Old Republic International (ORI) 10-K 28 Feb 24 2023 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity Registrant Name	OLD REPUBLIC INTERNATIONAL CORPORATION
Entity Central Index Key	0000074260
Entity File Number	001-10607
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-2678171
Entity Address, Address Line One	307 North Michigan Avenue
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60601
City Area Code	312
Local Phone Number	346-8100
Title of 12(b) Security	Common Stock / $1 par value
Trading Symbol	ORI
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Financial Statement Error Correction [Flag]	false
Entity Public Float			$ 6,555,078,398
Entity Common Stock, Shares Outstanding		278,183,589
Documents Incorporated by Reference	The following documents are incorporated by reference into that part of this Form 10-K designated to the right of the document title. Title Part Proxy Statement for the 2024 Annual Meeting of Shareholders III, Items 10, 11, 12, 13 and 14
ICFR Auditor Attestation Flag	true

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Name	KPMG LLP
Auditor Location	Chicago, Illinois
Auditor Firm ID	185

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Investments:
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)	$ 12,139.9	$ 11,746.7
Short-term investments (at fair value which approximates cost)	1,032.6	860.8
Equity securities (at fair value) (cost: $1,511.9 and $1,948.1)	2,660.8	3,220.9
Other investments	34.3	31.2
Total investments	15,867.7	15,859.9
Cash	202.8	81
Accrued investment income	117	106.7
Accounts and notes receivable	2,201.4	1,927.5
Federal income tax recoverable: Current	21.8	15.7
Reinsurance balances and funds held	544.7	323
Reinsurance recoverable: Paid losses	175.4	119.4
Reinsurance recoverable for loss and loss adjustment expense reserves	4,977.7	4,699.5
Unearned premium and policy reserves	798.2	768.9
Deferred policy acquisition costs	417.8	382.5
Disposal Group, Including Discontinued Operation, Assets	194.8	0
Other assets	981.5	874.8
Total assets	26,501.4	25,159.4
Liabilities:
Loss and loss adjustment expense reserves	12,538.2	12,221.5
Unearned premiums	3,042.7	2,787.8
Other policyholders' benefits and funds held	150.3	182.2
Total policy liabilities	15,731.4	15,191.6
Commissions, expenses, fees, and taxes	533.8	514.8
Reinsurance balances and funds held	1,380.9	1,079.4
Deferred Tax Liabilities, Net	105.6	42.7
Debt	1,591.2	1,597
Disposal Group, Including Discontinued Operation, Liabilities	56.8	0
Other liabilities	690.6	560.5
Total liabilities	20,090.7	18,986.2
Preferred Stock	0	0
Common Shareholders' Equity:
Common stock	278.3	296.9
Additional paid-in capital	678.7	1,141.8
Retained earnings	5,644.3	5,321.8
Accumulated other comprehensive loss	(132.4)	(517.8)
Unallocated 401(k) plan shares (at cost)	(58.2)	(69.5)
Total common shareholders' equity	6,410.7	6,173.2
Total liabilities, preferred stock and common shareholders' equity	$ 26,501.4	$ 25,159.4

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Amortized Cost	$ 12,263
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	75,000,000	75,000,000
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	278,392,263	296,932,316
Common Class B [Member]
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	0	0

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Net premiums earned	$ 6,445.9	$ 7,342.1	$ 7,559.8
Title, escrow, and other fees	261.8	333.2	443.8
Total premiums and fees	6,707.7	7,675.3	8,003.6
Net investment income	578.3	459.5	434.3
Other income	163.1	149.9	145.6
Total operating revenues	7,449.3	8,284.9	8,583.5
Net investment gains (losses):
Consolidated net realized investment gains (losses)	(67)	62.2	6.9
Unrealized from changes in fair value of equity securities	(123.9)	(263.4)	751.1
Total net investment gains (losses)	(190.9)	(201.1)	758
Total revenues	7,258.3	8,083.7	9,341.6
Expenses:
Loss and loss adjustment expenses	2,580	2,427.7	2,398.2
Dividends to policyholders	16.5	12.5	22.7
Underwriting, acquisition, and other expenses	3,843.6	4,719.2	4,942.3
Interest and other charges	70.5	66.7	56.2
Total expenses	6,510.8	7,226.3	7,419.5
Income before income taxes	747.4	857.4	1,922.1
Income Taxes (Credits):
Current	186.2	226	221.7
Deferred	(37.4)	(55.1)	165.9
Total	148.7	170.9	387.7
Net Income	$ 598.6	$ 686.4	$ 1,534.3
Net Income Per Share:
Net income per share: basic (in dollars per share)	$ 2.12	$ 2.28	$ 5.08
Net income per share: diluted (in dollars per share)	$ 2.10	$ 2.26	$ 5.05
Weighted average number of shares outstanding, basic	282,732,526	301,676,941	301,945,319
Weighted Average Number of Shares Outstanding, Diluted	285,471,064	303,296,612	303,667,669

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 598.6	$ 686.4	$ 1,534.3
Unrealized gains (losses) on securities not included in the statements of income:
Unrealized gains (losses) on securities before reclassifications, not included in the statements of income	285.3	(1,145.7)	(362)
Amounts reclassified as realized investment (gains) losses in the statements of income	184.5	312.3	(1.7)
Pretax unrealized gains (losses) on securities not included in the statements of income	469.8	(833.3)	(363.8)
Deferred income taxes (credits)	98.9	(175.9)	(76.8)
Net unrealized gains (losses) on securities not included in the statements of income, net of tax	370.8	(657.3)	(287)
Defined benefit pension plans:
Net pension adjustment before reclassifications	10.7	83.6	94.5
Amounts reclassified as underwriting, acquisition, and other expenses in the statements of income	0.1	3	7.4
Pretax net adjustment related to defined benefit pension plans	10.8	86.6	101.9
Deferred income taxes (credits)	2.2	18.2	21.4
Net adjustment related to defined benefit pension plans, net of tax	8.5	68.4	80.5
Foreign currency translation adjustment and other	6	(6.4)	1.3
Total other comprehensive income (loss)	385.4	(595.3)	(205.1)
Comprehensive Income	$ 984.1	$ 91.1	$ 1,329.2

Consolidated Statements of Pref

Consolidated Statements of Preferred Stock and Common Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Unallocated 401(k) Plan Shares [Member]	Treasury Stock, Common	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings [Member]	[1]	Cumulative Effect, Period of Adoption, Adjustment AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance AOCI Attributable to Parent [Member]	Convertible Preferred Stock [Member] Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, Including Portion Attributable to Noncontrolling Interest					$ 284
Beginning Balance at Dec. 31, 2020		$ 304.1	$ 1,306.9	$ 4,394.8		$ (103.2)	$ 0	$ 2		$ (1.4)	$ 4,396.9	$ 282.6	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend reinvestment plan		0.1	3.5
Stock-based compensation		3.2
Stock-based compensation			56.5
401(k) plan shares released			9.1			20.6
Adjustments to Additional Paid in Capital, Other			0
Net income	$ 1,534.3			1,534.3
Dividends on common shares ($0.98, $1.92, and $2.38 per common share)				(715.1)
Common Stock, Dividends, Per Share, Cash Paid	$ 2.38
Net unrealized gains (losses) on securities not included in the statements of income, net of tax	$ (287)				(287)
Net adjustment related to defined benefit pension plans, net of tax	80.5				80.5
Treasury Stock, Value, Acquired, Cost Method							0
Treasury Stock, Retired, Cost Method, Amount		0	0				0
Ending Balance at Dec. 31, 2021		307.5	1,376.1	5,216.1	77.4	(82.5)	0	0		0	5,216.1	77.4	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment and other	1.3				1.3
Equity, Including Portion Attributable to Noncontrolling Interest					77.4
Dividend reinvestment plan		0.1	2.2
Stock-based compensation		1.9
Stock-based compensation			31.1
401(k) plan shares released			6.1			13
Adjustments to Additional Paid in Capital, Other			(5.1)
Net income	$ 686.4			686.4
Dividends on common shares ($0.98, $1.92, and $2.38 per common share)				(580.7)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.92
Net unrealized gains (losses) on securities not included in the statements of income, net of tax	$ (657.3)				(657.3)
Net adjustment related to defined benefit pension plans, net of tax	68.4				68.4
Treasury Stock, Value, Acquired, Cost Method							(281.2)
Treasury Stock, Retired, Cost Method, Amount		(12.6)	(268.6)				(281.2)
Ending Balance at Dec. 31, 2022	6,173.2	296.9	1,141.8	5,321.8	(517.8)	(69.5)	0	$ 0		$ 0	$ 5,321.8	$ (517.8)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment and other	(6.4)				(6.4)
Equity, Including Portion Attributable to Noncontrolling Interest					(517.8)
Dividend reinvestment plan		0	1.2
Stock-based compensation		2.3
Stock-based compensation			45.5
401(k) plan shares released			4.5			11.2
Adjustments to Additional Paid in Capital, Other			0
Net income	$ 598.6			598.6
Dividends on common shares ($0.98, $1.92, and $2.38 per common share)				(276.2)
Common Stock, Dividends, Per Share, Cash Paid	$ 0.98
Net unrealized gains (losses) on securities not included in the statements of income, net of tax	$ 370.8				370.8
Net adjustment related to defined benefit pension plans, net of tax	8.5				8.5
Treasury Stock, Value, Acquired, Cost Method							(535.3)
Treasury Stock, Retired, Cost Method, Amount		(20.9)	(514.4)				(535.3)
Ending Balance at Dec. 31, 2023	6,410.7	$ 278.3	$ 678.7	$ 5,644.3	(132.4)	$ (58.2)	$ 0						$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment and other	$ 6				$ 6
[1].

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income		$ 598.6	$ 686.4	$ 1,534.3
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred policy acquisition costs		(35.2)	(32)	(22.3)
Accounts and notes receivable		(274.4)	(158.6)	(174.8)
Loss and loss adjustment expense reserves		93.4	221.5	279.8
Unearned premiums and other policyholders' liabilities		194	157.6	103.4
Federal income taxes		(47.1)	(54.7)	151.4
Reinsurance balances and funds held		23.8	147.2	36.9
Realized Investment Gains (Losses)		67	(62.2)	(6.9)
Unrealized from changes in fair value of equity securities		123.9	263.4	(751.1)
Other - net		136.3	1.9	160.9
Total		880.4	1,170.6	1,311.7
Cash flows from investing activities:
Maturities and calls on fixed income securities		1,353.2	1,356.1	1,410.9
Fixed income securities		1,446.5	1,403.3	338
Equity securities		691.5	2,249.4	540.7
Other investments		14.5	11.4	8.3
Purchases of:
Fixed income securities		(2,919.7)	(5,009.5)	(2,330.7)
Equity securities		(91.9)	(58)	(1,032.2)
Other investments		(106.4)	(59.7)	(55.5)
Net decrease (increase) in short-term investments		(362.6)	(295.7)	183.9
Payments for (Proceeds from) Other Investing Activities		0.3	(12.3)	0
Total		25.3	(415)	(936.5)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt		0	0	642.5
Issuance of common shares		31.1	26.6	60
Redemption of debentures and notes		(5.3)	0	(21.7)
Dividends on common shares (including special dividends of $308.4 paid in 2022 and $764.5 in 2021)		(275.5)	(579.7)	(1,019.2)
Treasury stock acquired		(535.3)	(281.2)	0
Other - net		1.8	1.5	2.5
Total		(783.2)	(832.7)	(335.7)
Increase (decrease) in cash		122.5	(77.1)	39.4
Net Cash Provided by (Used in) Discontinued Operations	[1]	(0.8)	0	0
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning of period		81	158.1	118.7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, end of period		202.8	81	158.1
Supplemental cash flow information:
Cash paid (received) during the period for: Interest		66	65.8	53.4
Cash paid (received) during the period for: Income taxes		$ 198.3	$ 226.5	$ 236.5
[1]At December 31, 2023, the Company classified its RFIG Run-off mortgage insurance business as held-for-sale in its consolidated balance sheet. See Note 2 in the Notes to Consolidated Financial Statements for further discussion.

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Statement of Cash Flows [Abstract]
Special dividends paid in 2022	$ 308.4
Special dividends paid in 2021	$ 764.5

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Summary of Significant Accounting Policies The significant accounting policies employed by Old Republic are set forth in the following summary. Accounting Principles - The Company's insurance subsidiaries are managed pursuant to the laws and regulations of the various states in which they operate. As a result, the subsidiaries operate their business in the context of such laws and regulations and maintain their accounts in conformity with accounting practices prescribed or permitted by various states' insurance regulatory authorities. Federal income taxes and dividends to shareholders are based on financial statements and reports complying with such practices. The statutory accounting requirements vary from the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) of accounting principles generally accepted in the United States of America (GAAP) in the following major respects: • the costs of selling insurance policies are charged to operations immediately, while the related premiums are recognized as income over the terms of the policies. Ceding commissions received in excess of such acquisition costs are amortized over the effective period of the premiums ceded under the related reinsurance agreement; • investments in fixed income securities designated as available for sale are generally carried at amortized cost rather than their estimated fair value; • changes in the fair value of equity securities are recorded directly in earned surplus and not through the income statement as required under GAAP unless such securities are determined to be other-than-temporarily impaired for statutory reporting purposes; • certain assets classified as "nonadmitted assets" are excluded from the balance sheet through a direct charge to earned surplus; • changes in deferred income tax assets or liabilities are recorded directly in earned surplus and not through the income statement; • mortgage guaranty contingency reserves intended to provide for future catastrophic losses are established as a liability through a charge to earned surplus whereas GAAP does not allow provisions for future catastrophic losses; • title insurance premium reserves intended to cover losses that will be reported at a future date are based on statutory formulas, and changes therein are charged in the income statement against each year's premiums written; • certain required formula-derived reserves for general insurance in particular are established for loss reserves in excess of amounts considered adequate by the Company as well as for credits taken relative to reinsurance placed with other insurance companies not licensed in the respective states, all of which are charged directly against earned surplus; and • surplus notes are classified as surplus rather than a liability. The Company has made necessary adjustments to the statutory financial statements of its insurance subsidiaries to conform their accounts with GAAP for these Consolidated Financial Statements and Notes. The following table reflects a summary of all such adjustments: Shareholders' Equity Net Income December 31, Years Ended December 31, 2023 2022 2023 2022 2021 Statutory totals of insurance company subsidiaries: General Insurance $ 4,607.8 $ 4,763.4 $ 594.3 $ 549.2 $ 496.8 Title Insurance 673.9 742.7 152.3 224.9 285.7 RFIG Run-off 131.1 141.8 9.8 70.5 27.3 Life and Accident 56.6 57.4 5.2 5.0 3.6 Subtotal 5,469.4 5,705.3 761.6 849.6 813.4 GAAP totals of non-insurance company subsidiaries and consolidation adjustments 1,058.6 1,023.7 (77.2) 11.3 177.0 Unadjusted totals 6,527.9 6,729.0 684.3 860.8 990.4 Adjustments to conform to GAAP statements: Deferred policy acquisition costs 286.7 252.9 34.9 26.3 9.4 Investment adjustments (102.6) (537.6) (109.1) (252.4) 606.6 Nonadmitted assets 207.3 173.9 — — — Deferred income taxes (95.1) 4.0 26.2 35.4 (135.3) Mortgage contingency reserves 38.4 127.7 — — — Title insurance premium reserves 733.7 777.5 (43.7) 42.5 109.4 Loss and loss adjustment expenses (535.8) (548.8) 17.1 (25.2) (48.7) Surplus notes (696.5) (844.5) — — — Other adjustments 46.4 38.9 (11.2) (0.7) 2.4 Total adjustments (117.5) (556.2) (85.7) (174.4) 543.6 Consolidated GAAP totals $ 6,410.7 $ 6,173.2 $ 598.6 $ 686.4 $ 1,534.3 __________ The insurance laws of the respective states in which the Company’s insurance subsidiaries are incorporated prescribe minimum capital and surplus requirements for the lines of business they are licensed to write. For domestic property and casualty and life and accident insurance companies the National Association of Insurance Commissioners also prescribes risk-based capital (RBC) requirements. RBC is a measure of statutory capital in relationship to a formula-driven definition of risk relative to a company’s balance sheet and mix of business. The combined RBC ratio of the primary General Insurance subsidiaries was 609% and 654% of the company action level RBC at December 31, 2023 and 2022, respectively. The minimum capital requirements for the Company’s Title Insurance subsidiaries are established by statute in the respective states of domicile. The minimum regulatory capital requirements are not significant in relationship to the recorded statutory capital of the Company’s Title and Life and Accident insurance subsidiaries. At December 31, 2023 and 2022 each of the Company’s General, Title, RFIG Run-off, and Life and Accident insurance subsidiaries exceeded the minimum statutory capital and surplus requirements. The preparation of financial statements in conformity with either statutory practices or GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Accordingly, actual results could differ from those estimates. Consolidation Practices - The consolidated financial statements include the accounts of the Company and those of all of its majority owned insurance underwriting and service subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. Statement Presentation - Amounts shown in the consolidated financial statements and applicable notes are stated (except as otherwise indicated and as to share data) in millions, which amounts may not add to totals shown due to truncation. Prior period amounts have been reclassified whenever appropriate to conform to the most current presentation. Accounting Standard Adoption - On January 1, 2023, the Company adopted FASB Accounting Standards Update (ASU) No. 2018-12, Financial Services-Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts . The standard requires insurance companies with long-duration contracts to review and update the assumptions used to measure expected cash flows at least annually, with changes flowing through the income statement, update the discount rate assumption at each reporting date, with changes flowing through other comprehensive income, and enhance disclosures related to the liability. The standard most significantly impacts the discount rate used in estimating reserves for the Company’s life insurance business which is in run-off. The guidance was applied using a modified retrospective approach as of January 1, 2021, resulting in changes to other policyholders’ benefits and funds held, and a net of tax opening equity adjustment to retained earnings and accumulated other comprehensive income, neither of which had a material impact on the consolidated financial statements. No other new accounting standards were adopted in 2023 that materially impacted the consolidated financial statements. Accounting Standards Pending Adoption – In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting: Improvements to Reportable Segment Disclosures . This guidance expands the breadth and frequency of segment disclosures, including additional disclosures about significant segment expenses. Among other requirements, the guidance: • Introduces a new requirement to disclose certain significant segment expenses regularly provided to the chief operating decision maker (CODM), • Extends certain annual disclosures to interim periods, • Permits more than one measure of segment profit or loss to be reported under certain conditions, and • Requires disclosure of the title and position of the CODM. The ASU does not change how an entity identifies its operating segments, aggregates those operating segments, or applies the quantitative thresholds to determine its reportable segments. The requirements will be effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company continues to evaluate the requirements of this new guidance. In December 2023, the FASB issued ASU No. 2023-09, Improvements to Income Tax Disclosures which will require further disaggregation of existing disclosures for the effective tax rate reconciliation and income taxes paid. More specifically, the amendments will require entities to disclose: • A tabular effective tax rate reconciliation, broken out into specific categories with certain reconciling items above a 5% threshold further broken out by nature and/or jurisdiction, and • Income taxes paid (net of refunds received), broken out between federal, state and foreign, and net amounts paid to an individual jurisdiction that exceed 5% of the total. The requirements will be effective for fiscal years beginning after December 15, 2024. The Company continues to evaluate the requirements of this new guidance. Investments - The Company classifies its fixed income securities as those it either (1) has the intent and ability to hold until maturity, (2) has available for sale, or (3) has the intention of trading. The Company's fixed income portfolio is classified as available for sale as of December 31, 2023 and 2022. Fixed income securities classified as available for sale are reported at fair value with changes in such values, net of deferred income taxes, reflected directly in shareholders' equity. Equity securities are reported at fair value with changes in such values reflected as unrealized investment gains (losses) in the consolidated statements of income. Fair values are based on quoted market prices or estimates using values obtained from recognized independent pricing services. The status and fair value changes of fixed income investments are reviewed at least once per quarter to assess whether a decline in fair value of an investment below its cost basis is the result of a credit loss. Factors considered in making this assessment include a security's market price history, as well as the issuer's operating results, financial condition and liquidity, its ability to access capital markets and to make scheduled principal or interest payments, credit rating trends, most current audited financial statements, industry and securities markets conditions and analyst expectations. Sudden fair value declines caused by such adverse developments as newly emerged or imminent bankruptcy filings, issuer default on significant obligations, or reports of financial accounting developments that bring into question the validity of the issuer's previously reported earnings or financial condition are recognized as realized losses as soon as credible publicly available information emerges to confirm such developments. Credit losses are recorded through an allowance with the corresponding charge to realized investment gains (losses). If the Company intends to sell or is more likely than not required to sell a security, the asset is written down to fair value directly through realized investment gains (losses). Investment income is reported net of allocated expenses and includes appropriate adjustments for amortization of premium and accretion of discount on fixed income securities acquired at other than par value. Dividends on equity securities are credited to income on the ex-dividend date. At December 31, 2023, the Company and its subsidiaries did not have significant amounts of non-income producing securities. Investment gains and losses, which result from sales or write-downs of securities, are reflected as revenues in the income statement and are determined on the basis of amortized value at date of sale for fixed income securities, and cost in regard to equity securities; such bases apply to the specific securities sold. Revenue Recognition - Pursuant to GAAP applicable to the insurance industry, revenues are recognized as follows: Substantially all General Insurance premiums pertain to annual policies and are reflected in income on a pro-rata basis in association with the related loss and loss adjustment expenses. Earned but unbilled premiums are generally taken into income on the billing date, while adjustments for retrospective premiums, commissions, and similar charges or credits are accrued on the basis of periodic evaluations of current underwriting experience and contractual obligations. Title premium and fee revenues stemming from the Company's direct operations (which include branch offices of its title insurers and wholly-owned agency subsidiaries) represent 21.0% of 2023, 19.5% of 2022, and 22.0% of 2021 consolidated title business revenues. Such premiums are generally recognized as income at the transaction closing date which approximates the policy effective date. Fee income related to escrow and other closing services is recognized when the related services have been performed and completed. The remaining title premium and fee revenues are produced by independent title agents. Rather than making estimates that could be subject to significant variance from actual premium and fee production, the Company recognizes revenues from those sources upon receipt. Such receipts can result in a three to four month lag relative to the effective date of the underlying title policy and are offset concurrently by production expenses and loss reserve provisions. The Company's mortgage guaranty premiums primarily stem from monthly installments paid on long-duration, guaranteed renewable insurance policies. Such premiums are written and earned in the month coverage is effective. With respect to relatively few annual or single premium policies, earned premiums are largely recognized on a pro-rata basis over the terms of the policies. The Company recognized total contract revenue from customers of $215.9, $210.1, and $210.2 during 2023, 2022, and 2021, respectively. Of these amounts, approximately $145.1, $132.8, and $127.0, respectively, were generated from claims handling and related ancillary services (i.e. risk control services) provided to customers within the Company’s General Insurance segment. Claims handling revenues are recognized on a straight-line basis over the contract period (generally one year) which is commensurate with the entity’s efforts relative to claims adjudication. The related ancillary services revenues are recognized as services are provided and invoiced to the customer. Additionally, revenues from contracts with customers generated from the Company’s Title Insurance segment, consisting primarily of software licensing arrangements and electronic recording services, totaled $62.5, $69.2, and $75.6 for the years ended December 31, 2023, 2022, and 2021, respectively. Such revenues are generally recognized at a point in time upon completion and invoicing of the services, or in the case of software maintenance agreements, on a straight-line basis over the life of the contract (generally one year). Deferred Policy Acquisition Costs - Various insurance subsidiaries of the Company defer direct costs related to the successful production of business. Deferred costs consist principally of commissions, premium taxes, and policy issuance expenses. With respect to most coverages, deferred policy acquisition costs are amortized on the same basis as the related premiums are earned. To the extent that future revenues on existing policies are not adequate to cover related costs and expenses, deferred policy acquisition costs are charged to earnings. The Company considers investment income when evaluating the recoverability of deferred policy acquisition costs. Assets Held-for-Sale - The Company classifies a business as held-for-sale when management has approved or received approval to sell the business, the sale is probable to occur during the next 12 months at a price that is reasonable in relation to its current estimated fair value, and certain other specific criteria are met. The business classified as held-for-sale is measured at the lower of the carrying value or estimated fair value, less costs to sell. If the carrying value of the business exceeds its estimated fair value, less costs to sell, a loss is recognized and reported in net investment gains (losses). Assets and liabilities related to the business classified as held-for-sale are separately reported in the Company's consolidated balance sheet in the period in which the business is classified as held-for-sale. See Note 2 for further discussion. Loss and Loss Adjustment Expense Reserves - The establishment of loss reserves by the Company's insurance subsidiaries is a reasonably complex and dynamic process influenced by a large variety of factors. These factors principally include past experience applicable to the anticipated costs of various types of claims, continually evolving and changing legal theories emanating from the judicial system, recurring accounting, statistical, and actuarial studies, the professional experience and expertise of the Company's claim departments' personnel or attorneys and independent claim adjusters, ongoing changes in claim frequency or severity patterns such as those caused by natural disasters, illnesses, accidents, work‑related injuries, and changes in general and industry-specific economic conditions. Consequently, the reserves established are a reflection of: the opinions of a large number of persons; the application and interpretation of historical precedent and trends; expectations as to future developments; and management's judgment in interpreting all such factors. At any point in time, the Company is exposed to the possibility of higher or lower than anticipated loss costs due to all of these factors, and to the evolution, interpretation, and expansion of tort law, as well as the effects of unexpected jury verdicts. All reserves are therefore based on estimates which are periodically reviewed and evaluated in the light of emerging loss experience and changing circumstances. The resulting changes in estimates are recorded in operations of the periods during which they are made. Return and additional premiums and policyholders' dividends, all of which tend to be affected by development of losses in future years, may offset, in whole or in part, favorable or unfavorable loss developments for certain coverages such as workers' compensation, portions of which are written under loss sensitive programs that provide for such adjustments. Management believes that its overall reserving practices have been consistently applied over many years, and that its aggregate net reserves have generally resulted in reasonable approximations of the ultimate net costs of losses incurred. However, no representation is made nor is any guaranty given that ultimate net losses and related costs will not develop in future years to be significantly greater or lower than currently established reserve estimates. General Insurance reserves are established to provide for the ultimate expected cost of settling unpaid losses and claims reported at each balance sheet date. Such reserves are based on continually evolving assessments of the facts available to the Company during the settlement process which may stretch over long periods of time. Losses and claims incurred but not reported (IBNR), as well as expenses required to settle losses and claims, are established on the basis of a large number of formulas that take into account various criteria, including historical cost experience and anticipated costs of servicing reinsured and other risks. As applicable, estimates of possible recoveries from salvage or subrogation opportunities are considered in the establishment of such reserves. Overall loss and loss adjustment expense reserves incorporate amounts covering net estimates of unusual claims such as those emanating from asbestosis and environmental (A&E) exposures. Such reserves can affect claim costs and related loss ratios for such insurance coverages as general liability, commercial auto, workers' compensation, and property. Title Insurance and related escrow services loss and loss adjustment expense reserves are established as point estimates to cover the projected settlement costs of known as well as IBNR losses related to premium and escrow service revenues of each reporting period. Reserves for known claims are based on an assessment of the facts available to the Company during the settlement process. The point estimates covering all loss reserves take into account IBNR claims based on past experience and evaluations of such variables as changes in trends in the types of policies issued, real estate markets and interest rate environments, and levels of loan refinancing, all of which can have a bearing on the emergence, number, and ultimate cost of claims. RFIG Run-off mortgage guaranty insurance reserves for unpaid loss and loss adjustment expenses are recognized only upon an instance of default, defined as an insured mortgage loan for which two or more consecutive monthly payments have been missed. Loss reserves are based on statistical calculations that take into account the number of reported insured mortgage loan defaults as of each balance sheet date, as well as experience-based estimates of loan defaults that have occurred but have not as yet been reported. Further, the loss reserve estimating process takes into account a large number of variables including trends in claim severity, expected cure rates for reported loan delinquencies at various stages of default, the level of coverage rescissions and claims denials due to material misrepresentation in key underwriting information or non-compliance with prescribed underwriting guidelines, and management judgments relative to future employment levels, housing market activity, and mortgage loan interest costs, demand, and extensions. The Company has the legal right to rescind mortgage insurance coverage unilaterally as expressly stated in its policy. Moreover, two federal courts that have considered that policy wording have each affirmed that right. According to the policy, if any of those representations are materially false or misleading with respect to a loan, the Company has the right to cancel or rescind coverage for that loan retroactively to commencement of the coverage. In recent years, the incidence of rescissions has been immaterial. In addition to the above reserve elements, the Company establishes reserves for loss settlement costs that are not directly related to individual claims. Such reserves are based on prior years' cost experience and trends, and are intended to cover the unallocated costs of claim departments' administration of known and IBNR claims. Reinsurance - The cost of reinsurance is recognized over the terms of the reinsurance contracts. Amounts recoverable from reinsurers for loss and loss adjustment expenses are estimated in a manner consistent with the claim liability associated with the reinsured business. The Company evaluates the financial condition of its reinsurers on a regular basis and allowances are established for estimated credit losses. See Note 10 for further discussion. Income Taxes - The Company and most of its subsidiaries file a consolidated tax return and provide for income taxes payable currently. Deferred income taxes included in the accompanying consolidated financial statements will not necessarily become payable or recoverable in the future. The Company uses the asset and liability method of calculating deferred income taxes. This method results in the establishment of deferred tax assets and liabilities, calculated at currently enacted tax rates that are applied to the cumulative temporary differences between the financial statement and tax bases of assets and liabilities. Property and Equipment - Property and equipment is generally depreciated or amortized over the estimated useful lives of the assets (two to 27 years), substantially by the straight-line method. Depreciation and amortization expenses related to property and equipment were $33.0, $28.3, and $27.2 in 2023, 2022, and 2021, respectively. Expenditures for maintenance and repairs are charged to income as incurred, and expenditures for major renewals and additions are capitalized as appropriate. Title Plants and Records - Title plants and records are carried at original cost or appraised value at the date of purchase. Such values represent the cost of producing or acquiring interests in title records and indexes and the appraised value of purchased subsidiaries' title records and indexes at dates of acquisition. The cost of maintaining, updating, and operating title records is charged to income as incurred. Title records and indexes are ordinarily not amortized unless events or circumstances indicate that the carrying amount of the capitalized costs may not be recoverable. Goodwill and Intangible Assets - Goodwill resulting from business combinations is not amortizable against operations but must be tested annually for possible impairment of its continued value. Intangible assets with definitive lives are amortized against future operating results; whereas indefinite-lived intangibles are tested annually for impairment. Annual testing did not result in any impairment charges for the periods presented, and reporting units with goodwill balances had estimated fair values in excess of their carrying values. The Company's consolidated goodwill balance of $178.3 and $178.1 as of December 31, 2023 and 2022, respectively, is included as part of other assets in the consolidated balance sheets. No significant changes to goodwill balances occurred in either period. Employee Benefit Plans - The Company has a closed pension plan (the Plan) for certain employees under which benefits were frozen as of December 31, 2013. The Plan is a defined benefit plan pursuant to which pension payments are based primarily on years of service and employee compensation near retirement. As a result, eligible employees retain all of the vested rights as of the effective date of the freeze. While additional benefits no longer accrue, the Company's cumulative obligation continues to be subject to further adjustment due to changes in actuarial assumptions such as expected mortality, and changes in interest rates. The funded status of a pension plan is measured as of December 31 of each year as the difference between the fair value of plan assets and the projected benefit obligation. The funded status of the Plan is recognized as a net pension asset or liability, as applicable, with offsetting entries reflected as a component of shareholders' equity in accumulated other comprehensive income, net of deferred taxes. The Company also provides long-term incentive awards to certain employees under the 2022 Incentive Compensation Plan which was approved in May 2022. Stock options granted under this plan are valued using the Black-Scholes-Merton option pricing model and restricted stock awards are valued based on the closing market price at the grant date. The awards are generally expensed on a straight-line basis over the vesting period. Escrow Funds - Segregated cash deposit accounts and the offsetting liabilities for escrow deposits in connection with Title Insurance real estate transactions in the same amounts ($1,817.1 and $2,022.7 at December 31, 2023 and 2022, respectively) are not included as assets or liabilities in the accompanying consolidated balance sheets as the escrow funds are not available for regular operations.

Discontinued Operations and Dis

Discontinued Operations and Disposal Groups	12 Months Ended
	Dec. 31, 2023
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure	Disposition of RMIC Companies, Inc. (RMICC) On November 11, 2023, a definitive agreement was reached to sell RMIC Companies, Inc. and its wholly-owned mortgage insurance subsidiaries (collectively, "RMICC") to Arch U.S. MI Holdings Inc., a subsidiary of Arch Capital Group Ltd., for approximately $140.0. In connection with the pending sale, an expected loss of $ 45.6 As of December 31, 2023, the pending disposition met the criteria for held-for-sale accounting, but did not meet the criteria to be classified as a discontinued operation as it did not represent a strategic shift that has, or will have, a major effect on the Company's operations and financial results. As a result, the related assets and liabilities are included in the separate held-for-sale line items of the asset and liability sections of the consolidated balance sheet, and the results are reported in continuing operations on the consolidated statement of income. See Note 1 for information on accounting for held-for-sale classification. The table below reflects the carrying amounts of assets and liabilities held-for-sale related to the pending disposition described above: December 31, 2023 Assets: Investments: Fixed income securities (at fair value) $ 29.8 Short-term investments (at fair value which approximates cost) 191.3 Total investments 221.2 Cash 0.8 Accrued investment income 0.9 Accounts and notes receivable 0.5 Federal income tax recoverable: Current 2.2 Deferred 0.2 Other assets (a) (31.1) Total assets $ 194.8 Liabilities: Policy liabilities: Loss and loss adjustment expense reserves $ 54.9 Unearned premiums 0.1 Total policy liabilities 55.0 Commissions, expenses, fees, and taxes 1.2 Other liabilities 0.5 Total liabilities $ 56.8 _________ (a) Other assets is presented net of a valuation allowance of $34.5 recorded upon remeasurement of the disposal group to fair value.

Investments

Investments	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Investment	Investments The amortized cost and estimated fair values by type and contractual maturity of fixed income securities are shown in the following tables. Expected maturities will differ from contractual maturities because borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Amortized Gross Gross Estimated Fixed Income Securities by Type: December 31, 2023: Government & Agency $ 1,920.3 $ 3.2 $ 64.6 $ 1,858.9 Municipal 774.5 0.2 7.1 767.6 Corporate 9,568.1 135.5 190.3 9,513.3 $ 12,263.0 $ 139.0 $ 262.0 $ 12,139.9 December 31, 2022: Government & Agency $ 2,300.0 $ — $ 114.8 $ 2,185.2 Municipal 896.9 0.1 15.5 881.5 Corporate 9,139.3 20.3 479.6 8,680.0 $ 12,336.3 $ 20.5 $ 610.1 $ 11,746.7 Amortized Estimated Fixed Income Securities Stratified by Contractual Maturity at December 31, 2023: Due in one year or less $ 1,604.0 $ 1,587.7 Due after one year through five years 6,119.3 5,999.4 Due after five years through ten years 4,455.6 4,467.7 Due after ten years 83.9 84.9 $ 12,263.0 $ 12,139.9 Bonds and other investments with a carrying value of $946.0 as of December 31, 2023 were on deposit with governmental authorities by the Company's insurance subsidiaries to comply with state insurance laws. The following table reflects the Company's gross unrealized losses and fair value of fixed income securities, aggregated by category and length of time that individual securities have been in an unrealized loss position. Less than 12 Months 12 Months or Greater Total Fair Unrealized Losses Fair Unrealized Losses Fair Unrealized Losses December 31, 2023: Fixed Income Securities: Government & Agency $ 461.0 $ 2.7 $ 1,179.3 $ 61.8 $ 1,640.4 $ 64.6 Municipal 173.1 0.8 554.7 6.2 727.9 7.1 Corporate 853.3 8.2 4,270.9 182.0 5,124.3 190.3 $ 1,487.6 $ 11.8 $ 6,005.1 $ 250.2 $ 7,492.7 $ 262.0 December 31, 2022: Fixed Income Securities: Government & Agency $ 1,769.6 $ 71.0 $ 403.8 $ 43.8 $ 2,173.4 $ 114.8 Municipal 845.6 13.0 9.8 2.5 855.5 15.5 Corporate 6,796.7 355.0 1,043.7 124.6 7,840.4 479.6 $ 9,412.0 $ 439.1 $ 1,457.4 $ 170.9 $ 10,869.5 $ 610.1 In the above tables the unrealized losses on fixed income securities are deemed to reflect changes in the interest rate environment. As part of its assessment of credit losses, the Company considers whether it intends to sell or is more likely than not required to sell securities, principally in consideration of its asset and liability maturity matching objectives. Net realized investment gains (losses) for 2023 included impairment charges of $6.2 primarily related to the Company's intent to sell and subsequent disposal of fixed income securities to facilitate certain structural changes to a deferred compensation plan, as well as a small credit loss. Net realized investment gains (losses) for the year ended December 31, 2022 included $123.5 of impairment losses on fixed income securities, also related to management's assessment of its intent to sell, primarily driven by tax planning considerations. No such losses were recognized during 2021. The Company's allowance for credit losses was $1.6 as of December 31, 2023. The Company recorded no allowance for credit losses as of December 31, 2022. The following table shows cost and fair value information for equity securities: Equity Securities Cost Gross Gross Estimated December 31, 2023 $ 1,511.9 $ 1,164.7 $ 15.7 $ 2,660.8 December 31, 2022 $ 1,948.1 $ 1,291.5 $ 18.6 $ 3,220.9 During 2023, 2022, and 2021, the Company recognized pretax unrealized investment gains (losses) of $(123.9), $(263.4), and $751.1, respectively, emanating from changes in the fair value of equity securities in the consolidated statements of income. Changes in the fair value of equity securities still held at December 31, 2023, 2022, and 2021 were $28.2, $42.3, and $711.0, respectively, for the years then ended. Fair Value Measurements - Fair value is defined as the estimated price that is likely to be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants (an exit price) at the measurement date. A fair value hierarchy is established that prioritizes the sources (inputs) used to measure fair value into three broad levels: • Level 1 inputs are based on quoted market prices in active markets; • Level 2 observable inputs are based on corroboration with available market data; • Level 3 unobservable inputs are based on uncorroborated market data or a reporting entity's own assumptions. The following is a description of the valuation methodologies and general classification used for financial instruments measured at fair value. The Company uses quoted values and other data provided by a nationally recognized independent pricing source as inputs into its quarterly process for determining fair values of fixed income and equity securities. To validate the techniques or models used by pricing sources, the Company's review process includes, but is not limited to: (i) initial and ongoing evaluation of methodologies used by outside parties to calculate fair value; and (ii) comparisons with other sources including the fair value estimates based on current market quotations, and with independent fair value estimates provided by the independent investment custodian. The independent pricing source obtains market quotations and actual transaction prices for securities that have quoted prices in active markets and uses their own proprietary method for determining the fair value of securities that are not actively traded. In general, these methods involve the use of "matrix pricing" in which the independent pricing source uses observable market inputs including, but not limited to, investment yields, credit risks and spreads, benchmarking of like securities, broker-dealer quotes, reported trades, and sector groupings to determine a reasonable fair value. Level 1 securities include U.S. and Canadian Treasury notes, publicly traded common stocks, mutual funds, and short-term investments in highly liquid money market instruments. Level 2 securities generally include corporate bonds, municipal bonds, and certain U.S. and Canadian government agency securities. Securities classified within Level 3 include non-publicly traded bonds and equity securities. There were no significant changes in the fair value of Level 3 assets as of December 31, 2023 and 2022. The following tables show a summary of the fair value of financial assets segregated among the various input levels described above: Fair Value Measurements As of December 31, 2023: Level 1 Level 2 Level 3 Total Fixed income securities: Government & Agency $ 1,379.8 $ 479.1 $ — $ 1,858.9 Municipal — 767.6 — 767.6 Corporate — 9,493.7 19.5 9,513.3 Short-term investments 1,032.6 — — 1,032.6 Equity securities $ 2,653.8 $ — $ 7.0 $ 2,660.8 As of December 31, 2022: Fixed income securities: Government & Agency $ 1,598.8 $ 586.3 $ — $ 2,185.2 Municipal — 881.5 — 881.5 Corporate — 8,659.2 20.8 8,680.0 Short-term investments 860.8 — — 860.8 Equity securities $ 3,219.1 $ — $ 1.7 $ 3,220.9 There were no transfers between Levels 1, 2 or 3 during 2023 or 2022. The following table reflects the composition of net investment income, net realized gains or losses, and the net change in unrealized investment gains or losses for each of the years shown. Years Ended December 31: 2023 2022 2021 Investment income from: Fixed income securities $ 438.8 $ 314.4 $ 280.6 Equity securities 92.1 132.5 157.5 Short-term investments 50.9 17.9 0.1 Other investments (a) 17.0 4.3 2.1 Gross investment income 598.9 469.3 440.4 Investment expenses (a) 20.6 9.7 6.1 Net investment income $ 578.3 $ 459.5 $ 434.3 Net investment gains (losses): Realized from actual transactions: Fixed income securities: Gains $ 1.2 $ 2.6 $ 3.4 Losses (181.9) (190.2) (1.9) Net (180.7) (187.6) 1.5 Equity securities: Gains 214.5 486.5 68.0 Losses (51.4) (111.9) (62.8) Net 163.0 374.5 5.1 Other investments, net 2.4 (1.2) 0.2 Total realized from actual transactions (15.2) 185.7 6.9 From impairments (b) (51.8) (123.5) — From unrealized changes in fair value of equity securities (123.9) (263.4) 751.1 Total realized and unrealized investment gains (losses) (190.9) (201.1) 758.0 Current and deferred income taxes (credits) (40.0) (42.5) 159.6 Net of tax realized and unrealized investment gains (losses) $ (150.8) $ (158.6) $ 598.4 Changes in unrealized investment gains (losses) reflected directly in shareholders' equity on: Fixed income securities $ 464.1 $ (824.7) $ (361.2) Less: Deferred income taxes (credits) 97.7 (174.1) (76.2) 366.3 (650.5) (284.9) Other investments 5.7 (8.5) (2.5) Less: Deferred income taxes (credits) 1.1 (1.8) (0.5) 4.5 (6.7) (2.0) Net changes in unrealized investment gains (losses), net of tax $ 370.8 $ (657.3) $ (287.0) _________ (a) Includes interest on funds held. (b) Includes expected loss on the pending sale of RMICC. See Note 2 for further discussion.

Deferred Policy Acquisition Cos

Deferred Policy Acquisition Cost	12 Months Ended
	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Policy Acquisition Cost	Deferred Policy Acquisition Costs The following table shows the components of deferred policy acquisition costs: Years Ended December 31: 2023 2022 2021 Deferred, beginning of year $ 382.5 $ 350.4 $ 328.0 Policy acquisition costs deferred: Commissions - net of reinsurance 495.0 423.3 340.9 Premium taxes 161.0 147.1 135.2 Salaries and other underwriting expenses 59.3 53.0 48.3 Subtotal 715.3 623.5 524.6 Amortization charged to income (680.1) (591.4) (502.2) Change for the year 35.2 32.0 22.4 Deferred, end of year $ 417.8 $ 382.5 $ 350.4

Losses, Claims and Settlement E

Losses, Claims and Settlement Expenses	12 Months Ended
	Dec. 31, 2023
Insurance [Abstract]
Losses, Claims and Settlement Expenses	Loss and Loss Adjustment Expenses The following table shows changes in aggregate reserves for the Company's loss and loss adjustment expenses: Years Ended December 31: 2023 2022 2021 Gross reserves at beginning of year $ 12,221.5 $ 11,425.5 $ 10,671.0 Less: reinsurance losses recoverable 4,699.5 4,125.3 3,650.5 Net reserves at beginning of year: General Insurance 6,824.8 6,587.0 6,328.0 Title Insurance 612.8 594.2 556.1 RFIG Run-off 77.9 111.2 127.6 Other 6.3 7.6 8.6 Subtotal 7,521.9 7,300.2 7,020.4 Incurred loss and loss adjustment expenses: Provisions for insured events of the current year: General Insurance 2,770.7 2,545.1 2,418.3 Title Insurance 93.6 139.6 160.6 RFIG Run-off 13.7 17.5 19.3 Other 8.6 8.7 12.0 Subtotal 2,886.8 2,711.1 2,610.4 Change in provision for insured events of prior years: General Insurance (234.0) (193.1) (137.9) Title Insurance (44.9) (50.4) (47.6) RFIG Run-off (24.7) (35.1) (21.1) Other (2.1) (3.9) (3.9) Subtotal (305.8) (282.6) (210.6) Total incurred loss and loss adjustment expenses 2,581.0 2,428.4 2,399.7 Payments: Loss and loss adjustment expenses attributable to insured events of the current year: General Insurance 930.6 834.4 781.5 Title Insurance 14.4 13.1 21.4 RFIG Run-off — 0.2 0.2 Other 4.7 4.8 7.7 Subtotal 949.8 852.7 810.9 Loss and loss adjustment expenses attributable to insured events of prior years: General Insurance 1,475.6 1,279.8 1,239.8 Title Insurance 48.7 57.3 53.4 RFIG Run-off 11.9 15.5 14.3 Other 1.3 1.3 1.3 Subtotal 1,537.7 1,354.0 1,309.0 Total payments 2,487.6 2,206.7 2,120.0 RFIG Run-off reserves reclassified to liabilities held-for-sale (a) 54.9 — — Net reserves at end of year: General Insurance 6,955.2 6,824.8 6,587.0 Title Insurance 598.5 612.8 594.2 RFIG Run-off — 77.9 111.2 Other 6.6 6.3 7.6 Subtotal 7,560.4 7,521.9 7,300.2 Reinsurance losses recoverable 4,977.7 4,699.5 4,125.3 Gross reserves at end of year $ 12,538.2 $ 12,221.5 $ 11,425.5 _________ (a) RFIG Run-off reserves have been reclassified as held-for-sale as of December 31, 2023. See Note 2 for further discussion. For the three most recent calendar years, the above table indicates that the one-year development of consolidated reserves at the beginning of each year produced favorable developments of 4.1%, 3.9%, and 3.0% for 2023, 2022, and 2021, respectively, with average favorable annual developments of 3.6%. The Company believes that the factors most responsible, in varying and continually changing degrees, for favorable or unfavorable reserve developments include, as to many General Insurance coverages, the effect of reserve discounts applicable to workers' compensation claims, changes in severity of litigated claims in particular, governmental or judicially imposed retroactive conditions in the settlement of claims such as noted below in regard to black lung disease claims, changes in inflation rates applicable to repairs and the medical portion of claims in particular, and changes in claims incurred but not reported due to the slower and highly volatile emergence patterns applicable to certain types of claims such as those stemming from litigated, assumed reinsurance, or the A&E types of claims noted below. In 2023, the favorable development experienced by General Insurance came predominantly from the 2010-2022 accident years, driven by workers’ compensation and to a lesser extent, commercial auto lines of coverage, partially offset by unfavorable development from the general liability line of coverage. Favorable development experienced by Title Insurance occurred largely within the 2018-2020 years while RFIG Run-off segment was driven by higher levels of cure rates on reported defaults. Federal Black Lung Regulations The Federal Department of Labor revised the Federal Black Lung Program regulations in both 2001 and 2010. The revisions reflect more lenient standards that can potentially benefit claimants. Claims filed or refiled pursuant to these revised regulations initially increased immediately following the passing of both sets of regulations but have been gradually decreasing since. The majority of pending claims against Old Republic pertain to business underwritten through loss sensitive programs that permit the charge of additional or refund of return premiums to wholly or partially offset changes in estimated claim costs, or to business underwritten as a service carrier on behalf of various industry-wide involuntary market (i.e. assigned risk) pools. A smaller portion pertains to business produced on a traditional risk transfer basis. The Company has established applicable reserves for claims as they have been reported and for claims not as yet reported on the basis of its historical experience. A&E Reserves At December 31, 2023 and 2022, Old Republic's aggregate loss and loss adjustment expense reserves specifically identified with A&E exposures amounted to approximately $130.6 and $121.3 gross, respectively, and $87.5 and $84.0 net of reinsurance, respectively. Old Republic's reserve estimates also include provisions for indemnity and settlement costs for various A&E claims that have been filed in the normal course of business against a number of its insurance subsidiaries. Many such claims relate to policies incepting prior to 1985, including many issued during a short period between 1981 and 1982 pursuant to an agency agreement canceled in 1982. Over the years, the Company's property and liability insurance subsidiaries have typically issued general liability insurance policies with face amounts ranging between $1.0 and $2.0 and rarely exceeding $10.0. Such policies have, in turn, been subject to reinsurance cessions which have typically reduced the subsidiaries' net retentions to $0.5 or less as to each claim. Old Republic's exposure to A&E claims cannot, however, be calculated by conventional insurance reserving methods for a variety of reasons, including: a) the absence of statistically valid data inasmuch as such claims generally involve long reporting delays and very often uncertainty as to the number and identity of insureds against whom such claims have arisen or will arise; and b) the litigation history of such or similar claims. Inconsistent court decisions stem from such questions as: when an alleged loss occurred, which policies provide coverage, how a loss is to be allocated among potentially responsible insureds and/or their insurance carriers, how policy coverage exclusions are to be interpreted, what types of environmental impairment or toxic tort claims are covered, when the insurer's duty to defend is triggered, how policy limits are to be calculated, and whether clean-up costs constitute property damage. Over time, the Executive Branch and/or the Congress of the United States have proposed or considered changes in the legislation and rules affecting the determination of liability for A&E claims. As of December 31, 2023, however, there is no solid evidence to suggest that possible future changes might mitigate or reduce some or all of these claim exposures. Because of the above issues and uncertainties, estimation of reserves for losses and allocated loss adjustment expenses for A&E claims in particular is much more difficult to quantify with a high degree of precision. Accordingly, no representation can be made that the Company's reserves for such claims and related costs will not prove to be overstated or understated in the future. Based on average annual claims payments during the five most recent calendar years, such reserves represented a paid loss survival ratio of 6.6 years (gross) and 7.4 years (net of reinsurance) as of December 31, 2023, and 6.4 years (gross) and 7.6 years (net of reinsurance) as of December 31, 2022. Fluctuations in this ratio between years can be caused by the inconsistent pay-out patterns associated with these types of claims. For the five years ended December 31, 2023, incurred A&E claim and related loss settlement costs have averaged 0.6% of average annual General Insurance loss and loss adjustment expenses. The following represents the Company's incurred and paid loss development tables for the major types of insurance coverages as of December 31, 2023. The information about incurred and paid claims development for the years ended December 31, 2014 to 2022 is presented as supplementary information. Workers' Compensation Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted) As of December 31, 2023 Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses Cumulative Number of Reported Losses* For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 780.9 $ 792.8 $ 786.4 $ 784.9 $ 777.0 $ 763.3 $ 724.4 $ 705.4 $ 685.8 $ 673.2 $ 58.8 54,174 2015 794.3 792.6 787.3 785.5 769.1 742.4 695.8 659.8 622.3 69.8 55,234 2016 756.1 752.9 745.7 730.5 712.6 692.8 624.2 584.9 95.5 52,495 2017 727.0 713.9 700.3 683.4 676.3 654.2 609.3 102.6 51,787 2018 698.6 691.5 681.0 665.9 644.8 605.4 141.3 52,390 2019 664.6 657.4 653.2 667.5 658.8 154.0 51,887 2020 560.9 569.4 571.7 574.7 144.7 45,859 2021 500.3 502.4 493.8 153.0 46,975 2022 488.1 487.4 184.7 46,691 2023 491.7 276.1 35,679 Total $ 5,802.1 (A) * Reported losses are accumulated on an individual claimant basis and exclude external reinsurance assumed and participation in residual market pools as claim frequency information is not available. Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 116.9 $ 293.7 $ 397.1 $ 466.0 $ 499.5 $ 524.8 $ 544.9 $ 554.6 $ 561.0 $ 567.9 2015 109.0 274.9 379.3 435.1 466.7 484.7 499.8 507.3 512.7 2016 102.5 253.5 334.4 383.5 408.4 425.2 435.8 442.5 2017 99.6 244.6 334.8 383.1 414.3 444.1 453.5 2018 94.8 240.6 320.5 367.2 396.8 416.0 2019 102.9 239.8 329.6 382.3 412.2 2020 84.3 211.6 284.3 329.7 2021 80.1 187.8 252.9 2022 74.2 188.2 2023 75.5 Total $ 3,651.7 (B) Net incurred loss and allocated loss adjustment expenses (A) $ 5,802.1 Less: net paid loss and allocated loss adjustment expenses (B) 3,651.7 Subtotal 2,150.3 All outstanding liabilities before 2014, net of reinsurance 754.9 Liabilities for loss and allocated loss adjustment expenses, net of reinsurance $ 2,905.3 General Liability Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted) As of December 31, 2023 Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses Cumulative Number of Reported Losses* For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 107.0 $ 110.4 $ 109.4 $ 111.0 $ 117.0 $ 117.1 $ 112.3 $ 112.8 $ 115.6 $ 117.9 $ 10.7 6,047 2015 96.0 96.3 99.2 102.3 104.8 105.8 99.8 99.2 99.0 12.1 5,616 2016 92.4 96.7 98.8 100.3 101.0 104.4 98.8 95.9 13.2 83,293 2017 111.2 121.4 129.6 132.8 135.2 138.0 143.9 18.2 460,523 2018 120.5 119.7 125.1 135.5 141.9 152.0 32.0 462,021 2019 133.5 131.9 138.7 146.0 146.9 39.5 375,990 2020 112.4 111.7 114.9 116.1 50.0 6,112 2021 94.2 92.7 99.0 44.3 6,022 2022 97.8 100.7 49.4 5,758 2023 132.6 98.5 12,208 $ 1,204.4 (A) * Reported losses are accumulated on an individual claimant basis and exclude external reinsurance assumed and participation in residual market pools as loss frequency information is not available. The increases beginning in 2016 are due to the addition of a national account with higher frequency yet lower severity than the existing book of business for accident years 2016 through 2019. Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 5.8 $ 15.8 $ 32.0 $ 52.8 $ 73.5 $ 82.8 $ 88.9 $ 94.9 $ 98.9 $ 103.0 2015 6.3 16.0 29.5 47.4 64.5 70.7 75.0 79.9 82.5 2016 7.1 18.5 34.8 47.7 58.0 66.9 71.9 75.1 2017 5.7 25.9 50.1 76.9 95.5 105.3 113.2 2018 6.9 28.8 48.9 71.0 91.0 102.0 2019 6.4 29.5 53.4 72.1 87.8 2020 4.2 12.4 28.5 45.0 2021 5.6 14.7 30.9 2022 6.4 22.2 2023 3.9 $ 665.9 (B) Net incurred loss and allocated loss adjustment expenses (A) $ 1,204.4 Less: net paid loss and allocated loss adjustment expenses (B) 665.9 Subtotal 538.4 All outstanding liabilities before 2014, net of reinsurance 167.0 Liabilities for loss and allocated loss adjustment expenses, net of reinsurance $ 705.5 Commercial Auto Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted) As of December 31, 2023 Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses Cumulative Number of Reported Losses* For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 687.8 $ 689.2 $ 691.7 $ 688.0 $ 688.6 $ 687.8 $ 683.8 $ 683.0 $ 682.1 $ 679.2 $ 5.9 103,242 2015 712.4 710.5 729.7 721.4 720.7 703.4 700.6 699.9 699.5 2.2 104,829 2016 755.9 768.9 786.0 780.8 779.3 762.1 754.9 752.9 4.3 110,766 2017 788.7 819.1 869.2 874.4 867.9 847.1 843.0 6.7 117,639 2018 883.2 947.9 989.9 992.1 976.1 971.3 20.1 129,290 2019 931.1 959.7 954.8 947.4 942.0 25.0 138,735 2020 941.1 913.7 854.0 845.5 70.6 117,927 2021 989.4 954.6 935.3 83.9 125,608 2022 1,074.2 1,044.5 123.6 125,309 2023 1,204.1 100.9 107,783 $ 8,917.7 (A) * Reported losses are accumulated on an individual claimant basis and exclude external reinsurance assumed and participation in residual market pools as claim frequency information is not available. Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 267.4 $ 430.5 $ 536.9 $ 605.4 $ 640.3 $ 664.9 $ 658.4 $ 664.3 $ 669.9 $ 672.2 2015 265.1 438.9 541.8 626.2 669.7 680.6 687.3 693.0 695.4 2016 290.2 469.6 585.1 677.8 710.8 725.5 737.3 742.7 2017 307.9 512.0 657.1 746.5 791.2 814.1 826.9 2018 330.0 557.5 730.4 836.7 900.0 924.1 2019 330.4 549.0 681.6 787.2 875.3 2020 290.1 464.3 602.2 692.7 2021 302.7 508.6 662.9 2022 354.8 606.8 2023 424.4 $ 7,123.8 (B) Net incurred loss and allocated loss adjustment expenses (A) $ 8,917.7 Less: net paid loss and allocated loss adjustment expenses (B) 7,123.8 Subtotal 1,793.9 All outstanding liabilities before 2014, net of reinsurance 14.5 Liabilities for loss and allocated loss adjustment expenses, net of reinsurance $ 1,808.4 The following represents a reconciliation of the incurred and paid loss development tables to total loss and loss adjustment expense reserves as reported in the consolidated balance sheets. December 31, 2023 2022 Net loss and allocated loss adjustment expense reserves: Workers' compensation (a) $ 2,725.3 $ 2,879.6 General liability 705.5 641.9 Commercial auto 1,808.4 1,747.3 Other short-duration insurance coverages 1,412.5 1,260.0 Subtotal 6,651.9 6,529.0 Reinsurance recoverable on loss reserves: Workers' compensation 1,998.2 1,975.5 General liability 813.2 785.3 Commercial auto 1,684.4 1,486.6 Other short-duration insurance coverages 477.7 447.7 Subtotal 4,973.6 4,695.3 Insurance coverages other than short-duration (b) 566.4 656.6 Unallocated loss adjustment expense reserves (c) 346.1 340.5 912.6 997.1 Gross loss and loss adjustment expense reserves $ 12,538.2 $ 12,221.5 __________ (a) Certain long-term disability type workers' compensation reserves are discounted to present value based on interest rates typically ranging from 3.0% to 3.5%. The amount of discount reflected in the year-end net reserves totaled $179.9 and $184.7 as of December 31, 2023 and 2022, respectively. Interest accretion of $25.6, $9.6, and $42.0 for the years ended December 31, 2023, 2022, and 2021, respectively, was recognized as unfavorable development of prior year reserves within loss and loss adjustment expenses in the consolidated statements of income. (b) RFIG Run-off loss reserves of $53.6 have been classified as held-for-sale as of December 31, 2023. See Note 2 for further discussion. (c) RFIG Run-off unallocated loss adjustment expense reserves of $1.2 have been classified as held-for-sale as of December 31, 2023. See Note 2 for further discussion. The table below is supplementary information and presents the historical average annual percentage payout of incurred losses by age, net of reinsurance. Supplementary Information (Unaudited) Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Workers' compensation 16.2 % 23.9 % 14.2 % 8.4 % 4.8 % 3.5 % 2.2 % 1.3 % 0.9 % 1.0 % General liability 5.1 % 11.8 % 15.1 % 15.6 % 13.7 % 7.5 % 5.1 % 4.4 % 3.0 % 3.4 % Commercial auto 35.7 % 23.4 % 16.0 % 11.1 % 6.1 % 2.5 % 0.8 % 0.8 % 0.6 % 0.3 %

Reinsurance and Retention Limit

Reinsurance and Retention Limits	12 Months Ended
	Dec. 31, 2023
Reinsurance and Retention Limits [Abstract]
Reinsurance and Retention Limits [Text Block]	Reinsurance and Retention Limits In order to maintain premium production within its capacity and limit maximum losses for which it might become liable under its policies, Old Republic, as is common practice in the insurance industry, may cede a portion or all of its premiums and related liabilities on certain classes of insurance, individual policies, or blocks of business to other insurers and reinsurers. Although the ceding of insurance does not ordinarily discharge an insurer from its direct liability to a policyholder, it is industry practice to establish the reinsured part of risks as the liability of the reinsurer. Old Republic also employs retrospective premium and a large variety of risk-sharing procedures and arrangements for parts of its business in order to reduce underwriting losses for which it might become liable under insurance policies it issues. To the extent that any reinsurance companies, retrospective related risks, or producers might be unable to meet their obligations under existing reinsurance, retrospective insurance and production agreements, Old Republic would be liable for the defaulted amounts. The Company generally protects itself by withholding funds, securing indemnity agreements, obtaining surety bonds, or otherwise collateralizing such obligations through irrevocable letters of credit, cash, or securities. Except as noted in the following paragraph, reinsurance protection on property and liability coverages generally limits the net loss from any one event to a maximum of: $5.2 for workers' compensation; $7.0 for commercial auto liability; $7.0 for general liability; $12.8 for directors & officers; $2.2 for aviation; and $23.1 for property coverages. Title insurance risk assumptions are generally limited to a maximum of $500.0 as to any one policy. The vast majority of title policies issued, however, carry exposures of less than $1.0. The average direct primary mortgage guaranty exposure is (in whole dollars) $37,000 per insured loan. The Company maintains treaty and facultative reinsurance coverage for its workers' compensation exposures. Pursuant to regulatory requirements, however, all workers' compensation primary insurers such as the Company remain liable for unlimited amounts in excess of reinsured limits. Other than the substantial concentration of workers' compensation losses caused by the September 11, 2001 terrorist attack on America, to the best of the Company's knowledge there had not been a similar accumulation of claims in a single location from a single occurrence prior to that event. Nevertheless, the possibility continues to exist that non-reinsured losses could, depending on a wide range of severity and frequency assumptions, aggregate several hundred million dollars to an insurer such as the Company. Such aggregation of losses could occur in the event of a catastrophe such as an earthquake that could lead to the death or injury of a large number of persons concentrated in a single facility such as a high-rise building. As a result of the September 11, 2001 terrorist attack on America, the reinsurance industry eliminated coverage from substantially all contracts for claims arising from acts of terrorism. Primary insurers like the Company therefore became fully exposed to such claims. The Terrorism Risk Insurance Act (TRIA), the Terrorism Risk Insurance Revision and Extension Act (TRIREA), and the Terrorism Risk Insurance Program Reauthorization Act of 2019 (TRIPRA) were subsequently placed into law and serve as a federal reinsurance program administered by the Secretary of the Treasury. This legislation requires primary insurers to offer coverage for certified acts of terrorism under most commercial property and casualty insurance policies (excluding such coverages as commercial auto, burglary and theft, professional liability, and farm owners multi-peril insurance) and also provides for temporary reinsurance protection through December 31, 2027. Although insurers are permitted to charge an additional premium for terrorism coverage, insureds may reject the coverage. The program's protection is not triggered for losses arising from an act of terrorism until the industry first suffers losses in excess of a prescribed aggregate deductible during any one year. The program deductible trigger was $200.0 for 2023. Once the program trigger is met, the program will be responsible for a fixed percentage of the Company's terrorism losses that exceed its deductible. The Company's deductible amounts to 20% of direct earned premium on eligible property and casualty insurance coverages. The Company currently reinsures limits on a treaty basis of $195.0 in excess of $5.0 for claims arising from certain acts of terrorism for casualty clash and catastrophe workers' compensation liability insurance coverages. The Company also purchases facultative reinsurance on certain accounts in excess of $200.0 to manage the Company's net exposure. Reinsurance ceded by the Company's insurance subsidiaries in the ordinary course of business is typically placed on an excess of loss basis. Under excess of loss reinsurance agreements, the companies are generally reimbursed for losses exceeding contractually agreed‑upon levels. Quota share reinsurance is most often effected between the Company's insurance subsidiaries and industry-wide assigned risk plans or captive insurers owned by insureds. Under quota share reinsurance, the Company remits to the assuming entity an agreed-upon percentage of premiums written and is reimbursed for underwriting expenses and proportionately related claims costs. Reinsurance recoverable asset balances represent amounts due from or credited by assuming reinsurers for paid and unpaid loss and premium reserves. Such reinsurance balances are recoverable from nonadmitted foreign and certain other reinsurers, such as captive insurance companies owned by insureds or business producers, as well as similar balances or credits arising from policies that are retrospectively rated or subject to insureds' high deductible retentions that are substantially collateralized by irrevocable letters of credit, securities, and other financial instruments. Old Republic evaluates on a regular basis the financial condition of its assuming reinsurers and insureds who purchase its retrospectively rated or high deductible policies. Estimates of credit losses are included in the Company's net loss and loss adjustment expense reserves since reinsurance, retrospectively rated, and self-insured deductible policies and contracts do not relieve Old Republic from its direct obligations to insureds or their beneficiaries. See Note 10 for further discussion. At December 31, 2023, the General Insurance segment's ten largest reinsurers represented approximately 59% of the total consolidated reinsurance recoverable on paid and unpaid losses, with Day One Insurance, Inc. the largest reinsurer, representing 13.2% of the total recoverable balance. Of the balances due from these ten reinsurers, 50.8% was recoverable from A or better rated reinsurance companies, 22.4% from domestic unrated companies, and 26.8% from foreign unrated companies. The following information relates to reinsurance and related data for the General Insurance segment for the three years ended December 31, 2023. Reinsurance transactions of the Title Insurance and RFIG Run-off segments and the small life and accident insurance operation are not material. Years Ended December 31: 2023 2022 2021 General Insurance Written premiums: Direct $ 6,776.4 $ 6,263.3 $ 5,691.3 Assumed 96.6 90.0 74.0 Ceded $ 2,516.7 $ 2,375.1 $ 2,084.4 Earned premiums: Direct $ 6,513.2 $ 6,021.0 $ 5,509.1 Assumed 94.7 87.1 73.7 Ceded $ 2,488.6 $ 2,299.5 $ 2,027.3 Losses ceded $ 1,795.9 $ 1,677.3 $ 1,255.6

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for combined current and deferred income taxes (credits) reflected in the consolidated statements of income may not bear the usual relationship to income before income taxes (credits) as the result of permanent and other differences between pretax income or loss and taxable income or loss determined under existing tax regulations. The more significant differences, their effect on the statutory income tax rate (credit), and the resulting effective income tax rates (credits) are summarized below: Years Ended December 31: 2023 2022 2021 Statutory tax rate 21.0 % 21.0 % 21.0 % Tax rate increases (decreases): Tax-exempt interest (0.4) (0.3) (0.2) Dividends received exclusion (1.0) (1.3) (0.7) Meals and entertainment 0.3 0.2 0.1 Other items - net — 0.3 — Effective tax rate 19.9 % 19.9 % 20.2 % The tax effects of temporary differences that give rise to significant portions of the Company's net deferred tax assets (liabilities) are as follows at the dates shown: December 31: 2023 2022 2021 Deferred Tax Assets: Loss and loss adjustment expense reserves $ 214.9 $ 218.6 $ 214.2 Pension and deferred compensation plans 23.8 22.6 42.4 Realized loss from pending sale of mortgage insurance business 9.5 — — Net operating loss carryforward 5.5 7.6 9.6 AMT credit carryforward 9.0 9.0 9.0 Operating leases 46.4 46.7 49.7 Other temporary differences 16.3 17.1 12.3 Total deferred tax assets 325.4 321.6 337.5 Deferred Tax Liabilities: Unearned premium reserves 46.3 63.3 61.0 Deferred policy acquisition costs 82.8 76.0 68.5 Amortization of fixed income securities 14.6 6.8 5.2 Net unrealized investment gains 214.4 141.3 372.6 Title plants and records 2.8 2.8 2.8 Tax reform transition adjustment on loss and loss adjustment expense reserves 6.7 10.3 13.8 Operating leases 40.9 41.9 45.8 Other temporary differences 22.5 20.1 17.2 Total deferred tax liabilities 431.0 362.5 586.9 Net deferred tax liabilities (a) $ (105.6) $ (40.9) $ (249.5) __________ (a) RFIG Run-off deferred tax assets of $0.3 and deferred tax liabilities of $0.1 have been reclassified as held-for-sale as of December 31, 2023. See Note 2 for further discussion. At December 31, 2023, the Company had an available net operating loss (NOL) carryforward of $26.4 which will expire in years 2024 through 2029, and a $9.0 alternative minimum tax (AMT) credit carryforward. The NOL carryforward is subject to the limitations set by Section 382 of the Internal Revenue Code and is available to reduce future years' taxable income by a maximum of $9.8 each year until expiration. In valuing the deferred tax assets, the Company considered certain factors including primarily the scheduled reversals of certain deferred tax liabilities, estimates of future taxable income, the impact of available carryback and carryforward periods, as well as the availability of certain tax planning strategies. The Company estimates that all gross deferred tax assets at year-end 2023 will more likely than not be fully realized. Tax positions taken or expected to be taken in a tax return by the Company are recognized in the financial statements when it is more likely than not that the position would be sustained upon examination by tax authorities. To the best of management's knowledge there are no tax uncertainties that are expected to result in significant increases or decreases to unrecognized tax benefits within the next twelve month period. The Company views its income tax exposures as primarily consisting of timing differences whereby the ultimate deductibility of a taxable amount is highly certain but the timing of its deductibility is uncertain. Such differences relate principally to the timing of deductions for loss and premium reserves. As in prior examinations, the Internal Revenue Service (IRS) could assert that loss reserve deductions were overstated thereby reducing the Company's statutory taxable income in any particular year. The Company believes that it establishes its reserves fairly and consistently at each balance sheet date, and that it would succeed in defending its tax position in these regards. Because of the impact of deferred tax accounting, the possible accelerated payment of tax to the IRS would not necessarily affect the annual effective tax rate. The Company classifies interest and penalties as income tax expense in the consolidated statements of income. The Company is not currently under audit by the IRS and 2020 and subsequent tax years remain open. The Inflation Reduction Act (IRA) was enacted into law on August 16, 2022, which, among its many elements, imposes a Corporate Alternative Minimum Tax (CAMT) on the adjusted financial statement income at the rate of 15% for tax periods beginning on or after January 1, 2023. The Company, as a member of a controlled group, has determined it will be subject to the CAMT calculations for the year ended December 31, 2023. However, the Company expects to be a regular taxpayer and not a CAMT taxpayer. In addition, a Federal Excise Tax (FET) was enacted at the rate of 1% on all corporate stock buybacks effective January 1, 2023. The Company is subject to the FET, and an immaterial amount of excise tax incurred on stock repurchases has been recognized as part of the cost basis of the treasury stock acquired.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2023
Compensation Related Costs [Abstract]
Employee Benefit Plans	Employee Benefit Plans Pension Benefits The funded status of the Company's pension plan is reflected below. Years Ended December 31: 2023 2022 2021 Projected benefit obligation at beginning of year $ 452.8 $ 604.6 $ 639.7 Increases (decreases) during the year attributable to: Interest cost 23.4 16.4 15.2 Actuarial (gains) losses 10.9 (138.7) (22.2) Benefits paid (30.7) (29.5) (28.0) Net increase (decrease) for the year 3.6 (151.8) (35.1) Projected benefit obligation at end of year $ 456.4 $ 452.8 $ 604.6 Years Ended December 31: 2023 2022 2021 Fair value of net assets available for plan benefits At beginning of the year $ 507.1 $ 556.0 $ 479.6 Increases (decreases) during the year attributable to: Actual return on plan assets 44.2 (19.2) 104.4 Benefits paid (30.7) (29.5) (28.0) Net increase (decrease) for year 13.4 (48.8) 76.3 Fair value of net assets available for plan benefits At end of the year $ 520.6 $ 507.1 $ 556.0 Funded status $ 64.1 $ 54.3 $ (48.6) Amounts recognized in accumulated other comprehensive income $ (27.8) $ (38.5) $ (123.2) Funding of the Plan is dependent on a number of factors including actual performance versus actuarial assumptions made at the time of the actuarial valuation, as well as the maintenance of certain funding levels relative to regulatory requirements. The Company currently does not expect to make cash contributions in calendar year 2024 based on minimum funding requirements. Net periodic pension expense (income) recognized during 2023, 2022, and 2021 was $0.9, $(18.3), and $(9.8), respectively. The projected benefit obligation and net periodic benefit cost for the Plan were determined using the following weighted-average assumptions: Projected Benefit Obligation Net Periodic Benefit Cost As of December 31: 2023 2022 2023 2022 2021 Settlement discount rates 5.15 % 5.40 % 5.40 % 2.80 % 2.45 % Long-term rates of return on plan assets N/A N/A 4.60 % 7.00 % 7.00 % The assumed settlement discount rates were determined by matching the current estimate of the Plan's projected cash outflows against spot rate yields on a portfolio of high quality bonds as of the measurement date. To develop the expected long-term rate of return on assets assumption, historical returns, future return expectations for each asset class, as well as the target asset allocation of the pension portfolio were considered. The investment policy of the Plan takes into account the matching of assets and liabilities, appropriate risk aversion, liquidity needs, the preservation of capital, and the attainment of modest growth. The weighted-average asset allocations of the Plan were as follows: Current Investment Policy Asset Allocation % Range Target As of December 31: 2023 2022 Equity securities: Common shares of Company stock 16.0 % 13.5 % Other — 38.9 Subtotal 16.0 52.4 0% to 25% Fixed income securities 78.1 44.4 75% to 100% Other 5.9 3.2 1% to 10% Total 100.0 % 100.0 % Quoted values and other data provided by the respective investment custodians are used as inputs for determining fair value of the Plan's debt and equity securities. The custodians are understood to obtain market quotations and actual transaction prices for securities that have quoted prices in active markets and use their own proprietary method for determining the fair value of securities that are not actively traded. In general, these methods involve the use of "matrix pricing" in which the investment custodian uses observable market inputs, including, but not limited to, investment yields, credit risks and spreads, benchmarking of like securities, broker-dealer quotes, reported trades and sector groupings to determine a reasonable fair value. The following tables present a summary of the Plan's assets segregated among the various input levels described in Note 3. Fair Value Measurements As of December 31, 2023: Level 1 Level 2 Level 3 Total Equity securities: Company stock $ 83.1 $ — $ — $ 83.1 Fixed income securities 3.7 402.7 — 406.5 Other 17.0 — 7.3 24.3 Total at fair value $ 103.9 $ 402.7 $ 7.3 514.0 Securities at net asset value 6.5 Total $ 520.6 As of December 31, 2022: Equity securities: Common shares of Company stock $ 68.3 $ — $ — $ 68.3 Other 197.5 — — 197.5 Subtotal 265.8 — — 265.8 Fixed income securities — 225.0 — 225.0 Other 7.1 — 5.9 13.0 Total at fair value $ 273.0 $ 225.0 $ 5.9 504.0 Securities at net asset value 3.1 Total $ 507.1 Level 1 assets include U.S. Treasury notes, publicly traded common stocks, mutual funds, and short-term investments. Level 2 assets generally include corporate and government agency bonds. Level 3 assets primarily consist of an immediate participation guaranteed fund. The following table presents a summary of the benefits expected to be paid as of December 31, 2023 for the next 10 years: 2024 2025 2026 2027 2028 2029 and after December 31, 2023 $ 33.7 $ 34.3 $ 34.9 $ 34.6 $ 34.6 $ 169.4 Stock-Based Compensation As periodically amended, the Company has had a stock-based incentive compensation plan in effect for certain eligible employees since 1978. Stock-based compensation is currently awarded under the 2022 Incentive Compensation Plan (the 2022 Plan) which was adopted following approval by shareholders on May 26, 2022, thereby replacing the 2016 Incentive Compensation Plan (the 2016 Plan). Under the 2022 Plan, a total of 20.0 million new shares, plus the approximately 4.7 million shares that remained available for issuance under the 2016 Plan, became available for future awards through February 2032. The maximum number of shares available as of December 31, 2023 for future issuance under the 2022 Plan was approximately 17.7 million shares. The following table presents the stock-based compensation expense and income tax benefit recognized in the financial statements: Years Ended December 31: 2023 2022 2021 Stock-based compensation expense $ 19.5 $ 9.0 $ 3.2 Income tax benefit $ 4.1 $ 1.8 $ 0.6 As of December 31, 2023, there was $29.7 of total unrecognized compensation cost related to nonvested stock-based compensation arrangements. That cost is expected to be recognized over a weighted average period of approximately three Stock Options Stock options granted have an exercise price equal to the closing market price of the Company's common stock on the date of grant. All grants have a 10-year term. Options granted under the 2022 Plan vest ratably over three years at each anniversary date. Options granted under the 2016 and prior plans vest as follows: 10% as of December 31 of the year of the grant and, cumulatively, an additional 15%, 20%, 25%, and 30% on and after the second through fifth calendar years, respectively. The following table presents the key assumptions used to value the option awards granted during the periods presented. Expected volatilities are based on the historical experience of Old Republic's common stock. The expected term of stock options represents the period of time that stock options granted are assumed to be outstanding. The Company uses historical data to estimate the effect of stock option exercise and employee departure behavior; groups of employees that have similar historical behavior are considered separately for valuation purposes. The risk-free rate of return for periods within the contractual term of the share option is based on the U.S. Treasury rate in effect at the time of the grant. 2023 2022 2021 Expected volatility 0.23 0.22 0.20 Expected dividends 4.66 % 4.32 % 4.76 % Expected term (in years) 6 6 7 Risk-free rate 3.69 % 2.68 % 1.21 % A summary of stock option activity under the 2022 and 2016 Incentive Plans as of December 31, 2023, 2022, and 2021, and changes in outstanding options during the years then ended is presented below: As of and for the Years Ended December 31, 2023 2022 2021 Shares Weighted Shares Weighted Shares Weighted Outstanding at beginning of year 9,619,004 $ 20.68 8,344,470 $ 19.57 9,494,651 $ 18.36 Granted 2,990,000 25.22 2,660,000 23.28 2,216,250 21.30 Exercised 1,694,106 19.49 1,285,783 18.94 3,259,273 17.28 Forfeited and expired 44,684 22.04 99,683 19.78 107,158 18.32 Outstanding at end of year 10,870,214 22.10 9,619,004 20.68 8,344,470 19.57 Exercisable at end of year 4,790,571 $ 20.31 4,562,063 $ 19.53 4,652,951 $ 19.22 Weighted average fair value of options granted during the year (a) $ 3.76 per share $ 3.31 per share $ 1.86 per share __________ (a) Based on the Black-Scholes-Merton option pricing model and the assumptions outlined above. A summary of stock options outstanding and exercisable at December 31, 2023 follows: Options Outstanding Options Exercisable Weighted Average Weighted Exercise Prices Year of Grant Number Remaining Exercise Number $16.06 2014 74,788 0.25 $ 16.06 74,788 $ 16.06 $15.26 2015 123,061 1.25 15.26 123,061 15.26 $18.14 2016 252,893 2.25 18.14 252,893 18.14 $19.98 2017 407,633 3.25 19.98 407,633 19.98 $20.98 2018 573,174 4.25 20.98 573,174 20.98 $21.12 to $21.99 2019 973,628 5.25 21.16 973,628 21.16 $16.17 to $22.72 2020 1,295,913 6.25 17.45 878,634 17.50 $21.30 2021 1,761,193 7.25 21.30 829,759 21.30 $22.92 to $24.49 2022 2,429,431 8.25 23.30 677,001 23.33 $24.31 to $25.52 2023 2,978,500 9.25 25.22 — — Total 10,870,214 $ 22.10 4,790,571 $ 20.31 The cash received from stock option exercises, the total intrinsic value of stock options exercised, and the actual tax benefit realized for the tax deductions from option exercises are as follows: 2023 2022 2021 Cash received from stock option exercise $ 33.0 $ 24.3 $ 56.3 Intrinsic value of stock options exercised 17.5 7.9 24.2 Actual tax benefit realized for tax deductions from stock options exercised $ 3.6 $ 1.6 $ 5.0 Restricted Stock Awards The Company issues restricted common stock awards which represent a right to receive a share of stock. These awards are granted at market price, have voting rights unless otherwise provided in the applicable award agreement, and vest ratably over three A summary of restricted stock activity under the 2022 Incentive Plan as of December 31, 2023 and 2022, and changes in outstanding restricted stock awards during the years then ended is presented below: As of and for the Year Ended December 31, 2023 2022 Weighted Weighted Average Average Grant Date Grant Date Shares Fair Value Shares Fair Value Nonvested at beginning of year 659,874 $ 23.70 33,539 $ 21.32 Granted 823,907 25.15 644,356 23.76 Vested (225,289) 23.60 (16,901) 21.20 Forfeited (1,376) 25.05 (1,120) 22.34 Nonvested at end of year 1,257,116 $ 24.67 659,874 $ 23.70 Other Benefits The Company has a number of profit sharing and other incentive compensation programs for the benefit of a substantial number of its employees. The costs related to such programs are summarized below: Years Ended December 31: 2023 2022 2021 ORI 401(k) Savings and Profit Sharing Plan $ 65.8 $ 77.8 $ 70.5 Cash, deferred and other incentive compensation $ 81.2 $ 70.3 $ 71.8 Effective December 30, 2022, a profit sharing plan was merged into the Old Republic International Corporation Employees Savings and Stock Ownership Plan (ESSOP) and the merged plan was renamed the ORI 401(k) Savings and Profit Sharing Plan (the merged plan). A majority of the Company's employees participate in the merged plan. Annual Company contributions are provided in the form of cash and Old Republic common stock and are based on formulas applied to growth in net income excluding investment gains (losses) and underwriting profitability. The merged plan is currently leveraged and owns 3,955,122 unallocated shares as of December 31, 2023. Prior to the merger, the ESSOP purchased 2,200,000 shares ($34.0), 2,383,625 shares ($50.0), and 3,337,000 shares ($50.0) of Old Republic common stock during 2015, 2018, and 2020, respectively, all of which was financed by loans from the Company and its participating subsidiaries. As of December 31, 2023, there were 19,362,130 Old Republic common shares owned by the ORI 401(k) Savings and Profit Sharing Plan, of which 15,407,008 were allocated to employees' account balances. Dividends on unallocated shares are used to pay debt service costs. There are no repurchase obligations in existence. Cash, deferred, and other incentive compensation includes performance recognition compensation. Such amounts are generally determined based on performance metrics including premiums and fees growth, growth in operating earnings, underwriting results, and achieved return on equity in excess of a preset minimum. In March 2023, the Compensation Committee of the Company’s Board of Directors approved the Old Republic International Corporation 2023 Performance Recognition Plan (PRP), replacing the previous Key Employee Performance Recognition Plans, as a means of providing cash incentive compensation to named executive officers and certain other senior managers. The PRP is an objective performance-based program providing for annual payouts based on satisfaction of specified performance objectives and individual performance. Financial statement accruals established during 2023 reflect the Company’s estimate of annual performance-based incentive awards under the PRP. During the third quarter of 2023, certain structural changes were made to the previously deferred awards made under the Key Employee Performance Recognition Plans, resulting in a one-time charge of $10.7, reflected within underwriting, acquisition, and other expenses in the consolidated statement of income.

Net Income Per Share

Net Income Per Share	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Net Income Per Share	Net Income Per Share Consolidated basic earnings per share excludes the dilutive effect of common stock equivalents and is computed by dividing net income available to common stockholders by the weighted-average number of common shares actually outstanding for the year. Diluted earnings per share are similarly calculated with the inclusion of dilutive common stock equivalents. The following table provides a reconciliation of net income and the number of shares used in basic and diluted earnings per share calculations. Years Ended December 31: 2023 2022 2021 Numerator: Net Income $ 598.6 $ 686.4 $ 1,534.3 Denominator: Basic weighted-average shares (a) 282,732,526 301,676,941 301,945,319 Effect of dilutive securities - stock-based compensation awards 2,738,538 1,619,671 1,722,350 Diluted adjusted weighted-average shares (a) 285,471,064 303,296,612 303,667,669 Earnings per share: Basic $ 2.12 $ 2.28 $ 5.08 Diluted $ 2.10 $ 2.26 $ 5.05 Anti-dilutive common stock equivalents excluded from earnings per share computations: Stock-based compensation awards 2,234,500 2,645,750 — __________ (a) In calculating earnings per share, accounting standards require that common shares owned by the ORI 401(k) Savings and Profit Sharing Plan that are unallocated to participants in the plan be excluded from the calculation. Such shares are issued and outstanding and have the same voting and other rights applicable to all other common shares.

Credit Losses

Credit Losses	12 Months Ended
	Dec. 31, 2023
Credit Loss [Abstract]
Credit Losses	Credit Losses Credit losses on financial assets measured at amortized cost, primarily the Company's reinsurance recoverables and accounts and notes receivable, are recognized based on estimated losses expected to occur over the life of the asset. The expected credit losses, and subsequent adjustment to such losses, are recorded through an allowance account that is deducted from the amortized cost basis of the financial asset, with the net carrying value of the asset presented on the consolidated balance sheets. The Company's credit allowance was comprised of $17.5 and $16.0 related to reinsurance recoverables as of December 31, 2023 and 2022, respectively, and $26.1 and $27.0 related to accounts and notes receivable as of December 31, 2023 and 2022, respectively. No significant changes were made to the allowance during the three years ended December 31, 2023. The Company's evaluation of credit losses on available for sale fixed income investment securities is disclosed further in Note 3. The Company is not exposed to material concentrations of credit risks as to any one issuer of investment securities.

Debt

Debt	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Debt	Debt Consolidated debt of Old Republic and its subsidiaries is summarized below: December 31: 2023 2022 Carrying Fair Carrying Fair 4.875% issued in 2014 and due 2024 $ 399.5 $ 397.0 $ 399.0 $ 397.5 3.875% issued in 2016 and due 2026 548.5 530.4 547.9 522.1 3.850% issued in 2021 and due 2051 643.1 472.7 642.9 449.1 Other miscellaneous debt — — 7.1 7.1 Total debt $ 1,591.2 $ 1,400.3 $ 1,597.0 $ 1,375.9 On September 23, 2014, the Company completed a public offering of $400.0 aggregate principal amount of Senior Notes. The notes bear interest at a rate of 4.875% per year and mature on October 1, 2024. On August 26, 2016, the Company completed a public offering of $550.0 aggregate principal amount of Senior Notes. The notes bear interest at a rate of 3.875% per year and mature on August 26, 2026. On June 11, 2021, the Company completed a public offering of $650.0 aggregate principal amount of Senior Notes. The notes bear interest at a rate of 3.850% per year and mature on June 11, 2051. During 2023, 2022 and 2021, $67.2, $67.3, and $55.9, respectively, of interest expense on debt was charged to consolidated operations. Fair Value Measurements - The Company utilizes indicative market prices, which incorporate recent actual market transactions and current bid/ask quotations to estimate the fair value of outstanding debt classified within Level 2 of the fair value hierarchy as presented below. The Company uses an internally generated interest yield market matrix table, which incorporates maturity, coupon rate, credit quality, structure, and current market conditions to estimate the fair value of its debt securities that are classified within Level 3. The following table shows a summary of financial liabilities disclosed, but not carried, at fair value, segregated among the various input levels as described in Note 3: As of December 31: 2023 2022 Carrying Value $ 1,591.2 $ 1,597.0 Fair Value 1,400.3 1,375.9 Level 1 — — Level 2 1,400.3 1,368.7 Level 3 $ — $ 7.1

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2023
Shareholders' Equity [Abstract]
Stockholders' Equity	Shareholders' Equity Preferred Stock - At December 31, 2023, there were 75,000,000 shares of preferred stock authorized. The Company has designated one series of preferred stock: 10,000,000 shares of Series A Junior Participating Preferred Stock (Series A). No shares have been issued or are outstanding. The Series A Stock, if and when issued, will pay a dividend of the greater of $1.00 or 100 times (subject to adjustment) the aggregate per share amount (payable in kind) of all non-cash dividends or other distributions, other than a dividend payable in shares of common stock declared on the common stock of the Company. Each share of Series A stock would have 100 votes on each matter submitted to a vote of the shareholders. Common Stock - At December 31, 2023, there were 500,000,000 shares of common stock authorized. At the same date, there were 100,000,000 shares of Class B common stock authorized, though none were issued or outstanding. Class B common shares have the same rights as common shares except for being entitled to 1/10th of a vote per share. Common stock held by the ORI 401(k) Savings and Profit Sharing Plan is classified as a charge to the common shareholders' equity account until it is allocated to participating employees' accounts contemporaneously with the repayment of the debt incurred for its acquisition. Such unallocated shares are not considered outstanding for purposes of calculating earnings per share. Dividends on unallocated shares are used to pay debt service costs. Cash Dividend Restrictions - The payment of cash dividends by the Company is principally dependent upon the amount of its insurance subsidiaries' statutory policyholders' surplus available for dividend distribution. The insurance subsidiaries' ability to pay cash dividends to the parent company is in turn generally restricted by law or subject to approval of the insurance regulatory authorities. These authorities recognize only statutory accounting practices for determining financial position, results of operations, and the ability of an insurer to pay dividends to its shareholders. Based on year-end 2023 data, the maximum amount of dividends payable to the parent company by its insurance and a small number of non-insurance company subsidiaries during 2024 without the prior approval of appropriate regulatory authorities is approximately $854.5. Ordinary cash dividends declared during 2023, 2022, and 2021 to the parent company by its subsidiaries amounted to $673.3, $614.6, and $566.7, respectively. In addition to ordinary dividends, the Company's principal mortgage insurance subsidiaries sought and received approval from the North Carolina Department of Insurance to pay extraordinary dividends amounting to $110.0, $140.0, and $100.0 during 2023, 2022, and 2021, respectively. Cash Dividends - In addition to regular cash dividends, the Company's Board of Directors declared special cash dividends of $1.00 per share in August 2022 (paid on September 15, 2022), $1.50 per share in August 2021 (paid on October 6, 2021), and $1.00 per share in December 2020 (paid on January 15, 2021). Common Stock Repurchases - On August 18, 2022, the Board of Directors authorized a $450.0 share repurchase program. This authorization was completed during the second quarter of 2023. On May 12, 2023, the Board of Directors authorized a share repurchase program for an additional $450.0. Total 2023 share repurchases, inclusive of taxes and fees, under the programs mentioned above were 6.7 million shares for $168.7 (average price of $25.13) and 14.2 million shares for $366.5 (average price of $25.82), respectively. Following the close of the year and through February 20, 2024, the Company repurchased 2.9 million additional shares for $83.1 (average price of $28.33), completing its repurchase program under the most recent repurchase authorization, approved by the Company's Board of Directors on May 12, 2023.

Commitment and Contingencies

Commitment and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	General - In the normal course of business, the Company and its subsidiaries are subject to various contingent liabilities, including, but not limited to, possible income tax assessments resulting from tax law interpretations or issues raised by taxing or regulatory authorities in their regular examinations, catastrophic claim occurrences not indemnified by reinsurers such as noted in Note 6, or failure to collect all amounts on its investments or balances due from insureds and reinsurers. The Company does not have a basis for anticipating any significant losses or costs that could result from any known or existing contingencies. Legal Proceedings - Legal proceedings against the Company and its subsidiaries routinely arise in the normal course of business and usually pertain to claim matters related to insurance policies and contracts issued by its insurance subsidiaries. At December 31, 2023, the Company had no material non-claim litigation exposures in its consolidated business.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Lessor, Operating Leases	Leases Several of the Company's subsidiaries maintain their offices in leased premises. A number of these leases provide for the payment of real estate taxes, insurance, and other operating expenses. In addition, many of the subsidiaries also lease equipment for use in their businesses. Substantially all of the Company's leases are classified as operating leases. The Company presents assets and liabilities related to leases with a term greater than 12 months within other assets and liabilities in the consolidated balance sheets. The established right of use asset and corresponding lease liability was $194.4 and $ 220.2 222.1 In determining the lease liability, future lease payments are discounted at rates determined based on the type of underlying asset and remaining lease term. The weighted average discount rate was 5.49% and 5.27% as of December 31, 2023 and 2022, respectively, with an average remaining lease term of 6.9 years and 7.0 years at December 31, 2023 and 2022, respectively. Total lease costs were $76.3, $76.2, and $75.6 in 2023, 2022, and 2021, respectively. Fixed lease payments for 2023, 2022, and 2021 were $60.6, $64.0, and $65.0, respectively. The following table presents a summary of future undiscounted lease payments as of the dates shown: As of December 31: 2023 2022 Year 1 $ 58.1 $ 58.8 Year 2 51.0 50.6 Year 3 38.1 42.7 Year 4 29.0 30.1 Year 5 22.0 21.4 Thereafter 82.1 79.3 Total 280.6 283.1 Discount 60.4 60.9 Lease Liability $ 220.2 $ 222.1

Consolidated Quarterly Results

Consolidated Quarterly Results - Unaudited	12 Months Ended
	Dec. 31, 2023
Quarterly Financial Information Disclosure [Abstract]
Consolidated Quarterly Results - Unaudited	Consolidated Quarterly Results - Unaudited Old Republic's consolidated quarterly operating results for the two years ended December 31, 2023 and 2022 is presented below. In management's opinion, however, quarterly operating results for insurance enterprises such as the Company are not indicative of results to be achieved in succeeding quarters or years. The long-term nature of the insurance business, seasonal and cyclical factors affecting premium production, the fortuitous nature and, at times, delayed emergence of claims, and changes in yields on invested assets are some of the factors necessitating a review of operating results, changes in shareholders' equity, and cash flows for periods of several years to obtain a proper indicator of performance trends. The information below should be read in conjunction with the "Management Analysis of Financial Position and Results of Operations". In management's opinion, normal recurring adjustments necessary for a fair statement of quarterly results have been reflected in the information which follows. 1st 2nd 3rd 4th Year Ended December 31, 2023: Operating Summary: Net premiums, fees, and other income $ 1,594.6 $ 1,689.3 $ 1,801.1 $ 1,785.6 Net investment income and investment gains (losses) 164.0 108.9 (40.9) 155.4 Total revenues 1,758.7 1,798.3 1,760.1 1,941.1 Total expenses 1,509.5 1,601.4 1,696.2 1,703.6 Net income $ 199.8 $ 155.5 $ 52.6 $ 190.6 Net income per share: Basic $ 0.68 $ 0.55 $ 0.19 $ 0.70 Diluted $ 0.68 $ 0.54 $ 0.19 $ 0.69 Average shares outstanding: Basic 291,945,750 285,426,801 277,010,690 274,036,118 Diluted 293,993,474 287,882,787 279,924,410 277,226,628 1st 2nd 3rd 4th Year Ended December 31, 2022: Operating Summary: Net premiums, fees, and other income $ 1,955.2 $ 2,020.0 $ 1,983.1 $ 1,866.9 Net investment income and investment gains (losses) 251.3 (209.6) (262.0) 478.6 Total revenues 2,206.6 1,810.3 1,721.0 2,345.5 Total expenses 1,823.9 1,865.0 1,840.7 1,696.5 Net income (loss) $ 306.3 $ (40.1) $ (91.7) $ 512.1 Net income (loss) per share: Basic $ 1.01 $ (0.13) $ (0.31) $ 1.74 Diluted $ 1.00 $ (0.13) $ (0.31) $ 1.73 Average shares outstanding: Basic 303,582,578 303,793,432 303,652,802 294,290,072 Diluted 305,424,592 303,793,432 303,652,802 295,996,057

Information About Segments of B

Information About Segments of Business	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Information About Segments of Business	Segment Information The Company is engaged in the single business of insurance underwriting and related services. It conducts its operations through a number of regulated insurance company subsidiaries organized into three segments: General Insurance (property and liability insurance), Title Insurance, and RFIG Run-off (see Note 2 for further discussion). The results of a small life and accident insurance business are included within the Corporate & Other caption of this report. The Company does not derive over 10% of its consolidated revenues from any one customer. Revenues and assets connected with foreign operations are not significant in relation to consolidated totals. General Insurance provides property and liability insurance primarily to commercial clients. Old Republic does not have a meaningful participation in personal insurance coverages. Commercial auto is the largest type of coverage underwritten by General Insurance, accounting for 41.0% of the segment's net premiums earned in 2023. The remaining premiums written by General Insurance are derived largely from a wide variety of coverages, including workers' compensation, property, general liability, general aviation, directors' and officers' indemnity, fidelity and surety indemnities, and home and auto warranties. Title Insurance consists primarily of the issuance of policies to real estate purchasers and investors based upon searches of the public records which contain information concerning interests in real property. The policies insure against losses arising out of defects, liens, and encumbrances affecting the insured title and not excluded or excepted from the coverage of the policy. Private mortgage insurance produced by RFIG Run-off protects mortgage lenders and investors from default-related losses on residential mortgage loans made primarily to homebuyers who make down payments of less than 20% of the home's purchase price. The RFIG Run-off mortgage guaranty operations insures only first mortgage loans, primarily on residential properties incorporating one- to four-family dwelling units. Old Republic's business is managed for the long run. In this context management's key objectives are to achieve highly profitable operating results over the long term, and to ensure balance sheet strength for the primary needs of the insurance subsidiaries' underwriting and related services business. In this view, the evaluation of periodic and long-term results excludes consideration of net investment gains (losses). Under GAAP, however, net income, inclusive of net investment gains (losses), is the measure of total profitability. In management's opinion, the focus on income excluding net investment gains (losses), also described herein as segment pretax operating income, provides a better way to analyze, evaluate, and establish accountability for the results of the insurance operations. The inclusion of realized investment gains (losses) in net income can mask trends in operating results, because such realizations are often highly discretionary. Similarly, the inclusion of unrealized investment gains (losses) in equity securities can further distort such operating results with significant period-to-period fluctuations. The accounting policies of the segments parallel those described in the summary of significant accounting policies pertinent thereto. The contributions of Old Republic's insurance industry segments to consolidated totals are shown in the following table. Segmented and Consolidated Results Years Ended December 31: 2023 2022 2021 General Insurance: Net premiums earned $ 4,119.2 $ 3,808.6 $ 3,555.5 Net investment income and other income 625.0 507.0 486.9 Total revenues excluding investment gains $ 4,744.3 $ 4,315.6 $ 4,042.5 Segment pretax operating income (a) $ 787.8 $ 689.8 $ 589.6 Title Insurance: Net premiums earned $ 2,300.9 $ 3,500.6 $ 3,960.5 Title, escrow and other fees 261.8 333.2 443.8 Subtotal 2,562.8 3,833.8 4,404.3 Net investment income and other income 57.8 48.8 44.9 Total revenues excluding investment gains $ 2,620.6 $ 3,882.7 $ 4,449.3 Segment pretax operating income (a) $ 133.5 $ 308.8 $ 515.7 RFIG Run-off Net premiums earned $ 16.4 $ 23.2 $ 32.6 Net investment income and other income 6.3 6.7 11.4 Total revenues excluding investment gains $ 22.7 $ 30.0 $ 44.1 Segment pretax operating income $ 21.2 $ 35.2 $ 32.8 Consolidated Revenues: Total revenues of Company segments $ 7,387.8 $ 8,228.3 $ 8,536.0 Corporate & Other (b) 208.0 195.5 166.6 Consolidated investment gains (losses): Realized from actual transactions and impairments (c) (67.0) 62.2 6.9 Unrealized from changes in fair value of equity securities (123.9) (263.4) 751.1 Total realized and unrealized investment gains (losses) (190.9) (201.1) 758.0 Consolidation elimination adjustments (146.5) (138.9) (119.0) Consolidated revenues $ 7,258.3 $ 8,083.7 $ 9,341.6 Consolidated Pretax Income: Total segment pretax operating income of Company segments $ 942.6 $ 1,033.9 $ 1,138.2 Corporate & Other (b) (4.2) 24.6 25.7 Consolidated investment gains (losses): Realized from actual transactions and impairments (c) (67.0) 62.2 6.9 Unrealized from changes in fair value of equity securities (123.9) (263.4) 751.1 Total realized and unrealized investment gains (losses) (190.9) (201.1) 758.0 Consolidated income before income taxes $ 747.4 $ 857.4 $ 1,922.1 December 31: 2023 2022 Consolidated Assets: General Insurance $ 22,710.5 $ 21,227.9 Title Insurance 1,948.2 2,077.6 RFIG Run-off (d) 232.8 344.2 Total assets of Company segments 24,891.7 23,649.9 Corporate & Other (b) 1,912.9 1,736.8 Consolidation elimination adjustments (303.2) (227.2) Consolidated assets $ 26,501.4 $ 25,159.4 __________ (a) Segment pretax operating income is reported net of interest charges on intercompany financing arrangements with Old Republic's holding company parent for the following segments: General - $76.5, $68.9, and $63.5 for the years ended December 31, 2023, 2022, and 2021, respectively; Title - $–, $0.8, and $1.9 for the years ended December 31, 2023, 2022, and 2022, respectively. (b) Includes amounts for a small life and accident insurance business as well as those of the parent holding company and its internal corporate services subsidiaries. (c) Includes an estimated pretax loss of $ 45.6 (d) At December 31, 2023, the Company classified its RFIG Run-off mortgage insurance business as held-for-sale in its consolidated balance sheet. See Note 2 for further discussion.

Transactions with Affiliates

Transactions with Affiliates	12 Months Ended
	Dec. 31, 2023
Transactions with Affiliates [Abstract]
Transactions with Affiliates	Transactions with Affiliates The Company is affiliated with a policyholder owned mutual insurer, American Business & Mercantile Insurance Mutual, Inc. ("AB&M" or "the Mutual") whose formation it sponsored in 1981. The Mutual is managed through a service agreement with several Old Republic subsidiaries. AB&M's underwriting operations are limited to certain types of coverages not provided by Old Republic, and to a small amount of intercompany reinsurance placements. The following table shows certain information reflective of such business: Assumed from Old Republic Ceded to Old Republic Years Ended December 31: 2023 2022 2021 2023 2022 2021 Premiums earned $ 0.7 $ 0.3 $ 1.5 $ — $ 0.1 $ 0.2 Commissions and fees 0.1 0.1 0.4 — — — Losses and loss expenses 2.9 0.9 1.1 — 0.1 0.5 Loss and loss expense reserves 4.3 7.1 8.5 1.4 2.7 3.1 Unearned premiums $ — $ — $ — $ — $ — $ — As of December 31, 2023 and 2022, the Mutual's statutory capital included surplus notes due to Old Republic of $10.5 out of total statutory capital of $62.4 and $58.8, respectively.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event The Company evaluated subsequent events through the date the consolidated financial statements were issued. No subsequent events were identified that require adjustment or disclosure to the consolidated financial statements.

Schedule I - Summary of Investm

Schedule I - Summary of Investments - Other Than Investments in Related Parties	12 Months Ended
	Dec. 31, 2023
Schedule I - Summary of Investments - Other Than Investments in Related Parties [Abstract]
Schedule I - Summary of Investments, Other than Investments in Related Parties	OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE I - SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES As of December 31, 2023 ($ in Millions) Column A Column B Column C Column D Type of investment Cost (a) Fair Amount at Fixed income securities: United States Government and government agencies and authorities $ 1,695.3 $ 1,641.5 $ 1,641.5 States, municipalities and political subdivisions 774.5 767.6 767.6 Foreign government 224.9 217.3 217.3 Corporate, industrial and all other 9,568.1 9,513.3 9,513.3 12,263.0 12,139.9 12,139.9 Short-term investments 1,032.6 1,032.6 Total 13,295.6 13,172.5 Equity securities: Non-redeemable preferred stocks 5.6 6.2 6.2 Common stocks: Banks, trusts and insurance companies 79.0 163.7 163.7 Industrial, miscellaneous and all other 1,427.2 2,490.8 2,490.8 1,511.9 2,660.8 2,660.8 Other investments 34.3 34.3 Total investments $ 14,841.8 $ 15,867.7 __________ (a) Represents original cost of equity securities, and as to fixed incomes, original cost reduced by repayments and adjusted for amortization of premium or accrual of discount.

Schedule II - Condensed Financi

Schedule II - Condensed Financial Information of Registrant	12 Months Ended
	Dec. 31, 2023
Balance Sheets [Abstract]
Condensed Financial Information of Registrant	OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT BALANCE SHEETS OLD REPUBLIC INTERNATIONAL CORPORATION (PARENT COMPANY) ($ in Millions) December 31, 2023 2022 Assets: Bonds and notes $ 10.5 $ 10.5 Short-term investments 21.1 35.1 Cash 5.0 2.0 Investments in, and indebtedness of related parties 8,027.7 7,823.0 Other assets 116.6 104.8 Total assets $ 8,181.0 $ 7,975.5 Liabilities and Common Shareholders' Equity: Liabilities: Accounts payable and accrued expenses $ 69.6 $ 98.8 Debt and debt equivalents 1,591.2 1,589.9 Indebtedness to affiliates and subsidiaries 109.4 120.5 Total liabilities 1,770.3 1,809.2 Common shareholders' equity: Common stock 278.3 296.9 Additional paid-in capital 678.7 1,141.8 Retained earnings 5,644.3 5,321.8 Accumulated other comprehensive loss (132.4) (517.8) Unallocated 401(k) plan shares (at cost) (58.2) (69.5) Total common shareholders' equity 6,410.7 6,173.2 Total liabilities and common shareholders' equity $ 8,181.0 $ 7,975.5 OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT STATEMENTS OF INCOME OLD REPUBLIC INTERNATIONAL CORPORATION (PARENT COMPANY) ($ in Millions) Years Ended December 31, 2023 2022 2021 Revenues: Investment income from subsidiaries $ 122.0 $ 118.0 $ 100.3 Real estate and other income 4.1 4.2 4.3 Other investment income 4.8 1.2 0.2 Realized investment losses (4.5) — — Total revenues 126.5 123.6 104.9 Expenses: Interest - subsidiaries 4.2 3.9 3.9 Interest - other 67.1 67.1 55.9 Real estate and other expenses 4.8 4.5 4.7 General expenses, taxes and fees 57.1 23.6 17.4 Total expenses 133.3 99.2 82.0 Revenues, net of expenses (6.8) 24.3 22.8 Federal income taxes (credits) (0.8) 2.9 (0.9) Income (loss) before equity in earnings of subsidiaries (5.9) 21.3 23.7 Equity in earnings (loss) of subsidiaries: Dividends received 673.3 614.6 566.7 Earnings (loss) in excess of dividends (68.6) 50.5 943.8 Net Income $ 598.6 $ 686.4 $ 1,534.3 OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT STATEMENTS OF CASH FLOWS OLD REPUBLIC INTERNATIONAL CORPORATION (PARENT COMPANY) ($ in Millions) Years Ended December 31, 2023 2022 2021 Cash flows from operating activities: Net income $ 598.6 $ 686.4 $ 1,534.3 Adjustments to reconcile net income to net cash provided by operating activities: Accounts receivable (0.9) — 0.6 Income taxes - net (49.8) 59.4 (17.9) Excess of equity in (earnings) loss of subsidiaries over cash dividends received 68.6 (50.5) (943.8) Realized investment losses 4.5 — — Accounts payable, accrued expenses and other 14.7 (34.8) 11.5 Total 635.8 660.6 584.7 Cash flows from investing activities: Sale of fixed assets for Company use — — 0.1 Purchase of fixed assets for Company use (3.2) (4.1) (6.9) Net repayment (issuance) of notes to related parties 54.6 64.9 (351.6) Net decrease (increase) in short-term investments 13.9 (23.8) 21.5 Investment in, and indebtedness of related parties - net 85.0 140.0 100.0 Total 150.3 176.9 (236.9) Cash flows from financing activities: Issuance of debentures and notes — — 642.5 Net receipt (repayment) of notes and loans from related parties (5.1) (4.8) (13.5) Issuance of common shares 31.1 26.6 60.0 Redemption of debentures and notes — — (19.5) Dividends on common shares (275.5) (579.7) (1,019.2) Repurchase of common stock (535.3) (281.2) — Other - net 1.7 1.5 2.0 Total (783.1) (837.6) (347.6) Increase (decrease) in cash 3.0 — 0.1 Cash, beginning of year 2.0 2.0 1.9 Cash, end of year $ 5.0 $ 2.0 $ 2.0 OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT NOTES TO CONDENSED FINANCIAL STATEMENTS ($ in Millions) Note 1 - Summary of Significant Accounting Policies Old Republic International Corporation's (the Company or Old Republic) condensed financial statements are presented in accordance with the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) of accounting principles generally accepted in the United States of America (GAAP) and should be read in conjunction with the consolidated financial statements and notes thereto of Old Republic International Corporation and Subsidiaries included in its Annual Report on Form 10-K. Prior period amounts have been reclassified whenever appropriate to conform to the most current presentation. Note 2 - Investments in Consolidated Subsidiaries Old Republic International Corporation's investments in consolidated subsidiaries are reflected in the condensed financial statements in accordance with the equity method of accounting. Undistributed earnings in excess of dividends received are recorded as separate line items in the condensed statements of income. Note 3 - Debt On September 23, 2014, the Company completed a public offering of $400.0 aggregate principal amount of Senior Notes. The notes bear interest at a rate of 4.875% per year and mature on October 1, 2024. On August 26, 2016, the Company completed a public offering of $550.0 aggregate principal amount of Senior Notes. The notes bear interest at a rate of 3.875% per year and mature on August 26, 2026. On June 11, 2021, the Company completed a public offering of $650.0 aggregate principal amount of Senior Notes. The notes bear interest at a rate of 3.850% per year and mature on June 11, 2051. Note 4 - Common Stock Repurchases On August 18, 2022, the Board of Directors authorized a $450.0 share repurchase program. This authorization was completed during the second quarter of 2023. On May 12, 2023, the Board of Directors authorized a share repurchase program for an additional $450.0. Total 2023 share repurchases, inclusive of taxes and fees, under the programs mentioned above were 6.7 million shares for $168.7 (average price of $25.13) and 14.2 million shares for $366.5 (average price of $25.82), respectively. Following the close of the year and through February 20, 2024, the Company repurchased 2.9 million additional shares for $83.1 (average price of $28.33), completing its repurchase program under the most recent repurchase authorization, approved by the Company's Board of Directors on May 12, 2023.

Schedule III - Supplementary In

Schedule III - Supplementary Insurance Information	12 Months Ended
	Dec. 31, 2023
Schedule III - Supplementary Insurance Information [Abstract]
Schedule III - Supplementary Insurance Information	OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION For the Years Ended December 31, 2023, 2022 and 2021 ($ in Millions) Column A Column B Column C Column D Column E Column F Segment Deferred Loss and Loss Adjustment Expense Reserves Unearned Other Premium Year Ended December 31, 2023: Insurance Underwriting: General Insurance $ 417.6 $ 6,955.2 $ 2,253.1 $ 109.3 $ 4,119.2 Title Insurance — 598.5 — 1.5 2,300.9 RFIG Run-off (a) — — — — 16.4 Corporate & Other (b) 0.2 6.6 — 30.8 9.1 Reinsurance Recoverable (c) — 4,977.7 789.5 8.6 — Consolidated $ 417.8 $ 12,538.2 $ 3,042.6 $ 150.4 $ 6,445.9 Year Ended December 31, 2022: Insurance Underwriting: General Insurance $ 382.2 $ 6,824.8 $ 2,028.5 $ 137.1 $ 3,808.6 Title Insurance — 612.8 — 3.3 3,500.6 RFIG Run-off — 77.9 0.1 — 23.2 Corporate & Other (b) 0.2 6.3 — 31.8 9.6 Reinsurance Recoverable (c) — 4,699.5 759.1 9.8 — Consolidated $ 382.5 $ 12,221.5 $ 2,787.8 $ 182.2 $ 7,342.1 Year Ended December 31, 2021: Insurance Underwriting: General Insurance $ 349.9 $ 6,587.0 $ 1,870.7 $ 133.6 $ 3,555.5 Title Insurance — 594.2 — 6.2 3,960.5 RFIG Run-off — 111.2 0.2 — 32.6 Corporate & Other (b) 0.5 7.6 — 39.4 11.0 Reinsurance Recoverable (c) — 4,125.3 688.4 11.3 — Consolidated $ 350.4 $ 11,425.5 $ 2,559.4 $ 190.6 $ 7,559.8 __________ (a) RFIG Run-off loss and loss adjustment expense reserves of $54.9 and unearned premiums of $0.1 have been classified as held-for-sale as of December 31, 2023. See Note 2 in the Notes to Consolidated Financial Statements included in the Annual Report on Form 10-K for further discussion. (b) Includes amounts for a small life and accident insurance business as well as those of the parent holding company, its internal corporate services subsidiaries and consolidation elimination adjustments. (c) In accordance with GAAP, reinsured losses and unearned premiums are to be reported as assets. Assets and liabilities were, as a result, increased by corresponding amounts of approximately $5.7 billion, $5.4 billion, and $4.8 billion at December 31, 2023, 2022, and 2021, respectively. This accounting treatment does not have any effect on the Company's results of operations. OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION For the Years Ended December 31, 2023, 2022 and 2021 ($ in Millions) Column A Column G Column H Column I Column J Column K Segment Net Loss and Loss Adjustment Expenses Amortization Other Premiums Year Ended December 31, 2023: Insurance Underwriting: General Insurance $ 462.7 $ 2,553.3 $ 680.0 $ 723.0 $ 4,356.3 Title Insurance 57.0 48.7 — 2,438.2 2,300.9 RFIG Run-off (a) 6.3 (11.0) — 12.5 16.4 Corporate & Other (b) 52.2 5.5 — 60.1 9.1 Reinsurance Recoverable (c) — — — — — Consolidated $ 578.3 $ 2,596.6 $ 680.0 $ 3,234.1 $ 6,682.9 Year Ended December 31, 2022: Insurance Underwriting: General Insurance $ 358.0 $ 2,364.6 $ 591.2 $ 669.5 $ 3,978.2 Title Insurance 47.9 89.1 — 3,484.6 3,500.6 RFIG Run-off 6.7 (17.5) — 12.3 23.1 Corporate & Other (b) 46.8 4.0 0.2 28.0 9.6 Reinsurance Recoverable (c) — — — — — Consolidated $ 459.5 $ 2,440.2 $ 591.4 $ 4,194.5 $ 7,511.6 Year Ended December 31, 2021: Insurance Underwriting: General Insurance $ 342.4 $ 2,303.1 $ 501.9 $ 648.0 $ 3,680.9 Title Insurance 43.8 112.9 — 3,820.6 3,960.5 RFIG Run-off 11.4 (1.7) — 13.0 32.4 Corporate & Other (b) 36.5 6.5 0.3 14.5 10.9 Reinsurance Recoverable (c) — — — — — Consolidated $ 434.3 $ 2,420.9 $ 502.2 $ 4,496.3 $ 7,685.0 __________ (a) RFIG Run-off loss and loss adjustment expense reserves of $54.9 and unearned premiums of $0.1 have been classified as held-for-sale as of December 31, 2023. See Note 2 in the Notes to Consolidated Financial Statements included in the Annual Report on Form 10-K for further discussion. (b) Includes amounts for a small life and accident insurance business as well as those of the parent holding company, its internal corporate services subsidiaries and consolidation elimination adjustments. (c) In accordance with GAAP, reinsured losses and unearned premiums are to be reported as assets. Assets and liabilities were, as a result, increased by corresponding amounts of approximately $5.7 billion, $5.4 billion, and $4.8 billion at December 31, 2023, 2022, and 2021, respectively. This accounting treatment does not have any effect on the Company's results of operations.

Schedule IV - Reinsurance

Schedule IV - Reinsurance	12 Months Ended
	Dec. 31, 2023
Schedule IV - Reinsurance [Abstract]
Schedule IV - Reinsurance	OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE IV - REINSURANCE For the Years Ended December 31, 2023, 2022 and 2021 ($ in Millions) Column A Column B Column C Column D Column E Column F Gross Ceded Assumed Net Percentage Year Ended December 31, 2023: Life insurance in force $ 933.8 $ 563.3 $ — $ 370.4 — % Premium Revenues: General Insurance $ 6,513.2 $ 2,488.6 $ 94.7 $ 4,119.2 2.3 % Title Insurance 2,299.1 — 1.8 2,300.9 0.1 RFIG Run-off 16.4 — — 16.4 — Life and Health Insurance: Life insurance 6.5 2.6 — 3.8 — Accident and health insurance 11.1 5.8 — 5.3 — Total Life & Health Insurance 17.6 8.4 — 9.1 — Consolidating adjustments — (0.3) (0.3) — — Consolidated $ 8,846.4 $ 2,496.7 $ 96.2 $ 6,445.9 1.5 % Year Ended December 31, 2022: Life insurance in force $ 1,266.7 $ 784.5 $ — $ 482.1 — % Premium Revenues: General Insurance $ 6,021.0 $ 2,299.5 $ 87.1 $ 3,808.6 2.3 % Title Insurance 3,498.1 0.1 2.6 3,500.6 0.1 RFIG Run-off 23.2 — — 23.2 — Life and Health Insurance: Life insurance 7.1 3.2 — 3.9 — Accident and health insurance 13.7 8.0 — 5.6 — Total Life & Health Insurance 20.8 11.2 — 9.6 — Consolidating adjustments — (0.3) (0.3) — — Consolidated $ 9,563.3 $ 2,310.5 $ 89.4 $ 7,342.1 1.2 % Year Ended December 31, 2021: Life insurance in force $ 1,473.2 $ 878.5 $ — $ 594.6 — % Premium Revenues: General Insurance $ 5,509.1 $ 2,027.3 $ 73.7 $ 3,555.5 2.1 % Title Insurance 3,958.6 — 1.8 3,960.5 — RFIG Run-off 32.6 — — 32.6 — Life and Health Insurance: Life insurance 7.8 3.0 — 4.8 — Accident and health insurance 15.2 9.0 — 6.1 — Total Life & Health Insurance 23.1 12.1 — 11.0 — Consolidating adjustments — (0.4) (0.4) — — Consolidated $ 9,523.6 $ 2,039.0 $ 75.1 $ 7,559.8 1.0 %

Schedule V - Valuation and Qual

Schedule V - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2023
Schedule V - Valuation and Qualifying Accounts [Abstract]
Schedule V - Valuation and Qualifying Accounts	OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE V - VALUATION AND QUALIFYING ACCOUNTS For the Years Ended December 31, 2023, 2022 and 2021 ($ in Millions) Column A Column B Column C Column D Column E Additions Description Balance at Charged to Costs and Expenses (a) Charged to Other Accounts - Describe Deductions - Balance at Year Ended December 31, 2023: Deducted from Asset Accounts: Reserve for credit losses $ 43.0 $ 0.6 $ — $ — $ 43.6 Year Ended December 31, 2022: Deducted from Asset Accounts: Reserve for credit losses $ 40.1 $ 2.9 $ — $ — $ 43.0 Year Ended December 31, 2021: Deducted from Asset Accounts: Reserve for credit losses $ 36.5 $ 3.5 $ — $ — $ 40.1 __________

Schedule VI - Supplemental Info

Schedule VI - Supplemental Information Concerning Property-Casualty Insurance Operations	12 Months Ended
	Dec. 31, 2023
Schedule VI - Supplemental Information Concerning Property-Casualty Insurance Operations [Abstract]
Schedule VI - Supplemental Information Concerning Property-Casualty Insurance Operations	OLD REPUBLIC INTERNATIONAL CORPORATION AND SUBSIDIARIES SCHEDULE VI - SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS For the Years Ended December 31, 2023, 2022 and 2021 ($ in Millions) Column A Column B Column C Column D Column E Affiliation With Registrant (a) Deferred Loss and Loss Adjustment Expense Reserves (b) Discount, Unearned Premiums (b) Year Ended December 31: 2023 $ 417.6 $ 6,955.2 $ 179.9 $ 2,253.1 2022 382.2 6,824.8 184.7 2,028.5 2021 349.9 6,587.0 174.8 1,870.7 Column A Column F Column G Column H Net Loss and Loss Adjustment Expenses Affiliation With Registrant (a) Earned Current Prior Year Ended December 31: 2023 $ 4,119.2 $ 462.7 $ 2,770.7 $ (234.0) 2022 3,808.6 358.0 2,545.1 (193.1) 2021 3,555.5 342.4 2,418.3 (137.9) Column A Column I Column J Column K Affiliation With Registrant (a) Amortization Paid Premiums Year Ended December 31: 2023 $ 680.0 $ 2,406.2 $ 4,356.3 2022 591.2 2,114.2 3,978.2 2021 501.9 2,021.3 3,680.9 __________ (a) Includes consolidated property-casualty entities. The amounts relating to the Company's unconsolidated property-casualty subsidiaries and the proportionate share of the registrant's and its subsidiaries' 50%-or-less owned property-casualty equity investees are immaterial and have, therefore, been omitted from this schedule. (b) See note (c) to Schedule III.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Accounting, Policy	Accounting Principles - The Company's insurance subsidiaries are managed pursuant to the laws and regulations of the various states in which they operate. As a result, the subsidiaries operate their business in the context of such laws and regulations and maintain their accounts in conformity with accounting practices prescribed or permitted by various states' insurance regulatory authorities. Federal income taxes and dividends to shareholders are based on financial statements and reports complying with such practices. The statutory accounting requirements vary from the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) of accounting principles generally accepted in the United States of America (GAAP) in the following major respects: • the costs of selling insurance policies are charged to operations immediately, while the related premiums are recognized as income over the terms of the policies. Ceding commissions received in excess of such acquisition costs are amortized over the effective period of the premiums ceded under the related reinsurance agreement; • investments in fixed income securities designated as available for sale are generally carried at amortized cost rather than their estimated fair value; • changes in the fair value of equity securities are recorded directly in earned surplus and not through the income statement as required under GAAP unless such securities are determined to be other-than-temporarily impaired for statutory reporting purposes; • certain assets classified as "nonadmitted assets" are excluded from the balance sheet through a direct charge to earned surplus; • changes in deferred income tax assets or liabilities are recorded directly in earned surplus and not through the income statement; • mortgage guaranty contingency reserves intended to provide for future catastrophic losses are established as a liability through a charge to earned surplus whereas GAAP does not allow provisions for future catastrophic losses; • title insurance premium reserves intended to cover losses that will be reported at a future date are based on statutory formulas, and changes therein are charged in the income statement against each year's premiums written; • certain required formula-derived reserves for general insurance in particular are established for loss reserves in excess of amounts considered adequate by the Company as well as for credits taken relative to reinsurance placed with other insurance companies not licensed in the respective states, all of which are charged directly against earned surplus; and • surplus notes are classified as surplus rather than a liability. The Company has made necessary adjustments to the statutory financial statements of its insurance subsidiaries to conform their accounts with GAAP for these Consolidated Financial Statements and Notes. The following table reflects a summary of all such adjustments: Shareholders' Equity Net Income December 31, Years Ended December 31, 2023 2022 2023 2022 2021 Statutory totals of insurance company subsidiaries: General Insurance $ 4,607.8 $ 4,763.4 $ 594.3 $ 549.2 $ 496.8 Title Insurance 673.9 742.7 152.3 224.9 285.7 RFIG Run-off 131.1 141.8 9.8 70.5 27.3 Life and Accident 56.6 57.4 5.2 5.0 3.6 Subtotal 5,469.4 5,705.3 761.6 849.6 813.4 GAAP totals of non-insurance company subsidiaries and consolidation adjustments 1,058.6 1,023.7 (77.2) 11.3 177.0 Unadjusted totals 6,527.9 6,729.0 684.3 860.8 990.4 Adjustments to conform to GAAP statements: Deferred policy acquisition costs 286.7 252.9 34.9 26.3 9.4 Investment adjustments (102.6) (537.6) (109.1) (252.4) 606.6 Nonadmitted assets 207.3 173.9 — — — Deferred income taxes (95.1) 4.0 26.2 35.4 (135.3) Mortgage contingency reserves 38.4 127.7 — — — Title insurance premium reserves 733.7 777.5 (43.7) 42.5 109.4 Loss and loss adjustment expenses (535.8) (548.8) 17.1 (25.2) (48.7) Surplus notes (696.5) (844.5) — — — Other adjustments 46.4 38.9 (11.2) (0.7) 2.4 Total adjustments (117.5) (556.2) (85.7) (174.4) 543.6 Consolidated GAAP totals $ 6,410.7 $ 6,173.2 $ 598.6 $ 686.4 $ 1,534.3 __________ The insurance laws of the respective states in which the Company’s insurance subsidiaries are incorporated prescribe minimum capital and surplus requirements for the lines of business they are licensed to write. For domestic property and casualty and life and accident insurance companies the National Association of Insurance Commissioners also prescribes risk-based capital (RBC) requirements. RBC is a measure of statutory capital in relationship to a formula-driven definition of risk relative to a company’s balance sheet and mix of business. The combined RBC ratio of the primary General Insurance subsidiaries was 609% and 654% of the company action level RBC at December 31, 2023 and 2022, respectively. The minimum capital requirements for the Company’s Title Insurance subsidiaries are established by statute in the respective states of domicile. The minimum regulatory capital requirements are not significant in relationship to the recorded statutory capital of the Company’s Title and Life and Accident insurance subsidiaries. At December 31, 2023 and 2022 each of the Company’s General, Title, RFIG Run-off, and Life and Accident insurance subsidiaries exceeded the minimum statutory capital and surplus requirements. The preparation of financial statements in conformity with either statutory practices or GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Accordingly, actual results could differ from those estimates.
Consolidation Practices	Consolidation Practices - The consolidated financial statements include the accounts of the Company and those of all of its majority owned insurance underwriting and service subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.
Statement Presentation	Statement Presentation - Amounts shown in the consolidated financial statements and applicable notes are stated (except as otherwise indicated and as to share data) in millions, which amounts may not add to totals shown due to truncation. Prior period amounts have been reclassified whenever appropriate to conform to the most current presentation.
New Accounting Pronouncements, Policy	Accounting Standard Adoption - On January 1, 2023, the Company adopted FASB Accounting Standards Update (ASU) No. 2018-12, Financial Services-Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts . The standard requires insurance companies with long-duration contracts to review and update the assumptions used to measure expected cash flows at least annually, with changes flowing through the income statement, update the discount rate assumption at each reporting date, with changes flowing through other comprehensive income, and enhance disclosures related to the liability. The standard most significantly impacts the discount rate used in estimating reserves for the Company’s life insurance business which is in run-off. The guidance was applied using a modified retrospective approach as of January 1, 2021, resulting in changes to other policyholders’ benefits and funds held, and a net of tax opening equity adjustment to retained earnings and accumulated other comprehensive income, neither of which had a material impact on the consolidated financial statements. No other new accounting standards were adopted in 2023 that materially impacted the consolidated financial statements.
Accounting Standards Pending Adoption	Accounting Standards Pending Adoption – In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting: Improvements to Reportable Segment Disclosures . This guidance expands the breadth and frequency of segment disclosures, including additional disclosures about significant segment expenses. Among other requirements, the guidance: • Introduces a new requirement to disclose certain significant segment expenses regularly provided to the chief operating decision maker (CODM), • Extends certain annual disclosures to interim periods, • Permits more than one measure of segment profit or loss to be reported under certain conditions, and • Requires disclosure of the title and position of the CODM. The ASU does not change how an entity identifies its operating segments, aggregates those operating segments, or applies the quantitative thresholds to determine its reportable segments. The requirements will be effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company continues to evaluate the requirements of this new guidance. In December 2023, the FASB issued ASU No. 2023-09, Improvements to Income Tax Disclosures which will require further disaggregation of existing disclosures for the effective tax rate reconciliation and income taxes paid. More specifically, the amendments will require entities to disclose: • A tabular effective tax rate reconciliation, broken out into specific categories with certain reconciling items above a 5% threshold further broken out by nature and/or jurisdiction, and • Income taxes paid (net of refunds received), broken out between federal, state and foreign, and net amounts paid to an individual jurisdiction that exceed 5% of the total. The requirements will be effective for fiscal years beginning after December 15, 2024. The Company continues to evaluate the requirements of this new guidance.
Investments	Investments - The Company classifies its fixed income securities as those it either (1) has the intent and ability to hold until maturity, (2) has available for sale, or (3) has the intention of trading. The Company's fixed income portfolio is classified as available for sale as of December 31, 2023 and 2022. Fixed income securities classified as available for sale are reported at fair value with changes in such values, net of deferred income taxes, reflected directly in shareholders' equity. Equity securities are reported at fair value with changes in such values reflected as unrealized investment gains (losses) in the consolidated statements of income. Fair values are based on quoted market prices or estimates using values obtained from recognized independent pricing services. The status and fair value changes of fixed income investments are reviewed at least once per quarter to assess whether a decline in fair value of an investment below its cost basis is the result of a credit loss. Factors considered in making this assessment include a security's market price history, as well as the issuer's operating results, financial condition and liquidity, its ability to access capital markets and to make scheduled principal or interest payments, credit rating trends, most current audited financial statements, industry and securities markets conditions and analyst expectations. Sudden fair value declines caused by such adverse developments as newly emerged or imminent bankruptcy filings, issuer default on significant obligations, or reports of financial accounting developments that bring into question the validity of the issuer's previously reported earnings or financial condition are recognized as realized losses as soon as credible publicly available information emerges to confirm such developments. Credit losses are recorded through an allowance with the corresponding charge to realized investment gains (losses). If the Company intends to sell or is more likely than not required to sell a security, the asset is written down to fair value directly through realized investment gains (losses). Investment income is reported net of allocated expenses and includes appropriate adjustments for amortization of premium and accretion of discount on fixed income securities acquired at other than par value. Dividends on equity securities are credited to income on the ex-dividend date. At December 31, 2023, the Company and its subsidiaries did not have significant amounts of non-income producing securities. Investment gains and losses, which result from sales or write-downs of securities, are reflected as revenues in the income statement and are determined on the basis of amortized value at date of sale for fixed income securities, and cost in regard to equity securities; such bases apply to the specific securities sold.
Revenue Recognition	Revenue Recognition - Pursuant to GAAP applicable to the insurance industry, revenues are recognized as follows: Substantially all General Insurance premiums pertain to annual policies and are reflected in income on a pro-rata basis in association with the related loss and loss adjustment expenses. Earned but unbilled premiums are generally taken into income on the billing date, while adjustments for retrospective premiums, commissions, and similar charges or credits are accrued on the basis of periodic evaluations of current underwriting experience and contractual obligations. Title premium and fee revenues stemming from the Company's direct operations (which include branch offices of its title insurers and wholly-owned agency subsidiaries) represent 21.0% of 2023, 19.5% of 2022, and 22.0% of 2021 consolidated title business revenues. Such premiums are generally recognized as income at the transaction closing date which approximates the policy effective date. Fee income related to escrow and other closing services is recognized when the related services have been performed and completed. The remaining title premium and fee revenues are produced by independent title agents. Rather than making estimates that could be subject to significant variance from actual premium and fee production, the Company recognizes revenues from those sources upon receipt. Such receipts can result in a three to four month lag relative to the effective date of the underlying title policy and are offset concurrently by production expenses and loss reserve provisions. The Company's mortgage guaranty premiums primarily stem from monthly installments paid on long-duration, guaranteed renewable insurance policies. Such premiums are written and earned in the month coverage is effective. With respect to relatively few annual or single premium policies, earned premiums are largely recognized on a pro-rata basis over the terms of the policies. The Company recognized total contract revenue from customers of $215.9, $210.1, and $210.2 during 2023, 2022, and 2021, respectively. Of these amounts, approximately $145.1, $132.8, and $127.0, respectively, were generated from claims handling and related ancillary services (i.e. risk control services) provided to customers within the Company’s General Insurance segment. Claims handling revenues are recognized on a straight-line basis over the contract period (generally one year) which is commensurate with the entity’s efforts relative to claims adjudication. The related ancillary services revenues are recognized as services are provided and invoiced to the customer. Additionally, revenues from contracts with customers generated from the Company’s Title Insurance segment, consisting primarily of software licensing arrangements and electronic recording services, totaled $62.5, $69.2, and $75.6 for the years ended December 31, 2023, 2022, and 2021, respectively. Such revenues are generally recognized at a point in time upon completion and invoicing of the services, or in the case of software maintenance agreements, on a straight-line basis over the life of the contract (generally one year).
Deferred Policy Acquisition Costs	Deferred Policy Acquisition Costs - Various insurance subsidiaries of the Company defer direct costs related to the successful production of business. Deferred costs consist principally of commissions, premium taxes, and policy issuance expenses. With respect to most coverages, deferred policy acquisition costs are amortized on the same basis as the related premiums are earned. To the extent that future revenues on existing policies are not adequate to cover related costs and expenses, deferred policy acquisition costs are charged to earnings. The Company considers investment income when evaluating the recoverability of deferred policy acquisition costs.
Assets Held-for-Sale	Assets Held-for-Sale - The Company classifies a business as held-for-sale when management has approved or received approval to sell the business, the sale is probable to occur during the next 12 months at a price that is reasonable in relation to its current estimated fair value, and certain other specific criteria are met. The business classified as held-for-sale is measured at the lower of the carrying value or estimated fair value, less costs to sell. If the carrying value of the business exceeds its estimated fair value, less costs to sell, a loss is recognized and reported in net investment gains (losses). Assets and liabilities related to the business classified as held-for-sale are separately reported in the Company's consolidated balance sheet in the period in which the business is classified as held-for-sale. See Note 2 for further discussion.
Loss and Loss Adjustment Expense Reserves	Loss and Loss Adjustment Expense Reserves - The establishment of loss reserves by the Company's insurance subsidiaries is a reasonably complex and dynamic process influenced by a large variety of factors. These factors principally include past experience applicable to the anticipated costs of various types of claims, continually evolving and changing legal theories emanating from the judicial system, recurring accounting, statistical, and actuarial studies, the professional experience and expertise of the Company's claim departments' personnel or attorneys and independent claim adjusters, ongoing changes in claim frequency or severity patterns such as those caused by natural disasters, illnesses, accidents, work‑related injuries, and changes in general and industry-specific economic conditions. Consequently, the reserves established are a reflection of: the opinions of a large number of persons; the application and interpretation of historical precedent and trends; expectations as to future developments; and management's judgment in interpreting all such factors. At any point in time, the Company is exposed to the possibility of higher or lower than anticipated loss costs due to all of these factors, and to the evolution, interpretation, and expansion of tort law, as well as the effects of unexpected jury verdicts. All reserves are therefore based on estimates which are periodically reviewed and evaluated in the light of emerging loss experience and changing circumstances. The resulting changes in estimates are recorded in operations of the periods during which they are made. Return and additional premiums and policyholders' dividends, all of which tend to be affected by development of losses in future years, may offset, in whole or in part, favorable or unfavorable loss developments for certain coverages such as workers' compensation, portions of which are written under loss sensitive programs that provide for such adjustments. Management believes that its overall reserving practices have been consistently applied over many years, and that its aggregate net reserves have generally resulted in reasonable approximations of the ultimate net costs of losses incurred. However, no representation is made nor is any guaranty given that ultimate net losses and related costs will not develop in future years to be significantly greater or lower than currently established reserve estimates. General Insurance reserves are established to provide for the ultimate expected cost of settling unpaid losses and claims reported at each balance sheet date. Such reserves are based on continually evolving assessments of the facts available to the Company during the settlement process which may stretch over long periods of time. Losses and claims incurred but not reported (IBNR), as well as expenses required to settle losses and claims, are established on the basis of a large number of formulas that take into account various criteria, including historical cost experience and anticipated costs of servicing reinsured and other risks. As applicable, estimates of possible recoveries from salvage or subrogation opportunities are considered in the establishment of such reserves. Overall loss and loss adjustment expense reserves incorporate amounts covering net estimates of unusual claims such as those emanating from asbestosis and environmental (A&E) exposures. Such reserves can affect claim costs and related loss ratios for such insurance coverages as general liability, commercial auto, workers' compensation, and property. Title Insurance and related escrow services loss and loss adjustment expense reserves are established as point estimates to cover the projected settlement costs of known as well as IBNR losses related to premium and escrow service revenues of each reporting period. Reserves for known claims are based on an assessment of the facts available to the Company during the settlement process. The point estimates covering all loss reserves take into account IBNR claims based on past experience and evaluations of such variables as changes in trends in the types of policies issued, real estate markets and interest rate environments, and levels of loan refinancing, all of which can have a bearing on the emergence, number, and ultimate cost of claims. RFIG Run-off mortgage guaranty insurance reserves for unpaid loss and loss adjustment expenses are recognized only upon an instance of default, defined as an insured mortgage loan for which two or more consecutive monthly payments have been missed. Loss reserves are based on statistical calculations that take into account the number of reported insured mortgage loan defaults as of each balance sheet date, as well as experience-based estimates of loan defaults that have occurred but have not as yet been reported. Further, the loss reserve estimating process takes into account a large number of variables including trends in claim severity, expected cure rates for reported loan delinquencies at various stages of default, the level of coverage rescissions and claims denials due to material misrepresentation in key underwriting information or non-compliance with prescribed underwriting guidelines, and management judgments relative to future employment levels, housing market activity, and mortgage loan interest costs, demand, and extensions. The Company has the legal right to rescind mortgage insurance coverage unilaterally as expressly stated in its policy. Moreover, two federal courts that have considered that policy wording have each affirmed that right. According to the policy, if any of those representations are materially false or misleading with respect to a loan, the Company has the right to cancel or rescind coverage for that loan retroactively to commencement of the coverage. In recent years, the incidence of rescissions has been immaterial. In addition to the above reserve elements, the Company establishes reserves for loss settlement costs that are not directly related to individual claims. Such reserves are based on prior years' cost experience and trends, and are intended to cover the unallocated costs of claim departments' administration of known and IBNR claims.
Reinsurance	Reinsurance - The cost of reinsurance is recognized over the terms of the reinsurance contracts. Amounts recoverable from reinsurers for loss and loss adjustment expenses are estimated in a manner consistent with the claim liability associated with the reinsured business. The Company evaluates the financial condition of its reinsurers on a regular basis and allowances are established for estimated credit losses. See Note 10 for further discussion.
Income Taxes	Income Taxes - The Company and most of its subsidiaries file a consolidated tax return and provide for income taxes payable currently. Deferred income taxes included in the accompanying consolidated financial statements will not necessarily become payable or recoverable in the future. The Company uses the asset and liability method of calculating deferred income taxes. This method results in the establishment of deferred tax assets and liabilities, calculated at currently enacted tax rates that are applied to the cumulative temporary differences between the financial statement and tax bases of assets and liabilities.
Property And Equipment	Property and Equipment - Property and equipment is generally depreciated or amortized over the estimated useful lives of the assets (two to 27 years), substantially by the straight-line method. Depreciation and amortization expenses related to property and equipment were $33.0, $28.3, and $27.2 in 2023, 2022, and 2021, respectively. Expenditures for maintenance and repairs are charged to income as incurred, and expenditures for major renewals and additions are capitalized as appropriate.
Title Plants and Records	Title Plants and Records - Title plants and records are carried at original cost or appraised value at the date of purchase. Such values represent the cost of producing or acquiring interests in title records and indexes and the appraised value of purchased subsidiaries' title records and indexes at dates of acquisition. The cost of maintaining, updating, and operating title records is charged to income as incurred. Title records and indexes are ordinarily not amortized unless events or circumstances indicate that the carrying amount of the capitalized costs may not be recoverable.
Goodwill and Intangible Assets	Goodwill and Intangible Assets - Goodwill resulting from business combinations is not amortizable against operations but must be tested annually for possible impairment of its continued value. Intangible assets with definitive lives are amortized against future operating results; whereas indefinite-lived intangibles are tested annually for impairment. Annual testing did not result in any impairment charges for the periods presented, and reporting units with goodwill balances had estimated fair values in excess of their carrying values. The Company's consolidated goodwill balance of $178.3 and $178.1 as of December 31, 2023 and 2022, respectively, is included as part of other assets in the consolidated balance sheets. No significant changes to goodwill balances occurred in either period.
Employee Benefit Plans	Employee Benefit Plans - The Company has a closed pension plan (the Plan) for certain employees under which benefits were frozen as of December 31, 2013. The Plan is a defined benefit plan pursuant to which pension payments are based primarily on years of service and employee compensation near retirement. As a result, eligible employees retain all of the vested rights as of the effective date of the freeze. While additional benefits no longer accrue, the Company's cumulative obligation continues to be subject to further adjustment due to changes in actuarial assumptions such as expected mortality, and changes in interest rates. The funded status of a pension plan is measured as of December 31 of each year as the difference between the fair value of plan assets and the projected benefit obligation. The funded status of the Plan is recognized as a net pension asset or liability, as applicable, with offsetting entries reflected as a component of shareholders' equity in accumulated other comprehensive income, net of deferred taxes. The Company also provides long-term incentive awards to certain employees under the 2022 Incentive Compensation Plan which was approved in May 2022. Stock options granted under this plan are valued using the Black-Scholes-Merton option pricing model and restricted stock awards are valued based on the closing market price at the grant date. The awards are generally expensed on a straight-line basis over the vesting period.
Escrow Funds	Escrow Funds - Segregated cash deposit accounts and the offsetting liabilities for escrow deposits in connection with Title Insurance real estate transactions in the same amounts ($1,817.1 and $2,022.7 at December 31, 2023 and 2022, respectively) are not included as assets or liabilities in the accompanying consolidated balance sheets as the escrow funds are not available for regular operations.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Consolidation, Subsidiary, Effects of Changes	. The following table reflects a summary of all such adjustments: Shareholders' Equity Net Income December 31, Years Ended December 31, 2023 2022 2023 2022 2021 Statutory totals of insurance company subsidiaries: General Insurance $ 4,607.8 $ 4,763.4 $ 594.3 $ 549.2 $ 496.8 Title Insurance 673.9 742.7 152.3 224.9 285.7 RFIG Run-off 131.1 141.8 9.8 70.5 27.3 Life and Accident 56.6 57.4 5.2 5.0 3.6 Subtotal 5,469.4 5,705.3 761.6 849.6 813.4 GAAP totals of non-insurance company subsidiaries and consolidation adjustments 1,058.6 1,023.7 (77.2) 11.3 177.0 Unadjusted totals 6,527.9 6,729.0 684.3 860.8 990.4 Adjustments to conform to GAAP statements: Deferred policy acquisition costs 286.7 252.9 34.9 26.3 9.4 Investment adjustments (102.6) (537.6) (109.1) (252.4) 606.6 Nonadmitted assets 207.3 173.9 — — — Deferred income taxes (95.1) 4.0 26.2 35.4 (135.3) Mortgage contingency reserves 38.4 127.7 — — — Title insurance premium reserves 733.7 777.5 (43.7) 42.5 109.4 Loss and loss adjustment expenses (535.8) (548.8) 17.1 (25.2) (48.7) Surplus notes (696.5) (844.5) — — — Other adjustments 46.4 38.9 (11.2) (0.7) 2.4 Total adjustments (117.5) (556.2) (85.7) (174.4) 543.6 Consolidated GAAP totals $ 6,410.7 $ 6,173.2 $ 598.6 $ 686.4 $ 1,534.3 __________ The insurance laws of the respective states in which the Company’s insurance subsidiaries are incorporated prescribe minimum capital and surplus requirements for the lines of business they are licensed to write. For domestic property and casualty and life and accident insurance companies the National Association of Insurance Commissioners also prescribes risk-based capital (RBC) requirements. RBC is a measure of statutory capital in relationship to a formula-driven definition of risk relative to a company’s balance sheet and mix of business. The combined RBC ratio of the primary General Insurance subsidiaries was 609% and 654% of the company action level RBC at December 31, 2023 and 2022, respectively. The minimum capital requirements for the Company’s Title Insurance subsidiaries are established by statute in the respective states of domicile. The minimum regulatory capital requirements are not significant in relationship to the recorded statutory capital of the Company’s Title and Life and Accident insurance subsidiaries. At December 31, 2023 and 2022 each of the Company’s General, Title, RFIG Run-off, and Life and Accident insurance subsidiaries exceeded the minimum statutory capital and surplus requirements.

Discontinued Operations and D_2

Discontinued Operations and Disposal Groups (Tables)	12 Months Ended
	Dec. 31, 2023
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations	December 31, 2023 Assets: Investments: Fixed income securities (at fair value) $ 29.8 Short-term investments (at fair value which approximates cost) 191.3 Total investments 221.2 Cash 0.8 Accrued investment income 0.9 Accounts and notes receivable 0.5 Federal income tax recoverable: Current 2.2 Deferred 0.2 Other assets (a) (31.1) Total assets $ 194.8 Liabilities: Policy liabilities: Loss and loss adjustment expense reserves $ 54.9 Unearned premiums 0.1 Total policy liabilities 55.0 Commissions, expenses, fees, and taxes 1.2 Other liabilities 0.5 Total liabilities $ 56.8 _________ (a) Other assets is presented net of a valuation allowance of $34.5 recorded upon remeasurement of the disposal group to fair value.

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Estimated Fair Values Of Fixed Maturities	Amortized Gross Gross Estimated Fixed Income Securities by Type: December 31, 2023: Government & Agency $ 1,920.3 $ 3.2 $ 64.6 $ 1,858.9 Municipal 774.5 0.2 7.1 767.6 Corporate 9,568.1 135.5 190.3 9,513.3 $ 12,263.0 $ 139.0 $ 262.0 $ 12,139.9 December 31, 2022: Government & Agency $ 2,300.0 $ — $ 114.8 $ 2,185.2 Municipal 896.9 0.1 15.5 881.5 Corporate 9,139.3 20.3 479.6 8,680.0 $ 12,336.3 $ 20.5 $ 610.1 $ 11,746.7
Amortized Cost and Estimated Fair Values Of Fixed Maturities By Contractual Maturities	Amortized Estimated Fixed Income Securities Stratified by Contractual Maturity at December 31, 2023: Due in one year or less $ 1,604.0 $ 1,587.7 Due after one year through five years 6,119.3 5,999.4 Due after five years through ten years 4,455.6 4,467.7 Due after ten years 83.9 84.9 $ 12,263.0 $ 12,139.9
Gross Unrealized Losses and Fair Value, Aggregated	Less than 12 Months 12 Months or Greater Total Fair Unrealized Losses Fair Unrealized Losses Fair Unrealized Losses December 31, 2023: Fixed Income Securities: Government & Agency $ 461.0 $ 2.7 $ 1,179.3 $ 61.8 $ 1,640.4 $ 64.6 Municipal 173.1 0.8 554.7 6.2 727.9 7.1 Corporate 853.3 8.2 4,270.9 182.0 5,124.3 190.3 $ 1,487.6 $ 11.8 $ 6,005.1 $ 250.2 $ 7,492.7 $ 262.0 December 31, 2022: Fixed Income Securities: Government & Agency $ 1,769.6 $ 71.0 $ 403.8 $ 43.8 $ 2,173.4 $ 114.8 Municipal 845.6 13.0 9.8 2.5 855.5 15.5 Corporate 6,796.7 355.0 1,043.7 124.6 7,840.4 479.6 $ 9,412.0 $ 439.1 $ 1,457.4 $ 170.9 $ 10,869.5 $ 610.1
Equity Securities Reflecting Reported Adjusted Cost	Equity Securities Cost Gross Gross Estimated December 31, 2023 $ 1,511.9 $ 1,164.7 $ 15.7 $ 2,660.8 December 31, 2022 $ 1,948.1 $ 1,291.5 $ 18.6 $ 3,220.9
Fair Value, Assets Measured on Recurring Basis	Fair Value Measurements As of December 31, 2023: Level 1 Level 2 Level 3 Total Fixed income securities: Government & Agency $ 1,379.8 $ 479.1 $ — $ 1,858.9 Municipal — 767.6 — 767.6 Corporate — 9,493.7 19.5 9,513.3 Short-term investments 1,032.6 — — 1,032.6 Equity securities $ 2,653.8 $ — $ 7.0 $ 2,660.8 As of December 31, 2022: Fixed income securities: Government & Agency $ 1,598.8 $ 586.3 $ — $ 2,185.2 Municipal — 881.5 — 881.5 Corporate — 8,659.2 20.8 8,680.0 Short-term investments 860.8 — — 860.8 Equity securities $ 3,219.1 $ — $ 1.7 $ 3,220.9
Investment Income	Years Ended December 31: 2023 2022 2021 Investment income from: Fixed income securities $ 438.8 $ 314.4 $ 280.6 Equity securities 92.1 132.5 157.5 Short-term investments 50.9 17.9 0.1 Other investments (a) 17.0 4.3 2.1 Gross investment income 598.9 469.3 440.4 Investment expenses (a) 20.6 9.7 6.1 Net investment income $ 578.3 $ 459.5 $ 434.3 Net investment gains (losses): Realized from actual transactions: Fixed income securities: Gains $ 1.2 $ 2.6 $ 3.4 Losses (181.9) (190.2) (1.9) Net (180.7) (187.6) 1.5 Equity securities: Gains 214.5 486.5 68.0 Losses (51.4) (111.9) (62.8) Net 163.0 374.5 5.1 Other investments, net 2.4 (1.2) 0.2 Total realized from actual transactions (15.2) 185.7 6.9 From impairments (b) (51.8) (123.5) — From unrealized changes in fair value of equity securities (123.9) (263.4) 751.1 Total realized and unrealized investment gains (losses) (190.9) (201.1) 758.0 Current and deferred income taxes (credits) (40.0) (42.5) 159.6 Net of tax realized and unrealized investment gains (losses) $ (150.8) $ (158.6) $ 598.4 Changes in unrealized investment gains (losses) reflected directly in shareholders' equity on: Fixed income securities $ 464.1 $ (824.7) $ (361.2) Less: Deferred income taxes (credits) 97.7 (174.1) (76.2) 366.3 (650.5) (284.9) Other investments 5.7 (8.5) (2.5) Less: Deferred income taxes (credits) 1.1 (1.8) (0.5) 4.5 (6.7) (2.0) Net changes in unrealized investment gains (losses), net of tax $ 370.8 $ (657.3) $ (287.0) _________ (a) Includes interest on funds held. (b) Includes expected loss on the pending sale of RMICC. See Note 2 for further discussion.

Deferred Policy Acquisition C_2

Deferred Policy Acquisition Cost (Tables)	12 Months Ended
	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Capitalization of Deferred Policy Acquisition Costs	Years Ended December 31: 2023 2022 2021 Deferred, beginning of year $ 382.5 $ 350.4 $ 328.0 Policy acquisition costs deferred: Commissions - net of reinsurance 495.0 423.3 340.9 Premium taxes 161.0 147.1 135.2 Salaries and other underwriting expenses 59.3 53.0 48.3 Subtotal 715.3 623.5 524.6 Amortization charged to income (680.1) (591.4) (502.2) Change for the year 35.2 32.0 22.4 Deferred, end of year $ 417.8 $ 382.5 $ 350.4

Losses, Claims and Settlement_2

Losses, Claims and Settlement Expenses (Tables)	12 Months Ended
	Dec. 31, 2023
Insurance [Abstract]
Schedule of Changes in Aggregate Reserves for the Company's Losses, Claims and Settlement Expenses	The following table shows changes in aggregate reserves for the Company's loss and loss adjustment expenses: Years Ended December 31: 2023 2022 2021 Gross reserves at beginning of year $ 12,221.5 $ 11,425.5 $ 10,671.0 Less: reinsurance losses recoverable 4,699.5 4,125.3 3,650.5 Net reserves at beginning of year: General Insurance 6,824.8 6,587.0 6,328.0 Title Insurance 612.8 594.2 556.1 RFIG Run-off 77.9 111.2 127.6 Other 6.3 7.6 8.6 Subtotal 7,521.9 7,300.2 7,020.4 Incurred loss and loss adjustment expenses: Provisions for insured events of the current year: General Insurance 2,770.7 2,545.1 2,418.3 Title Insurance 93.6 139.6 160.6 RFIG Run-off 13.7 17.5 19.3 Other 8.6 8.7 12.0 Subtotal 2,886.8 2,711.1 2,610.4 Change in provision for insured events of prior years: General Insurance (234.0) (193.1) (137.9) Title Insurance (44.9) (50.4) (47.6) RFIG Run-off (24.7) (35.1) (21.1) Other (2.1) (3.9) (3.9) Subtotal (305.8) (282.6) (210.6) Total incurred loss and loss adjustment expenses 2,581.0 2,428.4 2,399.7 Payments: Loss and loss adjustment expenses attributable to insured events of the current year: General Insurance 930.6 834.4 781.5 Title Insurance 14.4 13.1 21.4 RFIG Run-off — 0.2 0.2 Other 4.7 4.8 7.7 Subtotal 949.8 852.7 810.9 Loss and loss adjustment expenses attributable to insured events of prior years: General Insurance 1,475.6 1,279.8 1,239.8 Title Insurance 48.7 57.3 53.4 RFIG Run-off 11.9 15.5 14.3 Other 1.3 1.3 1.3 Subtotal 1,537.7 1,354.0 1,309.0 Total payments 2,487.6 2,206.7 2,120.0 RFIG Run-off reserves reclassified to liabilities held-for-sale (a) 54.9 — — Net reserves at end of year: General Insurance 6,955.2 6,824.8 6,587.0 Title Insurance 598.5 612.8 594.2 RFIG Run-off — 77.9 111.2 Other 6.6 6.3 7.6 Subtotal 7,560.4 7,521.9 7,300.2 Reinsurance losses recoverable 4,977.7 4,699.5 4,125.3 Gross reserves at end of year $ 12,538.2 $ 12,221.5 $ 11,425.5 _________ (a) RFIG Run-off reserves have been reclassified as held-for-sale as of December 31, 2023. See Note 2 for further discussion.
Schedule of Incurred and Paid Loss Development Tables for Major Types of Insurance Coverages	The following represents the Company's incurred and paid loss development tables for the major types of insurance coverages as of December 31, 2023. The information about incurred and paid claims development for the years ended December 31, 2014 to 2022 is presented as supplementary information. Workers' Compensation Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted) As of December 31, 2023 Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses Cumulative Number of Reported Losses* For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 780.9 $ 792.8 $ 786.4 $ 784.9 $ 777.0 $ 763.3 $ 724.4 $ 705.4 $ 685.8 $ 673.2 $ 58.8 54,174 2015 794.3 792.6 787.3 785.5 769.1 742.4 695.8 659.8 622.3 69.8 55,234 2016 756.1 752.9 745.7 730.5 712.6 692.8 624.2 584.9 95.5 52,495 2017 727.0 713.9 700.3 683.4 676.3 654.2 609.3 102.6 51,787 2018 698.6 691.5 681.0 665.9 644.8 605.4 141.3 52,390 2019 664.6 657.4 653.2 667.5 658.8 154.0 51,887 2020 560.9 569.4 571.7 574.7 144.7 45,859 2021 500.3 502.4 493.8 153.0 46,975 2022 488.1 487.4 184.7 46,691 2023 491.7 276.1 35,679 Total $ 5,802.1 (A) * Reported losses are accumulated on an individual claimant basis and exclude external reinsurance assumed and participation in residual market pools as claim frequency information is not available. Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 116.9 $ 293.7 $ 397.1 $ 466.0 $ 499.5 $ 524.8 $ 544.9 $ 554.6 $ 561.0 $ 567.9 2015 109.0 274.9 379.3 435.1 466.7 484.7 499.8 507.3 512.7 2016 102.5 253.5 334.4 383.5 408.4 425.2 435.8 442.5 2017 99.6 244.6 334.8 383.1 414.3 444.1 453.5 2018 94.8 240.6 320.5 367.2 396.8 416.0 2019 102.9 239.8 329.6 382.3 412.2 2020 84.3 211.6 284.3 329.7 2021 80.1 187.8 252.9 2022 74.2 188.2 2023 75.5 Total $ 3,651.7 (B) Net incurred loss and allocated loss adjustment expenses (A) $ 5,802.1 Less: net paid loss and allocated loss adjustment expenses (B) 3,651.7 Subtotal 2,150.3 All outstanding liabilities before 2014, net of reinsurance 754.9 Liabilities for loss and allocated loss adjustment expenses, net of reinsurance $ 2,905.3 General Liability Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted) As of December 31, 2023 Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses Cumulative Number of Reported Losses* For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 107.0 $ 110.4 $ 109.4 $ 111.0 $ 117.0 $ 117.1 $ 112.3 $ 112.8 $ 115.6 $ 117.9 $ 10.7 6,047 2015 96.0 96.3 99.2 102.3 104.8 105.8 99.8 99.2 99.0 12.1 5,616 2016 92.4 96.7 98.8 100.3 101.0 104.4 98.8 95.9 13.2 83,293 2017 111.2 121.4 129.6 132.8 135.2 138.0 143.9 18.2 460,523 2018 120.5 119.7 125.1 135.5 141.9 152.0 32.0 462,021 2019 133.5 131.9 138.7 146.0 146.9 39.5 375,990 2020 112.4 111.7 114.9 116.1 50.0 6,112 2021 94.2 92.7 99.0 44.3 6,022 2022 97.8 100.7 49.4 5,758 2023 132.6 98.5 12,208 $ 1,204.4 (A) * Reported losses are accumulated on an individual claimant basis and exclude external reinsurance assumed and participation in residual market pools as loss frequency information is not available. The increases beginning in 2016 are due to the addition of a national account with higher frequency yet lower severity than the existing book of business for accident years 2016 through 2019. Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 5.8 $ 15.8 $ 32.0 $ 52.8 $ 73.5 $ 82.8 $ 88.9 $ 94.9 $ 98.9 $ 103.0 2015 6.3 16.0 29.5 47.4 64.5 70.7 75.0 79.9 82.5 2016 7.1 18.5 34.8 47.7 58.0 66.9 71.9 75.1 2017 5.7 25.9 50.1 76.9 95.5 105.3 113.2 2018 6.9 28.8 48.9 71.0 91.0 102.0 2019 6.4 29.5 53.4 72.1 87.8 2020 4.2 12.4 28.5 45.0 2021 5.6 14.7 30.9 2022 6.4 22.2 2023 3.9 $ 665.9 (B) Net incurred loss and allocated loss adjustment expenses (A) $ 1,204.4 Less: net paid loss and allocated loss adjustment expenses (B) 665.9 Subtotal 538.4 All outstanding liabilities before 2014, net of reinsurance 167.0 Liabilities for loss and allocated loss adjustment expenses, net of reinsurance $ 705.5 Commercial Auto Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted) As of December 31, 2023 Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses Cumulative Number of Reported Losses* For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 687.8 $ 689.2 $ 691.7 $ 688.0 $ 688.6 $ 687.8 $ 683.8 $ 683.0 $ 682.1 $ 679.2 $ 5.9 103,242 2015 712.4 710.5 729.7 721.4 720.7 703.4 700.6 699.9 699.5 2.2 104,829 2016 755.9 768.9 786.0 780.8 779.3 762.1 754.9 752.9 4.3 110,766 2017 788.7 819.1 869.2 874.4 867.9 847.1 843.0 6.7 117,639 2018 883.2 947.9 989.9 992.1 976.1 971.3 20.1 129,290 2019 931.1 959.7 954.8 947.4 942.0 25.0 138,735 2020 941.1 913.7 854.0 845.5 70.6 117,927 2021 989.4 954.6 935.3 83.9 125,608 2022 1,074.2 1,044.5 123.6 125,309 2023 1,204.1 100.9 107,783 $ 8,917.7 (A) * Reported losses are accumulated on an individual claimant basis and exclude external reinsurance assumed and participation in residual market pools as claim frequency information is not available. Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance For the Years Ended December 31, Accident Supplementary Information (Unaudited) Year 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2014 $ 267.4 $ 430.5 $ 536.9 $ 605.4 $ 640.3 $ 664.9 $ 658.4 $ 664.3 $ 669.9 $ 672.2 2015 265.1 438.9 541.8 626.2 669.7 680.6 687.3 693.0 695.4 2016 290.2 469.6 585.1 677.8 710.8 725.5 737.3 742.7 2017 307.9 512.0 657.1 746.5 791.2 814.1 826.9 2018 330.0 557.5 730.4 836.7 900.0 924.1 2019 330.4 549.0 681.6 787.2 875.3 2020 290.1 464.3 602.2 692.7 2021 302.7 508.6 662.9 2022 354.8 606.8 2023 424.4 $ 7,123.8 (B) Net incurred loss and allocated loss adjustment expenses (A) $ 8,917.7 Less: net paid loss and allocated loss adjustment expenses (B) 7,123.8 Subtotal 1,793.9 All outstanding liabilities before 2014, net of reinsurance 14.5 Liabilities for loss and allocated loss adjustment expenses, net of reinsurance $ 1,808.4
Reconciliation of Incurred and Paid Loss Development Tables to Total Claim and Loss Adjustment Expense Reserves	The following represents a reconciliation of the incurred and paid loss development tables to total loss and loss adjustment expense reserves as reported in the consolidated balance sheets. December 31, 2023 2022 Net loss and allocated loss adjustment expense reserves: Workers' compensation (a) $ 2,725.3 $ 2,879.6 General liability 705.5 641.9 Commercial auto 1,808.4 1,747.3 Other short-duration insurance coverages 1,412.5 1,260.0 Subtotal 6,651.9 6,529.0 Reinsurance recoverable on loss reserves: Workers' compensation 1,998.2 1,975.5 General liability 813.2 785.3 Commercial auto 1,684.4 1,486.6 Other short-duration insurance coverages 477.7 447.7 Subtotal 4,973.6 4,695.3 Insurance coverages other than short-duration (b) 566.4 656.6 Unallocated loss adjustment expense reserves (c) 346.1 340.5 912.6 997.1 Gross loss and loss adjustment expense reserves $ 12,538.2 $ 12,221.5 __________ (a) Certain long-term disability type workers' compensation reserves are discounted to present value based on interest rates typically ranging from 3.0% to 3.5%. The amount of discount reflected in the year-end net reserves totaled $179.9 and $184.7 as of December 31, 2023 and 2022, respectively. Interest accretion of $25.6, $9.6, and $42.0 for the years ended December 31, 2023, 2022, and 2021, respectively, was recognized as unfavorable development of prior year reserves within loss and loss adjustment expenses in the consolidated statements of income. (b) RFIG Run-off loss reserves of $53.6 have been classified as held-for-sale as of December 31, 2023. See Note 2 for further discussion. (c) RFIG Run-off unallocated loss adjustment expense reserves of $1.2 have been classified as held-for-sale as of December 31, 2023. See Note 2 for further discussion.
Historical Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance	The table below is supplementary information and presents the historical average annual percentage payout of incurred losses by age, net of reinsurance. Supplementary Information (Unaudited) Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Workers' compensation 16.2 % 23.9 % 14.2 % 8.4 % 4.8 % 3.5 % 2.2 % 1.3 % 0.9 % 1.0 % General liability 5.1 % 11.8 % 15.1 % 15.6 % 13.7 % 7.5 % 5.1 % 4.4 % 3.0 % 3.4 % Commercial auto 35.7 % 23.4 % 16.0 % 11.1 % 6.1 % 2.5 % 0.8 % 0.8 % 0.6 % 0.3 %

Reinsurance and Retention Lim_2

Reinsurance and Retention Limits (Tables)	12 Months Ended
	Dec. 31, 2023
Reinsurance and Retention Limits [Abstract]
Reinsurance Ceded and Other Related Data	Years Ended December 31: 2023 2022 2021 General Insurance Written premiums: Direct $ 6,776.4 $ 6,263.3 $ 5,691.3 Assumed 96.6 90.0 74.0 Ceded $ 2,516.7 $ 2,375.1 $ 2,084.4 Earned premiums: Direct $ 6,513.2 $ 6,021.0 $ 5,509.1 Assumed 94.7 87.1 73.7 Ceded $ 2,488.6 $ 2,299.5 $ 2,027.3 Losses ceded $ 1,795.9 $ 1,677.3 $ 1,255.6

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The provision for combined current and deferred income taxes (credits) reflected in the consolidated statements of income may not bear the usual relationship to income before income taxes (credits) as the result of permanent and other differences between pretax income or loss and taxable income or loss determined under existing tax regulations. The more significant differences, their effect on the statutory income tax rate (credit), and the resulting effective income tax rates (credits) are summarized below: Years Ended December 31: 2023 2022 2021 Statutory tax rate 21.0 % 21.0 % 21.0 % Tax rate increases (decreases): Tax-exempt interest (0.4) (0.3) (0.2) Dividends received exclusion (1.0) (1.3) (0.7) Meals and entertainment 0.3 0.2 0.1 Other items - net — 0.3 — Effective tax rate 19.9 % 19.9 % 20.2 %
Schedule of Deferred Tax Assets and Liabilities	The tax effects of temporary differences that give rise to significant portions of the Company's net deferred tax assets (liabilities) are as follows at the dates shown: December 31: 2023 2022 2021 Deferred Tax Assets: Loss and loss adjustment expense reserves $ 214.9 $ 218.6 $ 214.2 Pension and deferred compensation plans 23.8 22.6 42.4 Realized loss from pending sale of mortgage insurance business 9.5 — — Net operating loss carryforward 5.5 7.6 9.6 AMT credit carryforward 9.0 9.0 9.0 Operating leases 46.4 46.7 49.7 Other temporary differences 16.3 17.1 12.3 Total deferred tax assets 325.4 321.6 337.5 Deferred Tax Liabilities: Unearned premium reserves 46.3 63.3 61.0 Deferred policy acquisition costs 82.8 76.0 68.5 Amortization of fixed income securities 14.6 6.8 5.2 Net unrealized investment gains 214.4 141.3 372.6 Title plants and records 2.8 2.8 2.8 Tax reform transition adjustment on loss and loss adjustment expense reserves 6.7 10.3 13.8 Operating leases 40.9 41.9 45.8 Other temporary differences 22.5 20.1 17.2 Total deferred tax liabilities 431.0 362.5 586.9 Net deferred tax liabilities (a) $ (105.6) $ (40.9) $ (249.5) __________ (a) RFIG Run-off deferred tax assets of $0.3 and deferred tax liabilities of $0.1 have been reclassified as held-for-sale as of December 31, 2023. See Note 2 for further discussion.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Compensation Related Costs [Abstract]
Schedule of Accumulated and Projected Benefit Obligations	The funded status of the Company's pension plan is reflected below. Years Ended December 31: 2023 2022 2021 Projected benefit obligation at beginning of year $ 452.8 $ 604.6 $ 639.7 Increases (decreases) during the year attributable to: Interest cost 23.4 16.4 15.2 Actuarial (gains) losses 10.9 (138.7) (22.2) Benefits paid (30.7) (29.5) (28.0) Net increase (decrease) for the year 3.6 (151.8) (35.1) Projected benefit obligation at end of year $ 456.4 $ 452.8 $ 604.6
Schedule of Changes in Fair Value of Plan Assets	Years Ended December 31: 2023 2022 2021 Fair value of net assets available for plan benefits At beginning of the year $ 507.1 $ 556.0 $ 479.6 Increases (decreases) during the year attributable to: Actual return on plan assets 44.2 (19.2) 104.4 Benefits paid (30.7) (29.5) (28.0) Net increase (decrease) for year 13.4 (48.8) 76.3 Fair value of net assets available for plan benefits At end of the year $ 520.6 $ 507.1 $ 556.0
Schedule of Net Funded Status [Table Text Block]	Funded status $ 64.1 $ 54.3 $ (48.6) Amounts recognized in accumulated other comprehensive income $ (27.8) $ (38.5) $ (123.2)
Schedule of Assumptions Used	The projected benefit obligation and net periodic benefit cost for the Plan were determined using the following weighted-average assumptions: Projected Benefit Obligation Net Periodic Benefit Cost As of December 31: 2023 2022 2023 2022 2021 Settlement discount rates 5.15 % 5.40 % 5.40 % 2.80 % 2.45 % Long-term rates of return on plan assets N/A N/A 4.60 % 7.00 % 7.00 %
Schedule of Weighted Average Asset Allocations Of Benefit Plans	The weighted-average asset allocations of the Plan were as follows: Current Investment Policy Asset Allocation % Range Target As of December 31: 2023 2022 Equity securities: Common shares of Company stock 16.0 % 13.5 % Other — 38.9 Subtotal 16.0 52.4 0% to 25% Fixed income securities 78.1 44.4 75% to 100% Other 5.9 3.2 1% to 10% Total 100.0 % 100.0 %
Schedule of Allocation of Plan Assets	The following tables present a summary of the Plan's assets segregated among the various input levels described in Note 3. Fair Value Measurements As of December 31, 2023: Level 1 Level 2 Level 3 Total Equity securities: Company stock $ 83.1 $ — $ — $ 83.1 Fixed income securities 3.7 402.7 — 406.5 Other 17.0 — 7.3 24.3 Total at fair value $ 103.9 $ 402.7 $ 7.3 514.0 Securities at net asset value 6.5 Total $ 520.6 As of December 31, 2022: Equity securities: Common shares of Company stock $ 68.3 $ — $ — $ 68.3 Other 197.5 — — 197.5 Subtotal 265.8 — — 265.8 Fixed income securities — 225.0 — 225.0 Other 7.1 — 5.9 13.0 Total at fair value $ 273.0 $ 225.0 $ 5.9 504.0 Securities at net asset value 3.1 Total $ 507.1
Schedule of Expected Benefit Payments	The following table presents a summary of the benefits expected to be paid as of December 31, 2023 for the next 10 years: 2024 2025 2026 2027 2028 2029 and after December 31, 2023 $ 33.7 $ 34.3 $ 34.9 $ 34.6 $ 34.6 $ 169.4
Schedule of Stock Based Compensation and Tax Benefit	Years Ended December 31: 2023 2022 2021 Stock-based compensation expense $ 19.5 $ 9.0 $ 3.2 Income tax benefit $ 4.1 $ 1.8 $ 0.6
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The following table presents the key assumptions used to value the option awards granted during the periods presented. Expected volatilities are based on the historical experience of Old Republic's common stock. The expected term of stock options represents the period of time that stock options granted are assumed to be outstanding. The Company uses historical data to estimate the effect of stock option exercise and employee departure behavior; groups of employees that have similar historical behavior are considered separately for valuation purposes. The risk-free rate of return for periods within the contractual term of the share option is based on the U.S. Treasury rate in effect at the time of the grant. 2023 2022 2021 Expected volatility 0.23 0.22 0.20 Expected dividends 4.66 % 4.32 % 4.76 % Expected term (in years) 6 6 7 Risk-free rate 3.69 % 2.68 % 1.21 %
Schedule of Share-based Compensation, Stock Options, Activity	A summary of stock option activity under the 2022 and 2016 Incentive Plans as of December 31, 2023, 2022, and 2021, and changes in outstanding options during the years then ended is presented below: As of and for the Years Ended December 31, 2023 2022 2021 Shares Weighted Shares Weighted Shares Weighted Outstanding at beginning of year 9,619,004 $ 20.68 8,344,470 $ 19.57 9,494,651 $ 18.36 Granted 2,990,000 25.22 2,660,000 23.28 2,216,250 21.30 Exercised 1,694,106 19.49 1,285,783 18.94 3,259,273 17.28 Forfeited and expired 44,684 22.04 99,683 19.78 107,158 18.32 Outstanding at end of year 10,870,214 22.10 9,619,004 20.68 8,344,470 19.57 Exercisable at end of year 4,790,571 $ 20.31 4,562,063 $ 19.53 4,652,951 $ 19.22 Weighted average fair value of options granted during the year (a) $ 3.76 per share $ 3.31 per share $ 1.86 per share __________ (a) Based on the Black-Scholes-Merton option pricing model and the assumptions outlined above.
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding	A summary of stock options outstanding and exercisable at December 31, 2023 follows: Options Outstanding Options Exercisable Weighted Average Weighted Exercise Prices Year of Grant Number Remaining Exercise Number $16.06 2014 74,788 0.25 $ 16.06 74,788 $ 16.06 $15.26 2015 123,061 1.25 15.26 123,061 15.26 $18.14 2016 252,893 2.25 18.14 252,893 18.14 $19.98 2017 407,633 3.25 19.98 407,633 19.98 $20.98 2018 573,174 4.25 20.98 573,174 20.98 $21.12 to $21.99 2019 973,628 5.25 21.16 973,628 21.16 $16.17 to $22.72 2020 1,295,913 6.25 17.45 878,634 17.50 $21.30 2021 1,761,193 7.25 21.30 829,759 21.30 $22.92 to $24.49 2022 2,429,431 8.25 23.30 677,001 23.33 $24.31 to $25.52 2023 2,978,500 9.25 25.22 — — Total 10,870,214 $ 22.10 4,790,571 $ 20.31
Schedule of Cash Proceeds Received from Share-based Payment Awards	The cash received from stock option exercises, the total intrinsic value of stock options exercised, and the actual tax benefit realized for the tax deductions from option exercises are as follows: 2023 2022 2021 Cash received from stock option exercise $ 33.0 $ 24.3 $ 56.3 Intrinsic value of stock options exercised 17.5 7.9 24.2 Actual tax benefit realized for tax deductions from stock options exercised $ 3.6 $ 1.6 $ 5.0
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity	A summary of restricted stock activity under the 2022 Incentive Plan as of December 31, 2023 and 2022, and changes in outstanding restricted stock awards during the years then ended is presented below: As of and for the Year Ended December 31, 2023 2022 Weighted Weighted Average Average Grant Date Grant Date Shares Fair Value Shares Fair Value Nonvested at beginning of year 659,874 $ 23.70 33,539 $ 21.32 Granted 823,907 25.15 644,356 23.76 Vested (225,289) 23.60 (16,901) 21.20 Forfeited (1,376) 25.05 (1,120) 22.34 Nonvested at end of year 1,257,116 $ 24.67 659,874 $ 23.70
Schedule of Profit Sharing and Other Incentive Compensation Programs	The Company has a number of profit sharing and other incentive compensation programs for the benefit of a substantial number of its employees. The costs related to such programs are summarized below: Years Ended December 31: 2023 2022 2021 ORI 401(k) Savings and Profit Sharing Plan $ 65.8 $ 77.8 $ 70.5 Cash, deferred and other incentive compensation $ 81.2 $ 70.3 $ 71.8

Net Income Per Share (Tables)

Net Income Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share	The following table provides a reconciliation of net income and the number of shares used in basic and diluted earnings per share calculations. Years Ended December 31: 2023 2022 2021 Numerator: Net Income $ 598.6 $ 686.4 $ 1,534.3 Denominator: Basic weighted-average shares (a) 282,732,526 301,676,941 301,945,319 Effect of dilutive securities - stock-based compensation awards 2,738,538 1,619,671 1,722,350 Diluted adjusted weighted-average shares (a) 285,471,064 303,296,612 303,667,669 Earnings per share: Basic $ 2.12 $ 2.28 $ 5.08 Diluted $ 2.10 $ 2.26 $ 5.05 Anti-dilutive common stock equivalents excluded from earnings per share computations: Stock-based compensation awards 2,234,500 2,645,750 — __________ (a) In calculating earnings per share, accounting standards require that common shares owned by the ORI 401(k) Savings and Profit Sharing Plan that are unallocated to participants in the plan be excluded from the calculation. Such shares are issued and outstanding and have the same voting and other rights applicable to all other common shares.

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of debt	Consolidated debt of Old Republic and its subsidiaries is summarized below: December 31: 2023 2022 Carrying Fair Carrying Fair 4.875% issued in 2014 and due 2024 $ 399.5 $ 397.0 $ 399.0 $ 397.5 3.875% issued in 2016 and due 2026 548.5 530.4 547.9 522.1 3.850% issued in 2021 and due 2051 643.1 472.7 642.9 449.1 Other miscellaneous debt — — 7.1 7.1 Total debt $ 1,591.2 $ 1,400.3 $ 1,597.0 $ 1,375.9
Fair Value, Debt Measured on Recurring Basis	The following table shows a summary of financial liabilities disclosed, but not carried, at fair value, segregated among the various input levels as described in Note 3: As of December 31: 2023 2022 Carrying Value $ 1,591.2 $ 1,597.0 Fair Value 1,400.3 1,375.9 Level 1 — — Level 2 1,400.3 1,368.7 Level 3 $ — $ 7.1

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Lessee, Operating Lease, Liability, Maturity	The following table presents a summary of future undiscounted lease payments as of the dates shown: As of December 31: 2023 2022 Year 1 $ 58.1 $ 58.8 Year 2 51.0 50.6 Year 3 38.1 42.7 Year 4 29.0 30.1 Year 5 22.0 21.4 Thereafter 82.1 79.3 Total 280.6 283.1 Discount 60.4 60.9 Lease Liability $ 220.2 $ 222.1

Consolidated Quarterly Result_2

Consolidated Quarterly Results - Unaudited (Tables)	12 Months Ended
	Dec. 31, 2023
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	In management's opinion, normal recurring adjustments necessary for a fair statement of quarterly results have been reflected in the information which follows. 1st 2nd 3rd 4th Year Ended December 31, 2023: Operating Summary: Net premiums, fees, and other income $ 1,594.6 $ 1,689.3 $ 1,801.1 $ 1,785.6 Net investment income and investment gains (losses) 164.0 108.9 (40.9) 155.4 Total revenues 1,758.7 1,798.3 1,760.1 1,941.1 Total expenses 1,509.5 1,601.4 1,696.2 1,703.6 Net income $ 199.8 $ 155.5 $ 52.6 $ 190.6 Net income per share: Basic $ 0.68 $ 0.55 $ 0.19 $ 0.70 Diluted $ 0.68 $ 0.54 $ 0.19 $ 0.69 Average shares outstanding: Basic 291,945,750 285,426,801 277,010,690 274,036,118 Diluted 293,993,474 287,882,787 279,924,410 277,226,628 1st 2nd 3rd 4th Year Ended December 31, 2022: Operating Summary: Net premiums, fees, and other income $ 1,955.2 $ 2,020.0 $ 1,983.1 $ 1,866.9 Net investment income and investment gains (losses) 251.3 (209.6) (262.0) 478.6 Total revenues 2,206.6 1,810.3 1,721.0 2,345.5 Total expenses 1,823.9 1,865.0 1,840.7 1,696.5 Net income (loss) $ 306.3 $ (40.1) $ (91.7) $ 512.1 Net income (loss) per share: Basic $ 1.01 $ (0.13) $ (0.31) $ 1.74 Diluted $ 1.00 $ (0.13) $ (0.31) $ 1.73 Average shares outstanding: Basic 303,582,578 303,793,432 303,652,802 294,290,072 Diluted 305,424,592 303,793,432 303,652,802 295,996,057

Information About Segments of_2

Information About Segments of Business (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of segment reporting	The accounting policies of the segments parallel those described in the summary of significant accounting policies pertinent thereto. The contributions of Old Republic's insurance industry segments to consolidated totals are shown in the following table. Segmented and Consolidated Results Years Ended December 31: 2023 2022 2021 General Insurance: Net premiums earned $ 4,119.2 $ 3,808.6 $ 3,555.5 Net investment income and other income 625.0 507.0 486.9 Total revenues excluding investment gains $ 4,744.3 $ 4,315.6 $ 4,042.5 Segment pretax operating income (a) $ 787.8 $ 689.8 $ 589.6 Title Insurance: Net premiums earned $ 2,300.9 $ 3,500.6 $ 3,960.5 Title, escrow and other fees 261.8 333.2 443.8 Subtotal 2,562.8 3,833.8 4,404.3 Net investment income and other income 57.8 48.8 44.9 Total revenues excluding investment gains $ 2,620.6 $ 3,882.7 $ 4,449.3 Segment pretax operating income (a) $ 133.5 $ 308.8 $ 515.7 RFIG Run-off Net premiums earned $ 16.4 $ 23.2 $ 32.6 Net investment income and other income 6.3 6.7 11.4 Total revenues excluding investment gains $ 22.7 $ 30.0 $ 44.1 Segment pretax operating income $ 21.2 $ 35.2 $ 32.8 Consolidated Revenues: Total revenues of Company segments $ 7,387.8 $ 8,228.3 $ 8,536.0 Corporate & Other (b) 208.0 195.5 166.6 Consolidated investment gains (losses): Realized from actual transactions and impairments (c) (67.0) 62.2 6.9 Unrealized from changes in fair value of equity securities (123.9) (263.4) 751.1 Total realized and unrealized investment gains (losses) (190.9) (201.1) 758.0 Consolidation elimination adjustments (146.5) (138.9) (119.0) Consolidated revenues $ 7,258.3 $ 8,083.7 $ 9,341.6 Consolidated Pretax Income: Total segment pretax operating income of Company segments $ 942.6 $ 1,033.9 $ 1,138.2 Corporate & Other (b) (4.2) 24.6 25.7 Consolidated investment gains (losses): Realized from actual transactions and impairments (c) (67.0) 62.2 6.9 Unrealized from changes in fair value of equity securities (123.9) (263.4) 751.1 Total realized and unrealized investment gains (losses) (190.9) (201.1) 758.0 Consolidated income before income taxes $ 747.4 $ 857.4 $ 1,922.1 December 31: 2023 2022 Consolidated Assets: General Insurance $ 22,710.5 $ 21,227.9 Title Insurance 1,948.2 2,077.6 RFIG Run-off (d) 232.8 344.2 Total assets of Company segments 24,891.7 23,649.9 Corporate & Other (b) 1,912.9 1,736.8 Consolidation elimination adjustments (303.2) (227.2) Consolidated assets $ 26,501.4 $ 25,159.4 __________ (a) Segment pretax operating income is reported net of interest charges on intercompany financing arrangements with Old Republic's holding company parent for the following segments: General - $76.5, $68.9, and $63.5 for the years ended December 31, 2023, 2022, and 2021, respectively; Title - $–, $0.8, and $1.9 for the years ended December 31, 2023, 2022, and 2022, respectively. (b) Includes amounts for a small life and accident insurance business as well as those of the parent holding company and its internal corporate services subsidiaries. (c) Includes an estimated pretax loss of $ 45.6 (d) At December 31, 2023, the Company classified its RFIG Run-off mortgage insurance business as held-for-sale in its consolidated balance sheet. See Note 2 for further discussion.	[1]
[1]Includes an estimated pretax loss of $ 45.6

Transactions with Affiliates (T

Transactions with Affiliates (Tables)	12 Months Ended
	Dec. 31, 2023
Transactions with Affiliates [Abstract]
Transactions with Affiliates	Assumed from Old Republic Ceded to Old Republic Years Ended December 31: 2023 2022 2021 2023 2022 2021 Premiums earned $ 0.7 $ 0.3 $ 1.5 $ — $ 0.1 $ 0.2 Commissions and fees 0.1 0.1 0.4 — — — Losses and loss expenses 2.9 0.9 1.1 — 0.1 0.5 Loss and loss expense reserves 4.3 7.1 8.5 1.4 2.7 3.1 Unearned premiums $ — $ — $ — $ — $ — $ —

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Accounting Principles (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Total Common Shareholders' Equity		$ 6,410.7				$ 6,173.2				$ 6,410.7	$ 6,173.2
Net Income		$ 190.6	$ 52.6	$ 155.5	$ 199.8	$ 512.1	$ (91.7)	$ (40.1)	$ 306.3	$ 598.6	$ 686.4	$ 1,534.3
General Insurance Segment [Member]
Risk based capital		609%				654%				609%	654%
Costs and Expenses [Member] | Significant Reconciling Items [Member]
Total statutory net income (loss)										$ 684.3	$ 860.8	990.4
Costs and Expenses [Member] | Deferred Policy Acquisition Costs [Member]
Statutory net income amount										34.9	26.3	9.4
Costs and Expenses [Member] | Investment adjustment [Member]
Statutory net income amount										(109.1)	(252.4)	606.6
Costs and Expenses [Member] | Non-admitted Assets [Member]
Statutory net income amount										0	0	0
Costs and Expenses [Member] | Deferred Income Taxes [Member]
Statutory net income amount										26.2	35.4	(135.3)
Costs and Expenses [Member] | Mortgage Contingency Reserves [Member]
Statutory net income amount										0	0	0
Costs and Expenses [Member] | Title insurance premium reserves [Member]
Statutory net income amount										(43.7)	42.5	109.4
Costs and Expenses [Member] | Losses, claims and settlement expenses [Member]
Statutory net income amount										17.1	(25.2)	(48.7)
Costs and Expenses [Member] | Surplus Notes [Member]
Statutory net income amount										0	0	0
Costs and Expenses [Member] | Sundry Adjustments [Member]
Statutory net income amount										(11.2)	(0.7)	2.4
Costs and Expenses [Member] | Adjustment to US-GAAP
Statutory net income amount										(85.7)	(174.4)	543.6
Stockholders Equity [Member] | Significant Reconciling Items [Member]
Total statutory capital		$ 6,527.9				$ 6,729				6,527.9	6,729
Stockholders Equity [Member] | Deferred Policy Acquisition Costs [Member]
Statutory capital and surplus, balance		286.7				252.9				286.7	252.9
Stockholders Equity [Member] | Investment adjustment [Member]
Statutory capital and surplus, balance		(102.6)				(537.6)				(102.6)	(537.6)
Stockholders Equity [Member] | Non-admitted Assets [Member]
Statutory capital and surplus, balance		207.3				173.9				207.3	173.9
Stockholders Equity [Member] | Deferred Income Taxes [Member]
Statutory capital and surplus, balance		(95.1)				4				(95.1)	4
Stockholders Equity [Member] | Mortgage Contingency Reserves [Member]
Statutory capital and surplus, balance		38.4				127.7				38.4	127.7
Stockholders Equity [Member] | Title insurance premium reserves [Member]
Statutory capital and surplus, balance		733.7				777.5				733.7	777.5
Stockholders Equity [Member] | Losses, claims and settlement expenses [Member]
Statutory capital and surplus, balance		(535.8)				(548.8)				(535.8)	(548.8)
Stockholders Equity [Member] | Surplus Notes [Member]
Statutory capital and surplus, balance		(696.5)				(844.5)				(696.5)	(844.5)
Stockholders Equity [Member] | Sundry Adjustments [Member]
Statutory capital and surplus, balance		46.4				38.9				46.4	38.9
Stockholders Equity [Member] | Adjustment to US-GAAP
Statutory capital and surplus, balance		(117.5)				(556.2)				(117.5)	(556.2)
Insurance Subsidiaries [Member] | Costs and Expenses [Member]
Total statutory net income (loss)	[1]									761.6	849.6	813.4
Insurance Subsidiaries [Member] | Costs and Expenses [Member] | General Insurance Segment [Member]
Total statutory net income (loss)	[1]									594.3	549.2	496.8
Insurance Subsidiaries [Member] | Costs and Expenses [Member] | Title Insurance Group [Member]
Total statutory net income (loss)	[1]									152.3	224.9	285.7
Insurance Subsidiaries [Member] | Costs and Expenses [Member] | RFIG Run-off [Member]
Total statutory net income (loss)	[1]									9.8	70.5	27.3
Insurance Subsidiaries [Member] | Costs and Expenses [Member] | Life & Accident Insurance [Member]
Total statutory net income (loss)	[1]									5.2	5	3.6
Insurance Subsidiaries [Member] | Stockholders Equity [Member]
Total statutory capital	[1]	5,469.4				5,705.3				5,469.4	5,705.3
Insurance Subsidiaries [Member] | Stockholders Equity [Member] | General Insurance Segment [Member]
Total statutory capital	[1]	4,607.8				4,763.4				4,607.8	4,763.4
Insurance Subsidiaries [Member] | Stockholders Equity [Member] | Title Insurance Group [Member]
Total statutory capital	[1]	673.9				742.7				673.9	742.7
Insurance Subsidiaries [Member] | Stockholders Equity [Member] | RFIG Run-off [Member]
Total statutory capital	[1]	131.1				141.8				131.1	141.8
Insurance Subsidiaries [Member] | Stockholders Equity [Member] | Life & Accident Insurance [Member]
Total statutory capital	[1]	56.6				57.4				56.6	57.4
NonInsurance Subsidiaries [Member] | Costs and Expenses [Member] | Significant Reconciling Items [Member]
Total statutory net income (loss)										(77.2)	11.3	$ 177
NonInsurance Subsidiaries [Member] | Stockholders Equity [Member] | Significant Reconciling Items [Member]
Total statutory capital		$ 1,058.6				$ 1,023.7				$ 1,058.6	$ 1,023.7
[1] The insurance laws of the respective states in which the Company’s insurance subsidiaries are incorporated prescribe minimum capital and surplus requirements for the lines of business they are licensed to write. For domestic property and casualty and life and accident insurance companies the National Association of Insurance Commissioners also prescribes risk-based capital (RBC) requirements. RBC is a measure of statutory capital in relationship to a formula-driven definition of risk relative to a company’s balance sheet and mix of business. The combined RBC ratio of the primary General Insurance subsidiaries was 609% and 654% of the company action level RBC at December 31, 2023 and 2022, respectively. The minimum capital requirements for the Company’s Title Insurance subsidiaries are established by statute in the respective states of domicile. The minimum regulatory capital requirements are not significant in relationship to the recorded statutory capital of the Company’s Title and Life and Accident insurance subsidiaries. At December 31, 2023 and 2022 each of the Company’s General, Title, RFIG Run-off, and Life and Accident insurance subsidiaries exceeded the minimum statutory capital and surplus requirements.

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Title Premium And Fee Revenues Stemming From Direct Operations	21%	19.50%	22%
Non-insurance Contract Revenue	$ 215.9	$ 210.1	$ 210.2
General Insurance Group [Member]
Contract Revenue - Claims Handling and Related Ancillary Services	145.1	132.8	127
Title Insurance Group [Member]
Non-insurance Contract Title Services	$ 62.5	$ 69.2	$ 75.6

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01	Dec. 31, 2023
General Insurance Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Title Insurance Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Summary of Significant Accoun_7

Summary of Significant Accounting Policies Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Depreciation	$ 33	$ 28.3	$ 27.2
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	27 years

Summary of Significant Accoun_8

Summary of Significant Accounting Policies Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 178.3	$ 178.1

Summary of Significant Accoun_9

Summary of Significant Accounting Policies Escrow Funds (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Restricted Cash and Cash Equivalents Items [Line Items]
Liabilties Related to Escrow	$ 1,817.1	$ 2,022.7
Title Insurance Group [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Escrow Deposit	$ 1,817.1	$ 2,022.7

Discontinued Operations and D_3

Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Available-for-sale Securities		$ 12,139.9	$ 11,746.7
Short-term investments		1,032.6	860.8
Total investments		15,867.7	15,859.9
Cash		202.8	81
Accrued investment income		117	106.7
Accounts and notes receivable		2,201.4	1,927.5
Federal income tax recoverable: Current		21.8	15.7
Total assets		26,501.4	25,159.4
Loss and loss adjustment expense reserves		12,538.2	12,221.5	$ 11,425.5	$ 10,671
Unearned premiums		3,042.7	2,787.8
Total policy liabilities		15,731.4	15,191.6
Commissions, expenses, fees, and taxes		533.8	514.8
Other liabilities		690.6	560.5
Total liabilities		20,090.7	$ 18,986.2
Disposal Group, Including Discontinued Operation, Consideration		140
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		45.6
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down		$ 34.5
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]		Consolidated revenues
Transactioncosts
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		$ 11
Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Available-for-sale Securities		29.8
Short-term investments		191.3
Total investments		221.2
Cash		0.8
Accrued investment income		0.9
Accounts and notes receivable		0.5
Federal income tax recoverable: Current		2.2
Deferred Income Tax Assets, Net		0.2
Other assets	[1]	(31.1)
Total assets		194.8
Loss and loss adjustment expense reserves		54.9
Unearned premiums		0.1
Total policy liabilities		55
Commissions, expenses, fees, and taxes		1.2
Other liabilities		0.5
Total liabilities		$ 56.8
[1]Other assets is presented net of a valuation allowance of $34.5 recorded upon remeasurement of the disposal group to fair value.

Investments (Details)

Investments (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss		$ 1.6		$ 0
Net Unrealized Gains Losses Recognized from Changes in Fair Value of Equity Securities Held		28.2		42.3	$ 711
Debt Securities, Available-for-sale, Amortized Cost		12,263
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		12,139.9		11,746.7
Debt Securities, Held-to-maturity, Fair Value		0		0
Fixed maturity securities, due in one year or less, amortized cost		1,604
Fixed maturity securities, due after one year through five years, amortized cost		6,119.3
Fixed maturity securities, due after five years through ten years, amortized cost		4,455.6
Fixed maturity securities, due after ten years, amortized cost		83.9
Fixed maturity securities, due in one year or less, estimated fair value		1,587.7
Fixed maturity securities, due after one year through five years, estimated fair value		5,999.4
Fixed maturity securities, due after five years through ten years, estimated fair value		4,467.7
Fixed maturity securities, due after ten years, estimated fair value		84.9
Bonds on deposit with Governmental Authorities		946
Equity Securities, FV-NI		2,660.8		3,220.9
Fixed maturity securities and equity, less than twelve months, fair value		1,487.6		9,412
Fixed maturity securities and equity, less than 12 months, unrealized losses		11.8		439.1
Fixed maturity securities and equity, 12 months or greater, fair value		6,005.1		1,457.4
Fixed maturity securities and equity, 12 months or greater, unrealized losses		250.2		170.9
Fixed maturity securities and equity, total, fair value		7,492.7		10,869.5
Unrealized from changes in fair value of equity securities		(123.9)		(263.4)	751.1
Gain (Loss) on Investments		(190.9)		(201.1)	758
Short-term investments		1,032.6		860.8
Gross investment income		598.9		469.3	440.4
Investment expenses	[1]	20.6		9.7	6.1
Net investment income		578.3		459.5	434.3
Realized gains on securities		1.2		2.6	3.4
Realized losses on securities		(181.9)		(190.2)	(1.9)
Net realized gains (losses)		(150.8)		(158.6)	598.4
OtherThanTemporaryImpairmentLossesCreditLossesOtherInvestmentsDebtSecutiriesRecognizedInEarnings		(6.2)		(123.5)
OtherThanTemporaryImpairmentLossesCreditLossesOtherInvestmentsDebtSecuritiesSaleOfSubsidiaryRecognizedInEarnings		(51.8)	[2]	(123.5)	0
Income taxes (credits)		(40)		(42.5)	159.6
Changes in unrealized investment gains (losses) on fixed maturity securities:		469.8		(833.3)	(363.8)
Deferred income taxes (credits)		98.9		(175.9)	(76.8)
Net unrealized gains (losses) on securities not included in the statements of income, net of tax		370.8		(657.3)	(287)
Total Common Shareholders' Equity		6,410.7		6,173.2
Debt Securities, Available-for-sale, Realized Gain (Loss)		(180.7)		(187.6)	1.5
Realized Investment Gains Losses From Sales		(15.2)		185.7	6.9
Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income		438.8		314.4	280.6
Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income		92.1		132.5	157.5
Short-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income		50.9		17.9	0.1
Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	[1]	17		4.3	2.1
Fixed Maturity Securities, U S Canadian Governments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		1,920.3		2,300
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		1,858.9		2,185.2
Fixed maturity securities and equity, less than twelve months, fair value		461		1,769.6
Fixed maturity securities and equity, less than 12 months, unrealized losses		2.7		71
Fixed maturity securities and equity, 12 months or greater, fair value		1,179.3		403.8
Fixed maturity securities and equity, 12 months or greater, unrealized losses		61.8		43.8
Fixed maturity securities and equity, total, fair value		1,640.4		2,173.4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		3.2		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		64.6		114.8
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		774.5		896.9
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		767.6		881.5
Fixed maturity securities and equity, less than twelve months, fair value		173.1		845.6
Fixed maturity securities and equity, less than 12 months, unrealized losses		0.8		13
Fixed maturity securities and equity, 12 months or greater, fair value		554.7		9.8
Fixed maturity securities and equity, 12 months or greater, unrealized losses		6.2		2.5
Fixed maturity securities and equity, total, fair value		727.9		855.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		0.2		0.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		7.1		15.5
Corporate Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		9,568.1		9,139.3
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		9,513.3		8,680
Fixed maturity securities and equity, less than twelve months, fair value		853.3		6,796.7
Fixed maturity securities and equity, less than 12 months, unrealized losses		8.2		355
Fixed maturity securities and equity, 12 months or greater, fair value		4,270.9		1,043.7
Fixed maturity securities and equity, 12 months or greater, unrealized losses		182		124.6
Fixed maturity securities and equity, total, fair value		5,124.3		7,840.4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		135.5		20.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		190.3		479.6
Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		12,263		12,336.3
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		12,139.9		11,746.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		139		20.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		262		610.1
Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Equity securities, adjusted cost		1,511.9		1,948.1
Equity securities, gross unrealized gains		(1,164.7)		(1,291.5)
Equity securities, gross unrealized losses		(15.7)		(18.6)
Equity Securities, FV-NI, Current		2,660.8		3,220.9
Fair Value, Inputs, Level 1 [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term investments		1,032.6		860.8
Fair Value, Inputs, Level 1 [Member] | Fixed Maturity Securities, U S Canadian Governments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		1,379.8		1,598.8
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		0		0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		0		0
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Equity Securities, FV-NI, Current		2,653.8		3,219.1
Fair Value, Inputs, Level 2 [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term investments		0		0
Fair Value, Inputs, Level 2 [Member] | Fixed Maturity Securities, U S Canadian Governments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		479.1		586.3
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		767.6		881.5
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		9,493.7		8,659.2
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Equity Securities, FV-NI, Current		0		0
Fair Value, Inputs, Level 3 [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Short-term investments		0		0
Fair Value, Inputs, Level 3 [Member] | Fixed Maturity Securities, U S Canadian Governments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		0		0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		0		0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)		19.5		20.8
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Equity Securities, FV-NI, Current		7		1.7
Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Available-for-sale And Trading Securities, Gross Realized Gains		214.5		486.5	68
Available-for-sale And Trading Securities, Gross Realized Losses		(51.4)		(111.9)	(62.8)
Available-for-sale And Trading Securities, Net Realized Gains (Losses)		163		374.5	5.1
Other long-term investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Changes in unrealized investment gains (losses) on fixed maturity securities:		5.7		(8.5)	(2.5)
Deferred income taxes (credits)		1.1		(1.8)	(0.5)
Net changes in unrealized investment gains (losses)		4.5		(6.7)	(2)
Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Changes in unrealized investment gains (losses) on fixed maturity securities:		464.1		(824.7)	(361.2)
Deferred income taxes (credits)		97.7		(174.1)	(76.2)
Net changes in unrealized investment gains (losses)		366.3		(650.5)	(284.9)
Other investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment gains (losses) - other long-term investments		$ 2.4		$ (1.2)	$ 0.2
[1]Includes interest on funds held.[2]Includes expected loss on the pending sale of RMICC. See Note 2 for further discussion.

Deferred Policy Acquisition C_3

Deferred Policy Acquisition Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Deferred beginning of year	$ 382.5	$ 350.4	$ 328
Acquisition costs deferred; additions	715.3	623.5	524.6
Amortization charged to income	(680.1)	(591.4)	(502.2)
Change for the year	35.2	32	22.4
Deferred end of year	417.8	382.5	350.4
Commissions, net of reinsurance [Member]
Business Acquisition [Line Items]
Acquisition costs deferred; additions	495	423.3	340.9
Premium taxes [Member]
Business Acquisition [Line Items]
Acquisition costs deferred; additions	161	147.1	135.2
Salaries and other marketing expenses [Member]
Business Acquisition [Line Items]
Acquisition costs deferred; additions	$ 59.3	$ 53	$ 48.3

Losses, Claims and Settlement_3

Losses, Claims and Settlement Expenses - General (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Supplementary Insurance Information, by Segment
Short-Duration Insurance Contract, Discounted Liability, Discount	$ 179,900,000	$ 184,700,000
Interest Accretion Amount	25,600,000	9,600,000	$ 42,000,000
General liability insurance face amount	10,000,000
Retention payable	500,000
Losses, claims, and settlement expenses, gross	130,600,000	121,300,000
Losses, claims, and settlement expenses	$ 87,500,000	$ 84,000,000
Average five year survival ratio, gross	6 years 7 months 6 days	6 years 4 months 24 days
Average five year survival ratio, net	7 years 4 months 24 days	7 years 7 months 6 days
5 Year average A&E reserves to ORGIG reserves	0.60%
Minimum [Member]
Supplementary Insurance Information, by Segment
Workers' compensation discount, percent	3%
General liability insurance face amount	$ 1,000,000
Maximum [Member]
Supplementary Insurance Information, by Segment
Workers' compensation discount, percent	3.50%
General liability insurance face amount	$ 2,000,000

Losses, Claims and Settlement_4

Losses, Claims and Settlement Expenses - Consolidated (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplementary Insurance Information, by Segment
Loss and loss adjustment expense reserves	$ 12,538.2		$ 12,221.5	$ 11,425.5	$ 10,671
Reinsurance Recoverables	4,977.7		4,699.5	4,125.3	3,650.5
Liability for Unpaid Claims and Claims Adjustment Expense, Net			7,521.9	7,300.2	7,020.4
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	2,886.8		2,711.1	2,610.4
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(305.8)		(282.6)	(210.6)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	2,581		2,428.4	2,399.7
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	949.8		852.7	810.9
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	1,537.7		1,354	1,309
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, excluding the reclassification of Consumer Credit Indemnity coverage	2,487.6		2,206.7	2,120
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	$ 7,560.4		$ 7,521.9	$ 7,300.2
One year development of consolidated reserves	4.10%		3.90%	3%
Three year average annual development of consolidated reserves	3.60%
Disposal Group, Not Discontinued Operations
Supplementary Insurance Information, by Segment
Loss and loss adjustment expense reserves	$ 54.9
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	54.9	[1]	$ 0	$ 0
General Insurance Segment [Member]
Supplementary Insurance Information, by Segment
Liability for Unpaid Claims and Claims Adjustment Expense, Net			6,824.8	6,587	6,328
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	2,770.7		2,545.1	2,418.3
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(234)		(193.1)	(137.9)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	930.6		834.4	781.5
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	1,475.6		1,279.8	1,239.8
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	6,955.2		6,824.8	6,587
RFIG Run-off [Member]
Supplementary Insurance Information, by Segment
Liability for Unpaid Claims and Claims Adjustment Expense, Net			77.9	111.2	127.6
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	13.7		17.5	19.3
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(24.7)		(35.1)	(21.1)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	0		0.2	0.2
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	11.9		15.5	14.3
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	0		77.9	111.2
Title Insurance Group [Member]
Supplementary Insurance Information, by Segment
Liability for Unpaid Claims and Claims Adjustment Expense, Net			612.8	594.2	556.1
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	93.6		139.6	160.6
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(44.9)		(50.4)	(47.6)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	14.4		13.1	21.4
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	48.7		57.3	53.4
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	598.5		612.8	594.2
Corporate & Other [Member]
Supplementary Insurance Information, by Segment
Liability for Unpaid Claims and Claims Adjustment Expense, Net			6.3	7.6	$ 8.6
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	8.6		8.7	12
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(2.1)		(3.9)	(3.9)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	4.7		4.8	7.7
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	1.3		1.3	1.3
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	$ 6.6		$ 6.3	$ 7.6
[1]RFIG Run-off reserves have been reclassified as held-for-sale as of December 31, 2023. See Note 2 for further discussion.

Losses, Claims and Settlement_5

Losses, Claims and Settlement Expenses - Consolidated - Incurred and Paid Loss Development Tables (Details) $ in Millions	Dec. 31, 2023 USD ($) claim	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	$ 5,802.1
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	3,651.7
Subtotal	2,150.3
All outstanding liabilities before 2014, net of reinsurance	754.9
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance	2,905.3
General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	1,204.4
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	665.9
Subtotal	538.4
All outstanding liabilities before 2014, net of reinsurance	167
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance	705.5
Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	8,917.7
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	7,123.8
Subtotal	1,793.9
All outstanding liabilities before 2014, net of reinsurance	14.5
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance	1,808.4
Short-duration Insurance Contracts, Accident Year 2014 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	673.2	$ 685.8	$ 705.4	$ 724.4	$ 763.3	$ 777	$ 784.9	$ 786.4	$ 792.8	$ 780.9
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 58.8
Cumulative Number of Reported Losses* | claim	54,174
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 567.9	561	554.6	544.9	524.8	499.5	466	397.1	293.7	116.9
Short-duration Insurance Contracts, Accident Year 2014 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	117.9	115.6	112.8	112.3	117.1	117	111	109.4	110.4	107
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 10.7
Cumulative Number of Reported Losses* | claim	6,047
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 103	98.9	94.9	88.9	82.8	73.5	52.8	32	15.8	5.8
Short-duration Insurance Contracts, Accident Year 2014 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	679.2	682.1	683	683.8	687.8	688.6	688	691.7	689.2	687.8
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 5.9
Cumulative Number of Reported Losses* | claim	103,242
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 672.2	669.9	664.3	658.4	664.9	640.3	605.4	536.9	430.5	$ 267.4
Short-duration Insurance Contracts, Accident Year 2015 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	622.3	659.8	695.8	742.4	769.1	785.5	787.3	792.6	794.3
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 69.8
Cumulative Number of Reported Losses* | claim	55,234
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 512.7	507.3	499.8	484.7	466.7	435.1	379.3	274.9	109
Short-duration Insurance Contracts, Accident Year 2015 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	99	99.2	99.8	105.8	104.8	102.3	99.2	96.3	96
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 12.1
Cumulative Number of Reported Losses* | claim	5,616
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 82.5	79.9	75	70.7	64.5	47.4	29.5	16	6.3
Short-duration Insurance Contracts, Accident Year 2015 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	699.5	699.9	700.6	703.4	720.7	721.4	729.7	710.5	712.4
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 2.2
Cumulative Number of Reported Losses* | claim	104,829
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 695.4	693	687.3	680.6	669.7	626.2	541.8	438.9	$ 265.1
Short-duration Insurance Contracts, Accident Year 2016 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	584.9	624.2	692.8	712.6	730.5	745.7	752.9	756.1
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 95.5
Cumulative Number of Reported Losses* | claim	52,495
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 442.5	435.8	425.2	408.4	383.5	334.4	253.5	102.5
Short-duration Insurance Contracts, Accident Year 2016 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	95.9	98.8	104.4	101	100.3	98.8	96.7	92.4
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 13.2
Cumulative Number of Reported Losses* | claim	83,293
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 75.1	71.9	66.9	58	47.7	34.8	18.5	7.1
Short-duration Insurance Contracts, Accident Year 2016 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	752.9	754.9	762.1	779.3	780.8	786	768.9	755.9
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 4.3
Cumulative Number of Reported Losses* | claim	110,766
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 742.7	737.3	725.5	710.8	677.8	585.1	469.6	$ 290.2
Short-duration Insurance Contracts, Accident Year 2017 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	609.3	654.2	676.3	683.4	700.3	713.9	727
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 102.6
Cumulative Number of Reported Losses* | claim	51,787
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 453.5	444.1	414.3	383.1	334.8	244.6	99.6
Short-duration Insurance Contracts, Accident Year 2017 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	143.9	138	135.2	132.8	129.6	121.4	111.2
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 18.2
Cumulative Number of Reported Losses* | claim	460,523
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 113.2	105.3	95.5	76.9	50.1	25.9	5.7
Short-duration Insurance Contracts, Accident Year 2017 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	843	847.1	867.9	874.4	869.2	819.1	788.7
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 6.7
Cumulative Number of Reported Losses* | claim	117,639
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 826.9	814.1	791.2	746.5	657.1	512	$ 307.9
Short-duration Insurance Contracts, Accident Year 2018 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	605.4	644.8	665.9	681	691.5	698.6
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 141.3
Cumulative Number of Reported Losses* | claim	52,390
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 416	396.8	367.2	320.5	240.6	94.8
Short-duration Insurance Contracts, Accident Year 2018 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	152	141.9	135.5	125.1	119.7	120.5
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 32
Cumulative Number of Reported Losses* | claim	462,021
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 102	91	71	48.9	28.8	6.9
Short-duration Insurance Contracts, Accident Year 2018 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	971.3	976.1	992.1	989.9	947.9	883.2
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 20.1
Cumulative Number of Reported Losses* | claim	129,290
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 924.1	900	836.7	730.4	557.5	$ 330
Short-duration Insurance Contracts, Accident Year 2019 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	658.8	667.5	653.2	657.4	664.6
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 154
Cumulative Number of Reported Losses* | claim	51,887
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 412.2	382.3	329.6	239.8	102.9
Short-duration Insurance Contracts, Accident Year 2019 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	146.9	146	138.7	131.9	133.5
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 39.5
Cumulative Number of Reported Losses* | claim	375,990
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 87.8	72.1	53.4	29.5	6.4
Short-duration Insurance Contracts, Accident Year 2019 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	942	947.4	954.8	959.7	931.1
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 25
Cumulative Number of Reported Losses* | claim	138,735
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 875.3	787.2	681.6	549	$ 330.4
Short-duration Insurance Contracts, Accident Year 2020 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	574.7	571.7	569.4	560.9
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 144.7
Cumulative Number of Reported Losses* | claim	45,859
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 329.7	284.3	211.6	84.3
Short-duration Insurance Contracts, Accident Year 2020 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	116.1	114.9	111.7	112.4
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 50
Cumulative Number of Reported Losses* | claim	6,112
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 45	28.5	12.4	4.2
Short-duration Insurance Contracts, Accident Year 2020 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	845.5	854	913.7	941.1
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 70.6
Cumulative Number of Reported Losses* | claim	117,927
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 692.7	602.2	464.3	$ 290.1
Short-Duration Insurance Contract, Accident Year 2021 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	493.8	502.4	500.3
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 153
Cumulative Number of Reported Losses* | claim	46,975
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 252.9	187.8	80.1
Short-Duration Insurance Contract, Accident Year 2021 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	99	92.7	94.2
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 44.3
Cumulative Number of Reported Losses* | claim	6,022
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 30.9	14.7	5.6
Short-Duration Insurance Contract, Accident Year 2021 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	935.3	954.6	989.4
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 83.9
Cumulative Number of Reported Losses* | claim	125,608
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 662.9	508.6	$ 302.7
Short-Duration Insurance Contract, Accident Year 2022 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	487.4	488.1
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 184.7
Cumulative Number of Reported Losses* | claim	46,691
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 188.2	74.2
Short-Duration Insurance Contract, Accident Year 2022 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	100.7	97.8
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 49.4
Cumulative Number of Reported Losses* | claim	5,758
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 22.2	6.4
Short-Duration Insurance Contract, Accident Year 2022 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	1,044.5	1,074.2
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 123.6
Cumulative Number of Reported Losses* | claim	125,309
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 606.8	$ 354.8
Short-duration Insurance Contracts, Accident Year 2023 | Workers' Compensation [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	491.7
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 276.1
Cumulative Number of Reported Losses* | claim	35,679
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 75.5
Short-duration Insurance Contracts, Accident Year 2023 | General Liability [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	132.6
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 98.5
Cumulative Number of Reported Losses* | claim	12,208
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 3.9
Short-duration Insurance Contracts, Accident Year 2023 | Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Undiscounted)	1,204.1
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development on Reported Losses	$ 100.9
Cumulative Number of Reported Losses* | claim	107,783
Cumulative Paid Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 424.4

Losses, Claims and Settlement_6

Losses, Claims and Settlement Expenses - Consolidated - Reconciliation of Claims Development to Liability (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net claim and allocated loss adjustment expense reserves		$ 6,651.9	$ 6,529
Reinsurance recoverable on claim reserves		4,973.6	4,695.3
Insurance coverages other than short-duration (b)	[1]	566.4	656.6
Unallocated loss adjustment expense reserves (c)	[2]	346.1	340.5
Insurance lines other than short-duration and unallocated loss adjustment expense reserves		912.6	997.1
Loss and loss adjustment expense reserves		12,538.2	12,221.5	$ 11,425.5	$ 10,671
Interest Accretion Amount		25.6	9.6	$ 42
Short-Duration Insurance Contract, Discounted Liability, Discount		179.9	184.7
Disposal Group, Not Discontinued Operations
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Insurance coverages other than short-duration (b)		53.6
Unallocated loss adjustment expense reserves (c)		1.2
Loss and loss adjustment expense reserves		54.9
Workers' Compensation [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net claim and allocated loss adjustment expense reserves	[3]	2,725.3	2,879.6
Reinsurance recoverable on claim reserves		1,998.2	1,975.5
General Liability [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net claim and allocated loss adjustment expense reserves		705.5	641.9
Reinsurance recoverable on claim reserves		813.2	785.3
Commercial Automobile [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net claim and allocated loss adjustment expense reserves		1,808.4	1,747.3
Reinsurance recoverable on claim reserves		1,684.4	1,486.6
Other short-duration insurance lines [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net claim and allocated loss adjustment expense reserves		1,412.5	1,260
Reinsurance recoverable on claim reserves		$ 477.7	$ 447.7
[1]RFIG Run-off loss reserves of $53.6 have been classified as held-for-sale as of December 31, 2023. See Note 2 for further discussion.[2]RFIG Run-off unallocated loss adjustment expense reserves of $1.2 have been classified as held-for-sale as of December 31, 2023. See Note 2 for further discussion.[3]Certain long-term disability type workers' compensation reserves are discounted to present value based on interest rates typically ranging from 3.0% to 3.5%. The amount of discount reflected in the year-end net reserves totaled $179.9 and $184.7 as of December 31, 2023 and 2022, respectively. Interest accretion of $25.6, $9.6, and $42.0 for the years ended December 31, 2023, 2022, and 2021, respectively, was recognized as unfavorable development of prior year reserves within loss and loss adjustment expenses in the consolidated statements of income.

Losses, Claims and Settlement_7

Losses, Claims and Settlement Expenses - Consolidated - Historical Average Annual Payout of Incurred Claims (Details)	Dec. 31, 2023
Workers' compensation [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	16.20%
Year 2	23.90%
Year 3	14.20%
Year 4	8.40%
Year 5	4.80%
Year 6	3.50%
Year 7	2.20%
Year 8	1.30%
Year 9	0.90%
Year 10	1%
General liability [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	5.10%
Year 2	11.80%
Year 3	15.10%
Year 4	15.60%
Year 5	13.70%
Year 6	7.50%
Year 7	5.10%
Year 8	4.40%
Year 9	3%
Year 10	3.40%
Commercial automobile [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	35.70%
Year 2	23.40%
Year 3	16%
Year 4	11.10%
Year 5	6.10%
Year 6	2.50%
Year 7	0.80%
Year 8	0.80%
Year 9	0.60%
Year 10	0.30%

Reinsurance and Retention Lim_3

Reinsurance and Retention Limits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reinsurance Premiums for Insurance Companies, by Product Segment
Reinsurance Unrecoverable Amount	$ 0	$ 0
Direct Premiums Earned	8,846,400,000	9,563,300,000	$ 9,523,600,000
Assumed Premiums Earned	96,200,000	89,400,000	75,100,000
Ceded Premiums Earned	2,496,700,000	2,310,500,000	2,039,000,000
General Insurance Group [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Workers Compensation Insurance, Maximum Coverage Limit	5,200,000
Commercial Auto Liability Compensation Insurance, Maximum Coverage Limit	7,000,000
General Liabiltity Insurance, Maximum Coverage Limit	7,000,000
Executive Protection Insurance, Maximum Coverage Limit	12,800,000
Aviation Insurance, Maximum Coverage Limit	2,200,000
Property Coverages Insurance, Maximum Coverage Limit	23,100,000
Reinsurance Limits	195,000,000
Reinsurance Limits for Acts of Terrorism	5,000,000
Facultative reinsurance limit	$ 200,000,000
Reinsurance Recoverable, Concentration Risk Ten Largest Insurers, Percentage	59%
Reinsurance Recoverable, Concentration Risk Largest Insurer, Percentage	13.20%
Reinsurance Recoverable, Concentration Risk Ten Largest Insurers, Percentage of A Rating or Better	50.80%
Reinsurance Recoverable, Concentration Risk Ten Largest Insurers, Percentage From Foreign Unrated Companies	26.80%
Reinsurance Recoverable, Concentration Risk Ten Largest Insurers, Percentage From Domestic Unrated Companies	22.40%
Direct Premiums Written	$ 6,776,400,000	6,263,300,000	5,691,300,000
Assumed Premiums Written	96,600,000	90,000,000	74,000,000
Ceded Premiums Written	2,516,700,000	2,375,100,000	2,084,400,000
Direct Premiums Earned	6,513,200,000	6,021,000,000	5,509,100,000
Assumed Premiums Earned	94,700,000	87,100,000	73,700,000
Ceded Premiums Earned	2,488,600,000	2,299,500,000	2,027,300,000
Reinsurance Effect on Claims and Benefits Incurred, Amount Ceded	1,795,900,000	1,677,300,000	1,255,600,000
RFIG Run-off [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Average Direct Primary Mortgage Guaranty Exposure, Per Insured Loan	37,000
Direct Premiums Earned	16,400,000	23,200,000	32,600,000
Assumed Premiums Earned	0	0	0
Ceded Premiums Earned	0	0	0
Title Insurance Group [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Title Insurance Risk, Per Policy	500,000,000
Title Insurance Risk Exposure, Per Policy	1,000,000
Direct Premiums Earned	2,299,100,000	3,498,100,000	3,958,600,000
Assumed Premiums Earned	1,800,000	2,600,000	1,800,000
Ceded Premiums Earned	$ 0	$ 100,000	$ 0

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Effective Tax Rate Reconciliation [Line Items]
Statutory tax rate	21%		21%	21%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	(0.40%)		(0.30%)	(0.20%)
Dividends received exclusion	(1.00%)		(1.30%)	(0.70%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent	0.30%		0.20%	0.10%
Other items - net	0%		0.30%	0%
Effective tax rates (credit)	19.90%		19.90%	20.20%
Deferred Tax Assets [Abstract]
Deferred Tax Assets, losses, claims, and settlement expenses	$ 214.9		$ 218.6	$ 214.2
Deferred Tax Assets, Pension and deferred compensation plans	23.8		22.6	42.4
Deferred Tax Assets, Impairment losses on investments	9.5		0	0
Deferred Tax Assets, Net operating loss carryforward	5.5		7.6	9.6
Deferred Tax Assets, AMT credit carryforward	9		9	9
Deferred Tax Asset - Operating Lease Right of Use Asset	46.4		46.7	49.7
Deferred Tax Assets, Other temporary differences	16.3		17.1	12.3
Total deferred tax assets	325.4		321.6	337.5
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilties, Unearned premium reserves	46.3		63.3	61
Deferred Tax Liabilities, Deferred policy acquisition costs	82.8		76	68.5
Deferred Tax Liabilities, Amortization of fixed maturity securities	14.6		6.8	5.2
Deferred Tax Liabilities, Net unrealized investment gains	214.4		141.3	372.6
Deferred Tax Liabilities, Title plants and records	2.8		2.8	2.8
Deferred tax Liabilities - TCJA Discounted reserves transition adjustment	6.7		10.3	13.8
Deferred Tax Liability - Operating Lease Liability	40.9		41.9	45.8
Deferred Tax Liabilities, Other temporary differences	22.5		20.1	17.2
Deferred Tax Liabilities, Gross	431		362.5	586.9
Deferred Tax Liabilities, Net	(105.6)	[1]	$ (40.9)	$ (249.5)
Operating loss carryforwards	26.4
Disposal Group, Not Discontinued Operations
Deferred Tax Assets [Abstract]
Total deferred tax assets	0.3
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities, Gross	0.1
Maximum [Member]
Deferred Tax Liabilities [Abstract]
Operating loss carryforwards	$ 9.8
[1]RFIG Run-off deferred tax assets of $0.3 and deferred tax liabilities of $0.1 have been reclassified as held-for-sale as of December 31, 2023. See Note 2 for further discussion

Employee Benefit Plans (Details

Employee Benefit Plans (Details) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2023 USD ($) plan $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2015 USD ($) shares
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Securities at Net Asset Value		$ 6.5	$ 3.1
ORI 401(k) Savings and Profit Sharing Plan, unallocated shares | shares		3,955,122
Employee savings and stock ownership plan, number of allocated shares | shares		19,362,130
Employee savings and stock ownership plan, number of allocated shares to employees | shares		15,407,008
stock acquired during period value employee stock ownership plan					$ 50	$ 50	$ 34
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		$ 504
Fair value of net assets available for plan benefits at end of year		514	504
Net pretax amount recognized		(10.8)	$ (86.6)	$ (101.9)
Estimated future cash contributions next year		$ 0
Share contractual period		10 years
Expected volatility		23%	22%	20%
Expected dividends		4.66%	4.32%	4.76%
Expected term (in years)		6 years	6 years	7 years
Risk-free rate		3.69%	2.68%	1.21%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of new common stock shares available under the 2020 Incentive Compensation Plan | shares		20,000,000
Maximum Number of Common Stock Shares Available Under 2016 Stock Option Plan | shares		4,700,000
Maximum number of common shares available under the 2022 Incentive Compensation Plan | shares		17,700,000
Share-based compensation expense		$ 19.5	$ 9	$ 3.2
Income tax benefit		$ 4.1	$ 1.8	$ 0.6
Award vesting rate, within one year of grant date		3 years
Award vesting rate, within one year of grant date		10%
Award vesting rate, between year one and year two		15%
Award vesting rate, between year two and year three		20%
Award vesting rate, between year three and year four		25%
Award vesting rate, between year four and year five		30%
Options, outstanding at beginning of year | shares		9,619,004	8,344,470	9,494,651
Granted | shares		2,990,000	2,660,000	2,216,250
Exercised | shares		1,694,106	1,285,783	3,259,273
Forfeited and canceled | shares		44,684	99,683	107,158
Options, outstanding at end of year | shares		10,870,214	9,619,004	8,344,470	9,494,651
Exercisable at end of year | shares		4,790,571	4,562,063	4,652,951
Granted, Weighted Average Exercise Price | $ / shares		$ 25.22	$ 23.28	$ 21.30
Exercised, Weighted Average Exercise Price | $ / shares		19.49	18.94	17.28
Forfeited and canceled, Weighted Average Exercise Price | $ / shares		22.04	19.78	18.32
Options, outstanding, weighted average exercise price | $ / shares		22.10	20.68	19.57	$ 18.36
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		20.31	19.53	19.22
Weighted average fair value of options granted during the year | $ / shares	[1]	$ 3.76	$ 3.31	$ 1.86
Total unrecognized compensation cost		$ 29.7
Unrecognized stock compensation costs, weighted average remaining contractual term		3 years
Cash received from stock option exercise		$ 33	$ 24.3	$ 56.3
Intrinsic value of stock options exercised		17.5	7.9	24.2
Actual tax benefit realized for tax deductions from stock options exercised		$ 3.6	$ 1.6	$ 5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares		1,257,116	659,874	33,539
Granted | shares		823,907	644,356
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | shares		(225,289)	(16,901)
Forfeited and canceled | shares		(1,376)	(1,120)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares		$ 24.67	$ 23.70	$ 21.32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares		25.15	23.76
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares		23.60	21.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares		$ 25.05	$ 22.34
Defined contribution plan, one-time cost		$ 10.7
Employees Savings and Stock Ownership Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined contribution plan, cost recognized		65.8	$ 77.8	$ 70.5
Cash and deferred incentive compensation [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined contribution plan, cost recognized		81.2	70.3	71.8
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		273
Fair value of net assets available for plan benefits at end of year		103.9	273
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		225
Fair value of net assets available for plan benefits at end of year		402.7	225
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		5.9
Fair value of net assets available for plan benefits at end of year		$ 7.3	5.9
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of benefit plans | plan		1
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year		$ 452.8	604.6	639.7
Interest cost		23.4	16.4	15.2
Actuarial (gains) losses		10.9	(138.7)	(22.2)
Benefits paid		(30.7)	(29.5)	(28)
Net increase (decrease) for the year		3.6	(151.8)	(35.1)
Projected benefit obligation at end of year		456.4	452.8	604.6	$ 639.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		507.1	556	479.6
Actual return on plan assets		44.2	(19.2)	104.4
Benefits paid		(30.7)	(29.5)	(28)
Net increase (decrease) for year		13.4	(48.8)	76.3
Fair value of net assets available for plan benefits at end of year		520.6	507.1	556	$ 479.6
Defined Benefit Plan, Funded (Unfunded) Status of Plan		64.1	54.3	(48.6)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		0.9	(18.3)	(9.8)
Net recognized loss		$ (27.8)	$ (38.5)	$ (123.2)
Settlement discount rates - Projected Benefit Obligation		5.15%	5.40%
Settlement discount rates - Net Periodic Benefit Costs		5.40%	2.80%	2.45%
Long-term rates of return on plans' assets		4.60%	7%	7%
Expected future benefit payments in year one		$ 33.7
Expected future benefit payments in year two		34.3
Expected future benefit payments in year three		34.9
Expected future benefit payments in year four		34.6
Expected future benefit payments in year five		34.6
Expected future benefit payments in five fiscal years thereafter		$ 169.4
Total investments		100%	100%
Pension Plans, Defined Benefit [Member] | Equity securities, other [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		$ 197.5
Fair value of net assets available for plan benefits at end of year			$ 197.5
Total investments		0%	38.90%
Pension Plans, Defined Benefit [Member] | Equity securities, other [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		$ 197.5
Fair value of net assets available for plan benefits at end of year			$ 197.5
Pension Plans, Defined Benefit [Member] | Equity securities, other [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		0
Fair value of net assets available for plan benefits at end of year			0
Pension Plans, Defined Benefit [Member] | Equity securities, other [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		0
Fair value of net assets available for plan benefits at end of year			0
Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		$ 265.8
Fair value of net assets available for plan benefits at end of year			$ 265.8
Total investments		16%	52.40%
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		$ 265.8
Fair value of net assets available for plan benefits at end of year			$ 265.8
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		0
Fair value of net assets available for plan benefits at end of year			0
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		0
Fair value of net assets available for plan benefits at end of year			0
Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		225
Fair value of net assets available for plan benefits at end of year		$ 406.5	$ 225
Total investments		78.10%	44.40%
Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		$ 0
Fair value of net assets available for plan benefits at end of year		3.7	$ 0
Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		225
Fair value of net assets available for plan benefits at end of year		402.7	225
Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		0
Fair value of net assets available for plan benefits at end of year		0	0
Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		13
Fair value of net assets available for plan benefits at end of year		$ 24.3	$ 13
Total investments		5.90%	3.20%
Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		$ 7.1
Fair value of net assets available for plan benefits at end of year		17	$ 7.1
Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		0
Fair value of net assets available for plan benefits at end of year		0	0
Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		5.9
Fair value of net assets available for plan benefits at end of year		7.3	5.9
Pension Plans, Defined Benefit [Member] | Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		68.3
Fair value of net assets available for plan benefits at end of year		$ 83.1	$ 68.3
Total investments		16%	13.50%
Pension Plans, Defined Benefit [Member] | Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		$ 68.3
Fair value of net assets available for plan benefits at end of year		83.1	$ 68.3
Pension Plans, Defined Benefit [Member] | Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		0
Fair value of net assets available for plan benefits at end of year		0	0
Pension Plans, Defined Benefit [Member] | Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of net assets available for plan benefits at beginning of year		0
Fair value of net assets available for plan benefits at end of year		$ 0	$ 0
Minimum [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Current Investment Policy Asset Allocation % Range Target		0%
Minimum [Member] | Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Current Investment Policy Asset Allocation % Range Target		75%
Minimum [Member] | Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Current Investment Policy Asset Allocation % Range Target		1%
Maximum [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Current Investment Policy Asset Allocation % Range Target		25%
Maximum [Member] | Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Current Investment Policy Asset Allocation % Range Target		100%
Maximum [Member] | Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Current Investment Policy Asset Allocation % Range Target		10%
Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
stock acquired during period shares employee stock ownership plan | shares					3,337,000	2,383,625	2,200,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted common stock vesting period		3 years
Range of Exercise Prices, $16.06[Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		74,788
Exercisable at end of year | shares		74,788
Options, outstanding, weighted average exercise price | $ / shares		$ 16.06
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 16.06
Options, Outstanding, Weighted Average Remaining Contractual Life		3 months
Range of Exercise Prices, $15.26 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		123,061
Exercisable at end of year | shares		123,061
Options, outstanding, weighted average exercise price | $ / shares		$ 15.26
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 15.26
Options, Outstanding, Weighted Average Remaining Contractual Life		1 year 3 months
Range of Exercise Prices, $18.14 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		252,893
Exercisable at end of year | shares		252,893
Options, outstanding, weighted average exercise price | $ / shares		$ 18.14
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 18.14
Options, Outstanding, Weighted Average Remaining Contractual Life		2 years 3 months
Range of Exercise Prices, $19.98 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		407,633
Exercisable at end of year | shares		407,633
Options, outstanding, weighted average exercise price | $ / shares		$ 19.98
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 19.98
Options, Outstanding, Weighted Average Remaining Contractual Life		3 years 3 months
Range of Exercise Prices, $20.98 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		573,174
Exercisable at end of year | shares		573,174
Options, outstanding, weighted average exercise price | $ / shares		$ 20.98
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 20.98
Options, Outstanding, Weighted Average Remaining Contractual Life		4 years 3 months
Range of Exercise Prices, $21.12 to $21.99 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		973,628
Exercisable at end of year | shares		973,628
Options, outstanding, weighted average exercise price | $ / shares		$ 21.16
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 21.16
Options, Outstanding, Weighted Average Remaining Contractual Life		5 years 3 months
Range of Exercise Prices, $16.17 to $22.72 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		1,295,913
Exercisable at end of year | shares		878,634
Options, outstanding, weighted average exercise price | $ / shares		$ 17.45
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 17.50
Options, Outstanding, Weighted Average Remaining Contractual Life		6 years 3 months
Range of Exercise Prices, $21.30 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		1,761,193
Exercisable at end of year | shares		829,759
Options, outstanding, weighted average exercise price | $ / shares		$ 21.30
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 21.30
Options, Outstanding, Weighted Average Remaining Contractual Life		7 years 3 months
Range of Exercise Prices, $22.92 to $24.49 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		2,429,431
Exercisable at end of year | shares		677,001
Options, outstanding, weighted average exercise price | $ / shares		$ 23.30
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 23.33
Options, Outstanding, Weighted Average Remaining Contractual Life		8 years 3 months
Range of Exercise Prices, $24.31 to $25.52 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, outstanding at end of year | shares		2,978,500
Exercisable at end of year | shares		0
Options, outstanding, weighted average exercise price | $ / shares		$ 25.22
Exercisable at end of year, Weighted Average Exercise Price | $ / shares		$ 0
Options, Outstanding, Weighted Average Remaining Contractual Life		9 years 3 months
[1]Based on the Black-Scholes-Merton option pricing model and the assumptions outlined above.

Net Income Per Share (Details)

Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 190.6	$ 52.6	$ 155.5	$ 199.8	$ 512.1	$ (91.7)	$ (40.1)	$ 306.3	$ 598.6	$ 686.4	$ 1,534.3
Weighted average number of shares outstanding, basic	274,036,118	277,010,690	285,426,801	291,945,750	294,290,072	303,652,802	303,793,432	303,582,578	282,732,526	301,676,941	301,945,319
Effect of dilutive securities - stock based compensation awards									2,738,538	1,619,671	1,722,350
Weighted Average Number of Shares Outstanding, Diluted	277,226,628	279,924,410	287,882,787	293,993,474	295,996,057	303,652,802	303,793,432	305,424,592	285,471,064	303,296,612	303,667,669
Net income per share: basic (in dollars per share)	$ 0.70	$ 0.19	$ 0.55	$ 0.68	$ 1.74	$ (0.31)	$ (0.13)	$ 1.01	$ 2.12	$ 2.28	$ 5.08
Earnings Per Share, Diluted (in dollars per share)	$ 0.69	$ 0.19	$ 0.54	$ 0.68	$ 1.73	$ (0.31)	$ (0.13)	$ 1	$ 2.10	$ 2.26	$ 5.05
Stockbased compensation awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dulitive common share equivalents excluded from earnings per share computations (in shares)									2,234,500	2,645,750	0

Credit Losses (Details)

Credit Losses (Details) - Accounting Standards Update 2016-13 - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Reinsurance Recoverable, Allowance for Credit Loss	$ 17.5	$ 16
Accounts Receivable, Allowance for Credit Loss	$ 26.1	$ 27

Debt (Details)

Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Fair value	$ 1,400.3	$ 1,375.9
Debt and Lease Obligation	1,591.2	1,597
Interest Expense, Debt	67.2	67.3	$ 55.9
Fair Value, Inputs, Level 3 [Member]
Debt Instrument [Line Items]
Debt and Lease Obligation	0	$ 7.1
Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400
Debt Instrument, Interest Rate, Stated Percentage	4.875%	4.875%
Fair value	$ 397	$ 397.5
Debt and Lease Obligation	$ 399.5	$ 399
Maturity date of debt	Oct. 01, 2024	Oct. 01, 2024
Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 550
Debt Instrument, Interest Rate, Stated Percentage	3.875%	3.875%
Fair value	$ 530.4	$ 522.1
Debt and Lease Obligation	$ 548.5	$ 547.9
Maturity date of debt	Aug. 26, 2026	Aug. 26, 2026
Senior Notes Due 2051
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 650
Debt Instrument, Interest Rate, Stated Percentage	3.85%	3.85%
Fair value	$ 472.7	$ 449.1
Debt and Lease Obligation	$ 643.1	$ 642.9
Maturity date of debt	Jun. 11, 2051	Jun. 11, 2051
Other Miscellaneous Debt [Member] [Domain]
Debt Instrument [Line Items]
Debt and Lease Obligation	$ 0	$ 7.1

Debt Debt Financial Liabilities

Debt Debt Financial Liabilities Disclosed, but not Carried, at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt and Lease Obligation	$ 1,591.2	$ 1,597
Fair value	1,400.3	1,375.9
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt and Lease Obligation	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt and Lease Obligation	1,400.3	1,368.7
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt and Lease Obligation	0	7.1
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt and Lease Obligation	$ 1,591.2	$ 1,597

Shareholders' Equity Preferred

Shareholders' Equity Preferred Stock (Details)	12 Months Ended
	Dec. 31, 2023 series vote $ / shares shares	Dec. 31, 2022 shares
Class of Stock
Preferred Stock, Shares Authorized	75,000,000	75,000,000
Preferred Stock, Shares Outstanding	0	0
Common Stock, Shares, Issued	0	0
Series A Preferred Stock [Member]
Class of Stock
Preferred Stock, Shares Authorized	10,000,000
Preferred Stock, Number of Designated Series | series	1
Preferred stock, dividend rate, per dollar-amount | $ / shares	$ 1
Multiple of Aggregate Share Amount	100
Preferred Stock Rights to Vote | vote	100

Shareholders' Equity Common Sto

Shareholders' Equity Common Stock (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Class of Stock
Common Stock, Voting Rights	1
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	278,392,263	296,932,316
Common Class B [Member]
Class of Stock
Common Stock, Voting Rights	0.1
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	0	0
Common Stock, shares outstanding	0	0

Shareholders' Equity Cash Divid

Shareholders' Equity Cash Dividend Restrictions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
C Cash Dividend Restrictions [Abstract]
Amount available for dividend distribution without prior approval from regulatory agency	$ 854.5
Extra-ordinary dividends received from subsidiaries	110	$ 140	$ 100
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries	$ 673.3	$ 614.6	$ 566.7

Shareholders' Equity Cash Div_2

Shareholders' Equity Cash Dividends (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity [Abstract]
Special dividend declared in August 2022 and paid in September 2022, amount per share	$ 1
Special dividend declared in August 2021 and paid on October 6, 2021		$ 1.50
Special dividend declared in December 2020 and paid on January 15, 2021			$ 1

Shareholders' Equity Common S_2

Shareholders' Equity Common Stock Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	2 Months Ended	12 Months Ended
	Feb. 20, 2024	Dec. 31, 2023
Subsequent Event
Class of Stock
Treasury Stock, Value, Acquired, Cost Method	$ 83.1
Treasury Stock, Shares, Acquired	2.9
Treasury Stock Acquired, Average Cost Per Share	$ 28.33
August 18, 2022 Authorization
Class of Stock
Stock Repurchase Program, Authorized Amount		$ 450
Treasury Stock, Value, Acquired, Cost Method		$ 168.7
Treasury Stock, Shares, Acquired		6.7
Treasury Stock Acquired, Average Cost Per Share		$ 25.13
May 12, 2023 Authorization
Class of Stock
Stock Repurchase Program, Authorized Amount		$ 450
Treasury Stock, Value, Acquired, Cost Method		$ 366.5
Treasury Stock, Shares, Acquired		14.2
Treasury Stock Acquired, Average Cost Per Share		$ 25.82

Leases (Details)

Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Operating Lease, Liability	$ 220.2	$ 222.1
Retained earnings	$ 5,644.3	$ 5,321.8
Operating Lease, Weighted Average Discount Rate, Percent	5.49%	5.27%
Operating Lease, Weighted Average Remaining Lease Term	6 years 10 months 24 days	7 years
Fixed lease payments	$ 60.6	$ 64	$ 65
Lessee, Operating Lease, Liability, to be Paid, Year One	58.1	58.8
Lessee, Operating Lease, Liability, Payments, Due Year Two	51	50.6
Lessee, Operating Lease, Liability, Payments, Due Year Three	38.1	42.7
Lessee, Operating Lease, Liability, Payments, Due Year Four	29	30.1
Lessee, Operating Lease, Liability, Payments, Due Year Five	22	21.4
Lessee, Operating Lease, Liability, Payments, Due after Year Five	82.1	79.3
Lessee, Operating Lease, Liability, Payments, Due	280.6	283.1
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	60.4	60.9
Rental expense for leased premises	$ 76.3	$ 76.2	$ 75.6
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Accounting Standards Update 2016-02 [Member]
Loss Contingencies [Line Items]
Operating Lease, Right-of-Use Asset	$ 194.4	$ 199.6

Consolidated Quarterly Result_3

Consolidated Quarterly Results - Unaudited (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]
Net premiums, fees, and other income	$ 1,785.6	$ 1,801.1	$ 1,689.3	$ 1,594.6	$ 1,866.9	$ 1,983.1	$ 2,020	$ 1,955.2
Net investment income and realized gains (losses)	155.4	(40.9)	108.9	164	478.6	(262)	(209.6)	251.3
Total revenues	1,941.1	1,760.1	1,798.3	1,758.7	2,345.5	1,721	1,810.3	2,206.6	$ 7,258.3	$ 8,083.7	$ 9,341.6
Total expenses	1,703.6	1,696.2	1,601.4	1,509.5	1,696.5	1,840.7	1,865	1,823.9	6,510.8	7,226.3	7,419.5
Net income	$ 190.6	$ 52.6	$ 155.5	$ 199.8	$ 512.1	$ (91.7)	$ (40.1)	$ 306.3	$ 598.6	$ 686.4	$ 1,534.3
Net income per share: basic (in dollars per share)	$ 0.70	$ 0.19	$ 0.55	$ 0.68	$ 1.74	$ (0.31)	$ (0.13)	$ 1.01	$ 2.12	$ 2.28	$ 5.08
Net income per share: diluted (in dollars per share)	$ 0.69	$ 0.19	$ 0.54	$ 0.68	$ 1.73	$ (0.31)	$ (0.13)	$ 1	$ 2.10	$ 2.26	$ 5.05
Weighted average number of shares outstanding, basic	274,036,118	277,010,690	285,426,801	291,945,750	294,290,072	303,652,802	303,793,432	303,582,578	282,732,526	301,676,941	301,945,319
Weighted Average Number of Shares Outstanding, Diluted	277,226,628	279,924,410	287,882,787	293,993,474	295,996,057	303,652,802	303,793,432	305,424,592	285,471,064	303,296,612	303,667,669

Information About Segments of_3

Information About Segments of Business (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Consolidated Revenues [Abstract]
Net premiums earned										$ 6,445.9	$ 7,342.1	$ 7,559.8
Title, escrow and other fees										261.8	333.2	443.8
Sub-total										6,707.7	7,675.3	8,003.6
Total operating revenues										7,449.3	8,284.9	8,583.5
Consolidated net realized investment gains (losses)										(67)	62.2	6.9
Consolidated revenues		$ 1,941.1	$ 1,760.1	$ 1,798.3	$ 1,758.7	$ 2,345.5	$ 1,721	$ 1,810.3	$ 2,206.6	7,258.3	8,083.7	9,341.6
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Consolidated net realized investment gains (losses)										(67)	62.2	6.9
Consolidated income (loss) before income taxes (credits)										747.4	857.4	1,922.1
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)										148.7	170.9	387.7
Income tax expense (credits) on consolidated net realized investment gains (losses)										(40)	(42.5)	159.6
Consolidated assets [Abstract]
Assets		26,501.4				25,159.4				26,501.4	25,159.4
Unrealized from changes in fair value of equity securities										(123.9)	(263.4)	751.1
Gain (Loss) on Investments										(190.9)	(201.1)	758
Unrealized from changes in fair value of equity securities										(123.9)	(263.4)	751.1
Corporate, Non-Segment
Consolidated Revenues [Abstract]
Consolidated revenues	[1]									208	195.5	166.6
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Consolidated income (loss) before income taxes (credits)	[1]									(4.2)	24.6	25.7
Consolidated assets [Abstract]
Assets	[1]	1,912.9				1,736.8				1,912.9	1,736.8
Consolidation elimination adjustments [Member]
Consolidated Revenues [Abstract]
Net premiums earned										0	0	0
Consolidated revenues										(146.5)	(138.9)	(119)
Consolidated assets [Abstract]
Assets		(303.2)				(227.2)				(303.2)	(227.2)
General Insurance Group [Member] | Operating Segments
Consolidated Revenues [Abstract]
Net premiums earned										4,119.2	3,808.6	3,555.5
Net investment income and other income										625	507	486.9
Total operating revenues										4,744.3	4,315.6	4,042.5
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses	[2]									787.8	689.8	589.6
Consolidated assets [Abstract]
Assets		22,710.5				21,227.9				22,710.5	21,227.9
Title Insurance Group [Member] | Operating Segments
Consolidated Revenues [Abstract]
Net premiums earned										2,300.9	3,500.6	3,960.5
Title, escrow and other fees										261.8	333.2	443.8
Sub-total										2,562.8	3,833.8	4,404.3
Net investment income and other income										57.8	48.8	44.9
Total operating revenues										2,620.6	3,882.7	4,449.3
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses	[2]									133.5	308.8	515.7
Consolidated assets [Abstract]
Assets		1,948.2				2,077.6				1,948.2	2,077.6
RFIG Run-off [Member] | Operating Segments
Consolidated Revenues [Abstract]
Net premiums earned										16.4	23.2	32.6
Net investment income and other income										6.3	6.7	11.4
Total operating revenues										22.7	30	44.1
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses										21.2	35.2	32.8
Consolidated assets [Abstract]
Assets	[3]	232.8				344.2				232.8	344.2
Total of major segments [Member] | Operating Segments
Consolidated Revenues [Abstract]
Consolidated revenues										7,387.8	8,228.3	8,536
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Consolidated income (loss) before income taxes (credits)										942.6	1,033.9	$ 1,138.2
Consolidated assets [Abstract]
Assets		$ 24,891.7				$ 23,649.9				$ 24,891.7	$ 23,649.9
[1]Includes amounts for a small life and accident insurance business as well as those of the parent holding company and its internal corporate services subsidiaries[2]Segment pretax operating income is reported net of interest charges on intercompany financing arrangements with Old Republic's holding company parent for the following segments: General - $76.5, $68.9, and $63.5 for the years ended December 31, 2023, 2022, and 2021, respectively; Title - $–, $0.8, and $1.9 for the years ended December 31, 2023, 2022, and 2022, respectively.[3]At December 31, 2023, the Company classified its RFIG Run-off mortgage insurance business as held-for-sale in its consolidated balance sheet. See Note 2 for further discussion.

Information About Segments of_4

Information About Segments of Business Textuals (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information
Number of major segments | segment	3
Net premiums earned	$ 6,445.9	$ 7,342.1	$ 7,559.8
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 45.6
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]	Consolidated revenues
General Insurance Group [Member]
Segment Reporting Information
Interest - other	$ 76.5	68.9	63.5
Title Insurance Group [Member]
Segment Reporting Information
Interest - other	$ 0	$ 0.8	$ 1.9
Commercial Automobile [Member]
Segment Reporting Information
Commercial auto net premiums earned	41%

Information About Segments of_5

Information About Segments of Business Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item
Assets	$ 26,501.4	$ 25,159.4
Consolidation elimination adjustments [Member]
Segment Reporting, Asset Reconciling Item
Assets	$ (303.2)	$ (227.2)

Transactions with Affiliates (D

Transactions with Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Transactions with Affiliates
Premiums earned, Assumed from Old Republic	$ 96.2	$ 89.4	$ 75.1
Premiums earned, Ceded to Old Republic	2,496.7	2,310.5	2,039
American Business & Mercantile Insurance Mutual [Member]
Transactions with Affiliates
Premiums earned, Assumed from Old Republic	0.7	0.3	1.5
Premiums earned, Ceded to Old Republic	0	0.1	0.2
Commission and fees, Assumed from Old Republic	0.1	0.1	0.4
Commissions and fees, Ceded to Old Republic	0	0	0
Losses and loss expenses, Assumed from Old Republic	2.9	0.9	1.1
Losses and loss expenses, Ceded to Old Republic	0	0.1	0.5
Loss and loss expense reserves, Assumed from Old Republic	4.3	7.1	8.5
Loss and loss expense reserves, Ceded to Old Republic	1.4	2.7	3.1
Unearned premiums, Assumed from Old Republic	0	0	0
Unearned premiums, Ceded to Old Republic	0	0	$ 0
Mutual's statutory capital included surplus notes due to Old Republic	10.5	10.5
Total statutory capital	$ 62.4	$ 58.8

Schedule I - Summary of Inves_2

Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Investment Owned, at Cost	[1]	$ 14,841.8
Investments		15,867.7	$ 15,859.9
Short-term Investments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	1,032.6
Amount at which shown in balance sheet		1,032.6
Other investments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	34.3
Amount at which shown in balance sheet		34.3
Fixed maturity securities [Member] | United States Government and government agencies and authorities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	1,695.3
Fair Value		1,641.5
Amount at which shown in balance sheet		1,641.5
Fixed maturity securities [Member] | States, municipalities and political subdivisions [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	774.5
Fair Value		767.6
Amount at which shown in balance sheet		767.6
Fixed maturity securities [Member] | Foreign government [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	224.9
Fair Value		217.3
Amount at which shown in balance sheet		217.3
Fixed maturity securities [Member] | Corporate, industrial and all other [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	9,568.1
Fair Value		9,513.3
Amount at which shown in balance sheet		9,513.3
Fixed maturity securities [Member] | Fixed Maturities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	12,263
Fair Value		12,139.9
Amount at which shown in balance sheet		12,139.9
Equity Securities [Member] | Non-redeemable preferred stock [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	5.6
Fair Value		6.2
Amount at which shown in balance sheet		6.2
Equity Securities [Member] | Banks, trust and insurance companies [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	79
Fair Value		163.7
Amount at which shown in balance sheet		163.7
Equity Securities [Member] | Industrial, miscellaneous, and all others [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	1,427.2
Fair Value		2,490.8
Amount at which shown in balance sheet		2,490.8
Equity Securities [Member] | Equity Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost	[1]	1,511.9
Fair Value		2,660.8
Amount at which shown in balance sheet		2,660.8
Fixed Maturity and Short-Term Investments
Summary of Investments, Other than Investments in Related Parties, Reportable Data
Cost		13,295.6
Amount at which shown in balance sheet		$ 13,172.5
[1] (a) Represents original cost of equity securities, and as to fixed incomes, original cost reduced by repayments and adjusted for amortization of premium or accrual of discount.

Schedule II - Condensed Finan_2

Schedule II - Condensed Financial Information of Registrant Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets:
Short-term investments	$ 1,032.6	$ 860.8
Other assets	981.5	874.8
Total assets	26,501.4	25,159.4
Liabilities:
Debt	1,591.2	1,597
Total liabilities	20,090.7	18,986.2
Common Shareholders' Equity:
Common stock	278.3	296.9
Additional paid-in capital	678.7	1,141.8
Retained earnings	5,644.3	5,321.8
Accumulated other comprehensive loss	(132.4)	(517.8)
Unallocated ESSOP Shares	58.2	69.5
Total Common Shareholders' Equity	6,410.7	6,173.2
Liabilities and Common Shareholders' Equity:
Total liabilities, preferred stock and common shareholders' equity	26,501.4	25,159.4
Parent Company [Member]
Assets:
Bond and notes	10.5	10.5
Short-term investments	21.1	35.1
Cash	5	2
Investments in, and indebtedness of related parties	8,027.7	7,823
Other assets	116.6	104.8
Total assets	8,181	7,975.5
Liabilities:
Accounts payable and accrued expenses	69.6	98.8
Debt	1,591.2	1,589.9
Accounts Payable, Related Party, Type [Extensible Enumeration]	109.4	120.5
Total liabilities	1,770.3	1,809.2
Liabilities and Common Shareholders' Equity:
Total liabilities, preferred stock and common shareholders' equity	$ 8,181	$ 7,975.5

Schedule II - Condensed Finan_3

Schedule II - Condensed Financial Information of Registrant Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Investment income from subsidiaries									$ 578.3	$ 459.5	$ 434.3
Realized Investment Gains Losses From Sales									(15.2)	185.7	6.9
Total revenues	$ 1,941.1	$ 1,760.1	$ 1,798.3	$ 1,758.7	$ 2,345.5	$ 1,721	$ 1,810.3	$ 2,206.6	7,258.3	8,083.7	9,341.6
Expenses:
Federal income taxes (credits)									148.7	170.9	387.7
Net Income	$ 190.6	$ 52.6	$ 155.5	$ 199.8	$ 512.1	$ (91.7)	$ (40.1)	$ 306.3	598.6	686.4	1,534.3
Parent Company [Member]
Revenues:
Investment income from subsidiaries									122	118	100.3
Real estate and other income									4.1	4.2	4.3
Other investment income									4.8	1.2	0.2
Realized Investment Gains Losses From Sales									(4.5)	0	0
Total revenues									126.5	123.6	104.9
Expenses:
Interest - subsidiaries									4.2	3.9	3.9
Interest - other									67.1	67.1	55.9
Real estate and other expenses									4.8	4.5	4.7
General expenses, taxes and fees									57.1	23.6	17.4
Total expenses									133.3	99.2	82
Revenues, net of expenses									(6.8)	24.3	22.8
Federal income taxes (credits)									(0.8)	2.9	(0.9)
Income (loss) before equity in earnings (losses) of subsidiaries									(5.9)	21.3	23.7
Dividends received									673.3	614.6	566.7
Earnings (losses) in excess of dividends									(68.6)	50.5	943.8
Net Income									$ 598.6	$ 686.4	$ 1,534.3

Schedule II - Condensed Finan_4

Schedule II - Condensed Financial Information of Registrant Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 190.6	$ 52.6	$ 155.5	$ 199.8	$ 512.1	$ (91.7)	$ (40.1)	$ 306.3	$ 598.6	$ 686.4	$ 1,534.3
Adjustments to reconcile net income to net cash provided by operating activities:
Federal income taxes									47.1	54.7	(151.4)
Realized Investment Gains (Losses)									(67)	62.2	6.9
Other - net									136.3	1.9	160.9
Total									880.4	1,170.6	1,311.7
Cash flows from investing activities:
Maturities and early calls									1,353.2	1,356.1	1,410.9
Net decrease (increase) in short-term investments									(362.6)	(295.7)	183.9
Total									25.3	(415)	(936.5)
Cash flows from financing activities:
Issuance of common shares									31.1	26.6	60
Redemption of debentures and notes									(5.3)	0	(21.7)
Dividends on common shares									(275.5)	(579.7)	(1,019.2)
Treasury stock acquired									(535.3)	(281.2)	0
Other - net									1.8	1.5	2.5
Total									(783.2)	(832.7)	(335.7)
Increase (decrease) in cash									122.5	(77.1)	39.4
Cash, beginning of year				81					81
Cash, end of year	202.8				81				202.8	81
Parent Company [Member]
Cash flows from operating activities:
Net income									598.6	686.4	1,534.3
Adjustments to reconcile net income to net cash provided by operating activities:
Accounts receivable									(0.9)	0	0.6
Federal income taxes									(49.8)	59.4	(17.9)
Excess of equity in net (income) loss of subsidiaries over cash dividends received									68.6	(50.5)	(943.8)
Realized Investment Gains (Losses)									4.5	0	0
Other - net									14.7	(34.8)	11.5
Total									635.8	660.6	584.7
Cash flows from investing activities:
Sale of fixed assets for Company use									0	0	0.1
Purchase of fixed assets for Company use									(3.2)	(4.1)	(6.9)
Net repayment (issuance) of notes to related parties									54.6	64.9	(351.6)
Net decrease (increase) in short-term investments									13.9	(23.8)	21.5
Investment In,And Indebtedness Of Related Parties, Net									85	140	100
Total									150.3	176.9	(236.9)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt									0	0	642.5
Net receipt (repayment) of notes and loans from related parties									(5.1)	(4.8)	(13.5)
Issuance of common shares									31.1	26.6	60
Redemption of debentures and notes									0	0	(19.5)
Dividends on common shares									(275.5)	(579.7)	(1,019.2)
Treasury stock acquired									(535.3)	(281.2)	0
Other - net									1.7	1.5	2
Total									(783.1)	(837.6)	(347.6)
Increase (decrease) in cash									3	0	0.1
Cash, beginning of year				$ 2				$ 2	2	2	1.9
Cash, end of year	$ 5				$ 2				$ 5	$ 2	$ 2

Schedule II - Condensed Finan_5

Schedule II - Condensed Financial Information of Registrant Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Senior Notes Due 2026 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	$ 550
Debt Instrument, Interest Rate, Stated Percentage	3.875%	3.875%
Maturity date of debt	Aug. 26, 2026	Aug. 26, 2026
Senior Notes Due 2024 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	$ 400
Debt Instrument, Interest Rate, Stated Percentage	4.875%	4.875%
Maturity date of debt	Oct. 01, 2024	Oct. 01, 2024
Senior Notes Due 2051
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	$ 650
Debt Instrument, Interest Rate, Stated Percentage	3.85%	3.85%
Maturity date of debt	Jun. 11, 2051	Jun. 11, 2051

Schedule II - Condensed Finan_6

Schedule II - Condensed Financial Information of Registrant Share Repurchase (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	2 Months Ended	12 Months Ended
	Feb. 20, 2024	Dec. 31, 2023
Subsequent Event
Condensed Financial Statements, Captions [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ 83.1
Treasury Stock, Shares, Acquired	2.9
Treasury Stock Acquired, Average Cost Per Share	$ 28.33
August 18, 2022 Authorization
Condensed Financial Statements, Captions [Line Items]
Stock Repurchase Program, Authorized Amount		$ 450
Treasury Stock, Value, Acquired, Cost Method		$ 168.7
Treasury Stock, Shares, Acquired		6.7
Treasury Stock Acquired, Average Cost Per Share		$ 25.13
May 12, 2023 Authorization
Condensed Financial Statements, Captions [Line Items]
Stock Repurchase Program, Authorized Amount		$ 450
Treasury Stock, Value, Acquired, Cost Method		$ 366.5
Treasury Stock, Shares, Acquired		14.2
Treasury Stock Acquired, Average Cost Per Share		$ 25.82

Schedule III - Supplementary _2

Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Supplementary Insurance Information, by Segment
Deferred Policy Acquisition Costs		$ 417.8		$ 382.5	$ 350.4
Loss and Loss Adjustment Expenses Reserves		12,538.2		12,221.5	11,425.5
Unearned Premiums		3,042.6		2,787.8	2,559.4
Other Policyholders' Benefits and Funds		150.4		182.2	190.6
Premium Revenue		6,445.9		7,342.1	7,559.8
Net Investment Income		578.3		459.5	434.3
Loss and Loss Adjustment Expenses		2,596.6		2,440.2	2,420.9
Amortization of Deferred Policy Acquisition Costs		680		591.4	502.2
Other Operating Expenses		3,234.1		4,194.5	4,496.3
Premiums Written		6,682.9		7,511.6	7,685
Reinsurance Recoverables Policy And Loss Reserves		5,776		5,468.5	4,825.1
Disposal Group, Not Discontinued Operations
Supplementary Insurance Information, by Segment
Loss and Loss Adjustment Expenses Reserves		54.9
Unearned Premiums		0.1
General Insurance Segment [Member]
Supplementary Insurance Information, by Segment
Deferred Policy Acquisition Costs		417.6		382.2	349.9
Loss and Loss Adjustment Expenses Reserves		6,955.2		6,824.8	6,587
Unearned Premiums		2,253.1		2,028.5	1,870.7
Other Policyholders' Benefits and Funds		109.3		137.1	133.6
Premium Revenue		4,119.2		3,808.6	3,555.5
Net Investment Income		462.7		358	342.4
Loss and Loss Adjustment Expenses		2,553.3		2,364.6	2,303.1
Amortization of Deferred Policy Acquisition Costs		680		591.2	501.9
Other Operating Expenses		723		669.5	648
Premiums Written		4,356.3		3,978.2	3,680.9
Title Insurance Group [Member]
Supplementary Insurance Information, by Segment
Deferred Policy Acquisition Costs		0		0	0
Loss and Loss Adjustment Expenses Reserves		598.5		612.8	594.2
Unearned Premiums		0		0	0
Other Policyholders' Benefits and Funds		1.5		3.3	6.2
Premium Revenue		2,300.9		3,500.6	3,960.5
Net Investment Income		57		47.9	43.8
Loss and Loss Adjustment Expenses		48.7		89.1	112.9
Amortization of Deferred Policy Acquisition Costs		0		0	0
Other Operating Expenses		2,438.2		3,484.6	3,820.6
Premiums Written		2,300.9		3,500.6	3,960.5
RFIG Run-off [Member]
Supplementary Insurance Information, by Segment
Deferred Policy Acquisition Costs		0	[1]	0	0
Loss and Loss Adjustment Expenses Reserves		0	[1]	77.9	111.2
Unearned Premiums		0	[1]	0.1	0.2
Other Policyholders' Benefits and Funds		0	[1]	0	0
Premium Revenue		16.4	[1]	23.2	32.6
Net Investment Income		6.3	[1]	6.7	11.4
Loss and Loss Adjustment Expenses		(11)	[1]	(17.5)	(1.7)
Amortization of Deferred Policy Acquisition Costs		0	[1]	0	0
Other Operating Expenses		12.5	[1]	12.3	13
Premiums Written		16.4	[1]	23.1	32.4
Corporate & Other [Member]
Supplementary Insurance Information, by Segment
Deferred Policy Acquisition Costs	[2]	0.2		0.2	0.5
Loss and Loss Adjustment Expenses Reserves	[2]	6.6		6.3	7.6
Unearned Premiums	[2]	0		0	0
Other Policyholders' Benefits and Funds	[2]	30.8		31.8	39.4
Premium Revenue	[2]	9.1		9.6	11
Net Investment Income	[3]	52.2		46.8	36.5
Loss and Loss Adjustment Expenses	[3]	5.5		4	6.5
Amortization of Deferred Policy Acquisition Costs	[3]	0		0.2	0.3
Other Operating Expenses	[3]	60.1		28	14.5
Premiums Written	[3]	9.1		9.6	10.9
Reinsurance Recoverable [Member]
Supplementary Insurance Information, by Segment
Deferred Policy Acquisition Costs	[4]	0		0	0
Loss and Loss Adjustment Expenses Reserves	[4]	4,977.7		4,699.5	4,125.3
Unearned Premiums	[4]	789.5		759.1	688.4
Other Policyholders' Benefits and Funds	[4]	8.6		9.8	11.3
Premium Revenue	[4]	0		0	0
Net Investment Income	[4]	0		0	0
Loss and Loss Adjustment Expenses	[4]	0		0	0
Amortization of Deferred Policy Acquisition Costs	[4]	0		0	0
Other Operating Expenses	[4]	0		0	0
Premiums Written	[4]	$ 0		$ 0	$ 0
[1]RFIG Run-off loss and loss adjustment expense reserves of $54.9 and unearned premiums of $0.1 have been classified as held-for-sale as of December 31, 2023. See Note 2 in the Notes to Consolidated Financial Statements included in the Annual Report on Form 10-K for further discussion.[2]Includes amounts for a small life and accident insurance business as well as those of the parent holding company, its internal corporate services subsidiaries and consolidation elimination adjustments.[3] (b) Includes amounts for a small life and accident insurance business as well as those of the parent holding company, its internal corporate services subsidiaries and consolidation elimination adjustments.

Schedule IV - Reinsurance (Deta

Schedule IV - Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reinsurance Premiums for Insurance Companies, by Product Segment
Gross amount	$ 8,846.4	$ 9,563.3	$ 9,523.6
Ceded Premiums Earned	2,496.7	2,310.5	2,039
Assumed Premiums Earned	96.2	89.4	75.1
Net premiums earned	$ 6,445.9	$ 7,342.1	$ 7,559.8
Percentage of amount assumed to net	1.50%	1.20%	1%
Business Intersegment, Eliminations [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Gross amount	$ 0	$ 0	$ 0
Ceded Premiums Earned	(0.3)	(0.3)	(0.4)
Assumed Premiums Earned	(0.3)	(0.3)	(0.4)
Net premiums earned	$ 0	$ 0	$ 0
Percentage of amount assumed to net	0%	0%	0%
Life Insurance in Force [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Gross amount	$ 933.8	$ 1,266.7	$ 1,473.2
Ceded Premiums Earned	563.3	784.5	878.5
Assumed Premiums Earned	0	0	0
Net premiums earned	$ 370.4	$ 482.1	$ 594.6
Percentage of amount assumed to net	0%	0%	0%
Life Insurance [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Gross amount	$ 6.5	$ 7.1	$ 7.8
Ceded Premiums Earned	2.6	3.2	3
Assumed Premiums Earned	0	0	0
Net premiums earned	$ 3.8	$ 3.9	$ 4.8
Percentage of amount assumed to net	0%	0%	0%
General Insurance [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Gross amount	$ 6,513.2	$ 6,021	$ 5,509.1
Ceded Premiums Earned	2,488.6	2,299.5	2,027.3
Assumed Premiums Earned	94.7	87.1	73.7
Net premiums earned	$ 4,119.2	$ 3,808.6	$ 3,555.5
Percentage of amount assumed to net	2.30%	2.30%	2.10%
Title Insurance Group [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Gross amount	$ 2,299.1	$ 3,498.1	$ 3,958.6
Ceded Premiums Earned	0	0.1	0
Assumed Premiums Earned	1.8	2.6	1.8
Net premiums earned	$ 2,300.9	$ 3,500.6	$ 3,960.5
Percentage of amount assumed to net	0.10%	0.10%	0%
RFIG Run-off [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Gross amount	$ 16.4	$ 23.2	$ 32.6
Ceded Premiums Earned	0	0	0
Assumed Premiums Earned	0	0	0
Net premiums earned	$ 16.4	$ 23.2	$ 32.6
Percentage of amount assumed to net	0%	0%	0%
Accident and health Insurance [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Gross amount	$ 11.1	$ 13.7	$ 15.2
Ceded Premiums Earned	5.8	8	9
Assumed Premiums Earned	0	0	0
Net premiums earned	$ 5.3	$ 5.6	$ 6.1
Percentage of amount assumed to net	0%	0%	0%
Life & Accident Insurance [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment
Gross amount	$ 17.6	$ 20.8	$ 23.1
Ceded Premiums Earned	8.4	11.2	12.1
Assumed Premiums Earned	0	0	0
Net premiums earned	$ 9.1	$ 9.6	$ 11
Percentage of amount assumed to net	0%	0%	0%

Schedule V - Valuation and Qu_2

Schedule V - Valuation and Qualifying Accounts (Details) - Reserve for unrecoverable reinsurance [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 43		$ 40.1	$ 36.5
Charged to Cost and Expenses	0.6	[1]	2.9	3.5
Charged to Other Accounts - Describe	0		0	0
Deductions - Describe	0		0	0
Balance at End of Period	43.6		$ 43	$ 40.1
Disposal Group, Not Discontinued Operations
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Charged to Cost and Expenses	$ 0.1
[1]RFIG Run-off credit loss reserve of $0.1 has been classified as held-for-sale as of December 31, 2023. See Note 2 in the Notes to Consolidated Financial Statements included in the Annual Report on Form 10-K for further discussion.

Schedule VI - Supplemental In_2

Schedule VI - Supplemental Information Concerning Property-Casualty Insurance Operations (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Supplemental Information for Property, Casualty Insurance Underwriters
Current Year Loss and Loss Adjustment Expenses		$ 2,886.8	$ 2,711.1	$ 2,610.4
Prior Year Loss and Loss Adjustment Expenses		(305.8)	(282.6)	(210.6)
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Consolidated Property and Casualty Insurance Entity [Member]
Supplemental Information for Property, Casualty Insurance Underwriters
Deferred Policy Acquisition Costs	[1]	417.6	382.2	349.9
Loss and Loss Adjustment Expense Reserves	[1],[2]	6,955.2	6,824.8	6,587
Discount If Any Deducted From Reserves	[1]	179.9	184.7	174.8
Unearned Premiums	[1],[2]	2,253.1	2,028.5	1,870.7
Earned Premiums	[1]	4,119.2	3,808.6	3,555.5
Net Investment Income	[1]	462.7	358	342.4
Current Year Loss and Loss Adjustment Expenses	[1]	2,770.7	2,545.1	2,418.3
Prior Year Loss and Loss Adjustment Expenses	[1]	(234)	(193.1)	(137.9)
Amortization of Deferred Policy Acquisition Costs	[1]	680	591.2	501.9
Paid Loss and Loss Adjustment Expenses	[1]	2,406.2	2,114.2	2,021.3
Premiums Written	[1]	$ 4,356.3	$ 3,978.2	$ 3,680.9
[1]Includes consolidated property-casualty entities. The amounts relating to the Company's unconsolidated property-casualty subsidiaries and the proportionate share of the registrant's and its subsidiaries' 50%-or-less owned property-casualty equity investees are immaterial and have, therefore, been omitted from this schedule.[2]See note (c) to Schedule III.