1.1
Other	5.2	6.3	(1)
Net cash provided by operating activities	99.8	10.8	33
Investing activities
Purchases of fixed maturity securities	(611.4)	(516.6)	(645.6)
Purchases of equity securities	(124.9)	(199.5)	(179.5)
Purchases of short-term investments	(132.7)	(12.5)	(135.9)
Purchases of other invested assets	(20.3)	(17.3)	(8.3)
Proceeds from sale of fixed maturity securities	313.8	206.7	349.5
Proceeds from sale of equity securities	216.3	135.9	243.4
Proceeds from maturities and redemptions of fixed maturity securities	195	373.5	359.2
Proceeds from maturities of short-term investments	24	28.3	110.6
Net change in unsettled investment purchases and sales	(3.3)	3.4	(3.6)
Capital expenditures and other	(2.6)	(3.6)	(5.5)
Net cash (used in) provided by investing activities	(146.1)	(1.7)	84.3
Financing activities
Acquisition of common stock	(30.4)	(42.6)	(99.4)
Cash transactions related to stock-based compensation	(1.2)	(2.7)	(1.8)
Dividends paid to stockholders and eligible plan award holders	(90.3)	(29)	(30.5)
Proceeds from FHLB advances	182.5	0	35
Repayments of Notes Payable	0	(20)	(15)
Proceeds from Lines of Credit	10	27	0
Repayments on line of credit advances	(10)	(27)	0
Payments on finance leases	(0.2)	(0.1)	(0.2)
Net cash used in financing activities	60.4	(94.4)	(111.9)
Net increase (decrease) in cash, cash equivalents, and restricted cash	14.1	(85.3)	5.4
Cash, cash equivalents, and restricted cash at the beginning of the period	75.3	160.6	155.2
Cash, cash equivalents, and restricted cash at the end of the period	89.4	75.3	160.6
Non-cash transactions
Financed property and equipment purchases	0.1	0.3	0.1
Conversion of Stock, Amount Converted	0	20	0
Cash, cash equivalents, and restricted cash
Cash and cash equivalents	89.2	75.1
Restricted cash and cash equivalents	0.2	0.2
Total cash, cash equivalents, and restricted cash	$ 89.4	$ 75.3	$ 160.6

Basis of Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2022
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 is entitled to receive a contingent profit commission under the LPT Agreement. The contingent profit commission is estimated based on both actual paid results to date and projections of expected paid losses under the LPT Agreement and is recorded as an asset on the Company's Consolidated Balance Sheets. 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 through two reportable segments: Employers and Cerity . Each of the segments represents a separate and distinct underwriting platform through which the Company conducts insurance business. This presentation allows the reader, as well as the Company's chief operating decision makers, to objectively analyze the business originated through each of the Company's underwriting platforms. Detailed financial information about the Company's operating segments 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 reclassified to conform to the current period presentation.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
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, 2022 and 2021 the Company held $2.7 million and $3.1 million, respectively, 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) income 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. 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 either net asset value or fair value and changes in the value of these investments are included in Net realized and unrealized (losses) gains on investments on the Company's Consolidated Statements of Comprehensive Income. Beginning in 2020, with the adoption of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) , 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 (losses) gains on investments on the Company's Consolidated Statements of Comprehensive Income (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 earned, over the period of the contract in proportion to the amount of insurance protection provided. At the end of the policy term, payroll-based 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, economic conditions, and seasonality, and are continually reviewed and adjusted as experience develops or new information becomes known. Any such adjustments are included in current operations; however, they 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 $38.7 million and $13.8 million of additional premiums expected to be received from policyholders for premium audits at December 31, 2022 and 2021, 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. 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 $12.8 million and $10.3 million at December 31, 2022 and 2021, respectively. The Company had write offs of $2.0 million, $2.5 million, and $6.8 million for the years ended December 31, 2022, 2021, and 2020, 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, 2022, 2021, and 2020, was $106.4 million, $92.2 million, and $97.5 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, 2022, 2021, and 2020. 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. Additionally, the Company is 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 $444.5 million and $476.3 million at December 31, 2022 and 2021, respectively. Beginning in 2020, with the adoption of ASU 2016-13 , 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 (Loss) Income (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. 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, 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 is entitled to receive a contingent profit commission under the LPT Agreement. The contingent profit commission is 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 June 30, 2024. The contingent profit commission is paid every five years beginning June 30, 2004 for the first 25 years of the agreement. The Company could be required to return any previously received contingent profit commission, plus interest, in the event of unfavorable differences through June 30, 2024. The Company records an estimate of contingent profit commission on its Consolidated Balance Sheets as Contingent commission receivable–LPT Agreement and a corresponding liability is recorded as Deferred reinsurance gain–LPT Agreement. The Contingent commission receivable–LPT Agreement is reduced as amounts are received from participating reinsurers. In 2019, the Company received $19.1 million in cash related to the contingent profit commission. The Deferred reinsurance gain–LPT Agreement is amortized using the recovery method. The amortization of the contingent profit commission is determined by the proportion of actual reinsurance recoveries to total estimated recoveries over the life of the contingent profit commission (through June 30, 2024), and is recorded in losses and LAE incurred in the Company's Consolidated Statements of Comprehensive (Loss) Income. Any adjustment to the contingent profit commission 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 (Loss) Income, such that the Deferred Gain reflects the balance that would have existed had the revised contingent profit 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 three to seven years. Leasehold improvements are also 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 three to eight 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, 2022 and 2021, 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. The Company also obtains collateral from its reinsurers in order to mitigate the risks related to insolvencies. At December 31, 2022 and 2021, $1.7 million and $1.8 million were held as collateral by cash or letters of credit for the Company's reinsurance recoverables, respectively. 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 around the fourth quarter of each year. At the end of each quarter, management 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, 2022 and 2021. Intangible assets related to state licenses are not subject to amortization. Intangibles related to insurance relationships were amortized in proportion to the expected period of benefit and were fully amortized as of December 31, 2022. 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: 2022 2021 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 2022 or 2021. Amortization expenses are included in the Company's Consolidated Statements of Comprehensive (Loss) Income 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 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, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Standards	New Accounting Standards Recently Issued Accounting Standards In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) . This update provides 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 can apply this ASU immediately, but early adoption is only available through December 31, 2022 when the ASU becomes effective. The Company evaluated the impact of LIBOR on its existing contracts and investments and does not expect that this update will have a material impact on its consolidated financial condition or results of operations. Recently Adopted Accounting Standards In October 2020, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2020-10, Codification Improvements . This update ensures all disclosure guidance that requires or provides an option for an entity to provide notes to the financial statements is included in the Disclosure Section (Section 50) of the Codification. This update also provides various codification improvements in which the original guidance was unclear. This update became effective for annual periods beginning after December 15, 2020 and early adoption is permitted for any annual or interim period for which financial statements have not been issued. The Company determined that the impact of this standard was not material to its consolidated financial condition and results of operations. In October 2020, the FASB issued ASU 2020-08 , Codification Improvements to Subtopic 310-20, Receivable-Nonrefundable fees and other costs. The amendments in that Update shortened the amortization period for certain purchased callable debt securities held at a premium by requiring that entities amortize the premium associated with those callable debt securities within the scope of paragraph 310-20-25-33 to the earliest call date. The amendments affect the guidance in Accounting Standards Update No. 2017-08, receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. The amendments in this update became effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2020. Early adoption is not permitted. The Company determined that the impact of this standard was not material to its consolidated financial condition and results of operations. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740). This update simplifies the accounting for income taxes within Accounting Standards Codification (ASC) topic 740 by removing certain exceptions and clarifies existing guidance. This update became effective for annual periods beginning after December 15, 2020. The Company determined that the impact of this standard was not material to its consolidated financial condition and results of operations. In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments . The amendments in this update represent changes to clarify, correct errors in, or improve the codification within various ASC topics. The Company adopted the updates related to Topic 815 when it adopted ASU 2016-13 . The Company determined that the impact of these improvements was not material to its consolidated financial condition and results of operations. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This update removes the disclosure requirements for the amounts of and the reasons for transfers between Level 1 and Level 2 and disclosure of the policy for timing of transfers between levels. This update also removes disclosure requirements for the valuation processes for Level 3 fair value measurements. Additionally, this update adds disclosure requirements for the changes in unrealized gains and losses for recurring Level 3 fair value measurements and quantitative information for certain unobservable inputs in Level 3 fair value measurements. Additionally, in March 2020, the FASB issued ASU 2020-03, Codification Improvements to Financial Instruments. This update provided clarification and eliminated inconsistencies on a variety of topics within the codification. The Company adopted the applicable standards and there was no impact on its consolidated financial condition and results of operations. In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350) . This update simplifies the measurement of goodwill by eliminating the performance of Step 2 in the goodwill impairment analysis. This update allows the testing to be performed by comparing the fair value of a reporting unit with its carrying amount and recognizing an impairment charge when the carrying amount exceeds fair value. Additionally, this update eliminates the requirements of any reporting unit with a zero or negative carrying value to perform Step 2, but requires disclosure of the amount of goodwill allocated to a reporting unit with zero or negative carrying amount of net assets. This update became effective for its annual or any interim goodwill impairment tests beginning after December 15, 2020. The Company adopted this standard and there was no impact on its consolidated financial condition and results of operations. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) . This update replaces the incurred loss impairment methodology for recognizing credit losses on financial instruments with a methodology that reflects an entity's current estimate of all expected credit losses. This update requires financial assets (including receivables and reinsurance recoverables) measured at amortized cost to be presented net of an allowance for credit losses. Additionally, this update requires credit losses on available-for-sale fixed maturity securities to be presented as an allowance rather than as a write-down, allowing an entity to also record reversals of credit losses in current period net income. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Additionally, in December 2018, the FASB issued ASU 2018-19, Codification Improvements to Topic 326, Financial Instruments - Credit Losses. This update provides clarification on the effective and transition dates and the exclusion of operating lease receivables from Topic 326. In May 2019, the FASB issued ASU 2019-05, Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief . This update adds optional transition relief for entities to elect the fair value option for certain financial assets previously measured at amortized cost basis to increase comparability of similar financial assets. In December 2019, the FASB issued ASU 2019-11, Codification Improvements to Topic 326, Financial Instruments - Credit Losses which provides clarification on certain aspects of the guidance in ASC 326 including purchased credit-deteriorated financial assets, transition relief for troubled debt restructurings, disclosure relief for accrued interest receivables and allows a practical expedient for financial assets secured by collateral maintenance provisions. The Company adopted these standards on January 1, 2020 and did not make any opening balance sheet adjustments due to the immaterial amounts. See Note 6 regarding the impact of this adoption on the Company's consolidated financial condition and results of operations.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2022
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: 2022 2021 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial assets (in millions) Total investments at fair value (Note 5) $ 2,502.4 $ 2,502.4 $ 2,692.0 $ 2,692.0 Cash and cash equivalents 89.2 89.2 75.1 75.1 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 the 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, 2022 and 2021. 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, 2022, the Company held $24.2 million of fixed maturity securities at fair value that were designated Level 3. These private placements securities, which were acquired during 2022, 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, 2022 December 31, 2021 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 (in millions) Fixed maturity securities U.S. Treasuries $ — $ 90.8 $ — $ — $ 65.7 $ — U.S. Agencies — 2.1 — — 2.4 — States and municipalities — 317.6 — — 436.1 — Corporate securities — 851.9 16.2 — 1,080.3 — Residential mortgage-backed securities — 360.2 — — 321.8 — Commercial mortgage-backed securities — 55.1 — — 92.3 — Asset-backed securities — 58.1 8.0 — 68.5 — Collateralized loan obligations — 260.9 — — 85.4 — Foreign government securities — 10.2 — — 12.5 — Other securities — 155.2 — — 177.7 — Total fixed maturity securities $ — $ 2,162.1 $ 24.2 $ — $ 2,342.7 $ — Equity securities at fair value Industrial and miscellaneous $ 165.3 $ — $ — $ 283.1 $ — $ — Other 31.5 0.2 — 55.7 — — Total equity securities at fair value $ 196.8 $ 0.2 $ — $ 338.8 $ — $ — Short-term investments $ 119.1 $ — $ — $ — $ 10.5 $ — Total investments at fair value $ 315.9 $ 2,162.3 $ 24.2 $ 338.8 $ 2,353.2 $ — Financial Instruments Carried at Cost EICN, ECIC, EPIC, EAC and CIC are members of the Federal Home Loan Bank of San Francisco (FHLB). Members are required to purchase stock in the FHLB in addition to maintaining collateral deposits that back any funds advanced. 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 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 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, 2022 December 31, 2021 Cash equivalents measured at NAV 65.5 29.5 Other invested assets carried at NAV 59.7 38.4 The following table provides a reconciliation of the beginning and ending balances that are measured using Level 3 inputs for the year ended December 31, 2022. Level 3 Securities (in millions) Beginning balance, January 1, 2022 $ — Purchases 25.8 Unrealized losses included in comprehensive (loss) income (1.6) Ending balance, December 31, 2022 $ 24.2

Investments

Investments	12 Months Ended
	Dec. 31, 2022
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 Current Expected Credit Losses Gross Gross Estimated At December 31, 2022 (in millions) Fixed maturity securities U.S. Treasuries $ 95.1 $ — $ 0.1 $ (4.4) $ 90.8 U.S. Agencies 2.2 — — (0.1) 2.1 States and municipalities 326.7 — 0.8 (9.9) 317.6 Corporate securities 963.4 (2.8) 2.0 (94.5) 868.1 Residential mortgage-backed securities 403.5 — 0.3 (43.6) 360.2 Commercial mortgage-backed securities 61.5 — — (6.4) 55.1 Asset-backed securities 74.0 — 0.1 (8.0) 66.1 Collateralized loan obligations 268.1 — — (7.2) 260.9 Foreign government securities 13.0 — — (2.8) 10.2 Other securities (1) 159.2 (1.7) 0.6 (2.9) 155.2 Total fixed maturity securities 2,366.7 (4.5) 3.9 (179.8) 2,186.3 Short-term investments 119.1 — — — 119.1 Total AFS investments $ 2,485.8 $ (4.5) $ 3.9 $ (179.8) $ 2,305.4 At December 31, 2021 Fixed maturity securities U.S. Treasuries $ 64.3 $ — $ 1.6 $ (0.2) $ 65.7 U.S. Agencies 2.2 — 0.2 — 2.4 States and municipalities 413.8 — 22.4 (0.1) 436.1 Corporate securities 1,035.3 (0.2) 47.0 (1.8) 1,080.3 Residential mortgage-backed securities 319.0 — 7.0 (4.2) 321.8 Commercial mortgage-backed securities 87.9 — 4.5 (0.1) 92.3 Asset-backed securities 68.6 — 0.4 (0.5) 68.5 Collateralized loan obligations 85.5 — — (0.1) 85.4 Foreign government securities 12.7 — — (0.2) 12.5 Other securities (1) 177.0 — 1.2 (0.5) 177.7 Total fixed maturity securities 2,266.3 (0.2) 84.3 (7.7) 2,342.7 Short-term investments 10.5 — — — 10.5 Total AFS investments $ 2,276.8 $ (0.2) $ 84.3 $ (7.7) $ 2,353.2 (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, 2022 and 2021 were as follows: Cost Estimated Fair Value (in millions) At December 31, 2022 Equity securities at fair value Industrial and miscellaneous $ 115.3 $ 165.3 Other 28.9 31.7 Total equity securities at fair value $ 144.2 $ 197.0 At December 31, 2021 Equity securities at fair value Industrial and miscellaneous $ 170.5 $ 283.1 Other 42.1 55.7 Total equity securities at fair value $ 212.6 $ 338.8 The Company had Other invested assets totaling $59.7 million and $38.4 million (initial cost of $54.4 million and $34.1 million) at December 31, 2022 and 2021, 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 (Loss) Income. The amortized cost and estimated fair value of the Company's fixed maturity securities at December 31, 2022, 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 $ 69.3 $ 68.7 Due after one year through five years 808.2 776.0 Due after five years through ten years 595.7 529.9 Due after ten years 81.9 69.4 Mortgage and asset-backed securities 807.1 742.3 Total $ 2,362.2 $ 2,186.3 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 as of December 31, 2022 and 2021. December 31, 2022 December 31, 2021 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 $ 76.8 $ (3.5) 13 $ 12.8 $ (0.2) 4 U.S. Agencies 2.1 (0.1) 1 — — — States and municipalities 193.4 (9.0) 68 7.7 (0.1) 4 Corporate securities 763.3 (76.4) 335 113.0 (1.8) 87 Residential mortgage-backed securities 236.8 (17.9) 186 146.3 (3.9) 65 Commercial mortgage-backed securities 52.5 (5.7) 22 — — — Asset-backed securities 27.6 (2.6) 22 50.1 (0.5) 14 Collateralized loan obligations 209.9 (5.5) 37 24.4 (0.1) 10 Foreign government securities — — — 12.5 (0.2) 2 Other securities 81.6 (1.8) 224 66.3 (0.4) 176 Total fixed maturity securities 1,644.0 (122.5) 908 433.1 (7.2) 362 Total less than 12 months $ 1,644.0 $ (122.5) 908 $ 433.1 $ (7.2) 362 12 months or greater: Fixed maturity securities U.S. Treasuries $ 11.2 $ (0.9) 4 $ — $ — — States and municipalities 5.4 (0.9) 3 — — — Corporate securities 84.6 (18.1) 84 — — — Residential mortgage-backed securities 106.6 (25.7) 65 4.9 (0.3) 3 Commercial mortgage-backed securities 2.6 (0.7) 3 2.4 (0.1) 2 Asset-backed securities 27.7 (5.4) 11 — — — Collateralized loan obligations 36.9 (1.7) 11 — — — Foreign government securities 10.2 (2.8) 3 — — — Other securities 38.4 (1.1) 119 8.0 (0.1) 29 Total fixed maturity securities 323.6 (57.3) 303 15.3 (0.5) 34 Total 12 months or greater $ 323.6 $ (57.3) 303 $ 15.3 $ (0.5) 34 The Company recorded CECL on AFS debt securities of $4.5 million and $0.2 million during the years ended December 31, 2022 and 2021 (see Note 6). Those fixed maturity securities whose total fair value was less than amortized cost at December 31, 2022 and December 31, 2021, 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 changes in the expected credit loss allowance. 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 (Increase) Decrease Change in CECL Allowance Change in Net Unrealized Gains (Losses) Changes in Fair Value Reflected in Earnings Changes in Fair Value Reflected in AOCI, before tax (in millions) 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 — Short-term investments — — — — — — Total investments $ 44.4 $ (19.6) $ (4.3) $ (324.8) $ (51.8) $ (252.5) Year Ended December 31, 2021 Fixed maturity securities $ 4.7 $ (1.1) $ 0.5 $ (68.9) $ 4.1 $ (68.9) Equity securities 20.6 (5.0) — 30.0 45.6 — Other invested assets — — — 4.9 4.9 — Short-term investments — — — (0.1) — (0.1) Total investments $ 25.3 $ (6.1) $ 0.5 $ (34.1) $ 54.6 $ (69.0) Year Ended December 31, 2020 Fixed maturity securities $ 9.2 $ (4.1) $ (0.7) $ 63.0 $ 4.4 $ 63.0 Equity securities 42.6 (21.8) — (5.0) 15.8 — Other invested assets — — — (1.3) (1.3) — Short-term investments 0.1 — — 0.1 0.1 0.1 Total investments $ 51.9 $ (25.9) $ (0.7) $ 56.8 $ 19.0 $ 63.1 Proceeds from the sales of fixed maturity securities were $313.8 million, $206.7 million and $349.5 million for years ended December 31, 2022, 2021, and 2020, respectively. Net investment income was as follows: Years Ended December 31, 2022 2021 2020 (in millions) Fixed maturity securities $ 81.1 $ 69.8 $ 72.6 Equity securities 8.3 5.4 4.4 Other invested assets 2.8 2.7 2.8 Short-term investments 0.2 0.2 1.5 Cash equivalents and restricted cash 2.1 — 0.5 Gross investment income 94.5 78.1 81.8 Investment expenses (4.7) (5.4) (5.5) Net investment income $ 89.8 $ 72.7 $ 76.3 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, 2022 and 2021, securities having a fair value of $745.9 million and $861.4 million, respectively, were on deposit. Additionally, standby letters of credit from the FHLB were in place in lieu of $70.0 million of securities on deposit as of December 31, 2022 and 2021 (see Note 11). Certain reinsurance contracts require the Company's funds 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 December 31, 2022 and 2021 was $2.7 million and $3.1 million, respectively.

Credit Losses

Credit Losses	12 Months Ended
	Dec. 31, 2022
Credit Loss [Abstract]
Allowance for Credit Losses	Current Expected Credit Losses Premiums Receivable Premiums receivable balances are all due within one year or less. 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 are recorded through underwriting and general and administrative expenses. The table below shows the changes in the allowance for CECL on premiums receivable. Years Ended December 31, 2022 2021 (in millions) Beginning balance of the allowance for CECL on premiums receivable $ 10.3 $ 10.8 Current period provision for CECL 9.6 10.6 Write-offs charged against the allowance (2.0) (2.5) Recoveries collected (5.1) (8.6) Ending balance of the allowance for CECL on premiums receivable $ 12.8 $ 10.3 Reinsurance Recoverable In assessing an allowance for reinsurance assets, which includes reinsurance recoverables and contingent commission receivables, the Company considers historical information, financial strength of reinsurers, collateralization amounts and ratings 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 the A.M. Best Average Cumulative Net Impairment Rates. Reinsurer ratings are also assessed through this process. Changes in the allowance for CECL are recorded through underwriting and general and administrative expenses. The table below shows the changes in the allowance for CECL on reinsurance recoverables. Years Ended December 31, 2022 2021 (in millions) Beginning balance of the allowance for CECL on reinsurance recoverables $ 0.6 $ 0.4 Current period provision for CECL 0.3 0.2 Ending balance of the allowance for CECL on reinsurance recoverables $ 0.9 $ 0.6 Investments The Company assesses all AFS debt securities 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 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. Any impairment that has not been recorded through an allowance for credit losses is recognized in Accumulated other comprehensive (loss) income on the Company's Consolidated Balance Sheets. Changes in the allowance for CECL are recorded through realized capital losses. As of December 31, 2022, the Company established an aggregate allowance for CECL in the amount of $4.5 million. For the Company’s investments in fixed-income 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 (CCAR) framework, which is adopted by the Federal Reserve. As of December 31, 2022, the Company did not intend to sell any of its AFS debt securities in which its amortized cost exceeded its fair value. Accrued interest receivable on AFS debt securities totaled $19.0 million at December 31, 2022 and is excluded from the estimate of credit losses based on historically timely payments. The table below shows the changes in the allowance for CECL on AFS securities. Years Ended December 31, 2022 2021 (in millions) Beginning balance of the allowance for CECL on AFS securities $ 0.2 $ 0.7 Current period provision for CECL 4.5 — Reductions in allowance from disposals — (0.2) Recoveries of amounts previously written off (0.2) (0.3) Ending balance of the allowance for CECL on AFS securities $ 4.5 $ 0.2

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2022
Property and Equipment [Abstract]
Property, Plant and Equipment Disclosure	Property and Equipment Property and equipment consists of the following: As of December 31, 2022 2021 (in millions) Furniture and equipment $ 3.3 $ 3.3 Leasehold improvements 5.0 5.0 Computers and software 47.6 46.8 Automobiles 0.8 0.8 Property and equipment, gross 56.7 55.9 Accumulated depreciation (44.7) (41.2) Property and equipment, net $ 12.0 $ 14.7 Depreciation expenses related to property and equipment for the years ended December 31, 2022, 2021, and 2020 were $5.3 million, $7.4 million, and $8.2 million, respectively. Internally developed software costs of $1.2 million and $2.3 million were capitalized during the years ended December 31, 2022 and 2021, respectively. Cloud Computing Arrangements The Company's capitalized costs associated with cloud computing arrangements totaled $42.9 million and $43.9 million, which were comprised of service contract fees and implementation costs associated with hosting arrangements on the Company's Consolidated Balance Sheets as of December 31, 2022 and 2021, respectively. Total amortization for hosting arrangements for the years ended December 31, 2022 and 2021 was $16.4 million and $14.2 million, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Taxes [Abstract]
Income Taxes	Income TaxesThe 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. The Company's provision for income taxes consisted of the following: Years Ended December 31, 2022 2021 2020 Current tax expense: (in millions) Federal $ 23.6 $ 20.2 $ 27.6 State 1.1 0.8 0.7 Total current tax expense 24.7 21.0 28.3 Deferred federal tax expense: Other (17.3) 6.7 (0.4) Total deferred federal tax expense (17.3) 6.7 (0.4) Income tax expense $ 7.4 $ 27.7 $ 27.9 The differences 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 were as follows: Years Ended December 31, 2022 2021 2020 (in millions) Expense computed at statutory rate $ 11.7 $ 31.0 $ 31.0 Tax-advantaged investment income (1.4) (1.7) (1.9) LPT deferred gain amortization (1.7) (1.9) (2.2) Stock based compensation (0.1) 0.1 (0.2) LPT Reserve Adjustment — (0.5) (0.3) Pre-Privatization reserve adjustments, excluding LPT (0.9) (0.5) (0.4) Other (0.2) 1.2 1.9 Income tax expense $ 7.4 $ 27.7 $ 27.9 The LPT Reserve Adjustments for the years ended December 31, 2021 and 2020 increased GAAP net income by $2.6 million, and $1.2 million, respectively, but did not affect taxable income. The LPT Contingent Commission Adjustments increased net income by $0.5 million, and $0.2 million during 2021 and 2020, respectively, but did not increase taxable income. As of December 31, 2022, 2021, and 2020 the Company had no material unrecognized tax benefits and its tax years 2019 through 2022 remain open and are available for examination by the Internal Revenue Service. The Company made cash payments of $15.1 million, $28.2 million and $18.5 million for income taxes during the years ended December 31, 2022, 2021, and 2020, respectively. The significant components of deferred income taxes, net, were as follows as of December 31: 2022 2021 Deferred Tax Deferred Tax Assets Liabilities Assets Liabilities (in millions) Unrealized capital gains and losses, net $ 24.7 $ — $ — $ 43.5 Deferred policy acquisition costs — 10.3 — 9.4 Intangible assets — 1.6 — 1.6 Loss reserve discounting for tax reporting 31.2 — 30.0 — Unearned premiums 13.2 — 11.9 — Allowance for bad debt 2.9 — 2.3 — Stock-based compensation 1.8 — 2.5 — Accrued liabilities 4.6 — 4.1 — Operating leases 2.9 2.4 3.5 3.0 Other 3.2 7.5 2.2 6.7 Total $ 84.5 $ 21.8 $ 56.5 $ 64.2 Deferred income tax asset (liability), net $ 62.7 $ (7.7) 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.

Liability for Unpaid Losses and

Liability for Unpaid Losses and Loss Adjustment Expenses	12 Months Ended
	Dec. 31, 2022
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: (a) future payments on claims that are incurred but have not yet been reported to the Company; (b) a reserve for the additional development on claims that have been reported to the Company; and (c) 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's Internal Actuary 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, 2022 2021 2020 (in millions) Unpaid losses and LAE at beginning of period $ 1,981.2 $ 2,069.4 $ 2,192.8 Less reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 476.9 497.0 532.5 Net unpaid losses and LAE at beginning of period 1,504.3 1,572.4 1,660.3 Losses and LAE, net of reinsurance, incurred during the period related to: Current year 432.8 366.5 395.9 Prior years (33.5) (39.8) (81.6) Total net losses and LAE incurred during the period 399.3 326.7 314.3 Paid losses and LAE, net of reinsurance, related to: Current year 92.5 76.6 83.6 Prior years 295.8 318.2 318.6 Total net paid losses and LAE during the period 388.3 394.8 402.2 Ending unpaid losses and LAE, net of reinsurance 1,515.3 1,504.3 1,572.4 Reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 445.4 476.9 497.0 Unpaid losses and LAE at end of period $ 1,960.7 $ 1,981.2 $ 2,069.4 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 2022, the Company had $33.5 million of net favorable prior accident year loss reserve development, which included $32.1 million of favorable loss reserve development on the Company's voluntary risk business and $1.4 million on its assigned risk business. The net favorable loss development recognized in 2022 was primarily the result of observed favorable paid loss cost trends predominantly related to accident years 2017 and prior, due primarily to decreasing medical and indemnity costs. In 2021, the Company had $39.8 million of net favorable prior accident year loss reserve development, which included $38.0 million of favorable development on its voluntary risk business and $1.8 million on its assigned risk business. The net favorable development recognized in 2021 on voluntary business was primarily the result of observed favorable paid loss cost trends predominantly related to accident years 2017 and prior, due primarily to decreasing medical costs and defense and cost containment, partially offset by: (i) $10.0 million of unfavorable development related to accident year 2019, which is reflective of more weight being placed on now sufficiently seasoned loss trends and patterns originating in part from business written in our newer territories; and (ii) $8.0 million of unfavorable loss development associated with two catastrophic non-COVID claims in accident year 2020. In 2020, the Company had $81.6 million of net favorable prior accident year loss reserve development, which included $80.2 million of favorable development on its voluntary risk business and $1.4 million on its assigned risk business. The net favorable development recognized in 2020 on voluntary business was primarily the result of observed favorable paid loss cost trends predominantly related to accident years 2018 and prior, due primarily to decreasing medical costs, partially offset by $13.3 million of adverse development on accident year 2019 partially due to an inability to fully execute its claims initiatives to reduce loss costs as a result of the COVID-19 pandemic. 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, 2022 for each of the previous 10 accident years. Incurred Losses and DCC, Net of Reinsurance Years Ended December 31, As of December 31, 2022 Accident Year 2013 (1) 2014 (1) 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 (1) 2020 (1) 2021 (1) 2022 IBNR Cumulative number of reported claims (in millions, except claims counts) 2013 $ 452.6 $ 460.6 $ 478.6 $ 472.6 $ 468.9 $ 464.6 $ 459.3 $ 446.8 $ 440.9 $ 436.9 $ 24.6 28,941 2014 463.4 445.8 432.9 434.6 430.5 424.7 415.5 406.0 402.1 28.6 28,598 2015 422.2 425.8 423.9 419.6 408.7 396.7 384.9 381.9 28.5 27,273 2016 419.0 414.6 395.4 375.0 364.6 354.8 350.4 28.4 25,820 2017 412.4 391.3 358.3 337.9 329.8 326.9 35.8 25,121 2018 422.5 424.6 407.7 400.6 400.5 35.4 28,008 2019 422.4 435.7 448.5 448.8 62.6 32,989 2020 365.7 374.0 373.3 66.9 24,195 2021 339.2 339.0 72.2 22,624 2022 399.3 190.7 20,202 Total $ 3,859.2 Cumulative Paid Losses and DCC, Net of Reinsurance Years Ended December 31, Accident Year 2013 (1) 2014 (1) 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 (1) 2020 (1) 2021 (1) 2022 (in millions) 2013 $ 68.5 $ 184.4 $ 263.8 $ 317.4 $ 346.1 $ 365.9 $ 379.3 $ 386.6 $ 391.3 $ 395.5 2014 65.3 172.7 248.9 297.2 323.4 342.1 351.4 357.7 361.6 2015 65.5 174.5 246.9 290.5 311.2 322.2 329.3 333.7 2016 65.6 166.8 227.7 261.2 278.3 290.0 298.1 2017 63.5 160.2 215.7 243.7 260.0 269.5 2018 77.9 189.9 254.2 293.6 315.2 2019 88.8 212.6 285.2 325.8 2020 71.9 175.6 233.5 2021 66.1 166.8 2022 76.5 Total $ 2,776.2 All outstanding liabilities for unpaid losses and DCC prior to 2013, net of reinsurance 363.8 Total outstanding liabilities for unpaid losses and DCC, net of reinsurance $ 1,446.8 (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, 2022 (in millions) Liabilities for unpaid losses and LAE, net of reinsurance $ 1,446.8 Reinsurance recoverable, excluding CECL allowance, on unpaid losses 445.4 AO 68.5 Total liability for unpaid losses and LAE $ 1,960.7 The following table presents the average annual percentage payout of incurred claims by age, net of reinsurance, as of December 31, 2022 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 18.4 % 28.1 % 17.3 % 10.4 % 5.6 % 3.7 % 2.4 % 1.5 % 1.0 % 1.0 %

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2022
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, 2022 2021 2020 Written Earned Written Earned Written Earned (in millions) Direct premiums $ 705.3 $ 673.2 $ 582.6 $ 574.0 $ 570.8 $ 611.0 Assumed premiums 8.9 9.0 7.1 7.0 9.3 9.5 Gross premiums 714.2 682.2 589.7 581.0 580.1 620.5 Ceded premiums (7.0) (7.0) (6.6) (6.6) (5.2) (5.2) Net premiums $ 707.2 $ 675.2 $ 583.1 $ 574.4 $ 574.9 $ 615.3 Ceded losses and LAE incurred $ 3.5 $ 16.8 $ 5.9 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 has consistently maintained excess of loss reinsurance coverage to protect it against the impact of large and/or catastrophic losses in its workers' compensation business. The Company currently maintains reinsurance for losses from a single occurrence or catastrophic event in excess of $10.0 million and up to $200.0 million, subject to certain exclusions. This current reinsurance program is effective July 1, 2022 through June 30, 2023. The coverage under the Company's annual reinsurance program that ended each of July 1, 2021 and 2020 was $190.0 million, in excess of its $10.0 million retention on a per occurrence basis. The reinsurance coverage includes coverage for pandemics, 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 Recoverables from reinsurers on unpaid losses and LAE amounted to $444.5 million and $476.3 million at December 31, 2022 and 2021, respectively. At each of December 31, 2022 and 2021, $308.6 million and $328.7 million, respectively, of those recoverables was 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, 2022, the Company has paid losses and LAE claims totaling $858.9 million related to the LPT Agreement. The Company amortized $8.3 million, $8.4 million, and $10.5 million of the Deferred Gain for the years ended December 31, 2022, 2021, and 2020, respectively. Additionally, the Company recognized favorable development in the estimated reserves ceded under the LPT Agreement of $4.9 million and $4.2 million that reduced the Deferred Gain by $2.6 million and $1.2 million for the years ended December 31, 2021 and 2020, respectively, due to favorable LPT Reserve Adjustments and by $0.5 million and $0.2 million for the years ended December 31, 2021 and 2020, respectively, due to favorable LPT Contingent Commission Adjustments (Note 2 –Reinsurance).

Financing Arrangements

Financing Arrangements	12 Months Ended
	Dec. 31, 2022
Notes Payable [Abstract]
Notes Payable	FHLB Advances, Notes Payable and Other Financing Arrangements On December 15, 2020, the Company entered into a Credit Agreement (the Credit Agreement) with a syndicate of financial institutions. The Credit Agreement provides for a $75.0 million three-year revolving credit facility and is guaranteed by certain of the Company’s wholly owned subsidiaries (Employers Group, Inc. and Cerity Group, Inc.). Borrowings under the Credit Agreement may be used for working capital and general corporate purposes of the Company and its subsidiaries. Pursuant to the Credit Agreement, the Company also has an option to request an increase of the credit available under the facility up to a maximum facility amount of $125.0 million, subject to the consent of lenders and the satisfaction of certain conditions. The interest rates applicable to loans under the Credit Agreement are generally based on a base rate plus a specified margin, ranging from 0.25% to 1.25%, or the Eurodollar rate (which will convert to an alternative reference rate once LIBOR is discontinued), plus a specified margin, ranging from 1.25% to 2.25%. In addition, the Company will pay a fee on each lender’s commitment, ranging from 0.20% to 0.50%, irrespective of usage. The applicable margin and the amount of such commitment fee vary based upon the financial strength rating of the Company’s insurance subsidiaries as most recently announced by A.M. Best or the Company’s debt to total capitalization ratio if such financial strength rating is not available. Interest paid during each of the years ended December 31, 2022 and 2021 was $0.3 million. The Credit Agreement contains covenants that require the Company and its consolidated subsidiaries to maintain: (i) a minimum consolidated net worth of no less than 70% of the Company’s stockholders’ equity as of September 30, 2020, plus 50% of the Company’s aggregate net income thereafter; 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, 2022 and 2021, the Company was in compliance with each of these requirements. The Company incurred $0.7 million in debt issuance costs in connection with the Credit Agreement, which are being amortized over the three-year life of the facility in Interest and Financing expenses. The annual commitment and administrative fee on the unused portion of the facility is 0.30%, for a maximum of $225,000, and an annual agency fee of $25,000. Advances can be repaid at any time without prepayment penalties or additional fees. The Company borrowed and subsequently repaid $10.0 million and $27.0 million under the credit facility during the years ended December 31, 2022 and 2021. As of December 31, 2022 and 2021, the Company had no outstanding borrowings on the credit facility. Other financing arrangements are comprised of the following: All 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, all of which remained outstanding at December 31, 2022. The proceeds from these advances were used to purchase an equivalent amount of high-quality collateralized loan obligation securities. As of December 31, 2022, the Company's weighted average annual interest rate on these advances was 2.65%. Interest incurred and paid during the year ended December 31, 2022 totaled $3.0 million and $2.3 million, respectively. These advances can be repaid at any time without penalty and are collateralized by eligible investment securities. In 2020, the FHLB launched its Recovery Advance Program. The Recovery Advance Program is a zero percent interest, six-month or one-year credit product that members could use to provide immediate relief to property owners, businesses, and other customers from the COVID-19 pandemic. Each FHLB member was allocated up to $10.0 million in advances under the Recovery Advance Program. On May 11, 2020, the Company's insurance subsidiaries, with the exception of CIC, received a total of $35.0 million of advances from the FHLB under the Recovery Advance Program. The advances were secured by collateral previously pledged to the FHLB by the Company's insurance subsidiaries in support of their existing collateralized advance facility, which was reduced by the amount of these outstanding advances. The Company repaid $15.0 million of such advances on November 4, 2020, $5.0 million on March 31, 2021, and the remaining $15.0 million on May 4, 2021. FHLB membership also allows the Company's insurance subsidiaries access to standby letters of credit (Letter of Credit Agreements). On March 9, 2018, ECIC, EPIC, and EAC entered into standby Letter of Credit Agreements with the FHLB. On January 26, 2021, EPIC chose to amend its existing Letter of Credit Agreement to decrease its credit amount to $10.0 million. On August 13, 2021, EAC and ECIC chose to emend their existing Letter of Credit Agreements to decrease their respective credit amounts to $25.0 million and $35.0 million. The amended Letter of Credit Agreements will expire March 31, 2023, 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, 2022 and 2021 letters of credit totaling $70.0 million were issued in lieu of securities on deposit with the State of California under these Letter of Credit Agreements. As of December 31, 2022 and 2021, investment securities having a fair value of $321.2 million and $261.0 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, 2022
Commitments and Contingencies [Abstract]
Commitments and Contingencies Disclosure	Commitments and Contingencies Leases At December 31, 2022, the Company's operating leases have remaining terms of 1 year to 5 years, with options to extend up to 10 years with no termination provision. The Company's finance leases have an option to terminate after 1 year. As a result of the effectiveness of our work-from-home transition, in 2021 we reduced our real estate footprint by closing and vacating certain of our offices. Whereas we believe that our existing office space is adequate for our current needs, we will continue to evaluate our office needs and may further reduce our real estate footprint in the future. Components of lease expense were as follows: Years Ended December 31, 2022 2021 (in millions) Operating lease expense $ 3.4 $ 4.1 Finance lease expense 0.2 0.2 Total lease expense $ 3.6 $ 4.3 As of December 31, 2022, the weighted average remaining lease term for operating leases was 4.4 years and for finance leases was 2.9 years. The weighted average discount rate was 2.2% and 7.3% for operating and finance leases, respectively. Maturities of lease liabilities were as follows: Year Operating Leases Finance Leases (in millions) 2023 $ 3.3 $ 0.2 2024 3.2 0.1 2025 3.1 0.1 2026 2.8 — 2027 1.7 — Thereafter 0.2 — Total lease payments 14.3 0.4 Less: imputed interest (0.7) — Total $ 13.6 $ 0.4 Supplemental balance sheet information related to leases was as follows: As of December 31, 2022 2021 (in millions) Operating leases: Operating lease right-of-use asset $ 11.5 14.2 Operating lease liability 13.6 16.6 Finance leases: Property and equipment, gross 0.8 0.8 Accumulated depreciation (0.4) (0.3) Property and equipment, net 0.4 0.5 Other liabilities $ 0.4 $ 0.5 Supplemental cash flow information related to leases was as follows: Years Ended December 31, 2022 2021 (in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 3.4 $ 4.1 Financing cash flows used for finance leases 0.2 0.1 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 $11.1 million and $10.1 million as of December 31, 2022 and 2021, 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 $15.6 million and $19.9 million, as of December 31, 2022 and 2021, 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, 2022 and 2021, the Company had unfunded commitments to invest $55.2 million and $46.4 million, respectively, into private equity limited partnerships. See Note 4.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2022
Stockholders' Equity Attributable to Parent [Abstract]
Treasury Stock	Stockholders' Equity Stock Repurchase Programs On July 21, 2021, the Board of Directors authorized a new share repurchase program for repurchases of up to $50.0 million of the Company's common stock from July 27, 2021 through December 31, 2022 (the 2021 Program). On April 27, 2022, the Board of Directors authorized a $50.0 million expansion of the 2021 Program to $100.0 million, and extended the program’s expiration to December 31, 2023. The 2021 Program replaced an earlier share repurchase program, which expired on June 30, 2021. The 2021 Program provides that shares may be purchased at prevailing market prices through a variety of methods, including open market or private transactions, in accordance with applicable laws and regulations and as determined by management. The timing and actual number of shares that may be repurchased will depend on a variety of factors, including the share price, corporate and regulatory requirements, and other market and economic conditions. Repurchases under the 2021 Program may be commenced, modified, or suspended from time-to-time without prior notice, and the program may be suspended or discontinued at any time. Through December 31, 2022, the Company has repurchased a total of 1,317,649 shares of common stock at an average price of $39.88 per share, including commissions, for a total of $52.6 million under the 2021 Program. Since the Company's initial public offering in January 2007 through December 31, 2022, the Company has repurchased a total of 30,715,539 shares of common stock at an average cost per share of $20.44 through various stock repurchase programs, which is reported as treasury stock, at cost, on its Consolidated Balance Sheets.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2022
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 of Directors, 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 who were 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, 2022, the only incentive awards outstanding under the Plan were nonqualified stock options, RSUs, and PSUs. Compensation costs are recognized based on 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 was as follows: Years Ended December 31, 2022 2021 2020 Stock-based compensation expense related to: (in millions) Stock options $ — $ — $ — RSUs 2.6 3.4 3.0 PSUs 2.3 5.7 6.4 Total 4.9 9.1 9.4 Less: related tax benefit 1.0 1.8 2.0 Net stock-based compensation expense $ 3.9 $ 7.3 $ 7.4 Stock Options No stock options were granted in 2022, 2021 or 2020. The Company anticipates issuing new shares of common stock upon the exercise of its outstanding stock options. Changes in outstanding stock options for the year ended December 31, 2022 were as follows: Number of Stock Options Weighted-Average Price Weighted Average Remaining Contractual Life Stock options outstanding at January 1, 2020 154,016 $ 23.65 1.7 years Exercised (40,800) 22.08 Stock options outstanding at December 31, 2020 113,216 24.21 1.2 years Exercised (48,051) 21.84 Stock options outstanding at December 31, 2021 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 Exercisable at December 31, 2022 23,500 27.72 0.2 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: 2022 2021 2020 (in millions) Fair value of stock options vested $ — $ — $ 0.1 Intrinsic value of outstanding stock options 0.4 1.0 0.9 Intrinsic value of exercisable stock options 0.4 1.0 0.9 The intrinsic value of stock options exercised was $0.7 million, $0.6 million, and $0.8 million for the years ended December 31, 2022, 2021, and 2020. RSUs The Company has awarded RSUs to non-employee members of the Board of Directors and certain employees of the Company. The RSUs awarded to non-employee members of the Board of Directors 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 vested. RSUs awarded to employees of the Company typically have a service vesting period of approximately four years from the date awarded and vest 25% on or after each of the subsequent four anniversaries of such date. These 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 for the year ended December 31, 2022 were as follows: Number of RSUs Weighted Average Grant Date Fair Value RSUs outstanding at January 1, 2020 241,905 $ 32.45 Granted 100,491 36.01 Forfeited (7,710) 38.94 Vested (90,342) 34.76 RSUs outstanding at December 31, 2020 244,344 35.08 Granted 86,020 38.29 Forfeited (35,730) 38.78 Vested (96,508) 37.71 RSUs outstanding at December 31, 2021 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 Vested but unsettled RSUs at December 31, 2022 74,889 29.24 At December 31, 2022, the Company had yet to recognize $5.6 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: 2022 2021 2020 (in millions) Grant date fair value of RSUs vested $ 1.9 $ 3.6 $ 3.1 Intrinsic value of RSUs vested 2.1 3.8 3.0 The intrinsic value of outstanding RSUs was $11.1 million, $8.2 million, and $7.9 million at December 31, 2022, 2021, and 2020. 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 2020 (1) 105,180 37.81 4.0 March 2021 (1) 77,320 37.54 2.9 April 2021 (1) 980 43.29 — August 2021 (1) 779 41.72 — March 2022 (1) 73,120 40.54 3.0 (1) The PSUs awarded in March 2020, 2021 and 2022, April 2021 and August 2021 were awarded and have a performance period of two years followed by an additional one year vesting period. The 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, 2022, the Company had yet to recognize $1.9 million of expense related to PSU grants and expects to recognize the remaining expense on a straight-line basis over the next 24 months. This is based on the expectation of the Company achieving a 179% of target rate for the 2020 PSUs, a 140% of target rate for the 2021 PSUs, and a 26% of target rate for the 2022 PSUs.

Statutory Matters

Statutory Matters	12 Months Ended
	Dec. 31, 2022
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, 2022 2021 (in millions) Capital stock and unassigned surplus $ 696.7 $ 726.0 Paid in capital 243.2 363.2 Total statutory surplus $ 939.9 $ 1,089.2 Net income provided from the Company's insurance subsidiaries prepared in accordance with SAP was $105.1 million, $94.9 million, and $140.4 million, for the years ended December 31, 2022, 2021, and 2020, respectively. Treatment of the LPT Agreement, deferred policy acquisition costs, fair value of financial instruments, and the surplus notes (see Notes 4, 10, and 11) are the primary differences in the SAP-basis capital stock and total surplus of the insurance subsidiaries of $939.9 million and $1,089.2 million, and the GAAP-basis equity of the Company of $944.2 million and $1,213.1 million as of December 31, 2022 and 2021, 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, the surplus notes are recorded as a separate component of surplus. Under SAP, changes to the estimated contingent profit commission under the LPT Agreement are reflected in commission expense in the period that the estimate is revised. 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 next preceding December 31; or (b) EICN's statutory net income, not including realized capital gains, for the 12-month period ending at the next preceding December 31. As of December 31, 2022, EICN had positive unassigned surplus of $233.7 million. During 2022, EICN paid an ordinary dividend in the amount of $9.7 million to its parent company, EGI. As a result of that payment, EICN cannot pay any dividends through March 23, 2023, and can pay $9.8 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 2022, EAC paid an ordinary dividend in the amount of $23.2 million to its parent company, EGI. As a result of that payment, EAC cannot pay any dividends through July 1, 2023 and $21.0 million thereafter, without regulatory approval from the Florida Office of Insurance Regulation (FOIR), provided that no dividends are paid prior to July 1, 2023. During 2022, EPIC paid an ordinary dividend in the amount of $24.0 million to its parent company, EGI. As a result of that payment, EPIC cannot pay any dividends through July 1, 2023 and can pay $22.9 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, 2022, 2021, and 2020, 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: (a) 10% of the paying company's statutory surplus as regards to policyholders at the preceding December 31; or (b) 100% of net income for the preceding year. During the years ended December 31, 2022, 2021, and 2020, ECIC was in compliance with these requirements. On January 14, 2022, ECIC received regulatory approval from the California DOI to pay an extraordinary distribution, in the amount of $120.0 million, to its parent company, EGI. This distribution was approved by ECIC’s Board of Directors on November 12, 2021 and it was paid to EGI on February 15, 2022. As a result of this distribution, ECIC cannot pay dividends through February 15, 2023, without regulatory approval and can pay $21.0 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 2022, CIC paid an ordinary dividend in the amount of $2.7 million to its parent company, CSI. As a result of that payment, CIC cannot pay any dividends through September 9, 2023, and can pay $4.0 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, 2022, 2021, and 2020, 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, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income, Net	Accumulated Other Comprehensive (Loss) Income Accumulated other comprehensive (loss) income 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) income: Years Ended December 31, 2022 2021 (in millions) Net unrealized (losses) gains on investments, before taxes $ (175.8) $ 76.7 Deferred tax benefit (expense) on net unrealized gains and losses 36.9 (16.1) Total accumulated other comprehensive (loss) income $ (138.9) $ 60.6

Employee Benefit and Retirement

Employee Benefit and Retirement Plans	12 Months Ended
	Dec. 31, 2022
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 $2.0 million, $2.1 million, and $2.3 million for the years ended December 31, 2022, 2021, and 2020, respectively.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Common ShareBasic 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, and stock options were to be exercised. Outstanding RSUs and PSUs awarded to employees are entitled to receive dividend equivalents 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, 2022 2021 2020 (in millions, except share data) Net income $ 48.4 $ 119.3 $ 119.8 Weighted average number of shares outstanding–basic 27,503,941 28,289,118 29,912,063 Effect of dilutive securities: Stock options 11,256 27,033 36,568 PSUs 131,465 237,999 230,831 RSUs 34,326 46,843 25,402 Dilutive potential shares 177,047 311,875 292,801 Weighted average number of shares outstanding–diluted 27,680,988 28,600,993 30,204,864 Diluted earnings per share excludes outstanding options and other common stock equivalents in periods where the inclusion of such options and common stock equivalents would be anti-dilutive. The following table presents options, PSUs, and RSUs that were excluded from diluted earnings per share. Years Ended December 31, 2022 2021 2020 Options, PSUs, and RSUs excluded under the treasury method, as the potential proceeds on settlement or exercise was greater than the value of shares acquired — — 111,386

Segments

Segments	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	Segment Reporting The Company has determined that it has two reportable segments: Employers and Cerity. Each of these segments represents a separate and distinct underwriting platform through which the Company conducts insurance business. The nature and composition of each reportable segment and its Corporate and Other activities are as follows: The Employers segment represents the traditional business offered through the EMPLOYERS brand name through its agents, including business originated from the Company's strategic partnerships and alliances. The Cerity segment represents the business offered under the Cerity brand name, which includes the Company's direct-to-customer business. Corporate and Other activities consist of those holding company expenses that are not considered to be underwriting in nature, the financial impact of the LPT agreement, and legacy business assumed and ceded by CIC. These expenses are not considered to be part of a reportable segment and are not otherwise allocated to a reportable segment. The Company has determined that it is not practicable to report identifiable assets by segment since certain assets are used interchangeably among the segments. The following table summarizes the Company's written premiums and components of net income before income taxes by reportable segment. Employers Cerity Corporate and Other Total (in millions) Year Ended December 31, 2022 Gross premiums written $ 707.5 $ 6.7 $ — $ 714.2 Net premiums written 700.5 6.7 — 707.2 Net premiums earned 672.1 3.1 — 675.2 Net investment income 82.1 4.1 3.6 89.8 Net realized and unrealized losses on investments (44.0) (1.3) (6.5) (51.8) Other income 0.3 — — 0.3 Total revenues 710.5 5.9 (2.9) 713.5 Losses and loss adjustment expenses 397.5 1.8 (8.3) 391.0 Commission expense 95.8 0.1 — 95.9 Underwriting and general and administrative expenses 138.9 13.9 14.5 167.3 Interest and financing expenses 3.0 — 0.5 3.5 Total expenses 635.2 15.8 6.7 657.7 Net income (loss) before income taxes $ 75.3 $ (9.9) $ (9.6) $ 55.8 Employers Cerity Corporate and Other Total (in millions) Year Ended December 31, 2021 Gross premiums written $ 588.2 $ 1.5 $ — $ 589.7 Net premiums written 581.6 1.5 — 583.1 Net premiums earned 573.7 0.7 — 574.4 Net investment income 69.3 2.8 0.6 72.7 Net realized and unrealized gains (losses) on investments 54.5 0.3 (0.2) 54.6 Other income 1.4 — — 1.4 Total revenues 698.9 3.8 0.4 703.1 Losses and loss adjustment expenses 326.2 0.5 (11.5) 315.2 Commission expense 76.1 — — 76.1 Underwriting and general and administrative expenses 131.2 12.9 16.1 160.2 Interest and financing expenses — — 0.5 0.5 Other expenses 4.1 — — 4.1 Total expenses 537.6 13.4 5.1 556.1 Net income (loss) before income taxes $ 161.3 $ (9.6) $ (4.7) $ 147.0 Employers Cerity Corporate and Other Total (in millions) Year Ended December 31, 2020 Gross premiums written $ 579.8 $ 0.3 $ — $ 580.1 Net premiums written 574.6 0.3 — 574.9 Net premiums earned 615.1 0.2 — 615.3 Net investment income 72.1 3.1 1.1 76.3 Net realized and unrealized gains (losses) on investments 20.9 — (1.9) 19.0 Other income 0.8 — — 0.8 Total revenues 708.9 3.3 (0.8) 711.4 Losses and loss adjustment expenses 314.2 0.1 (11.9) 302.4 Commission expense 78.8 — — 78.8 Underwriting and general and administrative expenses 151.1 16.6 13.6 181.3 Interest and financing expenses 0.1 — 0.3 0.4 Other expenses 0.7 0.1 — 0.8 Total expenses 544.9 16.8 2.0 563.7 Net income (loss) before income taxes $ 164.0 $ (13.5) $ (2.8) $ 147.7 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: 2022 2021 2020 State In-force Premiums Policies In-force Premiums Policies In-force Premiums Policies (dollars in millions) California $ 279.7 42,876 $ 258.4 40,704 $ 262.0 39,610 Florida 49.4 9,417 41.1 7,989 37.9 6,898 New York 27.3 7,497 24.5 7,307 26.7 6,657 Other (43 states and D.C.) 266.1 61,566 247.4 55,350 251.3 50,341 Total $ 622.5 121,356 $ 571.4 111,350 $ 577.9 103,506 Estimated audit premium 42.5 — 41.6 — (2.7) — Total, including estimated audit premium $ 665.0 121,356 $ 612.9 111,350 $ 575.2 103,506

Schedule II. Condensed Financia

Schedule II. Condensed Financial Information of Registrant	12 Months Ended
	Dec. 31, 2022
Notes to Condensed Financial Statments [Abstract]
Schedule II. Condensed Financial Information of Registrant	Employers Holdings, Inc. Condensed Balance Sheets December 31, 2022 2021 Assets (in millions, except share data) Investments: Investment in subsidiaries $ 856.3 $ 1,172.7 Fixed maturity securities at fair value (amortized cost $7.9 at December 31, 2022 and $9.1 at December 31, 2021) 7.9 10.1 Equity securities at fair value (cost $37.5 at December 31, 2022 and $25.2 at December 31, 2021) 33.0 25.0 Short-term investments at fair value (amortized cost $20.7 at December 31, 2022) 20.7 — Total investments 917.9 1,207.8 Cash and cash equivalents 37.3 4.8 Accrued investment income 0.4 0.2 Intercompany receivable 0.1 0.1 Federal income taxes receivable — 1.5 Deferred income taxes, net 2.9 2.1 Other assets 0.7 0.9 Total assets $ 959.3 $ 1,217.4 Liabilities and stockholders' equity Accounts payable and accrued expenses $ 6.2 $ 4.3 Intercompany payable 0.6 — Other liabilities 8.3 — Total liabilities 15.1 4.3 Stockholders' equity : Common stock, $0.01 par value; 150,000,000 shares authorized; 57,876,287 and 57,690,254 shares issued and 27,160,748 and 27,741,400 shares outstanding at December 31, 2022 and 2021, respectively 0.6 0.6 Additional paid-in capital 414.6 410.7 Retained earnings 1,295.6 1,338.5 Accumulated other comprehensive (loss) income, net of tax (138.9) 60.6 Treasury stock, at cost (30,715,539 shares at December 31, 2022 and 29,948,854 shares at December 31, 2021) (627.7) (597.3) Total stockholders' equity 944.2 1,213.1 Total liabilities and stockholders' equity $ 959.3 $ 1,217.4 Employers Holdings, Inc. Condensed Statements of Income Years Ended December 31, 2022 2021 2020 (in millions, except per share data) Revenues Net investment income $ 3.6 $ 0.6 $ 1.1 Net realized and unrealized (losses) gains on investments (6.5) (0.2) (1.9) Total revenues (2.9) 0.4 (0.8) Expenses Underwriting and general and administrative expenses 13.5 15.0 16.8 Interest and financing expenses 0.5 0.5 0.3 Total expenses 14.0 16.7 17.1 Loss before income taxes and equity in earnings of subsidiaries (16.9) (16.3) (17.9) Income tax benefit (3.4) (3.1) (3.2) Net loss before equity in earnings of subsidiaries (13.5) (13.2) (14.7) Equity in earnings of subsidiaries 61.9 132.5 134.5 Net income $ 48.4 $ 119.3 $ 119.8 Earnings per common share: Basic $ 1.76 $ 4.22 $ 4.01 Diluted $ 1.75 $ 4.17 $ 3.97 Cash dividends declared per common share and eligible equity plan holders $ 3.28 $ 1.00 $ 1.00 Employers Holdings, Inc. Condensed Statement of Cash Flows Years Ended December 31, 2022 2021 2020 (in millions) Operating activities Net income $ 48.4 $ 119.3 $ 119.8 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries 117.6 (40.9) (39.9) Net realized and unrealized losses on investments 6.5 0.2 1.9 Stock-based compensation 5.1 9.1 9.7 Net amortization on investments 0.1 0.1 0.1 Deferred income tax expense (0.5) (0.2) 0.8 Change in operating assets and liabilities: Accounts payable, accrued expenses, and other liabilities 0.8 0.3 (2.5) Federal income taxes 9.8 (0.7) 3.5 Other assets 0.2 (0.4) (0.5) Intercompany payables and receivables 0.6 (0.1) 3.5 Other (0.1) (0.1) (0.3) Net cash provided by operating activities 188.5 86.6 96.1 Investing activities Purchases of fixed maturity securities (14.7) — (3.2) Purchases of equity securities (40.2) (35.0) (3.0) Purchases of short-term securities (24.7) — — Proceeds from sale of fixed maturity securities 16.0 0.4 14.9 Proceeds from sale of equity securities 25.5 10.3 29.0 Proceeds from maturities and redemptions of short-term investments 4.0 — 3.8 Net change in unsettled investment purchases and sales — 5.8 (4.4) Capital contributions to subsidiaries — — (0.4) Net cash (used in) provided by investing activities (34.1) (18.5) 36.7 Financing activities Acquisition of common stock (30.4) (42.6) (99.4) Cash transactions related to stock-based compensation (1.2) (2.7) (1.8) Dividends paid to stockholders and eligible plan award holders (90.3) (29.0) (30.5) Proceeds from line of credit advances 10.0 27.0 — Repayments on line of credit advances (10.0) (27.0) — Net cash used in financing activities (121.9) (74.3) (131.7) Net increase (decrease) in cash and cash equivalents 32.5 (6.2) 1.1 Cash and cash equivalents at the beginning of the period 4.8 11.0 9.9 Cash and cash equivalents at the end of the period $ 37.3 $ 4.8 $ 11.0

Schedule VI. Supplemental Infor

Schedule VI. Supplemental Information (Notes)	12 Months Ended
	Dec. 31, 2022
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) Employers Segment 2022 $ 48.1 $ 1,918.5 $ 335.1 $ 672.1 $ 82.1 $ 430.9 $ (33.4) $ 106.4 $ 387.8 $ 700.5 2021 43.7 1,938.0 303.9 573.7 69.3 366.0 (39.8) 92.2 394.8 581.6 2020 43.2 2,024.5 298.9 615.1 72.1 395.8 (81.6) 97.5 402.2 574.6 Cerity Segment 2022 $ 0.2 $ 1.9 $ 4.4 $ 3.1 $ 4.1 $ 1.9 $ (0.1) $ — $ 0.5 $ 6.7 2021 — 0.6 0.8 0.7 2.8 0.5 — — — 1.5 2020 — 0.1 0.2 0.2 3.1 0.1 — — — 0.3 Corporate & Other 2022 $ — $ 40.2 $ — $ — $ 3.6 $ — $ (8.3) $ — $ (8.3) $ — 2021 — 42.6 — — 0.6 — (11.5) — (11.5) — 2020 — 44.8 — — 1.1 — (11.9) — (11.9) —

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
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, 2022 and 2021 the Company held $2.7 million and $3.1 million, respectively, 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) income 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. 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 either net asset value or fair value and changes in the value of these investments are included in Net realized and unrealized (losses) gains on investments on the Company's Consolidated Statements of Comprehensive Income. Beginning in 2020, with the adoption of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) , 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 (losses) gains on investments on the Company's Consolidated Statements of Comprehensive Income (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 earned, over the period of the contract in proportion to the amount of insurance protection provided. At the end of the policy term, payroll-based 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, economic conditions, and seasonality, and are continually reviewed and adjusted as experience develops or new information becomes known. Any such adjustments are included in current operations; however, they 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 $38.7 million and $13.8 million of additional premiums expected to be received from policyholders for premium audits at December 31, 2022 and 2021, 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. 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 $12.8 million and $10.3 million at December 31, 2022 and 2021, respectively. The Company had write offs of $2.0 million, $2.5 million, and $6.8 million for the years ended December 31, 2022, 2021, and 2020, 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, 2022, 2021, and 2020, was $106.4 million, $92.2 million, and $97.5 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, 2022, 2021, and 2020.
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. Additionally, the Company is 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 $444.5 million and $476.3 million at December 31, 2022 and 2021, respectively. Beginning in 2020, with the adoption of ASU 2016-13 , 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 (Loss) Income (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. 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, 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 is entitled to receive a contingent profit commission under the LPT Agreement. The contingent profit commission is 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 June 30, 2024. The contingent profit commission is paid every five years beginning June 30, 2004 for the first 25 years of the agreement. The Company could be required to return any previously received contingent profit commission, plus interest, in the event of unfavorable differences through June 30,
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 three to seven years. Leasehold improvements are also 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 three to eight 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, 2022 and 2021, 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. The Company also obtains collateral from its reinsurers in order to mitigate the risks related to insolvencies. At December 31, 2022 and 2021, $1.7 million and $1.8 million were held as collateral by cash or letters of credit for the Company's reinsurance recoverables, respectively.
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 around the fourth quarter of each year. At the end of each quarter, management 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, 2022 and 2021. Intangible assets related to state licenses are not subject to amortization. Intangibles related to insurance relationships were amortized in proportion to the expected period of benefit and were fully amortized as of December 31, 2022. 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: 2022 2021 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 2022 or 2021. Amortization expenses are included in the Company's Consolidated Statements of Comprehensive (Loss) Income 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 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, 2022
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: 2022 2021 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, 2022
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: 2022 2021 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial assets (in millions) Total investments at fair value (Note 5) $ 2,502.4 $ 2,502.4 $ 2,692.0 $ 2,692.0 Cash and cash equivalents 89.2 89.2 75.1 75.1 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, 2022 December 31, 2021 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 (in millions) Fixed maturity securities U.S. Treasuries $ — $ 90.8 $ — $ — $ 65.7 $ — U.S. Agencies — 2.1 — — 2.4 — States and municipalities — 317.6 — — 436.1 — Corporate securities — 851.9 16.2 — 1,080.3 — Residential mortgage-backed securities — 360.2 — — 321.8 — Commercial mortgage-backed securities — 55.1 — — 92.3 — Asset-backed securities — 58.1 8.0 — 68.5 — Collateralized loan obligations — 260.9 — — 85.4 — Foreign government securities — 10.2 — — 12.5 — Other securities — 155.2 — — 177.7 — Total fixed maturity securities $ — $ 2,162.1 $ 24.2 $ — $ 2,342.7 $ — Equity securities at fair value Industrial and miscellaneous $ 165.3 $ — $ — $ 283.1 $ — $ — Other 31.5 0.2 — 55.7 — — Total equity securities at fair value $ 196.8 $ 0.2 $ — $ 338.8 $ — $ — Short-term investments $ 119.1 $ — $ — $ — $ 10.5 $ — Total investments at fair value $ 315.9 $ 2,162.3 $ 24.2 $ 338.8 $ 2,353.2 $ —
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, 2022 December 31, 2021 Cash equivalents measured at NAV 65.5 29.5 Other invested assets carried at NAV 59.7 38.4
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 for the year ended December 31, 2022. Level 3 Securities (in millions) Beginning balance, January 1, 2022 $ — Purchases 25.8 Unrealized losses included in comprehensive (loss) income (1.6) Ending balance, December 31, 2022 $ 24.2

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2022
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 Current Expected Credit Losses Gross Gross Estimated At December 31, 2022 (in millions) Fixed maturity securities U.S. Treasuries $ 95.1 $ — $ 0.1 $ (4.4) $ 90.8 U.S. Agencies 2.2 — — (0.1) 2.1 States and municipalities 326.7 — 0.8 (9.9) 317.6 Corporate securities 963.4 (2.8) 2.0 (94.5) 868.1 Residential mortgage-backed securities 403.5 — 0.3 (43.6) 360.2 Commercial mortgage-backed securities 61.5 — — (6.4) 55.1 Asset-backed securities 74.0 — 0.1 (8.0) 66.1 Collateralized loan obligations 268.1 — — (7.2) 260.9 Foreign government securities 13.0 — — (2.8) 10.2 Other securities (1) 159.2 (1.7) 0.6 (2.9) 155.2 Total fixed maturity securities 2,366.7 (4.5) 3.9 (179.8) 2,186.3 Short-term investments 119.1 — — — 119.1 Total AFS investments $ 2,485.8 $ (4.5) $ 3.9 $ (179.8) $ 2,305.4 At December 31, 2021 Fixed maturity securities U.S. Treasuries $ 64.3 $ — $ 1.6 $ (0.2) $ 65.7 U.S. Agencies 2.2 — 0.2 — 2.4 States and municipalities 413.8 — 22.4 (0.1) 436.1 Corporate securities 1,035.3 (0.2) 47.0 (1.8) 1,080.3 Residential mortgage-backed securities 319.0 — 7.0 (4.2) 321.8 Commercial mortgage-backed securities 87.9 — 4.5 (0.1) 92.3 Asset-backed securities 68.6 — 0.4 (0.5) 68.5 Collateralized loan obligations 85.5 — — (0.1) 85.4 Foreign government securities 12.7 — — (0.2) 12.5 Other securities (1) 177.0 — 1.2 (0.5) 177.7 Total fixed maturity securities 2,266.3 (0.2) 84.3 (7.7) 2,342.7 Short-term investments 10.5 — — — 10.5 Total AFS investments $ 2,276.8 $ (0.2) $ 84.3 $ (7.7) $ 2,353.2 (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, 2022 and 2021 were as follows: Cost Estimated Fair Value (in millions) At December 31, 2022 Equity securities at fair value Industrial and miscellaneous $ 115.3 $ 165.3 Other 28.9 31.7 Total equity securities at fair value $ 144.2 $ 197.0 At December 31, 2021 Equity securities at fair value Industrial and miscellaneous $ 170.5 $ 283.1 Other 42.1 55.7 Total equity securities at fair value $ 212.6 $ 338.8
Investments classified by contractual maturity date table	The amortized cost and estimated fair value of the Company's fixed maturity securities at December 31, 2022, 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 $ 69.3 $ 68.7 Due after one year through five years 808.2 776.0 Due after five years through ten years 595.7 529.9 Due after ten years 81.9 69.4 Mortgage and asset-backed securities 807.1 742.3 Total $ 2,362.2 $ 2,186.3
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 as of December 31, 2022 and 2021. December 31, 2022 December 31, 2021 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 $ 76.8 $ (3.5) 13 $ 12.8 $ (0.2) 4 U.S. Agencies 2.1 (0.1) 1 — — — States and municipalities 193.4 (9.0) 68 7.7 (0.1) 4 Corporate securities 763.3 (76.4) 335 113.0 (1.8) 87 Residential mortgage-backed securities 236.8 (17.9) 186 146.3 (3.9) 65 Commercial mortgage-backed securities 52.5 (5.7) 22 — — — Asset-backed securities 27.6 (2.6) 22 50.1 (0.5) 14 Collateralized loan obligations 209.9 (5.5) 37 24.4 (0.1) 10 Foreign government securities — — — 12.5 (0.2) 2 Other securities 81.6 (1.8) 224 66.3 (0.4) 176 Total fixed maturity securities 1,644.0 (122.5) 908 433.1 (7.2) 362 Total less than 12 months $ 1,644.0 $ (122.5) 908 $ 433.1 $ (7.2) 362 12 months or greater: Fixed maturity securities U.S. Treasuries $ 11.2 $ (0.9) 4 $ — $ — — States and municipalities 5.4 (0.9) 3 — — — Corporate securities 84.6 (18.1) 84 — — — Residential mortgage-backed securities 106.6 (25.7) 65 4.9 (0.3) 3 Commercial mortgage-backed securities 2.6 (0.7) 3 2.4 (0.1) 2 Asset-backed securities 27.7 (5.4) 11 — — — Collateralized loan obligations 36.9 (1.7) 11 — — — Foreign government securities 10.2 (2.8) 3 — — — Other securities 38.4 (1.1) 119 8.0 (0.1) 29 Total fixed maturity securities 323.6 (57.3) 303 15.3 (0.5) 34 Total 12 months or greater $ 323.6 $ (57.3) 303 $ 15.3 $ (0.5) 34
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 (Increase) Decrease Change in CECL Allowance Change in Net Unrealized Gains (Losses) Changes in Fair Value Reflected in Earnings Changes in Fair Value Reflected in AOCI, before tax (in millions) 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 — Short-term investments — — — — — — Total investments $ 44.4 $ (19.6) $ (4.3) $ (324.8) $ (51.8) $ (252.5) Year Ended December 31, 2021 Fixed maturity securities $ 4.7 $ (1.1) $ 0.5 $ (68.9) $ 4.1 $ (68.9) Equity securities 20.6 (5.0) — 30.0 45.6 — Other invested assets — — — 4.9 4.9 — Short-term investments — — — (0.1) — (0.1) Total investments $ 25.3 $ (6.1) $ 0.5 $ (34.1) $ 54.6 $ (69.0) Year Ended December 31, 2020 Fixed maturity securities $ 9.2 $ (4.1) $ (0.7) $ 63.0 $ 4.4 $ 63.0 Equity securities 42.6 (21.8) — (5.0) 15.8 — Other invested assets — — — (1.3) (1.3) — Short-term investments 0.1 — — 0.1 0.1 0.1 Total investments $ 51.9 $ (25.9) $ (0.7) $ 56.8 $ 19.0 $ 63.1
Investment income table	Net investment income was as follows: Years Ended December 31, 2022 2021 2020 (in millions) Fixed maturity securities $ 81.1 $ 69.8 $ 72.6 Equity securities 8.3 5.4 4.4 Other invested assets 2.8 2.7 2.8 Short-term investments 0.2 0.2 1.5 Cash equivalents and restricted cash 2.1 — 0.5 Gross investment income 94.5 78.1 81.8 Investment expenses (4.7) (5.4) (5.5) Net investment income $ 89.8 $ 72.7 $ 76.3

Credit Losses (Tables)

Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2022
Credit Loss [Abstract]
Premium Receivable, Allowance for Credit Loss	The table below shows the changes in the allowance for CECL on premiums receivable. Years Ended December 31, 2022 2021 (in millions) Beginning balance of the allowance for CECL on premiums receivable $ 10.3 $ 10.8 Current period provision for CECL 9.6 10.6 Write-offs charged against the allowance (2.0) (2.5) Recoveries collected (5.1) (8.6) Ending balance of the allowance for CECL on premiums receivable $ 12.8 $ 10.3
Reinsurance Recoverable, Allowance for Credit Loss	The table below shows the changes in the allowance for CECL on reinsurance recoverables. Years Ended December 31, 2022 2021 (in millions) Beginning balance of the allowance for CECL on reinsurance recoverables $ 0.6 $ 0.4 Current period provision for CECL 0.3 0.2 Ending balance of the allowance for CECL on reinsurance recoverables $ 0.9 $ 0.6
Debt Securities, Available-for-sale, Allowance for Credit Loss	The table below shows the changes in the allowance for CECL on AFS securities. Years Ended December 31, 2022 2021 (in millions) Beginning balance of the allowance for CECL on AFS securities $ 0.2 $ 0.7 Current period provision for CECL 4.5 — Reductions in allowance from disposals — (0.2) Recoveries of amounts previously written off (0.2) (0.3) Ending balance of the allowance for CECL on AFS securities $ 4.5 $ 0.2

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Property and Equipment [Abstract]
Property, plant and equipment table	Property and equipment consists of the following: As of December 31, 2022 2021 (in millions) Furniture and equipment $ 3.3 $ 3.3 Leasehold improvements 5.0 5.0 Computers and software 47.6 46.8 Automobiles 0.8 0.8 Property and equipment, gross 56.7 55.9 Accumulated depreciation (44.7) (41.2) Property and equipment, net $ 12.0 $ 14.7

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Taxes [Abstract]
Summary of income tax contingencies table	The Company's provision for income taxes consisted of the following: Years Ended December 31, 2022 2021 2020 Current tax expense: (in millions) Federal $ 23.6 $ 20.2 $ 27.6 State 1.1 0.8 0.7 Total current tax expense 24.7 21.0 28.3 Deferred federal tax expense: Other (17.3) 6.7 (0.4) Total deferred federal tax expense (17.3) 6.7 (0.4) Income tax expense $ 7.4 $ 27.7 $ 27.9
Reconciliation of federal staturoty income tax rates to the effective tax rates table	The differences 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 were as follows: Years Ended December 31, 2022 2021 2020 (in millions) Expense computed at statutory rate $ 11.7 $ 31.0 $ 31.0 Tax-advantaged investment income (1.4) (1.7) (1.9) LPT deferred gain amortization (1.7) (1.9) (2.2) Stock based compensation (0.1) 0.1 (0.2) LPT Reserve Adjustment — (0.5) (0.3) Pre-Privatization reserve adjustments, excluding LPT (0.9) (0.5) (0.4) Other (0.2) 1.2 1.9 Income tax expense $ 7.4 $ 27.7 $ 27.9
Deferred tax assets and liabilities	The significant components of deferred income taxes, net, were as follows as of December 31: 2022 2021 Deferred Tax Deferred Tax Assets Liabilities Assets Liabilities (in millions) Unrealized capital gains and losses, net $ 24.7 $ — $ — $ 43.5 Deferred policy acquisition costs — 10.3 — 9.4 Intangible assets — 1.6 — 1.6 Loss reserve discounting for tax reporting 31.2 — 30.0 — Unearned premiums 13.2 — 11.9 — Allowance for bad debt 2.9 — 2.3 — Stock-based compensation 1.8 — 2.5 — Accrued liabilities 4.6 — 4.1 — Operating leases 2.9 2.4 3.5 3.0 Other 3.2 7.5 2.2 6.7 Total $ 84.5 $ 21.8 $ 56.5 $ 64.2 Deferred income tax asset (liability), net $ 62.7 $ (7.7)

Liability for Unpaid Losses a_2

Liability for Unpaid Losses and Loss Adjustment Expenses (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 2021 2020 (in millions) Unpaid losses and LAE at beginning of period $ 1,981.2 $ 2,069.4 $ 2,192.8 Less reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 476.9 497.0 532.5 Net unpaid losses and LAE at beginning of period 1,504.3 1,572.4 1,660.3 Losses and LAE, net of reinsurance, incurred during the period related to: Current year 432.8 366.5 395.9 Prior years (33.5) (39.8) (81.6) Total net losses and LAE incurred during the period 399.3 326.7 314.3 Paid losses and LAE, net of reinsurance, related to: Current year 92.5 76.6 83.6 Prior years 295.8 318.2 318.6 Total net paid losses and LAE during the period 388.3 394.8 402.2 Ending unpaid losses and LAE, net of reinsurance 1,515.3 1,504.3 1,572.4 Reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE 445.4 476.9 497.0 Unpaid losses and LAE at end of period $ 1,960.7 $ 1,981.2 $ 2,069.4
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, 2022 for each of the previous 10 accident years. Incurred Losses and DCC, Net of Reinsurance Years Ended December 31, As of December 31, 2022 Accident Year 2013 (1) 2014 (1) 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 (1) 2020 (1) 2021 (1) 2022 IBNR Cumulative number of reported claims (in millions, except claims counts) 2013 $ 452.6 $ 460.6 $ 478.6 $ 472.6 $ 468.9 $ 464.6 $ 459.3 $ 446.8 $ 440.9 $ 436.9 $ 24.6 28,941 2014 463.4 445.8 432.9 434.6 430.5 424.7 415.5 406.0 402.1 28.6 28,598 2015 422.2 425.8 423.9 419.6 408.7 396.7 384.9 381.9 28.5 27,273 2016 419.0 414.6 395.4 375.0 364.6 354.8 350.4 28.4 25,820 2017 412.4 391.3 358.3 337.9 329.8 326.9 35.8 25,121 2018 422.5 424.6 407.7 400.6 400.5 35.4 28,008 2019 422.4 435.7 448.5 448.8 62.6 32,989 2020 365.7 374.0 373.3 66.9 24,195 2021 339.2 339.0 72.2 22,624 2022 399.3 190.7 20,202 Total $ 3,859.2 Cumulative Paid Losses and DCC, Net of Reinsurance Years Ended December 31, Accident Year 2013 (1) 2014 (1) 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 (1) 2020 (1) 2021 (1) 2022 (in millions) 2013 $ 68.5 $ 184.4 $ 263.8 $ 317.4 $ 346.1 $ 365.9 $ 379.3 $ 386.6 $ 391.3 $ 395.5 2014 65.3 172.7 248.9 297.2 323.4 342.1 351.4 357.7 361.6 2015 65.5 174.5 246.9 290.5 311.2 322.2 329.3 333.7 2016 65.6 166.8 227.7 261.2 278.3 290.0 298.1 2017 63.5 160.2 215.7 243.7 260.0 269.5 2018 77.9 189.9 254.2 293.6 315.2 2019 88.8 212.6 285.2 325.8 2020 71.9 175.6 233.5 2021 66.1 166.8 2022 76.5 Total $ 2,776.2 All outstanding liabilities for unpaid losses and DCC prior to 2013, net of reinsurance 363.8 Total outstanding liabilities for unpaid losses and DCC, net of reinsurance $ 1,446.8 (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, 2022 (in millions) Liabilities for unpaid losses and LAE, net of reinsurance $ 1,446.8 Reinsurance recoverable, excluding CECL allowance, on unpaid losses 445.4 AO 68.5 Total liability for unpaid losses and LAE $ 1,960.7
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, 2022 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 18.4 % 28.1 % 17.3 % 10.4 % 5.6 % 3.7 % 2.4 % 1.5 % 1.0 % 1.0 %

Reinsurance (Tables)

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 2021 2020 Written Earned Written Earned Written Earned (in millions) Direct premiums $ 705.3 $ 673.2 $ 582.6 $ 574.0 $ 570.8 $ 611.0 Assumed premiums 8.9 9.0 7.1 7.0 9.3 9.5 Gross premiums 714.2 682.2 589.7 581.0 580.1 620.5 Ceded premiums (7.0) (7.0) (6.6) (6.6) (5.2) (5.2) Net premiums $ 707.2 $ 675.2 $ 583.1 $ 574.4 $ 574.9 $ 615.3 Ceded losses and LAE incurred $ 3.5 $ 16.8 $ 5.9 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, 2022
Commitments and Contingencies [Abstract]
Lease, Cost [Table Text Block]	Components of lease expense were as follows: Years Ended December 31, 2022 2021 (in millions) Operating lease expense $ 3.4 $ 4.1 Finance lease expense 0.2 0.2 Total lease expense $ 3.6 $ 4.3
Operating and capital leases schedule of future minimum lease payments table	Year Operating Leases Finance Leases (in millions) 2023 $ 3.3 $ 0.2 2024 3.2 0.1 2025 3.1 0.1 2026 2.8 — 2027 1.7 — Thereafter 0.2 — Total lease payments 14.3 0.4 Less: imputed interest (0.7) — Total $ 13.6 $ 0.4
Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows: As of December 31, 2022 2021 (in millions) Operating leases: Operating lease right-of-use asset $ 11.5 14.2 Operating lease liability 13.6 16.6 Finance leases: Property and equipment, gross 0.8 0.8 Accumulated depreciation (0.4) (0.3) Property and equipment, net 0.4 0.5 Other liabilities $ 0.4 $ 0.5
Cash Flow, Supplemental Disclosures [Text Block]	Supplemental cash flow information related to leases was as follows: Years Ended December 31, 2022 2021 (in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 3.4 $ 4.1 Financing cash flows used for finance leases 0.2 0.1

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
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 was as follows: Years Ended December 31, 2022 2021 2020 Stock-based compensation expense related to: (in millions) Stock options $ — $ — $ — RSUs 2.6 3.4 3.0 PSUs 2.3 5.7 6.4 Total 4.9 9.1 9.4 Less: related tax benefit 1.0 1.8 2.0 Net stock-based compensation expense $ 3.9 $ 7.3 $ 7.4
Schedule of share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding table	Changes in outstanding stock options for the year ended December 31, 2022 were as follows: Number of Stock Options Weighted-Average Price Weighted Average Remaining Contractual Life Stock options outstanding at January 1, 2020 154,016 $ 23.65 1.7 years Exercised (40,800) 22.08 Stock options outstanding at December 31, 2020 113,216 24.21 1.2 years Exercised (48,051) 21.84 Stock options outstanding at December 31, 2021 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 Exercisable at December 31, 2022 23,500 27.72 0.2 years
Schedule of fair value of options vested and instrinsic value of outstanding and exercisable options table	he fair value of stock options vested and the intrinsic value of outstanding and exercisable stock options as of December 31, were as follows: 2022 2021 2020 (in millions) Fair value of stock options vested $ — $ — $ 0.1 Intrinsic value of outstanding stock options 0.4 1.0 0.9 Intrinsic value of exercisable stock options 0.4 1.0 0.9
Schedule of share-based compensation, restricted stock and restricted stock units activity	Changes in outstanding RSUs for the year ended December 31, 2022 were as follows: Number of RSUs Weighted Average Grant Date Fair Value RSUs outstanding at January 1, 2020 241,905 $ 32.45 Granted 100,491 36.01 Forfeited (7,710) 38.94 Vested (90,342) 34.76 RSUs outstanding at December 31, 2020 244,344 35.08 Granted 86,020 38.29 Forfeited (35,730) 38.78 Vested (96,508) 37.71 RSUs outstanding at December 31, 2021 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 Vested but unsettled RSUs at December 31, 2022 74,889 29.24
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: 2022 2021 2020 (in millions) Grant date fair value of RSUs vested $ 1.9 $ 3.6 $ 3.1 Intrinsic value of RSUs vested 2.1 3.8 3.0
PSUs awarded to certain officers table	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 2020 (1) 105,180 37.81 4.0 March 2021 (1) 77,320 37.54 2.9 April 2021 (1) 980 43.29 — August 2021 (1) 779 41.72 — March 2022 (1) 73,120 40.54 3.0 (1) The PSUs awarded in March 2020, 2021 and 2022, April 2021 and August 2021 were awarded and have a performance period of two years followed by an additional one year vesting period. The 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, 2022
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, 2022 2021 (in millions) Capital stock and unassigned surplus $ 696.7 $ 726.0 Paid in capital 243.2 363.2 Total statutory surplus $ 939.9 $ 1,089.2

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income, Net (Tables)	12 Months Ended
	Dec. 31, 2022
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) income: Years Ended December 31, 2022 2021 (in millions) Net unrealized (losses) gains on investments, before taxes $ (175.8) $ 76.7 Deferred tax benefit (expense) on net unrealized gains and losses 36.9 (16.1) Total accumulated other comprehensive (loss) income $ (138.9) $ 60.6

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 2021 2020 (in millions, except share data) Net income $ 48.4 $ 119.3 $ 119.8 Weighted average number of shares outstanding–basic 27,503,941 28,289,118 29,912,063 Effect of dilutive securities: Stock options 11,256 27,033 36,568 PSUs 131,465 237,999 230,831 RSUs 34,326 46,843 25,402 Dilutive potential shares 177,047 311,875 292,801 Weighted average number of shares outstanding–diluted 27,680,988 28,600,993 30,204,864
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	Diluted earnings per share excludes outstanding options and other common stock equivalents in periods where the inclusion of such options and common stock equivalents would be anti-dilutive. The following table presents options, PSUs, and RSUs that were excluded from diluted earnings per share. Years Ended December 31, 2022 2021 2020 Options, PSUs, and RSUs excluded under the treasury method, as the potential proceeds on settlement or exercise was greater than the value of shares acquired — — 111,386

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]	Employers Cerity Corporate and Other Total (in millions) Year Ended December 31, 2022 Gross premiums written $ 707.5 $ 6.7 $ — $ 714.2 Net premiums written 700.5 6.7 — 707.2 Net premiums earned 672.1 3.1 — 675.2 Net investment income 82.1 4.1 3.6 89.8 Net realized and unrealized losses on investments (44.0) (1.3) (6.5) (51.8) Other income 0.3 — — 0.3 Total revenues 710.5 5.9 (2.9) 713.5 Losses and loss adjustment expenses 397.5 1.8 (8.3) 391.0 Commission expense 95.8 0.1 — 95.9 Underwriting and general and administrative expenses 138.9 13.9 14.5 167.3 Interest and financing expenses 3.0 — 0.5 3.5 Total expenses 635.2 15.8 6.7 657.7 Net income (loss) before income taxes $ 75.3 $ (9.9) $ (9.6) $ 55.8 Employers Cerity Corporate and Other Total (in millions) Year Ended December 31, 2021 Gross premiums written $ 588.2 $ 1.5 $ — $ 589.7 Net premiums written 581.6 1.5 — 583.1 Net premiums earned 573.7 0.7 — 574.4 Net investment income 69.3 2.8 0.6 72.7 Net realized and unrealized gains (losses) on investments 54.5 0.3 (0.2) 54.6 Other income 1.4 — — 1.4 Total revenues 698.9 3.8 0.4 703.1 Losses and loss adjustment expenses 326.2 0.5 (11.5) 315.2 Commission expense 76.1 — — 76.1 Underwriting and general and administrative expenses 131.2 12.9 16.1 160.2 Interest and financing expenses — — 0.5 0.5 Other expenses 4.1 — — 4.1 Total expenses 537.6 13.4 5.1 556.1 Net income (loss) before income taxes $ 161.3 $ (9.6) $ (4.7) $ 147.0 Employers Cerity Corporate and Other Total (in millions) Year Ended December 31, 2020 Gross premiums written $ 579.8 $ 0.3 $ — $ 580.1 Net premiums written 574.6 0.3 — 574.9 Net premiums earned 615.1 0.2 — 615.3 Net investment income 72.1 3.1 1.1 76.3 Net realized and unrealized gains (losses) on investments 20.9 — (1.9) 19.0 Other income 0.8 — — 0.8 Total revenues 708.9 3.3 (0.8) 711.4 Losses and loss adjustment expenses 314.2 0.1 (11.9) 302.4 Commission expense 78.8 — — 78.8 Underwriting and general and administrative expenses 151.1 16.6 13.6 181.3 Interest and financing expenses 0.1 — 0.3 0.4 Other expenses 0.7 0.1 — 0.8 Total expenses 544.9 16.8 2.0 563.7 Net income (loss) before income taxes $ 164.0 $ (13.5) $ (2.8) $ 147.7
Revenue from External Customers by Geographic Areas [Table Text Block]	2022 2021 2020 State In-force Premiums Policies In-force Premiums Policies In-force Premiums Policies (dollars in millions) California $ 279.7 42,876 $ 258.4 40,704 $ 262.0 39,610 Florida 49.4 9,417 41.1 7,989 37.9 6,898 New York 27.3 7,497 24.5 7,307 26.7 6,657 Other (43 states and D.C.) 266.1 61,566 247.4 55,350 251.3 50,341 Total $ 622.5 121,356 $ 571.4 111,350 $ 577.9 103,506 Estimated audit premium 42.5 — 41.6 — (2.7) — Total, including estimated audit premium $ 665.0 121,356 $ 612.9 111,350 $ 575.2 103,506

Basis of Presentation Reportabl

Basis of Presentation Reportable Segments (Details)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Number of Reportable Segments	2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Funds held by or deposited with reinsurers	$ 2.7	$ 3.1
Restricted cash and cash equivalents	0.2	0.2
Premiums receivable from policyholders for final audit	38.7	13.8
Premium Receivable, Allowance for Credit Loss	12.8	10.3	$ 10.8
Write-offs, net of recoveries of amounts previously written off	2	2.5	6.8
Premium Deficiency	0	0	0
Unpaid losses	$ 444.5	476.3
LPT - loss expense as a percentange of losses paid, for management of LPT claims	7%
LPT favorable/ unfavorable difference, percentage	30%
LPT actual amounts paid versus expected amounts, period	every five years
LPT actual amounts paid versus expected amounts, expiration period	25
Collateralized by cash or letter of credit	$ 1.7	1.8
Goodwill and other intangible asset impairment	0	0
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, gross carrying amount	23	23
Intangible assets, accumulated amortization	(9.4)	(9.4)
Intangible assets, net	13.6	13.6
Amortization of intangible assets	$ 0	0
Income Tax Examination, Likelihood of Unfavorable Settlement	50
Employers Segment [Member]
Deferred policy acquisition cost, amortization expense	$ 106.4	92.2	$ 97.5
Funds Held in Trust, Reinsurance Agreement [Domain]
Restricted cash and cash equivalents	0.2
Licensing Agreements [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, gross carrying amount	13.5	13.5
Intangible assets, accumulated amortization	0	0
Intangible assets, net	13.5	13.5
Service Agreements [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, gross carrying amount	9.4	9.4
Intangible assets, accumulated amortization	(9.4)	(9.4)
Intangible assets, net	0	0
Other Intangible Assets [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, gross carrying amount	0.1
Other Intangible Assets [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, accumulated amortization	0	0
Finite-Lived Intangible Assets, Net	$ 0.1	0.1
Finite-Lived Intangible Assets, Gross		$ 0.1
Electronic Data Processing Equipment, Software, Furniture and Equipment and Automobiles [Member]
Finite-Lived intangible assets, amortization method	straight-line method over three to seven years
Leasehold improvements
Finite-Lived intangible assets, amortization method	amortized over three to eight years
LPT Agreement [Member]
Cash and cash equivalents at fair value				$ 19.1

Fair Value of Financial Instr_3

Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments at fair value	$ 2,502.4	$ 2,692
Total investments at fair value, estimated fair value	2,502.4	2,692
Cash and cash equivalents	89.2	75.1
Cash and cash equivalents, estimated fair value	89.2	75.1
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	$ 55.2	46.4
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, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		$ 2,186.3	$ 2,342.7
Short-Term Investments		119.1	10.5
Investments		2,568.8	2,736
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		315.9	338.8
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		2,162.3	2,353.2
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		24.2	0
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
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		2,162.1	2,342.7
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		24.2	0
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		90.8	65.7
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		90.8	65.7
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	2.4
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		2.1	2.4
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		317.6	436.1
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		317.6	436.1
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		868.1	1,080.3
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		851.9	1,080.3
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		16.2	0
Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		360.2	321.8
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		360.2	321.8
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		55.1	92.3
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		55.1	92.3
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		66.1	68.5
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		58.1	68.5
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		8	0
Other Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	[1]	155.2	177.7
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		155.2	177.7
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
Equity 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]
Equity Securities, FV-NI		196.8	338.8
Equity 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]
Equity Securities, FV-NI		0.2	0
Equity 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]
Equity Securities, FV-NI		0	0
Industrial and miscellaneous
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI		165.3	283.1
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		165.3	283.1
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		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		0	0
Other equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI		31.7	55.7
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		31.5	55.7
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		0.2	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		0	0
Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		119.1	10.5
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		119.1	0
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		0	10.5
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		0	0
Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		260.9	85.4
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		260.9	85.4
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
Sovereign Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value		10.2	12.5
Sovereign Debt Securities | 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
Sovereign Debt Securities | 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		10.2	12.5
Sovereign Debt Securities | 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
[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, 2022	Dec. 31, 2021
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	$ 55.2	$ 46.4
Cash equivalents measured at NAV, which approximates fair value	65.5	29.5
Alternative Investment	$ 59.7	$ 38.4

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, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 24.2	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	25.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	$ (1.6)

Investments Available for Sale

Investments Available for Sale Securities (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		$ 2,366.7	$ 2,266.3
Debt securities, available-for-sale, gross unrealized gain		3.9	84.3
Debt securities, available-for-sale, gross unrealized loss		(179.8)	(7.7)
Fixed maturity securities, fair value		2,186.3	2,342.7
Debt Securities, Available-for-sale, Allowance for Credit Loss		4.5	0.2	$ 0.7
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		95.1	64.3
Debt securities, available-for-sale, gross unrealized gain		0.1	1.6
Debt securities, available-for-sale, gross unrealized loss		(4.4)	(0.2)
Fixed maturity securities, fair value		90.8	65.7
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		2.2	2.2
Debt securities, available-for-sale, gross unrealized gain		0	0.2
Debt securities, available-for-sale, gross unrealized loss		(0.1)	0
Fixed maturity securities, fair value		2.1	2.4
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		326.7	413.8
Debt securities, available-for-sale, gross unrealized gain		0.8	22.4
Debt securities, available-for-sale, gross unrealized loss		(9.9)	(0.1)
Fixed maturity securities, fair value		317.6	436.1
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		963.4	1,035.3
Debt securities, available-for-sale, gross unrealized gain		2	47
Debt securities, available-for-sale, gross unrealized loss		(94.5)	(1.8)
Fixed maturity securities, fair value		868.1	1,080.3
Debt Securities, Available-for-sale, Allowance for Credit Loss		2.8	0.2
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		403.5	319
Debt securities, available-for-sale, gross unrealized gain		0.3	7
Debt securities, available-for-sale, gross unrealized loss		(43.6)	(4.2)
Fixed maturity securities, fair value		360.2	321.8
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		61.5	87.9
Debt securities, available-for-sale, gross unrealized gain		0	4.5
Debt securities, available-for-sale, gross unrealized loss		(6.4)	(0.1)
Fixed maturity securities, fair value		55.1	92.3
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		74	68.6
Debt securities, available-for-sale, gross unrealized gain		0.1	0.4
Debt securities, available-for-sale, gross unrealized loss		(8)	(0.5)
Fixed maturity securities, fair value		66.1	68.5
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Other Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	[1]	159.2	177
Debt securities, available-for-sale, gross unrealized gain	[1]	0.6	1.2
Debt securities, available-for-sale, gross unrealized loss	[1]	(2.9)	(0.5)
Fixed maturity securities, fair value	[1]	155.2	177.7
Debt Securities, Available-for-sale, Allowance for Credit Loss		1.7	0
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		268.1	85.5
Debt securities, available-for-sale, gross unrealized gain		0	0
Debt securities, available-for-sale, gross unrealized loss		(7.2)	(0.1)
Fixed maturity securities, fair value		260.9	85.4
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Sovereign Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		13	12.7
Debt securities, available-for-sale, gross unrealized gain		0	0
Debt securities, available-for-sale, gross unrealized loss		(2.8)	(0.2)
Fixed maturity securities, fair value		10.2	12.5
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost		119.1	10.5
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		119.1	10.5
Debt Securities, Available-for-sale, Allowance for Credit Loss		0	0
Total AFS Investments [Domain]
Debt Securities, Available-for-sale [Line Items]
Total Available for sale Debt Securities and Short-term investments, Cost		2,485.8	2,276.8
Total Available for sale Debt Securities and Short-term investments, Unrealized Gain		3.9	84.3
Total Available for sale Debt Securities and Short-term investments, Unrealized Loss		179.8	7.7
Total Available for sale investments		$ 2,305.4	$ 2,353.2
[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, 2022	Dec. 31, 2021
Equity Securities [Line Items]
Equity securities, cost	$ 144.2	$ 212.6
Equity Securities, FV-NI, Total	197	338.8
Industrial and miscellaneous
Equity Securities [Line Items]
Equity securities, cost	115.3	170.5
Equity Securities, FV-NI	165.3	283.1
Other equities
Equity Securities [Line Items]
Equity securities, cost	28.9	42.1
Equity Securities, FV-NI	$ 31.7	$ 55.7

Investments Other Invested Asse

Investments Other Invested Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Invested Assets [Abstract]
Other Investments, Total	$ 59.7	$ 38.4
Investment Owned, at Cost	$ 54.4	$ 34.1

Investments, Amortized Cost and

Investments, Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less, amortized cost	$ 69.3
Due after one year through five years, amortized cost	808.2
Due after five years through ten years, amortized cost	595.7
Due after ten years, amortized cost	81.9
Mortgage and asset-backed securities, amortized cost	807.1
Debt securities, available-for-sale, amortized cost	2,366.7	$ 2,266.3
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	2,362.2
Estimated Fair Value
Due in one year or less, fair value	68.7
Due after one year through five years, fair value	776
Due after five years through ten years, fair value	529.9
Due after ten years, fair value	69.4
Mortgage and asset-backed securities, fair value	742.3
Fixed maturity securities, fair value	$ 2,186.3	$ 2,342.7

Investments, Continuous Loss Po

Investments, Continuous Loss Position (Details) $ in Millions	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,644	$ 433.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	323.6	15.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(122.5)	(7.2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (57.3)	$ (0.5)
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	908	362
Debt Securities, number of issues in loss position, 12 months or longer | shares	303	34
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 4.5	$ 0.2	$ 0.7
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	76.8	12.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	11.2	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3.5)	(0.2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (0.9)	$ 0
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	13	4
Debt Securities, number of issues in loss position, 12 months or longer | shares	4	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	2.1	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (0.1)	$ 0
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	1	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
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	193.4	7.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	5.4	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(9)	(0.1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (0.9)	$ 0
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	68	4
Debt Securities, number of issues in loss position, 12 months or longer | shares	3	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	763.3	113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	84.6	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(76.4)	(1.8)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (18.1)	$ 0
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	335	87
Debt Securities, number of issues in loss position, 12 months or longer | shares	84	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 2.8	$ 0.2
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	236.8	146.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	106.6	4.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(17.9)	(3.9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (25.7)	$ (0.3)
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	186	65
Debt Securities, number of issues in loss position, 12 months or longer | shares	65	3
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	52.5	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2.6	2.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(5.7)	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (0.7)	$ (0.1)
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	22	0
Debt Securities, number of issues in loss position, 12 months or longer | shares	3	2
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	27.6	50.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	27.7	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2.6)	(0.5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (5.4)	$ 0
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	22	14
Debt Securities, number of issues in loss position, 12 months or longer | shares	11	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	209.9	24.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	36.9	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(5.5)	(0.1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1.7)	$ 0
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	37	10
Debt Securities, number of issues in loss position, 12 months or longer | shares	11	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Other Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	81.6	66.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	38.4	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1.8)	(0.4)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1.1)	$ (0.1)
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	224	176
Debt Securities, number of issues in loss position, 12 months or longer | shares	119	29
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 1.7	$ 0
Sovereign Debt Securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	12.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	10.2	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(0.2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (2.8)	$ 0
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	0	2
Debt Securities, number of issues in loss position, 12 months or longer | shares	3	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0

Investments, Net Realized Gains

Investments, Net Realized Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in unrealized gains (losses)
AFS, change in unrealized gains (losses) on debt securities reflected in AOCI	$ (252.5)	$ (69)	$ 63.1
Total change in net unrealized gains (losses)	(324.8)	(34.1)	56.8
AFS, net realized gains (losses)
Total gross realized gains	44.4	25.3	51.9
Total gross realized losses	(19.6)	(6.1)	(25.9)
Net realized and unrealized (losses) gains on investments	(51.8)	54.6	19
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	(4.3)	0.5	(0.7)
Proceeds from sale of fixed maturity securities	313.8	206.7	349.5
Debt Securities [Member]
Change in unrealized gains (losses)
AFS, change in unrealized gains (losses) on debt securities reflected in AOCI	(252.5)	(68.9)	63
AFS, net realized gains (losses)
Net realized and unrealized (losses) gains on investments	(3.6)	4.1	4.4
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	(4.3)	0.5	(0.7)
Debt Securities, Available-for-sale, Realized Gain	3.2	4.7	9.2
Debt Securities, Available-for-sale, Realized Loss	2.5	1.1	4.1
Equity Securities [Member]
Change in unrealized gains (losses)
AFS, change in unrealized gains (losses) on debt securities reflected in AOCI	0	0	0
Equity securities, FV-NI, unrealized gain (loss)	(73.3)	30	(5)
Equity securities:
Equity securities, FV-NI, realized gain	41.2	20.6	42.6
Equity securities, FV-NI, realized loss	(17.1)	(5)	(21.8)
AFS, net realized gains (losses)
Net realized and unrealized (losses) gains on investments	(49.2)	45.6	15.8
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	0	0	0
Other Investments [Member]
Change in unrealized gains (losses)
AFS, change in unrealized gains (losses) on debt securities reflected in AOCI	0	0	0
AFS, net realized gains (losses)
Net realized and unrealized (losses) gains on investments	1	4.9	(1.3)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	0	0	0
Unrealized Gain (Loss) on Investments	1	4.9	(1.3)
Loss on Sale of Investments	0	0	0
Gain on Sale of Investments	0	0	0
Short-term Investments [Member]
Change in unrealized gains (losses)
AFS, change in unrealized gains (losses) on debt securities reflected in AOCI	0	(0.1)	0.1
AFS, net realized gains (losses)
Net realized and unrealized (losses) gains on investments	0	0	0.1
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	0	0	0
Debt Securities, Available-for-sale, Realized Gain	0	0	0.1
Debt Securities, Available-for-sale, Realized Loss	$ 0	$ 0	$ 0

Net Investment Income (Details)

Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 94.5	$ 78.1	$ 81.8
Investment expenses	(4.7)	(5.4)	(5.5)
Net investment income	89.8	72.7	76.3
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	81.1	69.8	72.6
Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income related to equity securities	8.3	5.4	4.4
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	2.8	2.7	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	0.2	0.2	1.5
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	$ 2.1	$ 0	$ 0.5

Investments Investments, held i

Investments Investments, held in Trust or on Deposit (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deposit Assets [Abstract]
Investments	$ 2,568.8	$ 2,736
Assets Held-in-trust [Abstract]
Funds held by or deposited with reinsurers	2.7	3.1
Required by various state laws and regulations to hold securities or letters of credit in depository account [Member]
Deposit Assets [Abstract]
Investments	$ 745.9	$ 861.4

Credit Losses (Details)

Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Credit Loss [Abstract]
Premium Receivable, Allowance for Credit Loss	$ 12.8	$ 10.3	$ 10.8
Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease)	9.6	10.6
Premium Receivable, Allowance for Credit Loss, Writeoff	(2)	(2.5)
Premium Receivable, Allowance for Credit Loss, Recovery	(5.1)	(8.6)
Reinsurance Recoverable, Allowance for Credit Loss	0.9	0.6	0.4
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease)	0.3	0.2
Debt Securities, Available-for-sale, Allowance for Credit Loss	4.5	0.2	$ 0.7
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	4.5	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0	(0.2)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Recovery	(0.2)	(0.3)
Accrued investment income	$ 19	$ 14.5

Property and Equipment Property

Property and Equipment Property and Equipment breakout (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property and Equipment [Line Items]
Property and equipment, gross	$ 56.7	$ 55.9
Accumulated depreciation, depletion and amortization, property and equipment	44.7	41.2
Property and equipment, net	12	14.7
Payments to develop software	1.2	2.3
Cloud computing arrangements	42.9	43.9
Amortization of cloud computing arrangements	16.4	14.2	$ 9
Depreciation	5.3	7.4	$ 8.2
Furniture and equipment
Property and Equipment [Line Items]
Property and equipment, gross	3.3	3.3
Leasehold improvements
Property and Equipment [Line Items]
Property and equipment, gross	5	5
Computer and software
Property and Equipment [Line Items]
Property and equipment, gross	47.6	46.8
Automobiles
Property and Equipment [Line Items]
Property and equipment, gross	$ 0.8	$ 0.8

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory federal tax rate		21%
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current federal tax expense (benefit)	$ 23.6	$ 20.2	$ 27.6
Current state and local tax expense (benefit)	1.1	0.8	0.7
Current income tax expense (benefit)	24.7	21	28.3
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Routine/other	(17.3)	6.7	(0.4)
Deferred income tax expense (benefit)	(17.3)	6.7	(0.4)
Income tax expense	7.4	27.7	27.9
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Expense computed at statutory rate	11.7	31	31
Dividends received deduction and tax-exempt interest	(1.4)	(1.7)	(1.9)
LPT deferred gain amortization	(1.7)	(1.9)	(2.2)
Stock based compensation	(0.1)	0.1	(0.2)
LPT reserve adjustment	0	(0.5)	(0.3)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(0.9)	(0.5)	(0.4)
Income tax reconciliation, other	(0.2)	1.2	1.9
Net income	48.4	119.3	119.8
Unrecognized tax benefits	0	0	0
Income Taxes Paid, Net	15.1	28.2	18.5
Deferred Tax Liabilities [Abstract]
Unrealized capital gains, net		43.5
Deferred policy acquisition cost	10.3	9.4
Intangible assets	1.6	1.6
Deferred Tax Liabilities, Leasing Arrangements	2.4	3
Other deferred tax liabilities	7.5	6.7
Deferred income taxes, net		(7.7)
Deferred Tax Assets [Abstract]
Loss reserves discounting for tax reporting	31.2	30
Unearned premiums	13.2	11.9
Allowance for bad debt	2.9	2.3
Stock based compensation	1.8	2.5
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	4.6	4.1
Deferred Tax Asset, Leasing Arrangements	2.9	3.5
Deferred Tax Assets, Net	62.7
Other deferred tax assets	3.2	2.2
Deferred Tax Liabilities, Gross	21.8	64.2
Total deferred tax assets	84.5	56.5
Deferred Tax Asset, Debt Securities, Trading, Unrealized Loss	$ 24.7
Change Due to Estimated Reserves Ceded Under the LPT Agreement [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Net income		2.6	1.2
Change to Contingent Profit Commission [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Net income		$ 0.5	$ 0.2

Liability for Unpaid Losses a_3

Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Losses and loss adjustment expenses	$ 391	$ 315.2	$ 302.4
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Unpaid losses and LAE, gross of reinsurance, at beginning of period	1,981.2	2,069.4	2,192.8
Loss reinsurance recoverable, excluding bad debt, on unpaid losses	476.9	497	532.5
Net unpaid losses and LAE at beginning of period	1,504.3	1,572.4	1,660.3
Losses and LAE, net of reinsurance, incurred in:
Current year	432.8	366.5	395.9
Prior years	(33.5)	(39.8)	(81.6)
Total net losses and LAE incurred during the period	399.3	326.7	314.3
Deduct payments for losses and LAE, net of reinsurance, related to:
Current year	92.5	76.6	83.6
Prior years	295.8	318.2	318.6
Total net payments for losses and LAE during the period	388.3	394.8	402.2
Ending unpaid losses and LAE, net of reinsurance	1,515.3	1,504.3	1,572.4
Loss reinsurance recoverable, excluding bad debt, on unpaid losses	445.4	476.9	497
Unpaid losses and LAE, gross of reinsurance, at end of period	1,960.7	1,981.2	2,069.4
Accident Year 2020
Losses and LAE, net of reinsurance, incurred in:
Prior years		8
Accident Year 2019
Losses and LAE, net of reinsurance, incurred in:
Prior years		10	$ 13.3
Voluntary risk business
Losses and LAE, net of reinsurance, incurred in:
Prior years	(32.1)	(38)
Involuntary assigned risk business
Losses and LAE, net of reinsurance, incurred in:
Prior years	$ (1.4)	$ (1.8)

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, 2022 USD ($)	Dec. 31, 2021 USD ($)		Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($)	[1]	Dec. 31, 2018 USD ($)	[1]	Dec. 31, 2017 USD ($)	[1]	Dec. 31, 2016 USD ($)	[1]	Dec. 31, 2015 USD ($)	[1]	Dec. 31, 2014 USD ($)	[1]	Dec. 31, 2013 USD ($)	[1]
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	$ 3,859.2
Cumulative paid losses and LAE, net of reinsurance	2,776.2
Liabilities for unpaid losses and LAE, net of reinsurance	1,446.8
Prior years	(33.5)	$ (39.8)		$ (81.6)
Involuntary assigned risk business
Claims Development [Line Items]
Prior years	(1.4)	(1.8)
Accident years prior to 2013
Claims Development [Line Items]
Cumulative paid losses and LAE, net of reinsurance	363.8
Accident year 2013
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	436.9	440.9	[1]	446.8	[1]	$ 459.3		$ 464.6		$ 468.9		$ 472.6		$ 478.6		$ 460.6		$ 452.6
IBNR	$ 24.6
Cumulative number of reported claims	28,941
Cumulative paid losses and LAE, net of reinsurance	$ 395.5	391.3	[1]	386.6	[1]	379.3		365.9		346.1		317.4		263.8		184.4		$ 68.5
Accident Year 2014
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	402.1	406	[1]	415.5	[1]	424.7		430.5		434.6		432.9		445.8		463.4
IBNR	$ 28.6
Cumulative number of reported claims	28,598
Cumulative paid losses and LAE, net of reinsurance	$ 361.6	357.7	[1]	351.4	[1]	342.1		323.4		297.2		248.9		172.7		$ 65.3
Accident Year 2015
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	381.9	384.9	[1]	396.7	[1]	408.7		419.6		423.9		425.8		422.2
IBNR	$ 28.5
Cumulative number of reported claims	27,273
Cumulative paid losses and LAE, net of reinsurance	$ 333.7	329.3	[1]	322.2	[1]	311.2		290.5		246.9		174.5		$ 65.5
Accident year 2016
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	350.4	354.8	[1]	364.6	[1]	375		395.4		414.6		419
IBNR	$ 28.4
Cumulative number of reported claims	25,820
Cumulative paid losses and LAE, net of reinsurance	$ 298.1	290	[1]	278.3	[1]	261.2		227.7		166.8		$ 65.6
Accident year 2017
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	326.9	329.8	[1]	337.9	[1]	358.3		391.3		412.4
IBNR	$ 35.8
Cumulative number of reported claims	25,121
Cumulative paid losses and LAE, net of reinsurance	$ 269.5	260	[1]	243.7	[1]	215.7		160.2		$ 63.5
Accident Year 2018
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	400.5	400.6	[1]	407.7	[1]	424.6		422.5
IBNR	$ 35.4
Cumulative number of reported claims	28,008
Cumulative paid losses and LAE, net of reinsurance	$ 315.2	293.6	[1]	254.2	[1]	189.9		$ 77.9
Accident Year 2019
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	448.8	448.5	[1]	435.7	[1]	422.4
IBNR	$ 62.6
Cumulative number of reported claims	32,989
Cumulative paid losses and LAE, net of reinsurance	$ 325.8	285.2	[1]	212.6	[1]	$ 88.8
Prior years		10		13.3
Accident Year 2020
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	373.3	374	[1]	365.7	[1]
IBNR	$ 66.9
Cumulative number of reported claims	24,195
Cumulative paid losses and LAE, net of reinsurance	$ 233.5	175.6	[1]	$ 71.9	[1]
Prior years		8
Short-Duration Insurance Contract, Accident Year 2021
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	339	339.2	[1]
IBNR	$ 72.2
Cumulative number of reported claims	22,624
Cumulative paid losses and LAE, net of reinsurance	$ 166.8	$ 66.1	[1]
Short-Duration Insurance Contract, Accident Year 2022
Claims Development [Line Items]
Incurred losses and LAE, net of reinsurance	399.3
IBNR	$ 190.7
Cumulative number of reported claims	20,202
Cumulative paid losses and LAE, net of reinsurance	$ 76.5
[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, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for unpaid losses and LAE, net of reinsurance	$ 1,446.8
Reinsurance recoverable on unpaid losses	445.4	$ 476.9	$ 497	$ 532.5
Unallocated LAE	68.5
Unpaid losses and loss adjustment expenses	$ 1,960.7	$ 1,981.2	$ 2,069.4	$ 2,192.8

Liability for Unpaid Losses a_6

Liability for Unpaid Losses and Loss Adjustment Expenses Short Duration Insurance Contracts, Historcial Claims Duration (Details)	Dec. 31, 2022
Average annual percentage payout of incurred claims by age, net of reinsurance
Year one	18.40%
Year two	28.10%
Year three	17.30%
Year four	10.40%
Year five	5.60%
Year six	3.70%
Year seven	2.40%
Year eight	1.50%
Year nine	1%
Year ten	1%

Reinsurance Reinsurance Premium

Reinsurance Reinsurance Premium Note (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Premiums Written, Net
Direct premiums, written	$ 705.3	$ 582.6	$ 570.8
Assumed premiums written	8.9	7.1	9.3
Gross premiums written	714.2	589.7	580.1
Ceded premiums written	(7)	(6.6)	(5.2)
Premiums written, net	707.2	583.1	574.9
Premiums Earned, Net
Direct premiums earned	673.2	574	611
Assumed premiums earned	9	7	9.5
Gross premiums, earned	682.2	581	620.5
Ceded premiums earned	(7)	(6.6)	(5.2)
Premiums earned, net	675.2	574.4	615.3
Ceded losses and LAE incurred	$ 3.5	$ 16.8	$ 5.9

Reinsurance Excess of Loss (Det

Reinsurance Excess of Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 01, 2023	Jun. 30, 2021	Jun. 30, 2020
Effects of Reinsurance [Line Items]
Reinsurance, Excess Retention, Amount Reinsured, Per Policy		$ 190	$ 190
Reinsurance, Amount Retained, Per Policy		$ 10	$ 10
Forecast [Member]
Effects of Reinsurance [Line Items]
Maximum reinsurance for losses from single occurence or event	$ 200
Reinsurance, Amount Retained, Per Policy	$ 10

Reinsurance LPT Agreement (Deta

Reinsurance LPT Agreement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reinsurance Agreement [Line Items]
Unpaid losses	$ 444.5	$ 476.3
Recoverables was related to the LPT agreement	$ 308.6	328.7
Reinsurance quota share, percentage	100%
Ceded premiums written	$ 7	6.6	$ 5.2
Coverage provided under LPT agreement	2,000
Paid losses and LAE claims related to LPT	858.9
Amortization of deferred gain	8.3	8.4	10.5
Unpaid losses and loss adjustment expenses	1,960.7	1,981.2	2,069.4	$ 2,192.8
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 Due to Estimated Reserves Ceded Under the LPT Agreement [Member]
Reinsurance Agreement [Line Items]
Amortization of deferred gain		2.6	1.2
Unpaid losses and loss adjustment expenses		(4.9)	(4.2)
Change to Contingent Profit Commission [Member]
Reinsurance Agreement [Line Items]
Amortization of deferred gain		$ 0.5	$ 0.2

FHLB Advances (Details)

FHLB Advances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	May 11, 2020
Payables and Accruals [Abstract]
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	$ 10
FHLB advances	182.5	$ 0		$ 35
Repayments of Notes Payable	$ 0	20	$ 15
Letter of credit, unused capacity, commitment fee percentage	15%
Interest Expense, Loans from Other Federal Home Loan Banks	$ 3	$ 2.3
Federal Home Loan Bank, Advances, Weighted Average Interest Rate	2.65%

Credit Facility (Details)

Credit Facility (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	May 11, 2020
Letters of Credit [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 75,000,000
Line of Credit Facility, Commitment Fee Percentage	0.30%
Line of Credit Facility, Commitment Fee Amount	$ 25,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 700,000
Debt Instrument, Covenant Description	50% of the Company’s aggregate net income thereafter
Line of Credit Facility, Covenant Terms	a debt to total capitalization ratio of no more than 35%
FHLB advances	$ 182,500,000	$ 0		$ 35,000,000
Line of Credit Facility, Periodic Payment, Interest	300,000
Proceeds from Lines of Credit	10,000,000	27,000,000	$ 0
Proceeds from (Repayments of) Lines of Credit	10,000,000	$ 27,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	$ 0
Minimum [Member]
Letters of Credit [Line Items]
Line of Credit Facility, Interest Rate at Period End	0.25%
Line of Credit Facility, Commitment Fee Percentage	0.20%
Debt Instrument, Interest Rate, Stated Percentage	1.25%
Debt Instrument, Covenant Description	a minimum consolidated net worth of no less than 70% of the Company’s stockholders’ equity as of September 30, 2020
Maximum [Member]
Letters of Credit [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 125,000,000
Line of Credit Facility, Interest Rate at Period End	1.25%
Line of Credit Facility, Commitment Fee Percentage	0.50%
Line of Credit Facility, Commitment Fee Amount	$ 225,000
Debt Instrument, Interest Rate, Stated Percentage	2.25%

Notes Payable Principal payment

Notes Payable Principal payment obligations on notes payable outstanding (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Capitalization, Long-term Debt [Line Items]
Repayments of Notes Payable			$ 0	$ 20	$ 15
Federal Home Loan Bank [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Repayments of Notes Payable	$ 15	$ 5			$ 15

Letters of Credit (Details)

Letters of Credit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Letters of Credit [Line Items]
Letter of credit, unused capacity, commitment fee percentage	15%
Investments	$ 2,568.8	$ 2,736
Federal Home Loan Bank [Member]
Letters of Credit [Line Items]
Letter of credit, expiration date	Mar. 31, 2023
Letter of credit, unused capacity, commitment fee percentage	15%
Letter of credit, maximum borrowing capacity	$ 70
Letter of credit collateral amount	321.2	$ 261
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	$ 10

Commitments and Contingencies O

Commitments and Contingencies Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	4 years 4 months 24 days
Operating Lease, Expense	$ 3.4	$ 4.1
Finance Lease Expense	0.2	0.2
Lease, Cost	$ 3.6	4.3
Finance Lease, Weighted Average Remaining Lease Term	2 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	2.20%
Finance Lease, Weighted Average Discount Rate, Percent	7.30%
Operating lease right-of-use assets	$ 11.5	14.2
Operating lease liability	13.6	16.6
Property and equipment, gross	0.8	0.8
Accumulated depreciation, depletion and amortization, property and equipment	0.4	0.3
Property and equipment, net	0.4	0.5
Other liabilities	0.4	0.5
Asset impairment charges	$ 0	$ 1	$ 0.8
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	10 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, 2022	Dec. 31, 2021
Operating Leases, Future Minimum Payments Due [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 3.3
Lessee, Operating Lease, Liability, to be Paid, Year Two	3.2
Lessee, Operating Lease, Liability, to be Paid, Year Three	3.1
Lessee, Operating Lease, Liability, to be Paid, Year Four	2.8
Lessee, Operating Lease, Liability, to be Paid, Year Five	1.7
Lessee, Operating Lease, Liability, to be Paid, after Year Five	0.2
Lessee, Operating Lease, Liability, to be Paid	14.3
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(0.7)
Operating lease liability	13.6	$ 16.6
Finance Lease, Liability, Payment, Due [Abstract]
Finance Lease, Liability, to be Paid, Year One	0.2
Finance Lease, Liability, to be Paid, Year Two	0.1
Finance Lease, Liability, to be Paid, Year Three	0.1
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, Payment, Due	0.4
Finance Lease, Liability, Undiscounted Excess Amount	0
Other liabilities	$ 0.4	$ 0.5

Commitments and Contingencies L

Commitments and Contingencies Leases, Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating Lease, Payments	$ 3.4	$ 4.1
Finance Lease, Interest Payment on Liability	$ 0.2	$ 0.1

Commitments and Contingencies C

Commitments and Contingencies Contingencies Surrounding Insurance Assessments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Amount of Insurance-related assessment liability	$ 11.1	$ 10.1
Payment period for assessment liability based on individual states regulations	one year
Other assets, prepaid policy surcharges	$ 15.6	$ 19.9
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, 2022	Dec. 31, 2021
Capital Commitment [Abstract]
Unfunded commitment, private investment fund	$ 55.2	$ 46.4

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended	192 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Feb. 21, 2018
Accelerated Share Repurchases [Line Items]
Accelerated share repurchases, final price paid per share	$ 39.88	$ 20.44
Stock Repurchase Program, Authorized Amount			$ 50
Stock repurchased during period, shares	1,317,649	30,715,539
Stock Repurchased During Period, Value	$ 52.6

Stock-Based Compensation Expens

Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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	$ 4.9	$ 9.1	$ 9.4
Less: related tax benefit	1	1.8	2
Net stock-based compensation expense	$ 3.9	7.3	7.4
% of Shares Subject to Forfeiture	0%
Maximum Percentage of Shares Subject to Forfeiture	15%
Stock Option [Member]
Stock-based compensation expense [Abstract]
Stock-based compensation expense	$ 0	0	0
Restricted stock units (RSUs)
Stock-based compensation expense [Abstract]
Stock-based compensation expense	2.6	3.4	3
Performance shares units [Member]
Stock-based compensation expense [Abstract]
Stock-based compensation expense	$ 2.3	$ 5.7	$ 6.4

Stock-Based Compensation Fair M

Stock-Based Compensation Fair Market Value of Stock Options Granted, Calculated (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share awards, expected target	26%	140%	179%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding options or share units	23,500	65,165	113,216	154,016
Number of options or share units, granted	0	0	0
Stock-options exercised, shares	(41,665)	(48,051)	(40,800)
Number of exercisable options or share units	23,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 27.72
Weighted average exercise price, outstanding	27.72	$ 25.96	$ 24.21	$ 23.65
Weighted average exercise price, exercises	$ 24.97	$ 21.84	$ 22.08
Weighted average remaining contractual life	2 months 12 days	8 months 12 days	1 year 2 months 12 days	1 year 8 months 12 days
Options exercised, intrinsic value	$ 0.7	$ 0.6	$ 0.8
Options vested, fair value	0	0	0.1
Options exercisable, intrinsic value	0.4	1	0.9
Options outstanding, intrinsic value	$ 0.4	$ 1	$ 0.9
Stock Options Exercisable [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contractual life	2 months 12 days
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding options or share units	257,313	198,126	244,344	241,905
Number of options or share units, granted	124,042	86,020	100,491
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 39.90	$ 38.29	$ 36.01
Number of options or share units, forfeited	(13,728)	(35,730)	(7,710)
Number of vested options or share units	(51,127)	(96,508)	(90,342)
Weighted average exercise price, forfeitures	$ 38.45	$ 38.78	$ 38.94
Weighted average grant date fair value	36.28	34.53	35.08	$ 32.45
Weighted average exercise price, vested	$ 37.69	$ 37.71	$ 34.76
Share-based compensation expense, deferred	$ 5.6
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
Options vested, fair value	$ 1.9	$ 3.6	$ 3.1
Options exercisable, intrinsic value	2.1	3.8	3
Options outstanding, intrinsic value	$ 11.1	$ 8.2	$ 7.9
Restricted Stock Units Vested but Unsettled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding options or share units	74,889
Weighted average grant date fair value	$ 29.24

Stock-Based Compensation Perfor

Stock-Based Compensation Performance Share Awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share awards, minimum payout	0%
Performane share awards, maximum payout	250%
Performance share awards, expected target	26%	140%	179%
Performance shares units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding options or share units		980	105,180	[1]
Share-based compensation options, exercise price on grant date		$ 43.29	$ 37.81	[1]
Fair value of awards awarded on grant date		$ 0	$ 4	[1]
Share-based compensation expense, deferred	$ 1.9
Share-based compensation expense, Period for Recognition	24 months
Officer [Member] | Performance shares units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding options or share units	73,120	77,320
Share-based compensation options, exercise price on grant date	$ 40.54	$ 37.54
Fair value of awards awarded on grant date	$ 3	$ 2.9
Management | Performance shares units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding options or share units		779
Share-based compensation options, exercise price on grant date		$ 41.72
Fair value of awards awarded on grant date		$ 0
[1]The PSUs awarded in March 2020, 2021 and 2022, April 2021 and August 2021 were awarded and have a performance period of two years followed by an additional one year vesting period. The 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 Statutory Mat

Statutory Matters Statutory Matters (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 10, 2023	Jul. 02, 2023	Mar. 24, 2023	Feb. 15, 2023
Statutory Accounting Practices [Line Items]
Capital stock and unassigned surplus	$ 696.7	$ 726
Paid in capital	243.2	363.2
Total statutory surplus	939.9	1,089.2
SAP, net income amount	105.1	94.9	$ 140.4
Total stockholders’ equity	944.2	$ 1,213.1
EICN
Statutory Accounting Practices [Line Items]
Capital stock and unassigned surplus	$ 233.7
Extraordinary dividends, approves or does not disapprove the payment within	30 days
Percentage of surplus of EICN's statutory surplus as regards to policyholders	10%
Dividends paid, without approval of regulatory agency	$ 9.7
EICN | Forecast [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval						$ 9.8
ECIC
Statutory Accounting Practices [Line Items]
Percentage of surplus of EICN's statutory surplus as regards to policyholders	10%
Percentage of Net Income	100%
Dividends paid, without approval of regulatory agency	$ 120
ECIC | Forecast [Member]
Statutory Accounting Practices [Line Items]
Maximum dividends that may be paid without prior approval							$ 21
EPIC
Statutory Accounting Practices [Line Items]
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%
Dividends paid, without approval of regulatory agency	$ 24
EPIC | Forecast [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval						$ 22.9
EAC
Statutory Accounting Practices [Line Items]
Dividends paid, without approval of regulatory agency	23.2
EAC | Forecast [Member]
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval					$ 21
EAC and EPIC
Statutory Accounting Practices [Line Items]
Total statutory surplus	$ 4
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 surplus of EICN's statutory surplus as regards to policyholders	10%
Dividends paid, without approval of regulatory agency	$ 2.7
net investment income, Percentage Of	100%
CIC | Forecast [Member]
Statutory Accounting Practices [Line Items]
Maximum dividends that may be paid without prior approval				$ 4

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income, Net (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax	$ (175.8)	$ 76.7
Deferred tax expense	36.9	(16.1)
Total accumulated other comprehensive income, net	$ (138.9)	$ 60.6

Employee Benefit and Retireme_2

Employee Benefit and Retirement Plans Employee Benefit and Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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	$ 2.1	$ 2.3

Earnings Per Share Earnings Per

Earnings Per Share Earnings Per Share (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income	$ 48.4	$ 119.3	$ 119.8
Weighted average number of shares outstanding - basic	27,503,941	28,289,118	29,912,063
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	177,047	311,875	292,801
Weighted average number of shares outstanding - diluted	27,680,988	28,600,993	30,204,864
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	111,386
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	11,256	27,033	36,568
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	131,465	237,999	230,831
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	34,326	46,843	25,402

Segments Segment Net Income Bef

Segments Segment Net Income Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross premiums written	$ 714.2	$ 589.7	$ 580.1
Premiums Written, Net	707.2	583.1	574.9
Net premiums earned	675.2	574.4	615.3
Net investment income	89.8	72.7	76.3
Net realized and unrealized (losses) gains on investments	(51.8)	54.6	19
Other income	0.3	1.4	0.8
Total revenues	713.5	703.1	711.4
Losses and loss adjustment expenses	391	315.2	302.4
Commission expense	95.9	76.1	78.8
Underwriting and general and administrative expenses	167.3	160.2	181.3
Interest and financing expenses	3.5	0.5	0.4
Other Expenses	0	4.1	0.8
Total expenses	657.7	556.1	563.7
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	55.8	147	147.7
Employers Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross premiums written	707.5	588.2	579.8
Premiums Written, Net	700.5	581.6	574.6
Net premiums earned	672.1	573.7	615.1
Net investment income	82.1	69.3	72.1
Net realized and unrealized (losses) gains on investments	(44)	54.5	20.9
Other income	0.3	1.4	0.8
Total revenues	710.5	698.9	708.9
Losses and loss adjustment expenses	397.5	326.2	314.2
Commission expense	95.8	76.1	78.8
Underwriting and general and administrative expenses	138.9	131.2	151.1
Interest and financing expenses	3	0	0.1
Other Expenses		4.1	0.7
Total expenses	635.2	537.6	544.9
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	75.3	161.3	164
Cerity Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross premiums written	6.7	1.5	0.3
Premiums Written, Net	6.7	1.5	0.3
Net premiums earned	3.1	0.7	0.2
Net investment income	4.1	2.8	3.1
Net realized and unrealized (losses) gains on investments	(1.3)	0.3	0
Other income	0	0	0
Total revenues	5.9	3.8	3.3
Losses and loss adjustment expenses	1.8	0.5	0.1
Commission expense	0.1	0	0
Underwriting and general and administrative expenses	13.9	12.9	16.6
Interest and financing expenses	0	0	0
Other Expenses		0	0.1
Total expenses	15.8	13.4	16.8
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(9.9)	(9.6)	(13.5)
Corporate Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross premiums written	0	0	0
Premiums Written, Net	0	0	0
Net premiums earned	0	0	0
Net investment income	3.6	0.6	1.1
Net realized and unrealized (losses) gains on investments	(6.5)	(0.2)	(1.9)
Other income	0	0	0
Total revenues	(2.9)	0.4	(0.8)
Losses and loss adjustment expenses	(8.3)	(11.5)	(11.9)
Commission expense	0	0	0
Underwriting and general and administrative expenses	14.5	16.1	13.6
Interest and financing expenses	0.5	0.5	0.3
Other Expenses		0	0
Total expenses	6.7	5.1	2
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	$ (9.6)	$ (4.7)	$ (2.8)

Segments Geographic Information

Segments Geographic Information (Details) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
CALIFORNIA
Revenue, Major Customer [Line Items]
Premiums In Force	$ 279.7	$ 258.4	$ 262
Policies In force	42,876	40,704	39,610
FLORIDA
Revenue, Major Customer [Line Items]
Premiums In Force	$ 49.4	$ 41.1	$ 37.9
Policies In force	9,417	7,989	6,898
NEW YORK
Revenue, Major Customer [Line Items]
Premiums In Force	$ 27.3	$ 24.5	$ 26.7
Policies In force	7,497	7,307	6,657
All Other States
Revenue, Major Customer [Line Items]
Premiums In Force	$ 266.1	$ 247.4	$ 251.3
Policies In force	61,566	55,350	50,341
UNITED STATES
Revenue, Major Customer [Line Items]
Premiums In Force	$ 622.5	$ 571.4	$ 577.9
Policies In force	121,356	111,350	103,506
Final audit premium	$ 42.5	$ 41.6	$ (2.7)
Total in-force, including final audit premium	$ 665	$ 612.9	$ 575.2
Total in-force policies, includingfinal audit	121,356	111,350	103,506
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, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments
Fixed maturity securities at fair value (amortized cost $7.9 at December 31, 2022 and $9.1 at December 31, 2021)	$ 2,186.3	$ 2,342.7
Short-Term Investments	119.1	10.5
Investments	2,568.8	2,736
Cash and cash equivalents	89.2	75.1
Accrued investment income	19	14.5
Deferred Income Tax Assets, Net	62.7	0
Other assets	41.2	48.7
Total assets	3,716.7	3,783.2
Liabilities and stockholders' equity
Accounts payable and accrued expenses	28.7	24.1
Deferred income taxes, net		7.7
Other liabilities	57.1	57.6
Total liabilities	2,772.5	2,570.1
Stockholders' equity:
Common stock, $0.01 par value; 150,000,000 shares authorized; 57,876,287 and 57,690,254 shares issued and 27,160,748 and 27,741,400 shares outstanding at December 31, 2022 and 2021, respectively	0.6	0.6
Preferred stock, $0.01 par value; 25,000,000 shares authorized; none issued	0	0
Additional paid-in capital	414.6	410.7
Retained earnings	1,295.6	1,338.5
Accumulated other comprehensive (loss) income, net of tax	(138.9)	60.6
Treasury stock, at cost (30,715,539 shares at December 31, 2022 and 29,948,854 shares at December 31, 2021)	(627.7)	(597.3)
Total stockholders’ equity	944.2	1,213.1
Total liabilities and stockholders’ equity	3,716.7	3,783.2
Parent Company [Member]
Investments
Investment in subsidiaries	856.3	1,172.7
Fixed maturity securities at fair value (amortized cost $7.9 at December 31, 2022 and $9.1 at December 31, 2021)	7.9	10.1
Equity securities at fair value (cost $37.5 at December 31, 2022 and $25.2 at December 31, 2021)	33	25
Short-Term Investments	20.7	0
Investments	917.9	1,207.8
Cash and cash equivalents	37.3	4.8	$ 11	$ 9.9
Accrued investment income	0.4	0.2
Federal income taxes receivable	0.1	0.1
Federal income taxes receivable	0	1.5
Deferred Income Tax Assets, Net	2.9	2.1
Other assets	0.7	0.9
Total assets	959.3	1,217.4
Liabilities and stockholders' equity
Accounts payable and accrued expenses	6.2	4.3
Intercompany payable	0.6	0
Other liabilities	8.3	0
Total liabilities	15.1	4.3
Stockholders' equity:
Common stock, $0.01 par value; 150,000,000 shares authorized; 57,876,287 and 57,690,254 shares issued and 27,160,748 and 27,741,400 shares outstanding at December 31, 2022 and 2021, respectively	0.6	0.6
Additional paid-in capital	414.6	410.7
Retained earnings	1,295.6	1,338.5
Accumulated other comprehensive (loss) income, net of tax	(138.9)	60.6
Treasury stock, at cost (30,715,539 shares at December 31, 2022 and 29,948,854 shares at December 31, 2021)	(627.7)	(597.3)
Total stockholders’ equity	944.2	1,213.1
Total liabilities and stockholders’ equity	$ 959.3	$ 1,217.4

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, 2022	Dec. 31, 2021
Fixed maturity securities, amortized cost	$ 2,366.7	$ 2,266.3
Equity securities, cost	144.2	212.6
Short-term investments, amortized cost	$ 119.1	$ 10.5
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)	57,876,287	57,690,254
Common stock, shares outstanding (in shares)	27,160,748	27,741,400
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, at cost (in shares)	30,715,539	29,948,854
Parent Company [Member]
Fixed maturity securities, amortized cost	$ 7.9	$ 9.1
Equity securities, cost	37.5	25.2
Short-term investments, amortized cost	20.7	0
Short-term Investments [Member]
Fixed maturity securities, amortized cost	$ 119.1	$ 10.5

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Net investment income	$ 89.8	$ 72.7	$ 76.3
Net realized and unrealized (losses) gains on investments	(51.8)	54.6	19
Total revenues	713.5	703.1	711.4
Expenses
Underwriting and general and administrative expenses	167.3	160.2	181.3
Interest and financing expenses	3.5	0.5	0.4
Total expenses	657.7	556.1	563.7
Income tax expense	7.4	27.7	27.9
Net income	$ 48.4	$ 119.3	$ 119.8
Earnings per common share for the stated periods (Note 17):
Basic	$ 1.76	$ 4.22	$ 4.01
Diluted	$ 1.75	$ 4.17	$ 3.97
Parent Company [Member]
Revenues
Net investment income	$ 3.6	$ 0.6	$ 1.1
Net realized and unrealized (losses) gains on investments	(6.5)	(0.2)	(1.9)
Total revenues	(2.9)	0.4	(0.8)
Expenses
Underwriting and general and administrative expenses	13.5	15	16.8
Interest and financing expenses	0.5	0.5	0.3
Total expenses	14	16.7	17.1
Loss before income taxes and equity in earnings of subsidiaries	(16.9)	(16.3)	(17.9)
Income tax expense	(3.4)	(3.1)	(3.2)
Net loss before equity in earnings of subsidiaries	(13.5)	(13.2)	(14.7)
Equity in earnings of subsidiaries	61.9	132.5	134.5
Net income	$ 48.4	$ 119.3	$ 119.8
Earnings per common share for the stated periods (Note 17):
Basic	$ 1.76	$ 4.22	$ 4.01
Diluted	1.75	4.17	3.97
Cash dividends declared per common share and eligible plan awards	$ 3.28	$ 1	$ 1

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 48.4	$ 119.3	$ 119.8
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Realized gains on investments	51.8	(54.6)	(19)
Stock-based compensation	5.1	9.1	9.7
Net amortization on investments	3	8.5	9.8
Deferred income tax expense	(17.3)	6.7	(0.4)
Change in operating assets and liabilities:
Accounts payable, accrued expenses and other liabilities	7.2	(2.5)	(4)
Federal income taxes	8.8	(7.9)	22
Other	5.2	6.3	(1)
Net cash provided by (used in) operating activities	99.8	10.8	33
Investing activities
Purchases of fixed maturity securities	(611.4)	(516.6)	(645.6)
Purchase of equity securities	(124.9)	(199.5)	(179.5)
Purchases of short-term investments	(132.7)	(12.5)	(135.9)
Proceeds from sale of equity securities	216.3	135.9	243.4
Proceeds from sale of fixed maturity securities	313.8	206.7	349.5
Proceeds from maturities and redemptions of fixed maturity securities	195	373.5	359.2
Net change in unsettled investment purchases and sales	(3.3)	3.4	(3.6)
Net cash (used in) provided by investing activities	(146.1)	(1.7)	84.3
Financing activities
Acquisition of common stock	(30.4)	(42.6)	(99.4)
Cash transactions related to stock-based compensation	(1.2)	(2.7)	(1.8)
Dividends paid to stockholders and eligible plan award holders	(90.3)	(29)	(30.5)
Proceeds from Lines of Credit	10	27	0
Purchase of Notes Payables	(10)	(27)	0
Net cash used in financing activities	60.4	(94.4)	(111.9)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	14.1	(85.3)	5.4
Cash and cash equivalents at the beginning of the period	75.1
Cash and cash equivalents at the end of the period	89.2	75.1
Parent Company [Member]
Operating activities
Net income	48.4	119.3	119.8
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in net income of subsidiaries	(117.6)	40.9	39.9
Realized gains on investments	6.5	0.2	1.9
Stock-based compensation	5.1	9.1	9.7
Net amortization on investments	0.1	0.1	0.1
Deferred income tax expense	(0.5)	(0.2)	0.8
Change in operating assets and liabilities:
Accounts payable, accrued expenses and other liabilities	0.8	0.3	(2.5)
Federal income taxes	9.8	(0.7)	3.5
Other assets	(0.2)	0.4	0.5
Intercompany payable/receivable	0.6	(0.1)	3.5
Other	0.1	0.1	0.3
Net cash provided by (used in) operating activities	188.5	86.6	96.1
Investing activities
Purchases of fixed maturity securities	(14.7)	0	(3.2)
Purchase of equity securities	(40.2)	(35)	(3)
Purchases of short-term investments	(24.7)	0	0
Proceeds from sale of equity securities	25.5	10.3	29
Proceeds from sale of fixed maturity securities	16	0.4	14.9
Proceeds from maturities and redemptions of fixed maturity securities	4	0	3.8
Net change in unsettled investment purchases and sales	0	5.8	(4.4)
Capital Contributions to subsidiary	0	0	(0.4)
Net cash (used in) provided by investing activities	(34.1)	(18.5)	36.7
Financing activities
Acquisition of common stock	(30.4)	(42.6)	(99.4)
Cash transactions related to stock-based compensation	(1.2)	(2.7)	(1.8)
Dividends paid to stockholders and eligible plan award holders	(90.3)	(29)	(30.5)
Proceeds from Lines of Credit	10	27	0
Purchase of Notes Payables	(10)	(27)	0
Net cash used in financing activities	(121.9)	(74.3)	(131.7)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	32.5	(6.2)	1.1
Cash and cash equivalents at the beginning of the period	4.8	11	9.9
Cash and cash equivalents at the end of the period	$ 37.3	$ 4.8	$ 11

Schedule VI. Supplemental Inf_2

Schedule VI. Supplemental Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Unearned premiums	$ 339.5	$ 304.7
Net investment income	89.8	72.7	$ 76.3
Deferred policy acquisition costs	48.3	43.7
Unpaid losses and loss adjustment expenses	1,960.7	1,981.2	2,069.4	$ 2,192.8
Prior years	(33.5)	(39.8)	(81.6)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	388.3	394.8	402.2
Net premiums earned	675.2	574.4	615.3
Current year	432.8	366.5	395.9
Premiums Written, Net	707.2	583.1	574.9
Losses and loss adjustment expenses	391	315.2	302.4
Employers Segment [Member]
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Unearned premiums	335.1	303.9	298.9
Net investment income	82.1	69.3	72.1
Deferred policy acquisition cost, amortization expense	106.4	92.2	97.5
Deferred policy acquisition costs	48.1	43.7	43.2
Unpaid losses and loss adjustment expenses	1,918.5	1,938	2,024.5
Prior years	(33.4)	(39.8)	(81.6)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	387.8	394.8	402.2
Net premiums earned	672.1	573.7	615.1
Current year	430.9	366	395.8
Premiums Written, Net	700.5	581.6	574.6
Losses and loss adjustment expenses	397.5	326.2	314.2
Cerity Segment [Member]
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Unearned premiums	4.4	0.8	0.2
Net investment income	4.1	2.8	3.1
Deferred policy acquisition cost, amortization expense	0	0	0
Deferred policy acquisition costs	0.2	0	0
Unpaid losses and loss adjustment expenses	1.9	0.6	0.1
Prior years	(0.1)	0	0
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	0.5	0	0
Net premiums earned	3.1	0.7	0.2
Current year	1.9	0.5	0.1
Premiums Written, Net	6.7	1.5	0.3
Losses and loss adjustment expenses	1.8	0.5	0.1
Corporate Segment [Member]
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Unearned premiums	0	0	0
Net investment income	3.6	0.6	1.1
Deferred policy acquisition cost, amortization expense	0	0	0
Deferred policy acquisition costs	0	0	0
Unpaid losses and loss adjustment expenses	40.2	42.6	44.8
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	(8.3)	(11.5)	(11.9)
Net premiums earned	0	0	0
Current year	0	0	0
Premiums Written, Net	0	0	0
Losses and loss adjustment expenses	$ (8.3)	$ (11.5)	$ (11.9)