10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ Quarterly Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended March 31, 2021

or

☐ Transition Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from                      to                     

Commission File Number 000-19289

STATE AUTO FINANCIAL CORPORATION

(Exact name of Registrant as specified in its charter)

Ohio			31-1324304
(State or other jurisdiction of incorporation or organization)			(I.R.S. Employer Identification No.)
518 East Broad Street	Columbus	Ohio	43215-3976
(Address of principal executive offices)			(Zip Code)

Registrant’s telephone number, including area code: (614) 464-5000

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading symbol	Name of each exchange on which registered
Common shares, without par value	STFC	The NASDAQ Global Select Market

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes  ý    No   ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes  ý    No   ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	☐	Accelerated filer	x
Non-accelerated filer	☐	Smaller reporting company	☐
(Do not check if a smaller reporting company)		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes  ☐    No   ý

On April 30, 2021, the Registrant had 44,051,645 Common Shares outstanding.

Index to Form 10-Q Quarterly Report for the three month periods ended March 31, 2021

	Part I. Financial Information
Item 1.	Financial Statements (Unaudited)
	Condensed consolidated balance sheets – March 31, 2021 and December 31, 2020	1
	Condensed consolidated statements of income – Three months ended March 31, 2021 and 2020	2
	Condensed consolidated statements of comprehensive income – Three months ended March 31, 2021 and 2020	3
	Condensed consolidated statements of stockholders’ equity - Three months ended March 31, 2021 and 2020	4
	Condensed consolidated statements of cash flows – Three months ended March 31, 2021 and 2020	5
	Notes to condensed consolidated financial statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	20
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	41
Item 4.	Controls and Procedures	42
	Part II. Other Information
Item 1.	Legal Proceedings	43
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	43
Item 4.	Mine Safety Disclosures	43
Item 5.	Other Information	43
Item 6.	Exhibits	44
	Signatures	45

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

PART I – FINANCIAL STATEMENTS

Item 1. Condensed Consolidated Balance Sheets

($ and shares in millions, except per share amounts)	March 31, 2021		December 31, 2020
(unaudited)
Assets
Fixed maturities, available-for-sale, at fair value (amortized cost $2,147.5 and $2,117.0, respectively)	$	2,209.0	$	2,237.2
Equity securities	399.6		389.7
Other invested assets	76.4		71.1
Other invested assets, at cost	11.8		12.1
Notes receivable from affiliate	70.0		70.0
Total investments	2,766.8		2,780.1
Cash and cash equivalents	59.1		90.7
Accrued investment income and other assets	31.0		29.7
Premiums receivable	12.3		14.0
Deferred policy acquisition costs (affiliated net assumed $32.5 and $30.1, respectively)	121.2		122.2
Reinsurance recoverable on losses and loss expenses payable	23.6		24.3
Prepaid reinsurance premiums	8.5		8.3
Current federal income taxes	1.7		1.7
Net deferred federal income taxes	37.1		27.3
Property and equipment, at cost (net of accumulated depreciation of $3.5 and $3.5, respectively)	4.2		4.2
Total assets	$	3,065.5	$	3,102.5
Liabilities and Stockholders’ Equity
Losses and loss expenses payable (affiliated net assumed $454.6 and $438.8, respectively)	$	1,066.3	$	1,050.4
Unearned premiums (affiliated net assumed $466.2 and $452.4, respectively)	726.7		723.4
Notes payable (affiliates $15.3 and $15.3, respectively)	122.1		122.1
Pension and postretirement benefits	59.2		66.2
Due to affiliate	22.1		11.2
Other liabilities (affiliated net assumed $17.3 and $22.4, respectively)	97.1		119.2
Total liabilities	2,093.5		2,092.5
Stockholders’ equity:
Common stock, without par value. Authorized 100.0 shares; 50.9 and 50.7 shares issued, respectively, at stated value of $2.50 per share	127.4		126.8
Treasury stock, 6.9 and 6.9 shares, respectively, at cost	(118.9)		(118.4)
Additional paid-in capital	220.1		213.3
Accumulated other comprehensive (loss) income	(30.1)		13.9
Retained earnings	773.5		774.4
Total stockholders’ equity	972.0		1,010.0
Total liabilities and stockholders’ equity	$	3,065.5	$	3,102.5

See accompanying notes to condensed consolidated financial statements.

1

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Condensed Consolidated Statements of Income

($ in millions, except per share amounts)	Three months ended March 31
(unaudited)	2021		2020
Earned premiums (affiliated net assumed $78.0 and $58.3, respectively)	$	355.9	$	330.5
Net investment income (affiliates $0.7 and $0.7, respectively)	17.6		18.9
Net investment gain (loss)	38.2		(135.2)
Other income from affiliates	0.5		0.6
Total revenues	412.2		214.8
Losses and loss expenses (affiliated net assumed $113.7 and $10.9, respectively)	280.8		239.4
Acquisition and operating expenses (affiliated net assumed $37.1 and $20.9, respectively)	121.0		114.9
Interest expense (affiliates $0.2 and $0.2, respectively)	1.1		1.2
Other expenses	3.7		3.3
Total expenses	406.6		358.8
Income (loss) before federal income taxes	5.6		(144.0)
Federal income tax expense (benefit):
Deferred	2.0		(29.4)
Total federal income tax expense (benefit)	2.0		(29.4)
Net income (loss)	$	3.6	$	(114.6)
Earnings (loss) per common share:
Basic	$	0.08	$	(2.62)
Diluted	$	0.08	$	(2.62)

See accompanying notes to condensed consolidated financial statements.

2

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Consolidated Statements of Comprehensive Loss

($ in millions, except per share amounts)	Three months ended March 31
(unaudited)	2021		2020
Net income (loss)	$	3.6	$	(114.6)
Other comprehensive (loss) income, net of tax:
Net unrealized holding gains on available-for-sale investments:
Unrealized holding (losses) gains	(57.2)		31.0
Reclassification adjustments for gains realized in net income	(1.5)		(2.4)
Income tax benefit (expense)	12.4		(6.0)
Total net unrealized holding (losses) gains on available-for-sale investments	(46.3)		22.6
Net unrecognized benefit plan obligations:
Reclassification adjustments for amortization to statements of income:
Negative prior service cost	(1.6)		(1.6)
Net actuarial loss	4.5		3.7
Income tax expense	(0.6)		(0.5)
Total net unrecognized benefit plan obligations	2.3		1.6
Other comprehensive (loss) income	(44.0)		24.2
Comprehensive loss	$	(40.4)	$	(90.4)

See accompanying notes to condensed consolidated financial statements.

3

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Condensed Consolidated Statements of Stockholders’ Equity

(in millions)	Three months ended March 31
	2021		2020
Common shares:
Balance at beginning of period	50.7		50.4
Issuance of shares	0.2		0.2
Balance at March 31	50.9		50.6
Treasury shares:
Balance at beginning of period	(6.9)		(6.9)
Balance at March 31	(6.9)		(6.9)
Common stock:
Balance at beginning of period	$	126.8	$	125.9
Issuance of shares	0.6		0.6
Balance at March 31	$	127.4	$	126.5
Treasury stock:
Balance at beginning of period	$	(118.4)	$	(117.5)
Shares acquired on stock award exercises and vested restricted shares	(0.5)		(0.9)
Balance at March 31	$	(118.9)	$	(118.4)
Additional paid-in capital:
Balance at beginning of period	$	213.3	$	206.7
Issuance of common stock	0.6		1.3
Stock awards granted	6.2		1.1
Balance at March 31	$	220.1	$	209.1
Accumulated other comprehensive loss:
Balance at beginning of period	$	13.9	$	(37.9)
Change in net unrealized holding (losses) gains on available-for-sale investments	(46.3)		22.6
Change in net unrecognized benefit plan obligations	2.3		1.6
Balance at March 31	$	(30.1)	$	(13.7)
Retained earnings:
Balance at beginning of period	$	774.4	$	782.7
Cumulative effect of change in accounting to establish an allowance for expected credit losses at January 1, 2020	—		(0.5)
Net income (loss)	3.6		(114.6)
Dividends declared, $0.10 and $0.10 per share (affiliates $2.6 and $2.6, respectively)	$	(4.5)	$	(4.4)
Balance at March 31	773.5		663.2
Total stockholders’ equity at March 31	$	972.0	$	866.7

See accompanying notes to condensed consolidated financial statements.

4

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Condensed Consolidated Statements of Cash Flows

($ in millions)	Three months ended March 31
(unaudited)	2021		2020
Cash flows from operating activities:
Net income (loss)	$	3.6	$	(114.6)
Adjustments to reconcile net income (loss) to net cash used in operating activities
Depreciation and amortization, net	1.8		1.6
Share-based compensation	6.7		0.5
Net investment (gain) loss	(38.2)		135.2
Changes in operating assets and liabilities:
Deferred policy acquisition costs	1.0		(2.2)
Accrued investment income and other assets	(1.3)		(1.5)
Premiums receivables	1.7		(1.4)
Postretirement and pension benefits	(6.4)		(0.9)
Reinsurance recoverable on losses and loss expenses payable and prepaid reinsurance premiums	0.5		(26.5)
Other liabilities and due to/from affiliates, net	(9.5)		(24.8)
Losses and loss expenses payable	15.9		19.5
Unearned premiums	3.3		16.5
Deferred tax on share-based awards	(0.4)		(0.2)
Federal income taxes	2.4		(29.2)
Net cash used in operating activities	(18.9)		(28.0)
Cash flows from investing activities:
Purchases of fixed maturities available-for-sale	(239.7)		(122.4)
Purchases of equity securities	(9.4)		(16.1)
Purchases of other invested assets	(0.1)		(6.6)
Maturities, calls and pay downs of fixed maturities available-for-sale	102.8		67.9
Sales of fixed maturities available-for-sale	106.0		83.5
Sales of equity securities	31.1		13.2
Sales of other invested assets	0.3		0.4
Disposals of property and equipment	—		0.2
Net cash (used in) provided by investing activities	(9.0)		20.1
Cash flows from financing activities:
Proceeds from issuance of common stock	1.2		1.8
Payments to acquire treasury stock	(0.4)		(0.9)
Payment of dividends	(4.5)		(4.4)
Proceeds from short-term debt	—		60.0
Net cash (used in) provided by financing activities	(3.7)		56.5
Net (decrease) increase in cash and cash equivalents	(31.6)		48.6
Cash and cash equivalents at beginning of period	90.7		78.0
Cash and cash equivalents at end of period	$	59.1	$	126.6
Supplemental disclosures:
Interest paid (affiliates $0.2 and $0.2, respectively)	$	1.1	$	1.2

See accompanying notes to condensed consolidated financial statements.

5

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements (Unaudited)

1. Basis of Presentation

The accompanying unaudited condensed consolidated financial statements of State Auto Financial Corporation and Subsidiaries (“State Auto Financial” or the “Company”) have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. In the opinion of the Company, all adjustments (consisting of normal, recurring accruals) considered necessary for a fair statement have been included. Operating results for the three months ended March 31, 2021, are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The balance sheet at December 31, 2020, has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements.

For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the “2020 Form 10-K”). Capitalized terms used herein and not otherwise defined shall have the meaning ascribed to them in the 2020 Form 10-K.

Adoption of Recent Accounting Pronouncements

Income Taxes - Simplifying the Accounting for Income Taxes

In December 2019, the FASB issued ASU 2019-12 which updated guidance for the accounting for income taxes. The updated guidance is intended to simplify the accounting for income taxes by removing several exceptions contained in existing guidance and amending other existing guidance to simplify several other income tax accounting matters. The guidance became effective for annual and interim reporting periods after December 15, 2020 and did not have a material impact on the Company's results of operations, consolidated financial position or cash flows.

Pending Adoption of Recent Accounting Pronouncements

For information regarding other accounting pronouncements that the Company has not yet adopted, see the “Pending Adoption of Recent Accounting Pronouncements” section of Note 1 of the Notes to Consolidated Financial Statements in the 2020 Form 10-K.

2. Investments

The following tables set forth the amortized cost and fair value of investments by investment category at March 31, 2021 and December 31, 2020:

($ millions)	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Fair value
March 31, 2021
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	448.4	$	23.0	$	(0.4)	$	471.0
Obligations of states and political subdivisions	480.4		22.0		(1.9)		500.5
Corporate securities	488.4		17.0		(2.2)		503.2
U.S. government agencies mortgage-backed securities	730.3		15.4		(11.4)		734.3
Total available-for-sale fixed maturities	$	2,147.5	$	77.4	$	(15.9)	$	2,209.0
($ millions)	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Fair value
December 31, 2020
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	506.5	$	45.2	$	—	$	551.7
Obligations of states and political subdivisions	511.3		30.4		(0.2)		541.5
Corporate securities	459.9		23.4		—		483.3
U.S. government agencies mortgage-backed securities	639.3		22.9		(1.5)		660.7
Total available-for-sale fixed maturities	$	2,117.0	$	121.9	$	(1.7)	$	2,237.2

6

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

The following tables set forth the Company’s gross unrealized losses and fair value on its investments by lot, aggregated by investment category and length of time for individual securities that have been in a continuous unrealized loss position for which an allowance for credit losses has not been recorded at March 31, 2021 and December 31, 2020:

($ millions, except # of positions)	Less than 12 months					12 months or more					Total
	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions
March 31, 2021
Fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	51.6	$	(0.4)	7	$	—	$	—	—	$	51.6	$	(0.4)	7
Obligations of states and political subdivisions	111.7		(1.9)		18	—		—		—	111.7		(1.9)		18
Corporate securities	110.9		(2.2)		21	—		—		—	110.9		(2.2)		21
U.S. government agencies mortgage-backed securities	354.8		(11.3)		74	10.9		(0.1)		5	365.7		(11.4)		79
Total temporarily impaired securities	$	629.0	$	(15.8)	120	$	10.9	$	(0.1)	5	$	639.9	$	(15.9)	125

($ millions, except # of positions)	Less than 12 months					12 months or more					Total
	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions
December 31, 2020
Fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	9.6	$	—	4	$	—	$	—	—	$	9.6	$	—	4
Obligations of states and political subdivisions	19.5		(0.2)		5	—		—		—	19.5		(0.2)		5
Corporate securities	1.5		—		2	—		—		—	1.5		—		2
U.S. government agencies mortgage-backed securities	136.1		(1.4)		35	7.0		(0.1)		3	143.1		(1.5)		38
Total temporarily impaired securities	$	166.7	$	(1.6)	46	$	7.0	$	(0.1)	3	$	173.7	$	(1.7)	49

The Company reviewed its available-for-sale fixed maturities at March 31, 2021, and determined that no credit impairment existed in the gross unrealized holding losses, due to the reasons discussed below:

•U.S. treasury securities and obligations of U.S. government agencies: These securities were issued by the U.S. Treasury Department or Federal government-sponsored entities. The decline in fair values was attributable to changes in interest rates and not credit quality. The Company does not intend to sell these securities and it is likely that it will not do so before their anticipated recovery. Therefore, the Company does not consider these impaired securities.

•Corporate securities: Corporations in various industries issued these securities. The decline in fair values was attributable to changes in interest rates and not credit quality. The Company reviewed the issuers of these securities to identify any significant adverse change in financial condition, a change in the quality of credit enhancement (if any), a ratings decrease, or negative outlook assignment from a major credit rating agency, and any failure to make interest or principal payments. After these reviews, the Company determined that the decline in fair values was attributable to changes in interest rates and not credit quality. The Company does not intend to sell these securities and it is likely that it will not do so before their anticipated recovery. Therefore, the Company does not consider these impaired securities.

•U.S. government agencies mortgage-backed securities: Federal government-sponsored entities issued these securities. The decline in fair values was attributable to changes in interest rates and not credit quality. The Company does not intend to sell these securities and it is likely that it will not do so before their anticipated recovery. Therefore, the Company does not consider these impaired securities.

The Company regularly monitors its available-for-sale fixed maturities that have fair values less than cost or amortized cost for signs of impairment, an assessment that requires significant management judgment regarding the evidence known. Such

7

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

judgments could change in the future as more information becomes known, which could negatively impact the amounts reported. Among the factors that management considers for fixed maturity securities are the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. When a fixed maturity has been determined to have an impairment, the impairment charge representing the credit loss is recognized in earnings as a realized loss and on the balance sheet as an allowance for credit losses netted with the amortized cost of fixed maturities. Future increases in fair value, if related to credit factors, are recognized through earnings limited to the amount previously recognized as an allowance for credit losses. The amount related to non-credit factors is recognized in accumulated other comprehensive income and future increases or decreases in fair value, if not credit losses, are included in accumulated other comprehensive income.

The following table sets forth the amortized cost and fair value of available-for-sale fixed maturities by contractual maturity at March 31, 2021:

($ millions)	Amortized cost		Fair value
Due in 1 year or less	$	158.5	$	159.7
Due after 1 year through 5 years	536.7		562.2
Due after 5 years through 10 years	165.9		170.5
Due after 10 years	556.1		582.3
U.S. government agencies mortgage-backed securities	730.3		734.3
Total	$	2,147.5	$	2,209.0

Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay the obligations with or without call or prepayment penalties.

At March 31, 2021, State Auto P&C had U.S. government agencies mortgage-backed fixed maturity securities, with a carrying value of approximately $106.5 million pledged as collateral for loans from the Federal Home Loan Bank of Cincinnati ("FHLB"). In accordance with the terms of the FHLB Loans, State Auto P&C retains all rights regarding these pledged securities.

At March 31, 2021, State Auto P&C had fixed maturities with fair values of approximately $30.2 million pledged as collateral for the performance obligations under its reinsurance agreement with Home State County Mutual Insurance Company. In accordance with the terms of the trust agreement, State Auto P&C retains all rights regarding these securities, which are included in the “U.S. treasury securities and obligations of U.S. government agencies” classification of the Company’s fixed maturity securities portfolio.

Fixed maturities with fair values of $9.4 million and $9.7 million were on deposit with insurance regulators as required by law at March 31, 2021, and December 31, 2020, respectively. The Company retains all rights regarding these securities.

The following table sets forth the components of net investment income for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Fixed maturities	$	15.4	$	15.1
Equity securities	1.6		3.1
Cash and cash equivalents, and other	0.9		1.0
Investment income	17.9		19.2
Investment expenses	0.3		0.3
Net investment income	$	17.6	$	18.9

The Company’s current investment strategy does not rely on the use of derivative financial instruments.

Proceeds on sales of investments were $137.4 million and $97.1 million for the three months ended March 31, 2021, and 2020, respectively.

8

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

The following table sets forth the realized and unrealized holding gains (losses) on the Company’s investment portfolio for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Investment gain (loss), net:
Fixed maturities:
Realized gains on sales of securities	$	3.0	$	3.6
Realized losses on sales of securities	(1.5)		(1.2)
Net gain on fixed securities	1.5		2.4
Net gain (loss) on equity securities	31.5		(122.4)
Net gain (loss) on other invested assets	5.2		(15.4)
Other net realized gain (loss)	—		0.2
Net gain (loss) on investments	$	38.2	$	(135.2)
Change in net unrealized holding (losses) gains, net of tax
Fixed maturities	$	(58.7)	$	28.6
Deferred federal income tax benefit (liability)	12.4		(6.0)
Change in net unrealized holding (losses) gains, net of tax	$	(46.3)	$	22.6

The unrealized holding gains recognized for the three months ended March 31, 2021 on equity securities still held was $27.8 million while unrealized holding losses recognized for the three months ended March 31, 2020 on equity securities still held was $123.3 million. The unrealized holding gains recognized for the three months ended March 31, 2021 on other invested assets still held was $5.2 million while the unrealized holding losses recognized for the three months ended March 31, 2020 on other invested assets still held was $15.4 million.

3. Fair Value of Financial Instruments

Below is the fair value hierarchy that categorizes into three levels the inputs to valuation techniques that are used to measure fair value:

•Level 1 includes observable inputs which reflect quoted prices for identical assets or liabilities in active markets at the measurement date.

•Level 2 includes observable inputs for assets or liabilities other than quoted prices included in Level 1, and it includes valuation techniques which use prices for similar assets and liabilities.

•Level 3 includes unobservable inputs which reflect the reporting entity’s estimates of the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk).

The Company utilizes a nationally recognized third party pricing service to estimate the majority of its investment portfolio’s fair value. The Company obtains one price per security and the processes and control procedures employed by the Company are designed to ensure the value is accurately recorded on an unadjusted basis. Through discussions with the pricing service, the Company gains an understanding of the methodologies used to price the different types of securities, that the data and the valuation methods utilized are appropriate and consistently applied, and that the assumptions are reasonable and representative of fair value. To validate the reasonableness of the valuations obtained from the pricing service, the Company compares to fair value pricing information gathered from other independent pricing sources. At March 31, 2021, and December 31, 2020, the Company did not adjust any of the prices received from the pricing service.

9

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

Fixed Maturities

The Company utilizes a nationally recognized third party pricing service to estimate fair value measurements for the majority of its fixed maturities. The fair value estimate of the Company’s fixed maturity investments are determined by evaluations that are based on observable market information rather than market quotes. Inputs to the evaluations include, but are not limited to, market prices from recently completed transactions and transactions of comparable securities, interest rate yield curves, credit spreads, and other market-observable information. The fixed maturity portfolio pricing obtained from the pricing service is reviewed for reasonableness. The Company regularly selects a sample of security prices which are compared to one or more alternative pricing sources for reasonableness. Any significant discrepancies with the pricing are returned to the pricing service for further explanation and, if necessary, adjustments are made. To date, the Company has not identified any significant discrepancies in the pricing provided by its third party pricing service. Investments valued using these inputs include U.S. treasury securities and obligations of U.S. government agencies, obligations of states and political subdivisions, corporate securities (except for a security discussed below), and U.S. government agencies' mortgage-backed securities. All unadjusted estimates of fair value for fixed maturities priced by the pricing service are included in the amounts disclosed in Level 2 of the hierarchy. If market inputs are unavailable, then no fair value is provided by the pricing service. For these securities, fair value is determined either by requesting brokers who are knowledgeable about these securities to provide a quote; or the Company internally determines the fair values by employing widely accepted pricing valuation models, and depending on the level of observable market inputs, renders the fair value estimate as Level 2 or Level 3.

Equities

The fair value of each equity security is based on an observable market price for an identical asset in an active market and is priced by the same pricing service discussed above. All equity securities are recorded using unadjusted market prices and have been disclosed in Level 1.

 Other Invested Assets

Included in other invested assets is one international fund (“the fund”) that invests in equity securities of foreign issuers and is managed by a third party investment manager. The fund had a fair value of $60.6 million and $55.8 million at March 31, 2021, and December 31, 2020, respectively, which was determined using the fund’s net asset value. The Company employs procedures to assess the reasonableness of the fair value of the fund, including obtaining and reviewing the fund’s audited financial statements. There are no unfunded commitments related to the fund. The Company may not sell its investment in the fund; however, the Company may redeem all or a portion of its investment in the fund at net asset value per share with the appropriate prior written notice. In accordance with ASC 820-10, this investment is measured at fair value using the net asset value per share practical expedient and has not been classified in the fair value hierarchy. Fair values presented here are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the condensed consolidated balance sheets.

The remainder of the Company’s other invested assets consist primarily of holdings in publicly-traded mutual funds. The Company believes that its prices for these publicly-traded mutual funds based on an observable market price for an identical asset in an active market reflect their fair values and consequently these securities have been disclosed in Level 1.

10

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

 The following tables set forth the Company’s investments within the fair value hierarchy at March 31, 2021 and December 31, 2020:

($ millions)	Total		Level 1		Level 2
March 31, 2021
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	471.0	$	—	$	471.0
Obligations of states and political subdivisions	500.5		—		500.5
Corporate securities	503.2		—		503.2
U.S. government agencies mortgage-backed securities	734.3		—		734.3
Total available-for-sale fixed maturities	2,209.0		—		2,209.0
Equity securities:
Large-cap securities	149.2		149.2		—
Mutual and exchange traded funds	250.4		250.4		—
Total equity securities	399.6		399.6		—
Other invested assets	15.8		15.8		—
Total investments	$	2,624.4	$	415.4	$	2,209.0
($ millions)	Total		Level 1		Level 2
December 31, 2020
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	551.7	$	—	$	551.7
Obligations of states and political subdivisions	541.5		—		541.5
Corporate securities	483.3		—		483.3
U.S. government agencies mortgage-backed securities	660.7		—		660.7
Total available-for-sale fixed maturities	2,237.2		—		2,237.2
Equity securities:
Large-cap securities	134.2		134.2		—
Mutual and exchange traded funds	255.5		255.5		—
Total equity securities	389.7		389.7		—
Other invested assets	15.3		15.3		—
Total investments	$	2,642.2	$	405.0	$	2,237.2

The following sections describe the valuation methods used by the Company for each type of financial instrument it holds that is not measured at fair value but for which fair value is disclosed:

Financial Instruments Disclosed, But Not Carried, At Fair Value

Other Invested Assets, at Cost

Included in other invested assets, at cost are common stock of the FHLB and the Trust Securities. The Trust Securities and FHLB common stock are carried at cost, which approximates fair value. The fair value of the FHLB common stock at March 31, 2021, was $11.3 million and the fair value of the Trust Securities was $0.5 million. The investments have been placed in Level 3 of the fair value hierarchy.

11

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

Notes Receivable from Affiliate

The Company has two separate credit agreements with State Automobile Mutual Insurance Company (“State Auto Mutual") pursuant to which it loaned State Auto Mutual a total of $70.0 million at an interest rate of 4.05%, with principal payable in May 2029. The Company estimates the fair value of the notes receivable from affiliate using market quotations for U.S. treasury securities with similar maturity dates and applies an appropriate credit spread. Consequently this has been placed in Level 2 of the fair value hierarchy.

($ millions, except interest rates)	March 31, 2021						December 31, 2020
	Carrying value		Fair value		Interest rate		Carrying value		Fair value		Interest rate
Notes receivable from affiliate, issued May 2019	$	70.0	$	76.6	4.05	%	$	70.0	$	80.4	4.05	%

Notes Payable

Included in notes payable are the FHLB Loans and Subordinated Debentures. The Company estimates the fair value of the FHLB Loans by discounting cash flows using a borrowing rate currently available to the Company for loans with similar terms. The FHLB Loans have been placed in Level 3 of the fair value hierarchy. The carrying amount of the Subordinated Debentures approximates its fair value as the interest rate adjusts quarterly and has been disclosed in Level 3.

($ millions, except interest rates)	March 31, 2021						December 31, 2020
	Carrying value		Fair Value		Interest rate		Carrying value		Fair value		Interest rate
FHLB Loan due 2030: issued $21.5, September 2020 with fixed interest	21.5		20.2		1.37	%	21.5		21.6		1.37	%
FHLB Loan due 2033: issued $85.0, May 2018 with fixed interest	85.3		101.2		3.96	%	85.3		107.1		3.96	%
Affiliate Subordinated Debentures due 2033: issued $15.5, May 2003 with variable interest	15.3		15.3		4.39	%	15.3		15.3		4.43	%
Total notes payable	$	122.1	$	136.7			$	122.1	$	144.0

4. Deferred Acquisition Costs

The following table sets forth net deferred acquisition costs for the three months ended March 31, 2021 and 2020:

($ millions)	2021		2020
Beginning balance at January 1	$	122.2	$	111.1
Acquisition costs deferred	60.6		91.1
Acquisition costs amortized to expense	(61.6)		(88.9)
Ending balance at March 31	$	121.2	$	113.3

12

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

5. Losses and Loss Expenses Payable

The following table sets forth the activity in the liability for losses and loss expenses for the three months ended March 31, 2021 and 2020:

($ millions)	2021		2020
Losses and loss expenses payable, at beginning of period	$	1,050.4	$	1,066.5
Less: reinsurance recoverable on losses and loss expenses payable	24.3		13.6
Net balance at beginning of period	1,026.1		1,052.9
Incurred related to:
Current year	311.3		246.9
Prior years	(30.5)		(7.5)
Total incurred	280.8		239.4
Paid related to:
Current year	105.7		74.1
Prior years	158.5		171.3
Total paid	264.2		245.4
Net balance at end of period	1,042.7		1,046.9
Plus: reinsurance recoverable on losses and loss expenses payable	23.6		39.7
Losses and loss expenses payable, at end of period	$	1,066.3	$	1,086.6

The Company recorded more favorable development related to prior years’ loss and loss expense reserves for the three months ended March 31, 2021, of $30.5 million compared to $7.5 million for the same 2020 period. Favorable development of prior accident years' non-catastrophe loss and ALAE reserves for the three months ended March 31, 2021 was $24.6 million, due to favorable development of $21.8 million and $2.9 million in the commercial and personal insurance segments, respectively. In the commercial insurance segment, all products developed favorably, with workers' compensation and middle market commercial contributing $8.5 million and $8.1 million, respectively. In the personal insurance segment, the favorable development was primarily driven by homeowners, which contributed $2.1 million of favorable development. For the three months ended March 31, 2021, the prior accident years' catastrophe loss and ALAE reserves contributed $3.8 million of favorable development.

For the three months ended March 31, 2020, favorable development of prior accident year's non-catastrophe loss and ALAE reserves was $10.5 million, due to favorable development in the commercial insurance segment. In the commercial insurance segment, all lines contributed favorable development, with small commercial package, middle market commercial, and workers' compensation contributing $5.4 million, $5.1 million, and $4.0 million respectively. Somewhat offsetting the favorable development was adverse development in the personal insurance segment of $6.4 million, driven by personal auto and homeowners which contributed $5.2 million and $2.2 million of adverse development, respectively

6. Reinsurance

The insurance subsidiaries of State Auto Financial, referred to as the STFC Pooled Companies, participate in a quota share reinsurance pooling arrangement (“the Pooling Arrangement”) with the Mutual Pooled Companies.

13

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

The following table sets forth a summary of the Company’s external reinsurance transactions, as well as reinsurance transactions with State Auto Mutual under the Pooling Arrangement, for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Premiums earned:
Assumed from external insurers and reinsurers	$	21.8	$	20.6
Assumed under Pooling Arrangement	355.9		330.5
Ceded to external insurers and reinsurers	(9.0)		(10.6)
Ceded under Pooling Arrangement	(277.9)		(272.2)
Net assumed premiums earned	$	90.8	$	68.3
Losses and loss expenses incurred:
Assumed from external insurers and reinsurers	$	14.5	$	11.7
Assumed under Pooling Arrangement	280.8		239.4
Ceded to external insurers and reinsurers	(3.3)		(33.5)
Ceded under Pooling Arrangement	(167.1)		(228.5)
Net assumed losses and loss expenses incurred	$	124.9	$	(10.9)

7. Income Taxes

The following table sets forth the reconciliation between actual federal income tax expense and the amount computed at the indicated statutory rate for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021				2020
Amount at statutory rate	$	1.2	21.0	%	$	(30.2)	21.0	%
Tax-exempt interest and dividends received deduction	(0.6)		(11.3)		(0.7)		0.5
Other, net	1.4		26.6		1.5		(1.1)
Federal income tax expense (benefit)	2.0		36.3	%	(29.4)		20.4	%

8. Pension and Postretirement Benefit Plans

The following table sets forth information regarding the Company’s share of pension and postretirement benefit plans’

components of net periodic cost for the three months ended March 31, 2021 and 2020:

($ millions)	Pension				Postretirement
	Three months ended March 31
	2021		2020		2021		2020
Service cost	$	1.3	$	1.2	$	—	$	—
Interest cost	2.1		2.4		—		0.1
Expected return on plan assets	(4.3)		(4.4)		—		—
Amortization of:
Negative prior service cost	—		—		(1.4)		(1.4)
Net actuarial loss	3.5		2.3		—		0.1
Net periodic cost (benefit)	$	2.6	$	1.5	$	(1.4)	$	(1.2)

The Company contributed $5.0 million to its pension plan for the three months ended March 31, 2021 and expects to contribute an additional $10.0 million to its pension plan during 2021.

14

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

9. Other Comprehensive (Loss) Income and Accumulated Other Comprehensive (Loss) Income

The following tables set forth the changes in the Company’s accumulated other comprehensive (loss) income ("AOC(L)I"), net of tax, for the three months ended March 31, 2021 and 2020:

($ millions)		Unrealized Gains and Losses on Available-for-Sale  Securities		Benefit Plan Items		Total
Beginning balance at January 1, 2021		$	97.5	$	(83.6)	$	13.9
Other comprehensive loss before reclassifications		(45.1)		—		(45.1)
Amounts reclassified from AOCI (a)		(1.2)		2.3		1.1
Net current period other comprehensive (loss) income		(46.3)		2.3		(44.0)
Ending balance at March 31, 2021		$	51.2	$	(81.3)	$	(30.1)
Beginning balance at January 1, 2020		$	40.4	$	(78.3)	$	(37.9)
Other comprehensive income before reclassifications		24.5		—		24.5
Amounts reclassified from AOCI (a)		(1.9)		1.6		(0.3)
Net current period other comprehensive income		22.6		1.6		24.2
Ending balance at March 31, 2020		$	63.0	$	(76.7)	$	(13.7)
(a)	See separate table below for details about these reclassifications

15

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

    The following tables set forth the reclassifications out of accumulated other comprehensive (loss) income, by component, to the Company’s condensed consolidated statement of income for the three months ended March 31, 2021 and 2020:

($ millions)
Details about Accumulated Other		Three months ended March 31				Affected line item in the Condensed
Comprehensive Income Components						Consolidated Statements of Income
		2021		2020
Unrealized gains on available-for-sale fixed maturity investments		$	1.5	$	2.4	Realized gain on sale of securities
		1.5		2.4		Total before tax
		(0.3)		(0.5)		Tax expense
		1.2		1.9		Net of tax
Amortization of benefit plan items
Negative prior service cost		1.6		1.6		(b)
Net actuarial loss		(4.5)		(3.7)		(b)
		(2.9)		(2.1)		Total before tax
		0.6		0.5		Tax benefit
		(2.3)		(1.6)		Net of tax
Total reclassifications for the period		$	(1.1)	$	0.3
(b)	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see pension and postretirement benefit plans footnote for additional details).

10. Net Earnings (Loss) per Common Share

The following table sets forth the compilation of basic and diluted earnings (loss) per common share for the three months ended March 31, 2021 and 2020:

($ and shares in millions, except per share amounts)	Three months ended March 31
	2021		2020
Numerator:
Net income (loss) for basic earnings (loss) per common share	$	3.6	$	(114.6)
Denominator:
Weighted average shares for basic earnings (loss) per common share	43.9		43.7
Effect of dilutive share-based awards	0.7		—
Adjusted weighted average shares for diluted earnings (loss) per common share	44.6		43.7
Basic net earnings (loss) per common share	$	0.08	$	(2.62)
Diluted net earnings (loss) per common share	$	0.08	$	(2.62)

The following table sets forth stock awards and restricted share units ("RSU award") of the Company that were not included in the computation of diluted earnings (loss) per common share because the exercise price of the awards was greater than the average market price or their inclusion would have been antidilutive for the three months ended March 31, 2021 and 2020:

(shares in millions)	Three months ended March 31
	2021	2020
Total number of antidilutive awards	—	0.5

16

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

11. Segment Information

The Company's reportable segments are: personal insurance, commercial insurance, and investment operations. The reportable insurance segments are business units managed separately because of the differences in the type of customers they serve, the products they provide or services they offer. The insurance segments market a broad line of property and casualty insurance products throughout the United States through independent insurance agencies, which include retail agents and wholesale brokers. The investment operations segment, managed by Stateco, provides investment services.

The Company evaluates the performance of its insurance segments using industry financial measurements based on Statutory Accounting Practices (“SAP”), which include loss and loss adjustment expense ratios, underwriting expense ratios, combined ratios, statutory underwriting gain (loss), net premiums earned and net written premiums. One of the most significant differences between SAP and GAAP is that SAP requires all underwriting expenses to be expensed immediately and not deferred and amortized over the same period the premium is earned.

The investment operations segment is evaluated based on investment returns of assets managed by Stateco. Asset information by segment is not reported for the insurance segments because the Company does not produce such information internally.

17

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

The following table sets forth financial information regarding the Company’s reportable segments and specialty run-off (for the previously exited specialty insurance business) for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Revenue from external sources:
Insurance operations
Personal insurance	$	207.8	$	198.1
Commercial insurance	148.7		132.4
Specialty run-off	(0.6)		—
Total insurance operations	355.9		330.5
Investment operations
Net investment income	17.6		18.9
Net investment gain (loss)	38.2		(135.2)
Total investment operations	55.8		(116.3)
All other	0.5		0.6
Total revenue from external sources	412.2		214.8
Intersegment revenue	1.6		1.6
Total revenue	413.8		216.4
Reconciling items:
Eliminate intersegment revenue	(1.6)		(1.6)
Total consolidated revenues	$	412.2	$	214.8
Segment income (loss) before federal income tax:
Insurance operations SAP underwriting (loss) gain
Personal insurance	$	(49.4)	$	0.3
Commercial insurance	3.0		(30.0)
Specialty run-off	1.6		(0.4)
Total insurance operations	(44.8)		(30.1)
Investment operations
Net investment income	17.6		18.9
Net investment gain (loss)	38.2		(135.2)
Total investment operations	55.8		(116.3)
All other	—		0.1
Total segment income (loss) before reconciling items	11.0		(146.3)
Reconciling items:
GAAP expense adjustments	(1.3)		5.9
Interest expense on corporate debt	(1.1)		(1.2)
Corporate expenses	(3.0)		(2.4)
Total reconciling items	(5.4)		2.3
Total consolidated income (loss) before federal income tax	$	5.6	$	(144.0)

Investable assets attributable to the Company’s investment operations segment totaled $2,825.9 million and $2,870.8 million at March 31, 2021, and December 31, 2020, respectively.

12.  Contingencies and Litigation

In accordance with the Contingencies Topic of the FASB's Accounting Standards Codification, the Company accrues for a litigation-related liability when it is probable that such a liability has been incurred and the amount can be reasonably

18

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Notes to Condensed Consolidated Financial Statements, Continued (Unaudited)

estimated. The Company reviews all litigation on an ongoing basis when making accrual and disclosure decisions. For certain legal proceedings, the Company cannot reasonably estimate a loss or a range of loss, if any, particularly for proceedings that are in their early stages of development or where the plaintiffs seek indeterminate damages. Various factors, including, but not limited to, the outcome of potentially lengthy discovery and the resolution of important factual questions, may need to be determined before probability can be established or before a loss or range of loss can be reasonably estimated. If the loss contingency in question is not both probable and reasonably estimable, the Company does not establish an accrual and the matter will continue to be monitored for any developments that would make the loss contingency both probable and reasonably estimable. Based on currently available information known to the Company, it believes that its reserves for litigation-related liabilities are reasonable. However, in the event that a legal proceeding results in a substantial judgment against, or settlement by, the Company, there can be no assurance that any resulting liability or financial commitment would not have a material adverse effect on the financial condition, results of operations or cash flows of the consolidated financial statements of the Company.

The Company is involved in lawsuits in the ordinary course of its business arising out of or otherwise related to its insurance policies. Additionally, from time to time the Company may be involved in lawsuits, including class actions, in the ordinary course of business but not arising out of or otherwise related to its insurance policies. Recently, these proceedings have included claims and lawsuits seeking coverage under commercial property policies for pure economic losses related to COVID-19. These lawsuits are in various stages of development, in various jurisdictions, and the Company intends to vigorously contest these matters. Based on currently available information, the Company does not believe that any such lawsuits will have a material adverse effect on its consolidated financial position, results of operations, or cash flows. However, the Company cannot provide assurance that it will not be negatively impacted by adverse legislation or adverse judicial rulings in some of these matters. Future court decisions and interpretations, as well as future changes, if any, in legislation could create uncertainties and additional liabilities may arise which could have a material adverse effect on the Company’s consolidated financial position, results of operations, or cash flows.

Additionally, the Company may be impacted by adverse regulatory actions and adverse court decisions where insurance coverages are expanded beyond the scope originally contemplated in its insurance policies. The Company believes that the effects, if any, of such regulatory actions and published court decisions are not likely to have a material adverse effect on its consolidated financial position, results of operations or cash flows.

19

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The term “State Auto Financial” as used below refers only to State Auto Financial Corporation and the terms “our Company,” “we,” “us,” and “our” as used below refer to State Auto Financial Corporation and its consolidated subsidiaries. The term “first quarter” as used below refers to the three months ended March 31 for the time period then ended. For a glossary of terms for State Auto Financial Corporation and its subsidiaries and affiliates and a glossary of selected insurance and accounting terms, see the section entitled “Important Defined Terms Used in this Form 10-K” included in our Annual Report on Form 10-K for the year ended December 31, 2020 (the “2020 Form 10-K”).

The discussion and analysis presented below relates to the material changes in financial condition and results of operations for our consolidated balance sheets as of March 31, 2021 and December 31, 2020, and for the consolidated statements of income for the three month periods ended March 31, 2021 and 2020. This discussion and analysis should be read together with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Item 7 of the 2020 Form 10-K, and in particular the discussions in those sections thereof entitled “Overview,” “Executive Summary,” and “Critical Accounting Policies.” Readers are encouraged to review the entire 2020 Form 10-K, as it includes information regarding our Company not discussed in this Form 10-Q. This information will assist in your understanding of the discussion of our current period financial results.

The discussion and analysis presented below includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Forward-looking statements generally can be identified by the use of forward-looking terminology such as “may,” “will,” “expect,” “intend,” “estimate,” “anticipate,” “project,” “believe” or “continue” or the negative thereof or variations thereon or similar terminology. Forward-looking statements speak only as of the date the statements were made available. Although we believe that the expectations reflected in forward-looking statements have a reasonable basis, we can give no assurance that these expectations will prove to be correct. Forward-looking statements are subject to risks and uncertainties that could cause actual events or results to differ materially from those expressed in or implied by the statements. For a discussion of the most significant risks and uncertainties that could cause our actual results to differ materially from those projected, see “Risk Factors” in Item 1A of the 2020 Form 10-K, updated by Part II, Item 1A of this Form 10-Q. Except to the limited extent required by applicable law, we undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

We have three reportable segments: personal insurance, commercial insurance, and investment operations. The reportable insurance segments are business units managed separately because of the differences in the type of customers they serve or products they provide or services they offer. The insurance segments market a broad line of property and casualty insurance products throughout the United States through independent insurance agencies, which include retail agents and wholesale brokers. The investment operations segment, managed by Stateco, provides investment services. See “Personal and Commercial Insurance” in Item 1 of the 2020 Form 10-K for more information about our insurance segments. The results from our previously exited specialty insurance business are disclosed as "specialty run-off." Financial information about our reportable segments for 2021 is set forth in Note 14 of our condensed consolidated financial statements included in Item 1 of this Form 10-Q.

20

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

 POOLING ARRANGEMENT

The STFC Pooled Companies and the Mutual Pooled Companies participate in a quota share reinsurance pooling arrangement referred to as the “Pooling Arrangement." Under the Pooling Arrangement, State Auto Mutual assumes premiums, losses and expenses from each of the Pooled Companies and in turn cedes to each of the Pooled Companies a specified portion of premiums, losses and expenses based on each of the Pooled Companies’ respective pooling percentages. State Auto Mutual then retains the balance of the pooled business.

The following table sets forth the participants and their participation percentages in the Pooling Arrangement:

STFC Pooled Companies:
State Auto P&C	51.0	%
Milbank	14.0
SA Ohio	—
Total STFC Pooled Companies	65.0	%
State Auto Mutual Pooled Companies:
State Auto Mutual	34.5	%
SA Wisconsin	—
Meridian Security	—
Patrons Mutual	0.5
RIC	—
Plaza	—
American Compensation	—
Bloomington Compensation	—
Total State Auto Mutual Pooled Companies	35.0	%

21

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

RESULTS OF OPERATIONS

 The following table sets forth certain key performance indicators we use to monitor our operations for the three months ended March 31, 2021 and 2020:

($ millions, except per share amounts)	Three months ended March 31
	2021			2020
GAAP Basis:
Total revenues	$	412.2		$	214.8
Income (loss) before federal income taxes	$	5.6		$	(144.0)
Net income (loss)	$	3.6		$	(114.6)
Basic earnings (loss) per share	$	0.08		$	(2.62)
Diluted earnings (loss) per share	$	0.08		$	(2.62)
Stockholders’ equity	$	972.0		$	866.7
Return on average equity (LTM)	14.3		%	(8.7)		%
Book value per share	$	22.07		$	19.83
Debt to capital ratio	11.2		%	17.4		%
Cat loss and ALAE ratio	20.1		%	12.7		%
Non-cat loss and LAE ratio	58.8		%	59.7		%
Loss and LAE ratio	78.9		%	72.4		%
Expense ratio	34.0		%	34.8		%
Combined ratio	112.9		%	107.2		%
Premium written growth	3.5		%	13.2		%
Investment yield	2.8		%	2.9		%
SAP Basis:
Cat loss and ALAE ratio	20.1		%	12.7		%
Non-cat loss and ALAE ratio	51.5		%	53.6		%
ULAE ratio	7.2		%	6.2		%
Loss and LAE ratio	78.8		%	72.5		%
Expense ratio	33.5		%	34.9		%
Combined ratio	112.3		%	107.4		%

	Twelve months ended March 31
	2021	2020
Net premiums written to surplus	1.6	1.8

First Quarter 2021 Overview:

•For the three months ended March 31, 2021, net investment gain was $38.2 million, which included $31.5 million of gains recognized on equity securities.

•The SAP catastrophe loss and ALAE ratio for the three months ended March 31, 2021 was 20.1%, or $71.6 million. The 2021 first quarter was impacted by winter storms Uri and Viola in Texas, which added 17.0 points to the first quarter loss and ALAE ratio. Approximately 75% of the first quarter 2021 catastrophe losses occurred within homeowners.

•The SAP non-cat loss and ALAE ratio for the three months ended March 31, 2021 was 51.5%, or $183.1 million. Non-catastrophe losses and ALAE included 6.9 points of favorable development relating to prior years, or $24.6 million. For the 2021 first quarter, the commercial insurance segment and personal insurance segment contributed

22

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

$21.8 million and $2.9 million, respectively, of favorable development. The current accident year non-cat loss and ALAE ratio was impacted by (i) non-cat weather losses, primarily wind and hail, and (ii) fire losses.

First Quarter 2020 Overview:

•For the three months ended March 31, 2020, net investment losses were $135.2 million which included $137.8 million of net losses recognized on equity securities and other invested assets. The fair value of our equity securities and other invested assets was adversely affected by the disruption in global financial markets as a result of the COVID-19 pandemic.

•The SAP catastrophe loss and ALAE ratio was 12.7%, or $41.9 million. First quarter 2020 was impacted by a severe wind and hail storm, including tornadoes in Tennessee, that contributed 8.3 points to the first quarter loss and ALAE ratio. Approximately 70% of the catastrophe losses for the quarter occurred within middle market commercial.

•The SAP non-cat loss and ALAE ratio was 53.6%, or $177.1 million. Non-catastrophe losses and ALAE included 3.2 points of favorable development relating to prior years, or $10.5 million, primarily from the commercial insurance segment, which contributed $16.8 million, partially offset by $6.4 million of adverse development from the personal insurance segment. The current accident year non-cat loss and ALAE ratio was impacted by (i) large losses, including fires, and (ii) a lower level of claims attributable to fewer miles driven later in the quarter as a result of compliance with shelter-in-place orders and other actions taken in response to the COVID-19 pandemic.

23

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Insurance Segments

We measure our top-line growth for our insurance segments based on net written premiums, which provides us with an indication of how well we are doing in terms of revenue growth before it is actually earned. Our policies provide a fixed amount of coverage for a stated period of time, often referred to as the “policy term.” As such, our net written premiums are recognized as earned ratably over the policy term. The unearned portion of written premiums, called unearned premiums, is reflected on our balance sheet as a liability and represents our obligation to provide coverage for the unexpired term of the policies.

Insurance industry regulators require our insurance subsidiaries to report their financial condition and results of operations using SAP. We use SAP financial results, along with industry standard financial measures determined on a SAP basis and certain measures determined on a GAAP basis, to internally monitor the performance of our insurance segments and reward our employees.

One of the more significant differences between GAAP and SAP is that SAP requires all underwriting expenses to be expensed immediately and not deferred over the same period that the premium is earned. In converting SAP underwriting results to GAAP underwriting results, acquisition costs are deferred and amortized over the periods the related written premiums are earned. For a discussion of deferred acquisition costs, see “Critical Accounting Policies – Deferred Acquisition Costs” section included in Item 7 of the 2020 Form 10-K.

The accounting for pension benefits also contributes to the difference between our GAAP loss and expense ratios and our SAP loss and expense ratios. For a discussion of our pension and postretirement benefit obligations, see the “Critical Accounting Policies – Pension and Postretirement Benefit Obligations” section included in Item 7 of the 2020 Form 10-K.

All references to financial measures or components thereof in this discussion are calculated on a GAAP basis, unless otherwise noted.

24

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

The following tables set forth certain key performance indicators based on SAP for our insurance segments for the three months ended March 31, 2021 and 2020:

($ in millions)	2021			2020			2021			2020
Three months ended March 31	Personal & Commercial			Personal & Commercial			Total(1)			Total(1)
Net written premiums	$	359.4		$	346.6		$	358.7		$	346.5
Net earned premiums	356.5			330.5			355.9			330.5
Losses and LAE incurred:
Cat loss and ALAE	74.1			41.8			71.6			41.9
Non-cat loss and ALAE
Prior accident years non-cat loss and ALAE	(24.7)			(10.4)			(24.6)			(10.5)
Current accident year non-cat loss and ALAE	207.6			187.5			207.7			187.6
Total non-cat loss and ALAE	182.9			177.1			183.1			177.1
Total Loss and ALAE	257.0			218.9			254.7			219.0
ULAE	25.7			20.6			25.7			20.6
Total Loss and LAE	282.7			239.5			280.4			239.6
Underwriting expenses	120.2			120.7			120.3			121.0
Net underwriting loss	$	(46.4)		$	(29.7)		$	(44.8)		$	(30.1)
Cat loss and ALAE ratio	20.8		%	12.7		%	20.1		%	12.7		%
Non-cat loss and ALAE ratio
Prior accident years non-cat loss and ALAE ratio	(6.9)		%	(3.2)		%	(6.9)		%	(3.2)		%
Current accident year non-cat loss and ALAE ratio	58.2		%	56.8		%	58.4		%	56.8		%
Total non-cat loss and ALAE ratio	51.3		%	53.6		%	51.5		%	53.6		%
Total Loss and ALAE ratio	72.1		%	66.3		%	71.6		%	66.3		%
ULAE ratio	7.2		%	6.2		%	7.2		%	6.2		%
Total Loss and LAE ratio	79.3		%	72.5		%	78.8		%	72.5		%
Expense ratio	33.5		%	34.8		%	33.5		%	34.9		%
Combined ratio	112.8		%	107.3		%	112.3		%	107.4		%
(1)Includes specialty run-off

25

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Personal Insurance Segment

The following tables set forth certain key performance indicators based on SAP by major product line for our personal insurance segment for the three months ended March 31, 2021 and 2020:

Table 1

($ in millions)
Three months ended March 31, 2021	Personal Auto			Homeowners			Other Personal			Total
Net written premiums	$	89.1		$	86.2		$	17.9		$	193.2
Net earned premiums	95.7			96.3			15.8			207.8
Losses and LAE incurred:
Cat loss and ALAE	0.5			52.4			9.6			62.5
Non-cat loss and ALAE
Prior accident years non-cat loss and ALAE	(0.8)			(2.1)			—			(2.9)
Current accident year non-cat loss and ALAE	56.9			55.1			8.1			120.1
Total non-cat loss and ALAE	56.1			53.0			8.1			117.2
Total Loss and ALAE	56.6			105.4			17.7			179.7
ULAE	8.5			8.7			1.2			18.4
Total Loss and LAE	65.1			114.1			18.9			198.1
Underwriting expenses	27.5			26.5			5.1			59.1
Net underwriting gain (loss)	$	3.1		$	(44.3)		$	(8.2)		$	(49.4)
Cat loss and ALAE ratio	0.6		%	54.4		%	60.6		%	30.1		%
Non-cat loss and ALAE ratio
Prior accident years non-cat loss and ALAE ratio	(0.9)		%	(2.2)		%	0.2		%	(1.4)		%
Current accident year non-cat loss and ALAE ratio	59.5		%	57.3		%	51.6		%	57.7		%
Total non-cat loss and ALAE ratio	58.6		%	55.1		%	51.8		%	56.3		%
Total Loss and ALAE ratio	59.2		%	109.5		%	112.4		%	86.4		%
ULAE ratio	8.8		%	9.1		%	7.5		%	8.9		%
Total Loss and LAE ratio	68.0		%	118.6		%	119.9		%	95.3		%
Expense ratio	30.9		%	30.7		%	28.5		%	30.6		%
Combined ratio	98.9		%	149.3		%	148.4		%	125.9		%

26

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Table 2

($ in millions)
Three months ended March 31, 2020	Personal Auto			Homeowners			Other Personal			Total
Net written premiums	$	104.6		$	81.6		$	13.3		$	199.5
Net earned premiums	104.7			82.7			10.7			198.1
Losses and LAE incurred:
Cat loss and ALAE	0.5			10.7			1.5			12.7
Non-cat loss and ALAE
Prior accident years non-cat loss and ALAE	5.2			2.2			(1.0)			6.4
Current accident year non-cat loss and ALAE	62.0			37.6			4.3			103.9
Total non-cat loss and ALAE	67.2			39.8			3.3			110.3
Total Loss and ALAE	67.7			50.5			4.8			123.0
ULAE	7.3			5.3			0.4			13.0
Total Loss and LAE	75.0			55.8			5.2			136.0
Underwriting expenses	32.8			25.0			4.0			61.8
Net underwriting (loss) gain	$	(3.1)		$	1.9		$	1.5		$	0.3
Cat loss and ALAE ratio	0.4		%	13.0		%	14.0		%	6.4		%
Non-cat loss and ALAE ratio
Prior accident years non-cat loss and ALAE ratio	5.0		%	2.7		%	(9.2)		%	3.2		%
Current accident year non-cat loss and ALAE ratio	59.3		%	45.4		%	40.0		%	52.5		%
Total non-cat loss and ALAE ratio	64.3		%	48.1		%	30.8		%	55.7		%
Total Loss and ALAE ratio	64.7		%	61.1		%	44.8		%	62.1		%
ULAE ratio	6.9		%	6.4		%	4.0		%	6.5		%
Total Loss and LAE ratio	71.6		%	67.5		%	48.8		%	68.6		%
Expense ratio	31.4		%	30.6		%	30.0		%	31.0		%
Combined ratio	103.0		%	98.1		%	78.8		%	99.6		%

The personal insurance segment's net written premiums for the three months ended March 31, 2021 decreased 3.2% when compared to the same 2020 period (Tables 1 - 2), driven by a decrease in personal auto net written premiums. The decrease in personal auto net written premiums was driven by a decline in new business, primarily attributable to cumulative rate and underwriting actions taken throughout 2020 to address personal auto profitability. Partially offsetting the decrease in the personal insurance segment's net written premiums was net written premium growth in homeowners and other personal, primarily driven by increased rates.

The personal insurance segment's SAP catastrophe loss and ALAE ratio for the three months ended March 31, 2021 increased 23.7 points when compared to the same 2020 period (Tables 1 - 2), due to winter storms Uri and Viola, which contributed 24.3 points to the personal lines SAP catastrophe loss and ALAE ratio. Approximately 85% of the losses attributable to winter storms Uri and Viola was in our homeowners line of business, and approximately 90% of the personal lines catastrophe losses occurred in Texas.

27

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

The personal insurance segment’s SAP non-catastrophe loss and ALAE ratio for the three months ended March 31, 2021 increased 0.6 points when compared to the same 2020 period (Tables 1 - 2).

The personal auto SAP non-catastrophe loss and ALAE ratio for the three months ended March 31, 2021 improved 5.7 points when compared to the same 2020 period, driven by favorable development of prior accident year losses of 0.9 points compared to adverse development of 5.0 points in the same 2020 period. The first quarter 2021 prior accident year favorable development was driven by favorable development on physical damage coverages, primarily from the 2020 accident year. The first quarter 2020 prior accident year adverse development was driven by higher than expected severity, primarily from the 2019 accident year, for bodily injury, property damage, and personal injury protection, particularly in Michigan.

The homeowners SAP non-catastrophe loss and ALAE ratio for the three months ended March 31, 2021 increased 7.0 points when compared to the same 2020 period. The 2021 increase was primarily driven by higher severity for property claims in the current accident year. Partially offsetting the increase was favorable development of prior accident year losses compared to adverse development in the same 2020 period. The first quarter 2021 favorable development of prior accident year losses was due to lower than expected loss emergence, primarily from the 2020 accident year. The first quarter 2020 prior accident year adverse development was primarily driven by higher severity on fourth quarter 2019 third-party liability and property claims.

28

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Commercial Insurance Segment

The following tables set forth certain key performance indicators based on SAP by major product line for our commercial insurance segment for the three months ended March 31, 2021 and 2020:

Table 3

($ in millions)
Three months ended March 31, 2021	Commercial Auto			Small Commercial Package			Middle Market Commercial			Workers' Comp			Farm & Ranch			Other Commercial			Total
Net written premiums	$	51.3		$	35.0		$	39.3		$	16.0		$	19.9		$	4.7		$	166.2
Net earned premiums	40.9			31.7			39.6			15.2			16.5			4.8			148.7
Losses and LAE incurred:
Cat loss and ALAE	0.2			5.2			3.0			—			3.2			—			11.6
Non-cat loss and ALAE
Prior accident years non-cat loss and ALAE	(0.6)			(2.2)			(8.1)			(8.5)			(1.4)			(1.0)			(21.8)
Current accident year non-cat loss and ALAE	25.4			19.8			25.6			9.3			5.5			1.9			87.5
Total non-cat loss and ALAE	24.8			17.6			17.5			0.8			4.1			0.9			65.7
Total Loss and ALAE	25.0			22.8			20.5			0.8			7.3			0.9			77.3
ULAE	2.6			2.4			0.8			0.7			0.7			0.1			7.3
Total Loss and LAE	27.6			25.2			21.3			1.5			8.0			1.0			84.6
Underwriting expenses	16.1			11.5			16.2			7.5			8.0			1.8			61.1
Net underwriting (loss) gain	$	(2.8)		$	(5.0)		$	2.1		$	6.2		$	0.5		$	2.0		$	3.0
Cat loss and ALAE ratio	0.3		%	16.5		%	7.6		%	—		%	19.7		%	—		%	7.8		%
Non-cat loss and ALAE ratio
Prior accident years non-cat loss and ALAE ratio	(1.5)		%	(7.0)		%	(20.3)		%	(55.8)		%	(8.3)		%	(20.8)		%	(14.6)		%
Current accident year non-cat loss and ALAE ratio	62.1		%	62.6		%	64.6		%	60.7		%	33.4		%	38.7		%	58.8		%
Total non-cat loss and ALAE ratio	60.6		%	55.6		%	44.3		%	4.9		%	25.1		%	17.9		%	44.2		%
Total Loss and ALAE ratio	60.9		%	72.1		%	51.9		%	4.9		%	44.8		%	17.9		%	52.0		%
ULAE ratio	6.3		%	7.4		%	2.0		%	4.9		%	4.1		%	2.8		%	4.9		%
Total Loss and LAE ratio	67.2		%	79.5		%	53.9		%	9.8		%	48.9		%	20.7		%	56.9		%
Expense ratio	31.6		%	32.8		%	41.2		%	46.9		%	39.9		%	39.0		%	36.8		%
Combined ratio	98.8		%	112.3		%	95.1		%	56.7		%	88.8		%	59.7		%	93.7		%

29

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Table 4

($ in millions)
Three months ended March 31, 2020	Commercial Auto			Small Commercial Package			Middle Market Commercial			Workers' Comp			Farm & Ranch			Other Commercial			Total
Net written premiums	$	36.4		$	31.9		$	40.3		$	18.8		$	14.8		$	4.9		$	147.1
Net earned premiums	29.0			30.3			36.1			19.7			12.6			4.7			132.4
Losses and LAE incurred:
Cat loss and ALAE	0.3			3.6			24.1			—			0.9			0.2			29.1
Non-cat loss and ALAE
Prior accident years non-cat loss and ALAE	(0.1)			(5.4)			(5.1)			(4.0)			(0.8)			(1.4)			(16.8)
Current accident year non-cat loss and ALAE	16.6			19.1			27.5			13.4			4.0			3.0			83.6
Total non-cat loss and ALAE	16.5			13.7			22.4			9.4			3.2			1.6			66.8
Total Loss and ALAE	16.8			17.3			46.5			9.4			4.1			1.8			95.9
ULAE	1.5			1.6			2.1			1.7			0.5			0.2			7.6
Total Loss and LAE	18.3			18.9			48.6			11.1			4.6			2.0			103.5
Underwriting expenses	12.7			11.8			16.7			8.9			6.7			2.1			58.9
Net underwriting (loss) gain	$	(2.0)		$	(0.4)		$	(29.2)		$	(0.3)		$	1.3		$	0.6		$	(30.0)
Cat loss and ALAE ratio	1.1		%	12.0		%	66.7		%	—		%	7.3		%	3.8		%	22.0		%
Non-cat loss and ALAE ratio
Prior accident years non-cat loss and ALAE ratio	(0.3)		%	(17.8)		%	(14.2)		%	(20.5)		%	(6.4)		%	(29.9)		%	(12.7)		%
Current accident year non-cat loss and ALAE ratio	57.2		%	62.8		%	76.4		%	68.2		%	31.6		%	63.9		%	63.1		%
Total non-cat loss and ALAE ratio	56.9		%	45.0		%	62.2		%	47.7		%	25.2		%	34.0		%	50.4		%
Total Loss and ALAE ratio	58.0		%	57.0		%	128.9		%	47.7		%	32.5		%	37.8		%	72.4		%
ULAE ratio	5.2		%	5.3		%	5.8		%	8.9		%	3.9		%	4.0		%	5.8		%
Total Loss and LAE ratio	63.2		%	62.3		%	134.7		%	56.6		%	36.4		%	41.8		%	78.2		%
Expense ratio	35.0		%	37.0		%	41.4		%	47.7		%	45.5		%	41.7		%	40.1		%
Combined ratio	98.2		%	99.3		%	176.1		%	104.3		%	81.9		%	83.5		%	118.3		%

Commercial auto and small commercial package new business has been written on State Auto Connect since 2018. Our farm and ranch product launched on State Auto Connect during the first quarter of 2020 and is now live in 29 states. Nine of the 29 states are states that we previously were not writing policies for farm & ranch products. Our middle market commercial product launched on State Auto Connect in March 2020 and is currently live in 30 states after completing the launch in the last state in April 2021. Finally, our workers' compensation product launched on State Auto Connect in the fourth quarter of 2020 and is currently live in 16 states as of April 2021 with subsequent state rollouts scheduled throughout 2021.

The commercial insurance segment's net written premiums for the three months ended March 31, 2021, increased 13.0%, when compared to the same 2020 period (Tables 3 - 4), primarily driven by (i) new business growth and rate increases in commercial auto and small commercial package, and (ii) new business growth in farm & ranch. The net written premium growth was partially offset by a decrease in net written premiums in workers’ compensation due to our 2020 decision to not renew and no longer write nursing home business, and a decrease in net written premiums in middle market commercial due to a decline in new business.

30

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

The commercial insurance segment's SAP catastrophe loss and ALAE ratio for the three months ended March 31, 2021 improved 14.2 points when compared to the same 2020 period (Tables 3 - 4). While the number of catastrophe events increased compared to 2020, the 2021 catastrophe events were less severe. During the first quarter 2021, winter storms Uri and Viola contributed 6.7 points to the loss and ALAE ratio. Approximately 60% of the first quarter 2021 catastrophe losses occurred in Texas. During the first quarter 2020, a wind and hail storm, including tornadoes, in Tennessee contributed 19.0 points to the first quarter loss and ALAE ratio, of which 11.4 points were from three large losses in Nashville.

The commercial insurance segment’s SAP non-catastrophe loss and ALAE ratio for the three months ended March 31, 2021 improved 6.2 points when compared to the same 2020 period (Tables 3 - 4).

The commercial auto SAP non-catastrophe loss and ALAE ratio for the three months ended March 31, 2021 increased 3.7 points when compared to the same 2020 period, driven by an increase in the current accident year ratio. The 2021 current accident year was impacted by higher bodily injury and uninsured motorist claims frequency when compared to 2020. Partially offsetting the increase was greater favorable development of prior accident year losses when compared to the same 2020 period. The 2021 prior accident year favorable development was due to lower than anticipated bodily injury and uninsured motorist claims severity from the 2019 accident year

The small commercial package SAP non-catastrophe loss and ALAE ratio for the three months ended March 31, 2021 increased 10.6 points when compared to the same 2020 period, primarily due to less favorable development of prior accident year losses. The 2021 favorable development was attributable to lower than anticipated bodily injury severity from multiple accident years, partially offset by adverse development on several large property claims from the 2020 accident year. The 2020 favorable development was primarily attributable to lower than expected bodily injury severity from multiple accident years.

The middle market commercial SAP non-catastrophe loss and ALAE ratio for the three months ended March 31, 2021 improved 17.9 points when compared to the same 2020 period, primarily due to (i) improvement in the current accident year ratio due to reduced business activity in response to COVID-19, and (ii) greater favorable development of prior accident year losses, primarily driven by favorable development on bodily injury claims from multiple accident years and on large fire claims from the 2020 accident year. The 2020 favorable development of prior accident year losses was primarily attributable to lower than expected bodily injury severity from multiple accident years.

The workers' compensation SAP non-catastrophe loss and ALAE ratio for the three months ended March 31, 2021 improved 42.8 points when compared to the same 2020 period, primarily due to (i) greater favorable development of prior accident year losses across multiple accident years and (ii) lower claim severity in the current accident year when compared 2020.

31

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Losses and LAE Development

Losses and loss expenses represent the combined estimated ultimate liability for claims occurring in a period, along with any change in the estimated ultimate liability for claims occurring in prior periods.

The following table sets forth a tabular presentation of the development of the prior accident years' ultimate liability by product for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020		Change
	(Favorable)/Adverse
Non-cat loss and ALAE:
Personal Insurance Segment:
Personal Auto	$	(0.8)	$	5.2	$	(6.0)
Homeowners	(2.1)		2.2		(4.3)
Other Personal	—		(1.0)		1.0
Total Personal Insurance Segment	(2.9)		6.4		(9.3)
Commercial Insurance Segment:
Commercial Auto	(0.6)		(0.1)		(0.5)
Small Commercial Package	(2.2)		(5.4)		3.2
Middle Market Commercial	(8.1)		(5.1)		(3.0)
Workers' Compensation	(8.5)		(4.0)		(4.5)
Farm & Ranch	(1.4)		(0.8)		(0.6)
Other Commercial	(1.0)		(1.4)		0.4
Total Commercial Insurance Segment	(21.8)		(16.8)		(5.0)
Specialty run-off	0.1		(0.1)		0.2
Cat Loss and ALAE	(3.8)		0.3		(4.1)
ULAE	(2.1)		2.7		(4.8)
Total	$	(30.5)	$	(7.5)	$	(23.0)

For further information, see the "Personal Insurance Segment" and "Commercial Insurance Segment" discussions included in this Item 2.

32

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Losses and loss expenses payable

The following table sets forth losses and loss expenses payable by major product at March 31, 2021 and December 31, 2020:

($ millions)	March 31, 2021		December 31, 2020		$ Change
Personal Insurance Segment:
Personal Auto	$	170.5	$	174.4	$	(3.9)
Homeowners	124.2		90.4		33.8
Other Personal	19.8		15.8		4.0
Total Personal Insurance Segment	314.5		280.6		33.9
Commercial Insurance Segment:
Commercial Auto	101.7		93.8		7.9
Small Commercial Package	100.4		95.9		4.5
Middle Market Commercial	162.5		162.2		0.3
Workers’ Compensation	163.9		176.4		(12.5)
Farm & Ranch	20.2		18.3		1.9
Other Commercial	26.3		25.6		0.7
Total Commercial Insurance Segment	575.0		572.2		2.8
Specialty run-off:
E&S Property	17.4		24.3		(6.9)
E&S Casualty	102.2		112.2		(10.0)
Programs	33.6		36.8		(3.2)
Total Specialty run-off	153.2		173.3		(20.1)
Total losses and loss expenses payable, net of reinsurance recoverable on losses and loss expenses payable and allowance for credit losses	$	1,042.7	$	1,026.1	$	16.6

Losses and loss expenses payable increased $16.6 million since December 31, 2020 primarily due to a higher level of catastrophe losses in the personal insurance segment discussed above, partially offset by the run-off from our previously exited specialty insurance business.

We conduct quarterly reviews of loss development and make judgments in determining the reserves for losses and loss expenses. Several factors are considered by us when estimating ultimate liabilities, including consistency in relative case reserve adequacy, consistency in claims settlement practices, recent legal developments, historical data, actuarial projections, exposure changes, anticipated inflation, current business conditions, catastrophe development, late reported claims, and other reasonableness tests. Our quarterly review also included the potential impact of COVID-19 on our reserves for losses and loss expenses. For a discussion of the most significant risks and uncertainties that could impact our results of operations, financial position, liquidity, and cash flows as a result of the COVID-19 pandemic, see "Risk Factors" in “Item 1A” of the 2020 Form 10-K.

The risks and uncertainties inherent in our estimates include, but are not limited to, actual settlement experience differing from historical data, trends, changes in business and economic conditions, court decisions creating unanticipated liabilities, ongoing interpretation of policy provisions by the courts, inconsistent decisions in lawsuits regarding coverage and additional information discovered before settlement of claims. Our results of operations and financial condition could be impacted, perhaps significantly, in the future if the ultimate payments required for claims settlement vary from the liability currently recorded. For a discussion of our reserving methodologies, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Policies – Losses and Loss Expenses Payable” in Item 7 of the 2020 Form 10-K.

33

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Acquisition and Operating Expenses

Our GAAP acquisition and operating expenses for the three months ended March 31, 2021 was $121.0 million compared to $114.9 million for the same 2020 period. The increase in acquisition and operating expenses was driven by an increase in (i) estimated variable associate compensation and (ii) amortization of deferred acquisition costs.

Investment Operations Segment

Our investments in fixed maturities, equity securities and certain other invested assets are carried at fair value. The unrealized holding gains or losses of our available-for-sale fixed maturities, net of applicable deferred taxes, are included as a separate component of stockholders’ equity as accumulated other comprehensive income and as such are not included in the determination of net income.

We have investment policy guidelines with respect to purchasing fixed maturity investments for our insurance subsidiaries which preclude investments in bonds that are rated below investment grade by a recognized rating service at the time of purchase. Our fixed maturity portfolio is composed of high quality, investment grade issues, consisting primarily of debt issues rated AAA, AA or A. We obtain investment ratings from major rating services. If there is a split rating, we assign the lowest rating obtained.

For further discussion regarding the management of our investment portfolio, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Results of Operations – Investment Operations Segment” in Item 7 of the 2020 Form 10-K.

Composition of Investment Portfolio

The following table sets forth the composition of our investment portfolio at carrying value at March 31, 2021 and December 31, 2020:

($ millions)	March 31, 2021		% of Total		December 31, 2020		% of Total
Cash and cash equivalents	$	59.1	2.1	%	$	90.7	3.2	%
Fixed maturities, at fair value:
Fixed maturities	2,104.3		74.5	%	2,121.0		73.9	%
Treasury inflation-protected securities	104.7		3.7	%	116.2		4.0	%
Total fixed maturities	2,209.0		78.2	%	2,237.2		77.9	%
Notes receivable from affiliate	70.0		2.5	%	70.0		2.4	%
Equity securities:
Large-cap securities	149.2		5.2	%	134.2		4.7	%
Mutual and exchange traded funds	250.4		8.9	%	255.5		8.9	%
Total equity securities	399.6		14.1	%	389.7		13.6	%
Other invested assets:
International funds	60.6		2.1	%	55.8		2.0	%
Other invested assets	15.8		0.6	%	15.3		0.5	%
Total other invested assets	76.4		2.7	%	71.1		2.5	%
Other invested assets, at cost	11.8		0.4	%	12.1		0.4	%
Total portfolio	$	2,825.9	100.0	%	$	2,870.8	100.0	%

34

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

The following table sets forth the amortized cost and fair value of available-for-sale fixed maturities by contractual maturity at March 31, 2021:

($ millions)	Amortized cost		Fair value
Due in 1 year or less	$	158.5	$	159.7
Due after 1 year through 5 years	536.7		562.2
Due after 5 years through 10 years	165.9		170.5
Due after 10 years	556.1		582.3
U.S. government agencies mortgage-backed securities	730.3		734.3
Total	$	2,147.5	$	2,209.0

Expected maturities may differ from contractual maturities as the issuers may have the right to call or prepay the obligations with or without call or prepayment penalties. The duration of the fixed maturity portfolio was approximately 4.60 and 4.72 as of March 31, 2021, and December 31, 2020, respectively.

Investment Operations Revenue

The following table sets forth the components of net investment income for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021			2020
Gross investment income:
Fixed maturities	$	15.4		$	15.1
Equity securities	1.6			3.1
Other	0.9			1.0
Total gross investment income	17.9			19.2
Less: Investment expenses	0.3			0.3
Net investment income	$	17.6		$	18.9
Average invested assets (at cost)	$	2,531.3		$	2,623.9
Annualized investment yield	2.8		%	2.9		%
Annualized investment yield, after tax	2.3		%	2.4		%
Net investment income, after tax	$	14.6		$	15.6
Effective tax rate	17.4		%	17.2		%

When a fixed maturity has been determined to have an impairment, the impairment charge representing the credit loss is recognized in earnings as a realized loss and on the balance sheet as an allowance for credit losses netted with the amortized cost of fixed maturities. Future increases in fair value, if related to credit factors, are recognized through earnings limited to the amount previously recognized as an allowance for credit losses. The amount related to non-credit factors is recognized in accumulated other comprehensive income and future increases or decreases in fair value, if not credit losses, are included in accumulated other comprehensive (loss) income. We reviewed our available-for-sale fixed maturities at March 31, 2021 and 2020 and determined that no credit impairment existed in the gross unrealized holding losses. See Note 3, “Investments” to our condensed consolidated financial statements included in Item 1 of this Form 10-Q for additional information.

35

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Gross Unrealized Investment Gains and Losses

Based upon our review of our investment portfolio at March 31, 2021, we determined that there were no individual investments with an unrealized holding loss that had a fair value significantly below cost continually for more than one year. The following table sets forth detailed information on our investment portfolio by investment category at fair value for our gross unrealized holding gains (losses) at March 31, 2021:

($ millions)	Cost or amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Fair value
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	448.4	$	23.0	$	(0.4)	$	471.0
Obligations of states and political subdivisions	480.4		22.0		(1.9)		500.5
Corporate securities	488.4		17.0		(2.2)		503.2
U.S. government agencies mortgage-backed securities	730.3		15.4		(11.4)		734.3
Total available-for-sale fixed maturities	$	2,147.5	$	77.4	$	(15.9)	$	2,209.0

The following table sets forth our unrealized holding gains for our available-for-sale fixed maturities, net of deferred tax that was included as a component of accumulated other comprehensive loss at March 31, 2021, and December 31, 2020, and the change in unrealized holding gains, net of deferred tax, for the three months ended March 31, 2021:

($ millions)	March 31, 2021		December 31, 2020		$ Change
Available-for-sale investments:
Unrealized holding gains:
Fixed maturities	$	61.5	$	120.2	$	(58.7)
Net deferred federal income tax	(12.9)		(25.3)		12.4
Unrealized gains, net of tax	$	48.6	$	94.9	$	(46.3)

At March 31, 2021, State Auto P&C had U.S. government agencies mortgage-backed fixed maturity securities with a carrying value of approximately $106.5 million pledged as collateral for loans from the FHLB. See “Liquidity and Capital Resources - Borrowing Arrangements - FHLB Loans” in this Item 2 for a further description of these loans. In accordance with the terms of the FHLB loans, State Auto P&C retains all rights regarding these pledged securities.

Fair Value Measurements

We primarily use one independent nationally recognized third party pricing service in developing fair value estimates. We obtain one price per security, and our processes and control procedures are designed to ensure the value is accurately recorded on an unadjusted basis. Through discussions with the pricing service, we gain an understanding of the methodologies used to price the different types of securities, that the data and the valuation methods utilized are appropriate and consistently applied, and that the assumptions are reasonable and representative of fair value. To validate the reasonableness of the valuations obtained from the pricing service, we compare to other fair value pricing information gathered from other independent pricing sources. See Note 4, “Fair Value of Financial Instruments” to our condensed consolidated financial statements included in Item 1 of this Form 10-Q for a presentation of our available-for-sale investments within the fair value hierarchy at March 31, 2021, and December 31, 2020.

36

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

LIQUIDITY AND CAPITAL RESOURCES

General

Liquidity refers to our ability to generate adequate amounts of cash to meet our short- and long-term needs. Our primary sources of cash are premiums, investment income, investment sales and the maturity of fixed income security investments. The significant outflows of cash are payments of claims, commissions, premium taxes, operating expenses, income taxes, dividends, interest and principal payments on debt and investment purchases. The cash outflows may vary due to uncertainties regarding settlement of large losses or catastrophic events. As a result, we continually monitor our investment and reinsurance programs to ensure they are appropriately structured to enable the insurance subsidiaries to meet anticipated short-term and long-term cash requirements without the need to sell investments to meet fluctuations in claim payments.

Liquidity

Our insurance subsidiaries must have adequate liquidity to ensure that their cash obligations are met. However, as discussed below, the STFC Pooled Companies do not have the day-to-day liquidity concerns normally associated with an insurance company due to their participation in, and the terms of, the Pooling Arrangement. In addition, State Auto P&C has a $100.0 million line of credit in place with the FHLB available for general corporate purposes such as funding liquidity needs. See “Borrowing Arrangements - FHLB Loans” described below.

Under the terms of the Pooling Arrangement, each period State Auto Mutual collects all premiums from policyholders and pays all losses and expenses associated with the insurance business produced by the STFC Pooled Companies and the other pool participants, and then it settles the intercompany balances generated by these transactions with the pool participants within 60 days following each quarter end. We believe this provides State Auto Mutual with sufficient liquidity to pay losses and expenses of our insurance operations on a timely basis.

We are exposed to third-party credit risk both directly through its cessions to reinsurers and indirectly through its participation in the Pooling Arrangement. In addition to exposure to credit risk on reinsurance recoverables, we are also exposed to credit risk on amounts due from insureds and agents. When settling the intercompany balances, State Auto Mutual provides the STFC Pooled Companies with full credit for the net premiums written and net losses paid during the quarter.

While the total amount due to State Auto Mutual from policyholders and agents is significant, the individual amounts due are relatively small at the policyholder and agency level. The State Auto Group mitigates its exposure to this credit risk through its in-house collections unit for both personal and commercial accounts which is supplemented by third party collection service providers. In addition to reliance upon recent and historical collection trends, determination of the allowance for uncollectible premiums receivable at March 31, 2021 included consideration of other factors, including macro-economic conditions and trends, in particular the estimated impact of COVID-19. Credit risk is partially mitigated by the State Auto Group's ability to cancel the policy if the policyholder does not pay the premium. Pursuant to the Pooling Arrangement, bad debt expense for uncollectible premiums for the pool is allocated to pool members on the basis of pool participation and is included in the quarterly settlement of intercompany balances. This is included in "other expenses" on the condensed consolidated statements of income and reflected in “due to/from affiliates” on our condensed consolidated balance sheets.

We generally manage our cash flows through current operational activity and maturing investments, without a need to liquidate any of our other investments; however, should our written premiums decline or paid losses increase significantly, or a combination thereof, we may need to liquidate investments at losses in order to meet our cash obligations. This action was not necessary for the three months ended March 31, 2021.

We maintain a portion of our investment portfolio in relatively short-term and highly liquid investments to ensure the immediate availability of funds to pay claims and expenses. At March 31, 2021, and December 31, 2020, we had $59.1 million and $90.7 million, respectively, in cash and cash equivalents, and $2,685.0 million and $2,698.0 million, respectively, of total investments. Our available-for-sale fixed maturities included $9.4 million and $9.7 million of securities on deposit with insurance regulators as required by law at March 31, 2021, and December 31, 2020; in addition, substantially all of our fixed maturity and equity securities are traded on public markets. For a further discussion regarding investments, see “Investments Operations Segment” included in this Item 2.

Cash used in operating activities was $18.9 million and $28.0 million for the three months ended March 31, 2021 and 2020, respectively. Net cash from operations will vary from period to period if there are significant changes in underwriting results, primarily the level of premiums written or loss and loss expenses paid, and in cash flows from investment income or federal income taxes paid.

Cash used in investing activities was $9.0 million and cash provided by investing activities was $20.1 million for the three months ended March 31, 2021 and 2020, respectively. The change was primarily driven by an increase in the purchase of

37

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

fixed maturities, partially offset by an increase in the maturities of fixed maturities and the sale of fixed maturities and equity securities.

Cash used in financing activities was $3.7 million and cash provided by financing activities was $56.5 million for the three months ended March 31, 2021 and 2020, respectively. The change was primarily driven by proceeds from the FHLB REPO loan in 2020.

Borrowing Arrangements

FHLB Line of Credit

As of March 31, 2021, State Auto P&C had an Open Line of Credit Commitment (the "Prior OLC") with the FHLB that provided it with a $100.0 million open line of credit available for general corporate purposes. As of March 31, 2021, no advances had been made under the Prior OLC. The Prior OLC matured on April 2, 2021, and on that date, State Auto P&C entered into a new Open Line of Credit Commitment (the “New OLC”) with the FHLB that provides it with a $100.0 million one-year open line of credit available for general corporate purposes. Draws under the New OLC are to be funded with a daily variable rate advance with a term of no more than 180 days with interest payable monthly. All advances under the New OLC are fully secured by a pledge of specific investment securities of State Auto P&C.

FHLB Loans

State Auto P&C has a term loan with the FHLB in the amount of $21.5 million (the “2020 FHLB Loan”). The 2020 FHLB Loan Matures in September of 2030 and provides for interest-only payments during its term, with principal due in full at maturity, and may be prepaid without penalty after five years and each of the succeeding six months thereafter. The interest rate is fixed over the term of the loan at 1.37%. The 2020 FHLB Loan is fully secured by a pledge of specific investment securities of State Auto P&C.

State Auto P&C also has an outstanding term loan with the FHLB in the principal amount of $85.0 million (the "2018 FHLB Loan"). The 2018 FHLB Loan matures in May 2033 and provides for interest-only payments during its term, with principal due in full at maturity. The interest rate is fixed over the term of the loan at 3.96%. Prepayment of the 2018 FHLB Loan would require a prepayment fee. The 2018 FHLB Loan is fully secured by a pledge of specific investment securities of State Auto P&C.

Subordinated Debentures

State Auto Financial’s Delaware business trust subsidiary (the “Capital Trust”) has outstanding $15.0 million liquidation amount of capital securities, due 2033. In connection with the Capital Trust’s issuance of the capital securities and the related purchase by State Auto Financial of all of the Capital Trust’s common securities (liquidation amount of $0.5 million), State Auto Financial has issued to the Capital Trust $15.5 million aggregate principal amount of unsecured Floating Rate Junior Subordinated Debt Securities due 2033 (the “Subordinated Debentures”). The sole assets of the Capital Trust are the Subordinated Debentures and any interest accrued thereon. Interest on the Capital Trust’s capital and common securities is payable quarterly at a rate equal to the three-month LIBOR rate plus 4.20%, adjusted quarterly. The applicable interest rates for March 31, 2021, and 2020 were 4.39% and 5.78%, respectively.

Reinsurance Arrangements

Members of the State Auto Group follow the customary industry practice of reinsuring a portion of their exposures and paying to the reinsurers a portion of the premiums received. Insurance is ceded principally to reduce net liability on individual risks or for individual loss occurrences, including catastrophic losses. Although reinsurance does not legally discharge the individual members of the State Auto Group from primary liability for the full amount of limits applicable under their policies, it does make the assuming reinsurer liable to the extent of the reinsurance ceded.

To minimize the risk of reinsurer default, the State Auto Group cedes only to third-party reinsurers who are rated A- or better by A.M. Best or Standard & Poor’s and also utilizes both domestic and international markets to diversify its credit risk. We utilize reinsurance to limit our loss exposure and contribute to our liquidity and capital resources.

38

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Other Reinsurance Arrangements

Each member of the State Auto Group is party to working reinsurance treaties for casualty, workers’ compensation and property lines with several reinsurers arranged through reinsurance intermediaries. These agreements are described in more detail below. We have also secured other reinsurance to limit the net cost of large loss events for certain types of coverage. The State Auto Group also makes use of facultative reinsurance for unique risk situations. The State Auto Group also participates in state insurance pools and associations. In general, these pools and associations are state sponsored and/or operated, impose mandatory participation by insurers doing business in that state, and offer coverage for hard-to-place risks at rates established by the state sponsor or operator, thereby transferring risk of loss to the participating insurers in exchange for premiums which may not be commensurate with the risk assumed.

Adverse Development Cover

The State Auto Group has an adverse development reinsurance agreement implemented at the end of 2014, providing $40.0 million of coverage for adverse claims development in excess of carried reserves as of November 30, 2014 for the terminated restaurant program business previously underwritten by a MGU-subsidiary of State Auto Mutual.

Property Catastrophe Treaty

Members of the State Auto Group maintain a property catastrophe excess of loss reinsurance agreement, covering property catastrophe related events affecting at least two risks. This property catastrophe reinsurance agreement renewed as of July 1, 2020. Under this reinsurance agreement, we retain the first $90.0 million of catastrophe loss, each occurrence, with a 5.0% co-participation on the next $180.0 million of covered loss, each occurrence which is broken down into two layers of $70.0 million and $110.0 million. The reinsurers are responsible for 95.0% of the catastrophe losses excess of $90.0 million up to $270.0 million, each occurrence. The State Auto Group is responsible for catastrophe losses above $270.0 million. There is also an automatic restatement of the limit, for 100% of the deposit premium.

Property Per Risk Treaty

As of April 1, 2020, the State Auto Group renewed the property per risk excess of loss reinsurance agreement for a 15-month term. Under this reinsurance agreement, the State Auto Group retains the first $4.0 million of covered loss, with a 19.5% co-participation on the next $6.0 million of covered loss and a 14.0% co-participation on covered loss between $10.0 million and $20.0 million. The reinsurers are responsible for 80.5% of the loss excess of the $4.0 million retention up to $10.0 million and 86.0% of the loss excess of $10 million up to $20.0 million.

Casualty and Workers' Compensation Treaties

As of July 1, 2020, the State Auto Group renewed the casualty excess of loss reinsurance agreement. Under this reinsurance agreement, the State Auto Group is responsible for the first $3.0 million of losses that involve workers' compensation, auto liability, other liability and umbrella liability policies. This reinsurance agreement provides coverage up to $10.0 million, except for commercial umbrella policies which are covered for limits up to $15.0 million.

Also, certain unusual claim situations involving extra contractual obligations, excess of policy limits, LAE coverage and multiple policy or coverage loss occurrences arising from bodily injury liability, property damage, uninsured motorist and personal injury protection are covered by a Clash reinsurance agreement that provides for $20.0 million of coverage in excess of $10.0 million retention for each loss occurrence. This Clash reinsurance coverage sits above the $7.0 million excess of $3.0 million arrangement.

In addition, each company in the State Auto Group is party to a workers’ compensation catastrophe insurance agreement that provides additional reinsurance coverage for workers’ compensation losses involving multiple workers. Subject to $10.0 million of retention, reinsurers are responsible for 100.0% of the excess over $10.0 million up to $30.0 million of covered loss. For loss amounts over $30.0 million, the casualty excess of loss reinsurance agreement provides $20.0 million coverage in excess of $30.0 million. Workers’ compensation catastrophe coverage is subject to a “Maximum Any One Life” limitation of $10.0 million. This limitation means that losses associated with each worker may contribute no more than $10.0 million to covered loss under these agreements.

Regulatory Considerations

At March 31, 2021, all of our insurance subsidiaries were in compliance with statutory requirements relating to capital adequacy.

39

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

ADOPTION OF RECENT ACCOUNTING PRONOUNCEMENTS

For information on this topic, see Note 1 of our condensed consolidated financial statements included in Item 1 of this Form 10-Q.

CREDIT AND FINANCIAL STRENGTH RATINGS

On July 16, 2020, A.M. Best affirmed the State Auto Group’s financial strength rating of A- (Excellent) with a stable outlook.

MARKET RISK

With respect to Market Risk, see the discussion regarding this subject at “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Investment Operations Segment – Market Risk” in Item 7 of the 2020 Form 10-K. There have been no material changes from the information reported regarding Market Risk in the 2020 Form 10-K.

40

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Item 3. Quantitative and Qualitative Disclosure of Market Risk

The information called for by this item is provided in this Form 10-Q under the caption “Market Risk” under Item 2 – Management’s Discussion and Analysis of Financial Condition and Results of Operations.

41

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Item 4. Controls and Procedures

Disclosure Controls and Procedures

With the participation of our principal executive officer and principal financial officer, our management has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), as of the end of the period covered by this report. Based upon that evaluation, our principal executive officer and principal financial officer have concluded that, as of the end of the period covered by this report:

1.Information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the Securities and Exchange Commission;

2.Information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure; and

3.Our disclosure controls and procedures are effective in timely making known to them material information required to be included in our periodic filings with the Securities and Exchange Commission.

Changes in Internal Control over Financial Reporting

There has been no change in our internal controls over financial reporting that occurred during the most recent fiscal quarter that has materially affected, nor is it likely to materially affect, our internal control over financial reporting.

42

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

PART II – OTHER INFORMATION

Item 1. Legal Proceedings

None.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

None.

43

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

Item 6. Exhibits

Exhibit No.	Description of Exhibits
31.01	CEO certification required by Section 302 of Sarbanes Oxley Act of 2002
31.02	CFO certification required by Section 302 of Sarbanes Oxley Act of 2002
32.01	CEO certification required by Section 906 of Sarbanes Oxley Act of 2002
32.02	CFO certification required by Section 906 of Sarbanes Oxley Act of 2002
101.INS	The instance document does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document
101.SCH	Inline XBRL Taxonomy Extension Schema Document
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	Inline XBRL Taxonomy Definition Linkbase Document
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

44

STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES

(a majority-owned subsidiary of State Automobile Mutual Insurance Company)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	State Auto Financial Corporation
Date: May 7, 2021	/s/ Steven E. English
	Steven E. English
	Chief Financial Officer
	(Duly Authorized Officer and
	Principal Financial Officer)

45

EX-31.01

Exhibit 31.01

CERTIFICATION

I, Michael E. LaRocco, certify that:

1.    I have reviewed this Form 10-Q of State Auto Financial Corporation;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.     The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 7, 2021	/s/ Michael E. LaRocco
	Michael E. LaRocco, Chief Executive Officer
	(Principal executive officer)

EX-31.02

Exhibit 31.02

CERTIFICATION

I, Steven E. English, certify that:

1.    I have reviewed this Form 10-Q of State Auto Financial Corporation;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.     The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 7, 2021	/s/ Steven E. English
	Steven E. English, Chief Financial Officer
	(Principal financial officer)

EX-32.01

Exhibit 32.01

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of State Auto Financial Corporation (the “Company”) on Form 10-Q for the period ending March 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael E. LaRocco, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Michael E. LaRocco

Michael E. LaRocco

Chief Executive Officer

May 7, 2021

A signed original of this written statement required by Section 906 has been provided to State Auto Financial Corporation and will be retained by State Auto Financial Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.02

Exhibit 32.02

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of State Auto Financial Corporation (the “Company”) on Form 10-Q for the period ending March 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven E. English, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Steven E. English

Steven E. English

Chief Financial Officer

May 7, 2021

A signed original of this written statement required by Section 906 has been provided to State Auto Financial Corporation and will be retained by State Auto Financial Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

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Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	000-19289
Entity Registrant Name	STATE AUTO FINANCIAL CORPORATION
Entity Central Index Key	0000874977
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	31-1324304
Entity Address, Address Line One	518 East Broad Street
Entity Address, State or Province	OH
Entity Address, City or Town	Columbus
Entity Address, Postal Zip Code	43215-3976
City Area Code	614
Local Phone Number	464-5000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding (shares)		44,051,645
NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]
Entity Information [Line Items]
Title of 12(b) Security	Common shares, without par value
Trading Symbol	STFC
Security Exchange Name	NASDAQ

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Basis of Presentation

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements of State Auto Financial Corporation and Subsidiaries (“State Auto Financial” or the “Company”) have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. In the opinion of the Company, all adjustments (consisting of normal, recurring accruals) considered necessary for a fair statement have been included. Operating results for the three months ended March 31, 2021, are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The balance sheet at December 31, 2020, has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements.

For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the “2020 Form 10-K”). Capitalized terms used herein and not otherwise defined shall have the meaning ascribed to them in the 2020 Form 10-K.

Adoption of Recent Accounting Pronouncements

Income Taxes - Simplifying the Accounting for Income Taxes

In December 2019, the FASB issued ASU 2019-12 which updated guidance for the accounting for income taxes. The updated guidance is intended to simplify the accounting for income taxes by removing several exceptions contained in existing guidance and amending other existing guidance to simplify several other income tax accounting matters. The guidance became effective for annual and interim reporting periods after December 15, 2020 and did not have a material impact on the Company's results of operations, consolidated financial position or cash flows.

Pending Adoption of Recent Accounting Pronouncements

For information regarding other accounting pronouncements that the Company has not yet adopted, see the “Pending Adoption of Recent Accounting Pronouncements” section of Note 1 of the Notes to Consolidated Financial Statements in the 2020 Form 10-K.

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Contingencies and Litigation

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Contingencies and Litigation

Contingencies and LitigationIn accordance with the Contingencies Topic of the FASB's Accounting Standards Codification, the Company accrues for a litigation-related liability when it is probable that such a liability has been incurred and the amount can be reasonably

estimated. The Company reviews all litigation on an ongoing basis when making accrual and disclosure decisions. For certain legal proceedings, the Company cannot reasonably estimate a loss or a range of loss, if any, particularly for proceedings that are in their early stages of development or where the plaintiffs seek indeterminate damages. Various factors, including, but not limited to, the outcome of potentially lengthy discovery and the resolution of important factual questions, may need to be determined before probability can be established or before a loss or range of loss can be reasonably estimated. If the loss contingency in question is not both probable and reasonably estimable, the Company does not establish an accrual and the matter will continue to be monitored for any developments that would make the loss contingency both probable and reasonably estimable. Based on currently available information known to the Company, it believes that its reserves for litigation-related liabilities are reasonable. However, in the event that a legal proceeding results in a substantial judgment against, or settlement by, the Company, there can be no assurance that any resulting liability or financial commitment would not have a material adverse effect on the financial condition, results of operations or cash flows of the consolidated financial statements of the Company.

The Company is involved in lawsuits in the ordinary course of its business arising out of or otherwise related to its insurance policies. Additionally, from time to time the Company may be involved in lawsuits, including class actions, in the ordinary course of business but not arising out of or otherwise related to its insurance policies. Recently, these proceedings have included claims and lawsuits seeking coverage under commercial property policies for pure economic losses related to COVID-19. These lawsuits are in various stages of development, in various jurisdictions, and the Company intends to vigorously contest these matters. Based on currently available information, the Company does not believe that any such lawsuits will have a material adverse effect on its consolidated financial position, results of operations, or cash flows. However, the Company cannot provide assurance that it will not be negatively impacted by adverse legislation or adverse judicial rulings in some of these matters. Future court decisions and interpretations, as well as future changes, if any, in legislation could create uncertainties and additional liabilities may arise which could have a material adverse effect on the Company’s consolidated financial position, results of operations, or cash flows.

Additionally, the Company may be impacted by adverse regulatory actions and adverse court decisions where insurance coverages are expanded beyond the scope originally contemplated in its insurance policies. The Company believes that the effects, if any, of such regulatory actions and published court decisions are not likely to have a material adverse effect on its consolidated financial position, results of operations or cash flows.

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Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets
Fixed maturities, available-for-sale, at fair value (amortized cost $2,147.5 and $2,117.0, respectively)	$ 2,209.0	$ 2,237.2
Equity securities	399.6	389.7
Other invested assets	76.4	71.1
Other invested assets, at cost	11.8	12.1
Notes receivable from affiliate	70.0	70.0
Total investments	2,766.8	2,780.1
Cash and cash equivalents	59.1	90.7
Accrued investment income and other assets	31.0	29.7
Premiums receivable	12.3	14.0
Deferred policy acquisition costs (affiliated net assumed $32.5 and $30.1, respectively)	121.2	122.2
Reinsurance recoverable on losses and loss expenses payable	23.6	24.3
Prepaid reinsurance premiums	8.5	8.3
Current federal income taxes	1.7	1.7
Net deferred federal income taxes	37.1	27.3
Property and equipment, at cost (net of accumulated depreciation of $3.5 and $3.5, respectively)	4.2	4.2
Total assets	3,065.5	3,102.5
Liabilities and Stockholders’ Equity
Losses and loss expenses payable (affiliated net assumed $454.6 and $438.8, respectively)	1,066.3	1,050.4
Unearned premiums (affiliated net assumed $466.2 and $452.4, respectively)	726.7	723.4
Notes payable (affiliates $15.3 and $15.3, respectively)	122.1	122.1
Pension and postretirement benefits	59.2	66.2
Due to Affiliate	22.1	11.2
Other liabilities (affiliated net assumed $17.3 and $22.4, respectively)	97.1	119.2
Total liabilities	2,093.5	2,092.5
Stockholders’ equity:
Common stock, without par value. Authorized 100.0 shares; 50.9 and 50.7 shares issued, respectively, at stated value of $2.50 per share	127.4	126.8
Treasury stock, 6.9 and 6.9 shares, respectively, at cost	(118.9)	(118.4)
Additional paid-in capital	220.1	213.3
Accumulated other comprehensive (loss) income	(30.1)	13.9
Retained earnings	773.5	774.4
Total stockholders’ equity	972.0	1,010.0
Total liabilities and stockholders’ equity	$ 3,065.5	$ 3,102.5

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Fixed maturities, available-for-sale, amortized cost	$ 2,147.5	$ 2,117.0
Deferred policy acquisitions costs from affiliates	32.5	30.1
Losses and loss expenses payable, affiliates	454.6	438.8
Unearned premiums, affiliates	466.2	452.4
Notes payable, affiliates	15.3	15.3
Net Other Liabilities from Affiliates	$ 17.3	$ 22.4
Common stock, shares authorized (shares)	100.0	100.0
Common stock, shares issued (shares)	50.9	50.7
Common stock, stated value per share (usd per share)	$ 2.50	$ 2.50
Treasury stock (shares)	6.9	6.9
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 3.5		$ 3.5
Class A Preferred Stock [Member]
Preferred stock, shares authorized (shares)	2.5	2.5
Class B Preferred Stock [Member]
Preferred stock, shares authorized (shares)	2.5	2.5

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Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Earned premiums (affiliated net assumed $71.9 and $115.3, respectively, and $251.1 and $349.0, respectively)	$ 355.9	$ 330.5
Net investment income (affiliate $1.3 and $1.3, respectively, and $3.7 and $3.7, respectively)	17.6	18.9
Net realized gains on investments:
Realized Investment Gains (Losses)	38.2	(135.2)
Other income from affiliates	0.5	0.6
Total revenues	412.2	214.8
Losses and loss expenses (affiliated net assumed $34.7 and $128.9, respectively, and $105.4 and $298.8, respectively)	280.8	239.4
Acquisition and operating expenses (affiliated net ceded $26.8 and affiliated net assumed $78.9, respectively, and $52.3 and $231.0, respectively)	121.0	114.9
Interest expense (affiliates $0.2 and $0.2, respectively, and $0.7 and $0.6, respectively)	1.1	1.2
Other Expenses	3.7	3.3
Costs and Expenses	406.6	358.8
Income before federal income taxes	5.6	(144.0)
Deferred Income Tax Expense (Benefit)	2.0	(29.4)
Federal income tax expense	2.0	(29.4)
Net income	$ 3.6	$ (114.6)
Earnings (loss) per common share:
Basic (usd per share)	$ 0.08	$ (2.62)
Diluted (usd per share)	$ 0.08	$ (2.62)

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Condensed Consolidated Statements of Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Earned premiums, from affiliates	$ 78.0	$ 58.3
Net investment income, from affiliate	0.7	0.7
Losses and loss expenses, from affiliates	113.7	10.9
Net Acquisition and Operating Expenses, from affiliates	37.1	20.9
Interest Expense Debt To Affiliates	$ 0.2	$ 0.2

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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3.6	$ (114.6)
Net unrealized holding gains on fixed available-for-sale investments:
Unrealized holding (losses) gains	(57.2)	31.0
Reclassification adjustments for gains realized in net income	(1.5)	(2.4)
Income tax benefit (expense)	12.4	(6.0)
Total net unrealized holding (loss) gains on available-for-sale investments	(46.3)	22.6
Reclassification adjustments for amortization to statements of income:
Negative prior service cost	(1.6)	(1.6)
Net actuarial loss	4.5	3.7
Income tax expense	(0.6)	(0.5)
Total net unrecognized benefit plan obligations	2.3	1.6
Other comprehensive (loss) income	(44.0)	24.2
Comprehensive loss	$ (40.4)	$ (90.4)

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Condensed Consolidated Statement of Stockholders' Equity Statement - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of year (shares) at Dec. 31, 2019		(50.4)	(6.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares (shares)		0.2
Balance at end of year (shares) at Mar. 31, 2020		(50.6)	(6.9)
Balance at beginning of year at Dec. 31, 2019		$ (125.9)	$ (117.5)	$ (206.7)	$ 37.9	$ (782.7)
Balance at end of year at Mar. 31, 2020	$ (866.7)	(126.5)	(118.4)	(209.1)	13.7	(663.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares		0.6		1.3
Shares acquired on stock award exercises and vested restricted shares			$ (0.9)
Stock awards granted				1.1
Change in net unrealized holding (losses) gains, net of tax	22.6				22.6
Change in unrecognized benefit plan obligations, net of tax and reclassification adjustments	1.6				1.6
Net income (loss)	$ (114.6)					(114.6)
Cash dividends paid		$ (4.4)
Cumulative effect of change in accounting to establish an allowance for expected credit losses | Accounting Standards Update 2016-13							$ (0.5)
Document Fiscal Year Focus	2021
Balance at beginning of year (shares) at Dec. 31, 2020		(50.7)	(6.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares (shares)		0.2
Balance at end of year (shares) at Mar. 31, 2021		(50.9)	(6.9)
Balance at beginning of year at Dec. 31, 2020	$ (1,010.0)	$ (126.8)	$ (118.4)	(213.3)	(13.9)	(774.4)
Balance at end of year at Mar. 31, 2021	(972.0)	(127.4)	(118.9)	(220.1)	30.1	(773.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares		0.6		0.6
Shares acquired on stock award exercises and vested restricted shares			$ (0.5)
Stock awards granted				$ 6.2
Change in net unrealized holding (losses) gains, net of tax	(46.3)				(46.3)
Change in unrecognized benefit plan obligations, net of tax and reclassification adjustments	2.3				$ 2.3
Net income (loss)	$ 3.6					$ 3.6
Cash dividends paid		$ (4.5)
Cumulative effect of change in accounting to establish an allowance for expected credit losses | Accounting Standards Update 2016-13							$ 0.0

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Statement of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Dividends paid per common share (usd per share)	$ 0.10	$ 0.10
Retained Earnings [Member]
Cash Dividends Paid to Affiliates	$ 2.6	$ 2.6

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ 3.6	$ (114.6)
Adjustments to reconcile net income (loss) to net cash used in operating activities
Depreciation and amortization, net	1.8	1.6
Share-based compensation	6.7	0.5
Net investment (gain) loss	(38.2)	135.2
Changes in operating assets and liabilities:
Deferred policy acquisition costs	1.0	(2.2)
Accrued investment income and other assets	(1.3)	(1.5)
Premiums receivables	1.7	(1.4)
Postretirement and pension benefits	(6.4)	(0.9)
Other liabilities and due to/from affiliates, net	(9.5)	(24.8)
Reinsurance recoverable on losses and loss expenses payable and prepaid reinsurance premiums	(0.5)	26.5
Losses and loss expenses payable	15.9	19.5
Unearned premiums	3.3	16.5
Excess Tax Benefit from Share-based Compensation, Operating Activities	(0.4)	(0.2)
Federal income taxes	2.4	(29.2)
Net cash used in operating activities	(18.9)	(28.0)
Cash flows from investing activities:
Purchases of fixed maturities available-for-sale	(239.7)	(122.4)
Purchases of equity securities	(9.4)	(16.1)
Purchases of other invested assets	(0.1)	(6.6)
Maturities, calls and pay downs of fixed maturities available-for-sale	102.8	67.9
Sales of fixed maturities available-for-sale	106.0	83.5
Sales of equity securities	31.1	13.2
Sales of other invested assets	0.3	0.4
Proceeds from Sale of Property, Plant, and Equipment	0.0	0.2
Net cash (used in) provided by investing activities	(9.0)	20.1
Cash flows from financing activities:
Proceeds from issuance of common stock	1.2	1.8
Payments to acquire treasury stock	(0.4)	(0.9)
Payment of dividends	(4.5)	(4.4)
Proceeds from short-term debt	0.0	60.0
Net cash (used in) provided by financing activities	(3.7)	56.5
Net (decrease) increase in cash and cash equivalents	(31.6)	48.6
Cash and cash equivalents at beginning of period	90.7	78.0
Cash and cash equivalents at end of period	59.1	126.6
Supplemental disclosures:
Interest Paid, Excluding Capitalized Interest, Operating Activities	$ 1.1	$ 1.2

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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Cash Flows [Abstract]
Interest Expense Debt To Affiliates	$ 0.2	$ 0.2

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Investments

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

The following tables set forth the amortized cost and fair value of investments by investment category at March 31, 2021 and December 31, 2020:

($ millions)	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Fair value
March 31, 2021
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	448.4	$	23.0	$	(0.4)	$	471.0
Obligations of states and political subdivisions	480.4		22.0		(1.9)		500.5
Corporate securities	488.4		17.0		(2.2)		503.2
U.S. government agencies mortgage-backed securities	730.3		15.4		(11.4)		734.3
Total available-for-sale fixed maturities	$	2,147.5	$	77.4	$	(15.9)	$	2,209.0
($ millions)	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Fair value
December 31, 2020
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	506.5	$	45.2	$	—	$	551.7
Obligations of states and political subdivisions	511.3		30.4		(0.2)		541.5
Corporate securities	459.9		23.4		—		483.3
U.S. government agencies mortgage-backed securities	639.3		22.9		(1.5)		660.7
Total available-for-sale fixed maturities	$	2,117.0	$	121.9	$	(1.7)	$	2,237.2

The following tables set forth the Company’s gross unrealized losses and fair value on its investments by lot, aggregated by investment category and length of time for individual securities that have been in a continuous unrealized loss position for which an allowance for credit losses has not been recorded at March 31, 2021 and December 31, 2020:

($ millions, except # of positions)	Less than 12 months					12 months or more					Total
	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions
March 31, 2021
Fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	51.6	$	(0.4)	7	$	—	$	—	—	$	51.6	$	(0.4)	7
Obligations of states and political subdivisions	111.7		(1.9)		18	—		—		—	111.7		(1.9)		18
Corporate securities	110.9		(2.2)		21	—		—		—	110.9		(2.2)		21
U.S. government agencies mortgage-backed securities	354.8		(11.3)		74	10.9		(0.1)		5	365.7		(11.4)		79
Total temporarily impaired securities	$	629.0	$	(15.8)	120	$	10.9	$	(0.1)	5	$	639.9	$	(15.9)	125

($ millions, except # of positions)	Less than 12 months					12 months or more					Total
	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions
December 31, 2020
Fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	9.6	$	—	4	$	—	$	—	—	$	9.6	$	—	4
Obligations of states and political subdivisions	19.5		(0.2)		5	—		—		—	19.5		(0.2)		5
Corporate securities	1.5		—		2	—		—		—	1.5		—		2
U.S. government agencies mortgage-backed securities	136.1		(1.4)		35	7.0		(0.1)		3	143.1		(1.5)		38
Total temporarily impaired securities	$	166.7	$	(1.6)	46	$	7.0	$	(0.1)	3	$	173.7	$	(1.7)	49

The Company reviewed its available-for-sale fixed maturities at March 31, 2021, and determined that no credit impairment existed in the gross unrealized holding losses, due to the reasons discussed below:

•U.S. treasury securities and obligations of U.S. government agencies: These securities were issued by the U.S. Treasury Department or Federal government-sponsored entities. The decline in fair values was attributable to changes in interest rates and not credit quality. The Company does not intend to sell these securities and it is likely that it will not do so before their anticipated recovery. Therefore, the Company does not consider these impaired securities.

•Corporate securities: Corporations in various industries issued these securities. The decline in fair values was attributable to changes in interest rates and not credit quality. The Company reviewed the issuers of these securities to identify any significant adverse change in financial condition, a change in the quality of credit enhancement (if any), a ratings decrease, or negative outlook assignment from a major credit rating agency, and any failure to make interest or principal payments. After these reviews, the Company determined that the decline in fair values was attributable to changes in interest rates and not credit quality. The Company does not intend to sell these securities and it is likely that it will not do so before their anticipated recovery. Therefore, the Company does not consider these impaired securities.

•U.S. government agencies mortgage-backed securities: Federal government-sponsored entities issued these securities. The decline in fair values was attributable to changes in interest rates and not credit quality. The Company does not intend to sell these securities and it is likely that it will not do so before their anticipated recovery. Therefore, the Company does not consider these impaired securities.

The Company regularly monitors its available-for-sale fixed maturities that have fair values less than cost or amortized cost for signs of impairment, an assessment that requires significant management judgment regarding the evidence known. Such

judgments could change in the future as more information becomes known, which could negatively impact the amounts reported. Among the factors that management considers for fixed maturity securities are the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. When a fixed maturity has been determined to have an impairment, the impairment charge representing the credit loss is recognized in earnings as a realized loss and on the balance sheet as an allowance for credit losses netted with the amortized cost of fixed maturities. Future increases in fair value, if related to credit factors, are recognized through earnings limited to the amount previously recognized as an allowance for credit losses. The amount related to non-credit factors is recognized in accumulated other comprehensive income and future increases or decreases in fair value, if not credit losses, are included in accumulated other comprehensive income.

The following table sets forth the amortized cost and fair value of available-for-sale fixed maturities by contractual maturity at March 31, 2021:

($ millions)	Amortized cost		Fair value
Due in 1 year or less	$	158.5	$	159.7
Due after 1 year through 5 years	536.7		562.2
Due after 5 years through 10 years	165.9		170.5
Due after 10 years	556.1		582.3
U.S. government agencies mortgage-backed securities	730.3		734.3
Total	$	2,147.5	$	2,209.0

Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay the obligations with or without call or prepayment penalties.

At March 31, 2021, State Auto P&C had U.S. government agencies mortgage-backed fixed maturity securities, with a carrying value of approximately $106.5 million pledged as collateral for loans from the Federal Home Loan Bank of Cincinnati ("FHLB"). In accordance with the terms of the FHLB Loans, State Auto P&C retains all rights regarding these pledged securities.

At March 31, 2021, State Auto P&C had fixed maturities with fair values of approximately $30.2 million pledged as collateral for the performance obligations under its reinsurance agreement with Home State County Mutual Insurance Company. In accordance with the terms of the trust agreement, State Auto P&C retains all rights regarding these securities, which are included in the “U.S. treasury securities and obligations of U.S. government agencies” classification of the Company’s fixed maturity securities portfolio.

Fixed maturities with fair values of $9.4 million and $9.7 million were on deposit with insurance regulators as required by law at March 31, 2021, and December 31, 2020, respectively. The Company retains all rights regarding these securities.

The following table sets forth the components of net investment income for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Fixed maturities	$	15.4	$	15.1
Equity securities	1.6		3.1
Cash and cash equivalents, and other	0.9		1.0
Investment income	17.9		19.2
Investment expenses	0.3		0.3
Net investment income	$	17.6	$	18.9

The Company’s current investment strategy does not rely on the use of derivative financial instruments.

Proceeds on sales of investments were $137.4 million and $97.1 million for the three months ended March 31, 2021, and 2020, respectively.

The following table sets forth the realized and unrealized holding gains (losses) on the Company’s investment portfolio for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Investment gain (loss), net:
Fixed maturities:
Realized gains on sales of securities	$	3.0	$	3.6
Realized losses on sales of securities	(1.5)		(1.2)
Net gain on fixed securities	1.5		2.4
Net gain (loss) on equity securities	31.5		(122.4)
Net gain (loss) on other invested assets	5.2		(15.4)
Other net realized gain (loss)	—		0.2
Net gain (loss) on investments	$	38.2	$	(135.2)
Change in net unrealized holding (losses) gains, net of tax
Fixed maturities	$	(58.7)	$	28.6
Deferred federal income tax benefit (liability)	12.4		(6.0)
Change in net unrealized holding (losses) gains, net of tax	$	(46.3)	$	22.6

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Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Fair Value of Financial Instruments

Below is the fair value hierarchy that categorizes into three levels the inputs to valuation techniques that are used to measure fair value:

•Level 1 includes observable inputs which reflect quoted prices for identical assets or liabilities in active markets at the measurement date.

•Level 2 includes observable inputs for assets or liabilities other than quoted prices included in Level 1, and it includes valuation techniques which use prices for similar assets and liabilities.

•Level 3 includes unobservable inputs which reflect the reporting entity’s estimates of the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk).

The Company utilizes a nationally recognized third party pricing service to estimate the majority of its investment portfolio’s fair value. The Company obtains one price per security and the processes and control procedures employed by the Company are designed to ensure the value is accurately recorded on an unadjusted basis. Through discussions with the pricing service, the Company gains an understanding of the methodologies used to price the different types of securities, that the data and the valuation methods utilized are appropriate and consistently applied, and that the assumptions are reasonable and representative of fair value. To validate the reasonableness of the valuations obtained from the pricing service, the Company compares to fair value pricing information gathered from other independent pricing sources. At March 31, 2021, and December 31, 2020, the Company did not adjust any of the prices received from the pricing service.

Fixed Maturities

The Company utilizes a nationally recognized third party pricing service to estimate fair value measurements for the majority of its fixed maturities. The fair value estimate of the Company’s fixed maturity investments are determined by evaluations that are based on observable market information rather than market quotes. Inputs to the evaluations include, but are not limited to, market prices from recently completed transactions and transactions of comparable securities, interest rate yield curves, credit spreads, and other market-observable information. The fixed maturity portfolio pricing obtained from the pricing service is reviewed for reasonableness. The Company regularly selects a sample of security prices which are compared to one or more alternative pricing sources for reasonableness. Any significant discrepancies with the pricing are returned to the pricing service for further explanation and, if necessary, adjustments are made. To date, the Company has not identified any significant discrepancies in the pricing provided by its third party pricing service. Investments valued using these inputs include U.S. treasury securities and obligations of U.S. government agencies, obligations of states and political subdivisions, corporate securities (except for a security discussed below), and U.S. government agencies' mortgage-backed securities. All unadjusted estimates of fair value for fixed maturities priced by the pricing service are included in the amounts disclosed in Level 2 of the hierarchy. If market inputs are unavailable, then no fair value is provided by the pricing service. For these securities, fair value is determined either by requesting brokers who are knowledgeable about these securities to provide a quote; or the Company internally determines the fair values by employing widely accepted pricing valuation models, and depending on the level of observable market inputs, renders the fair value estimate as Level 2 or Level 3.

Equities

The fair value of each equity security is based on an observable market price for an identical asset in an active market and is priced by the same pricing service discussed above. All equity securities are recorded using unadjusted market prices and have been disclosed in Level 1.

 Other Invested Assets

Included in other invested assets is one international fund (“the fund”) that invests in equity securities of foreign issuers and is managed by a third party investment manager. The fund had a fair value of $60.6 million and $55.8 million at March 31, 2021, and December 31, 2020, respectively, which was determined using the fund’s net asset value. The Company employs procedures to assess the reasonableness of the fair value of the fund, including obtaining and reviewing the fund’s audited financial statements. There are no unfunded commitments related to the fund. The Company may not sell its investment in the fund; however, the Company may redeem all or a portion of its investment in the fund at net asset value per share with the appropriate prior written notice. In accordance with ASC 820-10, this investment is measured at fair value using the net asset value per share practical expedient and has not been classified in the fair value hierarchy. Fair values presented here are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the condensed consolidated balance sheets.

The remainder of the Company’s other invested assets consist primarily of holdings in publicly-traded mutual funds. The Company believes that its prices for these publicly-traded mutual funds based on an observable market price for an identical asset in an active market reflect their fair values and consequently these securities have been disclosed in Level 1.

 The following tables set forth the Company’s investments within the fair value hierarchy at March 31, 2021 and December 31, 2020:

($ millions)	Total		Level 1		Level 2
March 31, 2021
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	471.0	$	—	$	471.0
Obligations of states and political subdivisions	500.5		—		500.5
Corporate securities	503.2		—		503.2
U.S. government agencies mortgage-backed securities	734.3		—		734.3
Total available-for-sale fixed maturities	2,209.0		—		2,209.0
Equity securities:
Large-cap securities	149.2		149.2		—
Mutual and exchange traded funds	250.4		250.4		—
Total equity securities	399.6		399.6		—
Other invested assets	15.8		15.8		—
Total investments	$	2,624.4	$	415.4	$	2,209.0
($ millions)	Total		Level 1		Level 2
December 31, 2020
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	551.7	$	—	$	551.7
Obligations of states and political subdivisions	541.5		—		541.5
Corporate securities	483.3		—		483.3
U.S. government agencies mortgage-backed securities	660.7		—		660.7
Total available-for-sale fixed maturities	2,237.2		—		2,237.2
Equity securities:
Large-cap securities	134.2		134.2		—
Mutual and exchange traded funds	255.5		255.5		—
Total equity securities	389.7		389.7		—
Other invested assets	15.3		15.3		—
Total investments	$	2,642.2	$	405.0	$	2,237.2

The following sections describe the valuation methods used by the Company for each type of financial instrument it holds that is not measured at fair value but for which fair value is disclosed:

Financial Instruments Disclosed, But Not Carried, At Fair Value

Other Invested Assets, at Cost

Included in other invested assets, at cost are common stock of the FHLB and the Trust Securities. The Trust Securities and FHLB common stock are carried at cost, which approximates fair value. The fair value of the FHLB common stock at March 31, 2021, was $11.3 million and the fair value of the Trust Securities was $0.5 million. The investments have been placed in Level 3 of the fair value hierarchy.

Notes Receivable from Affiliate

The Company has two separate credit agreements with State Automobile Mutual Insurance Company (“State Auto Mutual") pursuant to which it loaned State Auto Mutual a total of $70.0 million at an interest rate of 4.05%, with principal payable in May 2029. The Company estimates the fair value of the notes receivable from affiliate using market quotations for U.S. treasury securities with similar maturity dates and applies an appropriate credit spread. Consequently this has been placed in Level 2 of the fair value hierarchy.

($ millions, except interest rates)	March 31, 2021						December 31, 2020
	Carrying value		Fair value		Interest rate		Carrying value		Fair value		Interest rate
Notes receivable from affiliate, issued May 2019	$	70.0	$	76.6	4.05	%	$	70.0	$	80.4	4.05	%

Notes Payable

Included in notes payable are the FHLB Loans and Subordinated Debentures. The Company estimates the fair value of the FHLB Loans by discounting cash flows using a borrowing rate currently available to the Company for loans with similar terms. The FHLB Loans have been placed in Level 3 of the fair value hierarchy. The carrying amount of the Subordinated Debentures approximates its fair value as the interest rate adjusts quarterly and has been disclosed in Level 3.

($ millions, except interest rates)	March 31, 2021						December 31, 2020
	Carrying value		Fair Value		Interest rate		Carrying value		Fair value		Interest rate
FHLB Loan due 2030: issued $21.5, September 2020 with fixed interest	21.5		20.2		1.37	%	21.5		21.6		1.37	%
FHLB Loan due 2033: issued $85.0, May 2018 with fixed interest	85.3		101.2		3.96	%	85.3		107.1		3.96	%
Affiliate Subordinated Debentures due 2033: issued $15.5, May 2003 with variable interest	15.3		15.3		4.39	%	15.3		15.3		4.43	%
Total notes payable	$	122.1	$	136.7			$	122.1	$	144.0

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Deferred Acquisition Costs Deferred Acquisition Costs

3 Months Ended

Mar. 31, 2021

Deferred Policy Acquisition Costs Disclosures [Abstract]

Deferred Policy Acquisition Costs [Text Block]

Deferred Acquisition Costs

The following table sets forth net deferred acquisition costs for the three months ended March 31, 2021 and 2020:

($ millions)	2021		2020
Beginning balance at January 1	$	122.2	$	111.1
Acquisition costs deferred	60.6		91.1
Acquisition costs amortized to expense	(61.6)		(88.9)
Ending balance at March 31	$	121.2	$	113.3

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Losses and Loss Expenses Payable Losses and Loss Expenses Payable

3 Months Ended

Mar. 31, 2021

Losses and Loss Expenses Payable [Abstract]

Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]

. Losses and Loss Expenses Payable

The following table sets forth the activity in the liability for losses and loss expenses for the three months ended March 31, 2021 and 2020:

($ millions)	2021		2020
Losses and loss expenses payable, at beginning of period	$	1,050.4	$	1,066.5
Less: reinsurance recoverable on losses and loss expenses payable	24.3		13.6
Net balance at beginning of period	1,026.1		1,052.9
Incurred related to:
Current year	311.3		246.9
Prior years	(30.5)		(7.5)
Total incurred	280.8		239.4
Paid related to:
Current year	105.7		74.1
Prior years	158.5		171.3
Total paid	264.2		245.4
Net balance at end of period	1,042.7		1,046.9
Plus: reinsurance recoverable on losses and loss expenses payable	23.6		39.7
Losses and loss expenses payable, at end of period	$	1,066.3	$	1,086.6

The Company recorded more favorable development related to prior years’ loss and loss expense reserves for the three months ended March 31, 2021, of $30.5 million compared to $7.5 million for the same 2020 period. Favorable development of prior accident years' non-catastrophe loss and ALAE reserves for the three months ended March 31, 2021 was $24.6 million, due to favorable development of $21.8 million and $2.9 million in the commercial and personal insurance segments, respectively. In the commercial insurance segment, all products developed favorably, with workers' compensation and middle market commercial contributing $8.5 million and $8.1 million, respectively. In the personal insurance segment, the favorable development was primarily driven by homeowners, which contributed $2.1 million of favorable development. For the three months ended March 31, 2021, the prior accident years' catastrophe loss and ALAE reserves contributed $3.8 million of favorable development.

For the three months ended March 31, 2020, favorable development of prior accident year's non-catastrophe loss and ALAE reserves was $10.5 million, due to favorable development in the commercial insurance segment. In the commercial insurance segment, all lines contributed favorable development, with small commercial package, middle market commercial, and workers' compensation contributing $5.4 million, $5.1 million, and $4.0 million respectively. Somewhat offsetting the favorable development was adverse development in the personal insurance segment of $6.4 million, driven by personal auto and homeowners which contributed $5.2 million and $2.2 million of adverse development, respectively

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Reinsurance

3 Months Ended

Mar. 31, 2021

Insurance [Abstract]

Reinsurance

ReinsuranceThe insurance subsidiaries of State Auto Financial, referred to as the STFC Pooled Companies, participate in a quota share reinsurance pooling arrangement (“the Pooling Arrangement”) with the Mutual Pooled Companies.

The following table sets forth a summary of the Company’s external reinsurance transactions, as well as reinsurance transactions with State Auto Mutual under the Pooling Arrangement, for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Premiums earned:
Assumed from external insurers and reinsurers	$	21.8	$	20.6
Assumed under Pooling Arrangement	355.9		330.5
Ceded to external insurers and reinsurers	(9.0)		(10.6)
Ceded under Pooling Arrangement	(277.9)		(272.2)
Net assumed premiums earned	$	90.8	$	68.3
Losses and loss expenses incurred:
Assumed from external insurers and reinsurers	$	14.5	$	11.7
Assumed under Pooling Arrangement	280.8		239.4
Ceded to external insurers and reinsurers	(3.3)		(33.5)
Ceded under Pooling Arrangement	(167.1)		(228.5)
Net assumed losses and loss expenses incurred	$	124.9	$	(10.9)

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Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The following table sets forth the reconciliation between actual federal income tax expense and the amount computed at the indicated statutory rate for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021				2020
Amount at statutory rate	$	1.2	21.0	%	$	(30.2)	21.0	%
Tax-exempt interest and dividends received deduction	(0.6)		(11.3)		(0.7)		0.5
Other, net	1.4		26.6		1.5		(1.1)
Federal income tax expense (benefit)	2.0		36.3	%	(29.4)		20.4	%

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Pension and Postretirement Benefit Plans

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Pension and Postretirement Benefit Plans

Pension and Postretirement Benefit Plans

The following table sets forth information regarding the Company’s share of pension and postretirement benefit plans’

components of net periodic cost for the three months ended March 31, 2021 and 2020:

($ millions)	Pension				Postretirement
	Three months ended March 31
	2021		2020		2021		2020
Service cost	$	1.3	$	1.2	$	—	$	—
Interest cost	2.1		2.4		—		0.1
Expected return on plan assets	(4.3)		(4.4)		—		—
Amortization of:
Negative prior service cost	—		—		(1.4)		(1.4)
Net actuarial loss	3.5		2.3		—		0.1
Net periodic cost (benefit)	$	2.6	$	1.5	$	(1.4)	$	(1.2)

The Company contributed $5.0 million to its pension plan for the three months ended March 31, 2021 and expects to contribute an additional $10.0 million to its pension plan during 2021.

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Other Comprehensive Income and Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Other Comprehensive Income and Accumulated Other Comprehensive Income

Other Comprehensive (Loss) Income and Accumulated Other Comprehensive (Loss) Income

The following tables set forth the changes in the Company’s accumulated other comprehensive (loss) income ("AOC(L)I"), net of tax, for the three months ended March 31, 2021 and 2020:

($ millions)		Unrealized Gains and Losses on Available-for-Sale  Securities		Benefit Plan Items		Total
Beginning balance at January 1, 2021		$	97.5	$	(83.6)	$	13.9
Other comprehensive loss before reclassifications		(45.1)		—		(45.1)
Amounts reclassified from AOCI (a)		(1.2)		2.3		1.1
Net current period other comprehensive (loss) income		(46.3)		2.3		(44.0)
Ending balance at March 31, 2021		$	51.2	$	(81.3)	$	(30.1)
Beginning balance at January 1, 2020		$	40.4	$	(78.3)	$	(37.9)
Other comprehensive income before reclassifications		24.5		—		24.5
Amounts reclassified from AOCI (a)		(1.9)		1.6		(0.3)
Net current period other comprehensive income		22.6		1.6		24.2
Ending balance at March 31, 2020		$	63.0	$	(76.7)	$	(13.7)
(a)	See separate table below for details about these reclassifications

    The following tables set forth the reclassifications out of accumulated other comprehensive (loss) income, by component, to the Company’s condensed consolidated statement of income for the three months ended March 31, 2021 and 2020:

($ millions)
Details about Accumulated Other		Three months ended March 31				Affected line item in the Condensed
Comprehensive Income Components						Consolidated Statements of Income
		2021		2020
Unrealized gains on available-for-sale fixed maturity investments		$	1.5	$	2.4	Realized gain on sale of securities
		1.5		2.4		Total before tax
		(0.3)		(0.5)		Tax expense
		1.2		1.9		Net of tax
Amortization of benefit plan items
Negative prior service cost		1.6		1.6		(b)
Net actuarial loss		(4.5)		(3.7)		(b)
		(2.9)		(2.1)		Total before tax
		0.6		0.5		Tax benefit
		(2.3)		(1.6)		Net of tax
Total reclassifications for the period		$	(1.1)	$	0.3
(b)	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see pension and postretirement benefit plans footnote for additional details).

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Earnings per Common Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Earnings (Loss) per Common Share

Net Earnings (Loss) per Common Share

The following table sets forth the compilation of basic and diluted earnings (loss) per common share for the three months ended March 31, 2021 and 2020:

($ and shares in millions, except per share amounts)	Three months ended March 31
	2021		2020
Numerator:
Net income (loss) for basic earnings (loss) per common share	$	3.6	$	(114.6)
Denominator:
Weighted average shares for basic earnings (loss) per common share	43.9		43.7
Effect of dilutive share-based awards	0.7		—
Adjusted weighted average shares for diluted earnings (loss) per common share	44.6		43.7
Basic net earnings (loss) per common share	$	0.08	$	(2.62)
Diluted net earnings (loss) per common share	$	0.08	$	(2.62)

The following table sets forth stock awards and restricted share units ("RSU award") of the Company that were not included in the computation of diluted earnings (loss) per common share because the exercise price of the awards was greater than the average market price or their inclusion would have been antidilutive for the three months ended March 31, 2021 and 2020:

(shares in millions)	Three months ended March 31
	2021	2020
Total number of antidilutive awards	—	0.5

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Segment Information

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company's reportable segments are: personal insurance, commercial insurance, and investment operations. The reportable insurance segments are business units managed separately because of the differences in the type of customers they serve, the products they provide or services they offer. The insurance segments market a broad line of property and casualty insurance products throughout the United States through independent insurance agencies, which include retail agents and wholesale brokers. The investment operations segment, managed by Stateco, provides investment services.

The Company evaluates the performance of its insurance segments using industry financial measurements based on Statutory Accounting Practices (“SAP”), which include loss and loss adjustment expense ratios, underwriting expense ratios, combined ratios, statutory underwriting gain (loss), net premiums earned and net written premiums. One of the most significant differences between SAP and GAAP is that SAP requires all underwriting expenses to be expensed immediately and not deferred and amortized over the same period the premium is earned.

The investment operations segment is evaluated based on investment returns of assets managed by Stateco. Asset information by segment is not reported for the insurance segments because the Company does not produce such information internally.

The following table sets forth financial information regarding the Company’s reportable segments and specialty run-off (for the previously exited specialty insurance business) for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Revenue from external sources:
Insurance operations
Personal insurance	$	207.8	$	198.1
Commercial insurance	148.7		132.4
Specialty run-off	(0.6)		—
Total insurance operations	355.9		330.5
Investment operations
Net investment income	17.6		18.9
Net investment gain (loss)	38.2		(135.2)
Total investment operations	55.8		(116.3)
All other	0.5		0.6
Total revenue from external sources	412.2		214.8
Intersegment revenue	1.6		1.6
Total revenue	413.8		216.4
Reconciling items:
Eliminate intersegment revenue	(1.6)		(1.6)
Total consolidated revenues	$	412.2	$	214.8
Segment income (loss) before federal income tax:
Insurance operations SAP underwriting (loss) gain
Personal insurance	$	(49.4)	$	0.3
Commercial insurance	3.0		(30.0)
Specialty run-off	1.6		(0.4)
Total insurance operations	(44.8)		(30.1)
Investment operations
Net investment income	17.6		18.9
Net investment gain (loss)	38.2		(135.2)
Total investment operations	55.8		(116.3)
All other	—		0.1
Total segment income (loss) before reconciling items	11.0		(146.3)
Reconciling items:
GAAP expense adjustments	(1.3)		5.9
Interest expense on corporate debt	(1.1)		(1.2)
Corporate expenses	(3.0)		(2.4)
Total reconciling items	(5.4)		2.3
Total consolidated income (loss) before federal income tax	$	5.6	$	(144.0)

Investable assets attributable to the Company’s investment operations segment totaled $2,825.9 million and $2,870.8 million at March 31, 2021, and December 31, 2020, respectively.

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Basis of Presentation Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

New Accounting Pronouncements

Adoption of Recent Accounting Pronouncements

Income Taxes - Simplifying the Accounting for Income Taxes

In December 2019, the FASB issued ASU 2019-12 which updated guidance for the accounting for income taxes. The updated guidance is intended to simplify the accounting for income taxes by removing several exceptions contained in existing guidance and amending other existing guidance to simplify several other income tax accounting matters. The guidance became effective for annual and interim reporting periods after December 15, 2020 and did not have a material impact on the Company's results of operations, consolidated financial position or cash flows.

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Investments (Tables)

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Cost or Amortized Cost and Fair Value of Available-for-Sale Securities

The following tables set forth the amortized cost and fair value of investments by investment category at March 31, 2021 and December 31, 2020:

($ millions)	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Fair value
March 31, 2021
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	448.4	$	23.0	$	(0.4)	$	471.0
Obligations of states and political subdivisions	480.4		22.0		(1.9)		500.5
Corporate securities	488.4		17.0		(2.2)		503.2
U.S. government agencies mortgage-backed securities	730.3		15.4		(11.4)		734.3
Total available-for-sale fixed maturities	$	2,147.5	$	77.4	$	(15.9)	$	2,209.0
($ millions)	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Fair value
December 31, 2020
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	506.5	$	45.2	$	—	$	551.7
Obligations of states and political subdivisions	511.3		30.4		(0.2)		541.5
Corporate securities	459.9		23.4		—		483.3
U.S. government agencies mortgage-backed securities	639.3		22.9		(1.5)		660.7
Total available-for-sale fixed maturities	$	2,117.0	$	121.9	$	(1.7)	$	2,237.2

Gross Unrealized Losses and Fair Value on its Investments

The following tables set forth the Company’s gross unrealized losses and fair value on its investments by lot, aggregated by investment category and length of time for individual securities that have been in a continuous unrealized loss position for which an allowance for credit losses has not been recorded at March 31, 2021 and December 31, 2020:

($ millions, except # of positions)	Less than 12 months					12 months or more					Total
	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions
March 31, 2021
Fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	51.6	$	(0.4)	7	$	—	$	—	—	$	51.6	$	(0.4)	7
Obligations of states and political subdivisions	111.7		(1.9)		18	—		—		—	111.7		(1.9)		18
Corporate securities	110.9		(2.2)		21	—		—		—	110.9		(2.2)		21
U.S. government agencies mortgage-backed securities	354.8		(11.3)		74	10.9		(0.1)		5	365.7		(11.4)		79
Total temporarily impaired securities	$	629.0	$	(15.8)	120	$	10.9	$	(0.1)	5	$	639.9	$	(15.9)	125

($ millions, except # of positions)	Less than 12 months					12 months or more					Total
	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions	Fair value		Unrealized losses		Number of positions
December 31, 2020
Fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	9.6	$	—	4	$	—	$	—	—	$	9.6	$	—	4
Obligations of states and political subdivisions	19.5		(0.2)		5	—		—		—	19.5		(0.2)		5
Corporate securities	1.5		—		2	—		—		—	1.5		—		2
U.S. government agencies mortgage-backed securities	136.1		(1.4)		35	7.0		(0.1)		3	143.1		(1.5)		38
Total temporarily impaired securities	$	166.7	$	(1.6)	46	$	7.0	$	(0.1)	3	$	173.7	$	(1.7)	49

Amortized Cost and Fair Value of Available-for-Sale Fixed Maturities by Contractual Maturity

The following table sets forth the amortized cost and fair value of available-for-sale fixed maturities by contractual maturity at March 31, 2021:

($ millions)	Amortized cost		Fair value
Due in 1 year or less	$	158.5	$	159.7
Due after 1 year through 5 years	536.7		562.2
Due after 5 years through 10 years	165.9		170.5
Due after 10 years	556.1		582.3
U.S. government agencies mortgage-backed securities	730.3		734.3
Total	$	2,147.5	$	2,209.0

Components of Net Investment Income

The following table sets forth the components of net investment income for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Fixed maturities	$	15.4	$	15.1
Equity securities	1.6		3.1
Cash and cash equivalents, and other	0.9		1.0
Investment income	17.9		19.2
Investment expenses	0.3		0.3
Net investment income	$	17.6	$	18.9

Realized and Unrealized Holding Gains (Losses)

The following table sets forth the realized and unrealized holding gains (losses) on the Company’s investment portfolio for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Investment gain (loss), net:
Fixed maturities:
Realized gains on sales of securities	$	3.0	$	3.6
Realized losses on sales of securities	(1.5)		(1.2)
Net gain on fixed securities	1.5		2.4
Net gain (loss) on equity securities	31.5		(122.4)
Net gain (loss) on other invested assets	5.2		(15.4)
Other net realized gain (loss)	—		0.2
Net gain (loss) on investments	$	38.2	$	(135.2)
Change in net unrealized holding (losses) gains, net of tax
Fixed maturities	$	(58.7)	$	28.6
Deferred federal income tax benefit (liability)	12.4		(6.0)
Change in net unrealized holding (losses) gains, net of tax	$	(46.3)	$	22.6

The unrealized holding gains recognized for the three months ended March 31, 2021 on equity securities still held was $27.8 million while unrealized holding losses recognized for the three months ended March 31, 2020 on equity securities still held was $123.3 million. The unrealized holding gains recognized for the three months ended March 31, 2021 on other invested assets still held was $5.2 million while the unrealized holding losses recognized for the three months ended March 31, 2020 on other invested assets still held was $15.4 million.

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Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Company's Investments within Fair Value Hierarchy

The following tables set forth the Company’s investments within the fair value hierarchy at March 31, 2021 and December 31, 2020:

($ millions)	Total		Level 1		Level 2
March 31, 2021
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	471.0	$	—	$	471.0
Obligations of states and political subdivisions	500.5		—		500.5
Corporate securities	503.2		—		503.2
U.S. government agencies mortgage-backed securities	734.3		—		734.3
Total available-for-sale fixed maturities	2,209.0		—		2,209.0
Equity securities:
Large-cap securities	149.2		149.2		—
Mutual and exchange traded funds	250.4		250.4		—
Total equity securities	399.6		399.6		—
Other invested assets	15.8		15.8		—
Total investments	$	2,624.4	$	415.4	$	2,209.0
($ millions)	Total		Level 1		Level 2
December 31, 2020
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies	$	551.7	$	—	$	551.7
Obligations of states and political subdivisions	541.5		—		541.5
Corporate securities	483.3		—		483.3
U.S. government agencies mortgage-backed securities	660.7		—		660.7
Total available-for-sale fixed maturities	2,237.2		—		2,237.2
Equity securities:
Large-cap securities	134.2		134.2		—
Mutual and exchange traded funds	255.5		255.5		—
Total equity securities	389.7		389.7		—
Other invested assets	15.3		15.3		—
Total investments	$	2,642.2	$	405.0	$	2,237.2

Company Estimates Receivable from Affiliate using Market Quotations for U.S. Treasury Securities

Consequently this has been placed in Level 2 of the fair value hierarchy.

($ millions, except interest rates)	March 31, 2021						December 31, 2020
	Carrying value		Fair value		Interest rate		Carrying value		Fair value		Interest rate
Notes receivable from affiliate, issued May 2019	$	70.0	$	76.6	4.05	%	$	70.0	$	80.4	4.05	%

Included in Notes Payable are Senior Notes and Subordinated Debentures

The carrying amount of the Subordinated Debentures approximates its fair value as the interest rate adjusts quarterly and has been disclosed in Level 3.

($ millions, except interest rates)	March 31, 2021						December 31, 2020
	Carrying value		Fair Value		Interest rate		Carrying value		Fair value		Interest rate
FHLB Loan due 2030: issued $21.5, September 2020 with fixed interest	21.5		20.2		1.37	%	21.5		21.6		1.37	%
FHLB Loan due 2033: issued $85.0, May 2018 with fixed interest	85.3		101.2		3.96	%	85.3		107.1		3.96	%
Affiliate Subordinated Debentures due 2033: issued $15.5, May 2003 with variable interest	15.3		15.3		4.39	%	15.3		15.3		4.43	%
Total notes payable	$	122.1	$	136.7			$	122.1	$	144.0

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Deferred Acquisition Costs Deferred Acquisition Costs (Tables)

3 Months Ended

Mar. 31, 2021

Deferred Policy Acquisition Costs Disclosures [Abstract]

Deferred Policy Acquisition Costs [Table Text Block]

The following table sets forth net deferred acquisition costs for the three months ended March 31, 2021 and 2020:

($ millions)	2021		2020
Beginning balance at January 1	$	122.2	$	111.1
Acquisition costs deferred	60.6		91.1
Acquisition costs amortized to expense	(61.6)		(88.9)
Ending balance at March 31	$	121.2	$	113.3

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Losses and Loss Expenses Payable Losses and Loss Expenses Payable (Tables)

3 Months Ended

Mar. 31, 2021

Losses and Loss Expenses Payable [Abstract]

Schedule Of Activity In Liability For Unpaid Losses And Loss Adjustment Expenses Table [Table Text Block]

The following table sets forth the activity in the liability for losses and loss expenses for the three months ended March 31, 2021 and 2020:

($ millions)	2021		2020
Losses and loss expenses payable, at beginning of period	$	1,050.4	$	1,066.5
Less: reinsurance recoverable on losses and loss expenses payable	24.3		13.6
Net balance at beginning of period	1,026.1		1,052.9
Incurred related to:
Current year	311.3		246.9
Prior years	(30.5)		(7.5)
Total incurred	280.8		239.4
Paid related to:
Current year	105.7		74.1
Prior years	158.5		171.3
Total paid	264.2		245.4
Net balance at end of period	1,042.7		1,046.9
Plus: reinsurance recoverable on losses and loss expenses payable	23.6		39.7
Losses and loss expenses payable, at end of period	$	1,066.3	$	1,086.6

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Reinsurance (Tables)

3 Months Ended

Mar. 31, 2021

Insurance [Abstract]

Summary of External Reinsurance Transactions with State Auto Mutual Under Pooling Arrangement

The following table sets forth a summary of the Company’s external reinsurance transactions, as well as reinsurance transactions with State Auto Mutual under the Pooling Arrangement, for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Premiums earned:
Assumed from external insurers and reinsurers	$	21.8	$	20.6
Assumed under Pooling Arrangement	355.9		330.5
Ceded to external insurers and reinsurers	(9.0)		(10.6)
Ceded under Pooling Arrangement	(277.9)		(272.2)
Net assumed premiums earned	$	90.8	$	68.3
Losses and loss expenses incurred:
Assumed from external insurers and reinsurers	$	14.5	$	11.7
Assumed under Pooling Arrangement	280.8		239.4
Ceded to external insurers and reinsurers	(3.3)		(33.5)
Ceded under Pooling Arrangement	(167.1)		(228.5)
Net assumed losses and loss expenses incurred	$	124.9	$	(10.9)

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Reconciliation Between Actual Federal Income Tax Benefit and Amount Computed at Indicated Statutory Rate

The following table sets forth the reconciliation between actual federal income tax expense and the amount computed at the indicated statutory rate for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021				2020
Amount at statutory rate	$	1.2	21.0	%	$	(30.2)	21.0	%
Tax-exempt interest and dividends received deduction	(0.6)		(11.3)		(0.7)		0.5
Other, net	1.4		26.6		1.5		(1.1)
Federal income tax expense (benefit)	2.0		36.3	%	(29.4)		20.4	%

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Pension and Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Company's Share of Net Periodic Cost Components

for the three months ended March 31, 2021 and 2020:

($ millions)	Pension				Postretirement
	Three months ended March 31
	2021		2020		2021		2020
Service cost	$	1.3	$	1.2	$	—	$	—
Interest cost	2.1		2.4		—		0.1
Expected return on plan assets	(4.3)		(4.4)		—		—
Amortization of:
Negative prior service cost	—		—		(1.4)		(1.4)
Net actuarial loss	3.5		2.3		—		0.1
Net periodic cost (benefit)	$	2.6	$	1.5	$	(1.4)	$	(1.2)

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Other Comprehensive Income and Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Changes in Accumulated Other Comprehensive Income by Component, Net of Tax

The following tables set forth the changes in the Company’s accumulated other comprehensive (loss) income ("AOC(L)I"), net of tax, for the three months ended March 31, 2021 and 2020:

($ millions)		Unrealized Gains and Losses on Available-for-Sale  Securities		Benefit Plan Items		Total
Beginning balance at January 1, 2021		$	97.5	$	(83.6)	$	13.9
Other comprehensive loss before reclassifications		(45.1)		—		(45.1)
Amounts reclassified from AOCI (a)		(1.2)		2.3		1.1
Net current period other comprehensive (loss) income		(46.3)		2.3		(44.0)
Ending balance at March 31, 2021		$	51.2	$	(81.3)	$	(30.1)
Beginning balance at January 1, 2020		$	40.4	$	(78.3)	$	(37.9)
Other comprehensive income before reclassifications		24.5		—		24.5
Amounts reclassified from AOCI (a)		(1.9)		1.6		(0.3)
Net current period other comprehensive income		22.6		1.6		24.2
Ending balance at March 31, 2020		$	63.0	$	(76.7)	$	(13.7)
(a)	See separate table below for details about these reclassifications

Schedule of Reclassifications Out of Accumulated Other Comprehensive Income by Component

The following tables set forth the reclassifications out of accumulated other comprehensive (loss) income, by component, to the Company’s condensed consolidated statement of income for the three months ended March 31, 2021 and 2020:

($ millions)
Details about Accumulated Other		Three months ended March 31				Affected line item in the Condensed
Comprehensive Income Components						Consolidated Statements of Income
		2021		2020
Unrealized gains on available-for-sale fixed maturity investments		$	1.5	$	2.4	Realized gain on sale of securities
		1.5		2.4		Total before tax
		(0.3)		(0.5)		Tax expense
		1.2		1.9		Net of tax
Amortization of benefit plan items
Negative prior service cost		1.6		1.6		(b)
Net actuarial loss		(4.5)		(3.7)		(b)
		(2.9)		(2.1)		Total before tax
		0.6		0.5		Tax benefit
		(2.3)		(1.6)		Net of tax
Total reclassifications for the period		$	(1.1)	$	0.3
(b)	These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see pension and postretirement benefit plans footnote for additional details).

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Earnings per Common Share (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Compilation of Basic and Diluted Earnings Per Common Share

The following table sets forth the compilation of basic and diluted earnings (loss) per common share for the three months ended March 31, 2021 and 2020:

($ and shares in millions, except per share amounts)	Three months ended March 31
	2021		2020
Numerator:
Net income (loss) for basic earnings (loss) per common share	$	3.6	$	(114.6)
Denominator:
Weighted average shares for basic earnings (loss) per common share	43.9		43.7
Effect of dilutive share-based awards	0.7		—
Adjusted weighted average shares for diluted earnings (loss) per common share	44.6		43.7
Basic net earnings (loss) per common share	$	0.08	$	(2.62)
Diluted net earnings (loss) per common share	$	0.08	$	(2.62)

Options to Purchase Shares of Common Stock

The following table sets forth stock awards and restricted share units ("RSU award") of the Company that were not included in the computation of diluted earnings (loss) per common share because the exercise price of the awards was greater than the average market price or their inclusion would have been antidilutive for the three months ended March 31, 2021 and 2020:

(shares in millions)	Three months ended March 31
	2021	2020
Total number of antidilutive awards	—	0.5

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Financial Information Regarding Company's Reportable Segments

The following table sets forth financial information regarding the Company’s reportable segments and specialty run-off (for the previously exited specialty insurance business) for the three months ended March 31, 2021 and 2020:

($ millions)	Three months ended March 31
	2021		2020
Revenue from external sources:
Insurance operations
Personal insurance	$	207.8	$	198.1
Commercial insurance	148.7		132.4
Specialty run-off	(0.6)		—
Total insurance operations	355.9		330.5
Investment operations
Net investment income	17.6		18.9
Net investment gain (loss)	38.2		(135.2)
Total investment operations	55.8		(116.3)
All other	0.5		0.6
Total revenue from external sources	412.2		214.8
Intersegment revenue	1.6		1.6
Total revenue	413.8		216.4
Reconciling items:
Eliminate intersegment revenue	(1.6)		(1.6)
Total consolidated revenues	$	412.2	$	214.8
Segment income (loss) before federal income tax:
Insurance operations SAP underwriting (loss) gain
Personal insurance	$	(49.4)	$	0.3
Commercial insurance	3.0		(30.0)
Specialty run-off	1.6		(0.4)
Total insurance operations	(44.8)		(30.1)
Investment operations
Net investment income	17.6		18.9
Net investment gain (loss)	38.2		(135.2)
Total investment operations	55.8		(116.3)
All other	—		0.1
Total segment income (loss) before reconciling items	11.0		(146.3)
Reconciling items:
GAAP expense adjustments	(1.3)		5.9
Interest expense on corporate debt	(1.1)		(1.2)
Corporate expenses	(3.0)		(2.4)
Total reconciling items	(5.4)		2.3
Total consolidated income (loss) before federal income tax	$	5.6	$	(144.0)

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Accounting Changes and Error Corrections (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Premiums receivable	$ 12.3		$ 14.0
Assets	3,065.5		$ 3,102.5
Premiums receivables	1.7	$ (1.4)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(9.5)	(24.8)
Net cash used in operating activities	$ (18.9)	$ (28.0)

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Investments - Cost or Amortized Cost and Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 2,147.5	$ 2,117.0
Gross unrealized holding gains	77.4	121.9
Gross unrealized holding losses	(15.9)	(1.7)
Fair value	2,209.0	2,237.2
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	448.4	506.5
Gross unrealized holding gains	23.0	45.2
Gross unrealized holding losses	(0.4)	0.0
Fair value	471.0	551.7
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	480.4	511.3
Gross unrealized holding gains	22.0	30.4
Gross unrealized holding losses	(1.9)	(0.2)
Fair value	500.5	541.5
Corporate Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	488.4	459.9
Gross unrealized holding gains	17.0	23.4
Gross unrealized holding losses	(2.2)	0.0
Fair value	503.2	483.3
U.S. Government Agencies Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	730.3	639.3
Gross unrealized holding gains	15.4	22.9
Gross unrealized holding losses	(11.4)	(1.5)
Fair value	$ 734.3	$ 660.7

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Investments - Available for Sale Securities Continuous Unrealized Loss Position Fair Value and Aggregate Losses (Detail) $ in Millions	Mar. 31, 2021 USD ($) position	Dec. 31, 2020 USD ($) position
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, Fair value	$ 629.0	$ 166.7
Less than 12 months, Unrealized losses	$ (15.8)	$ (1.6)
Less than 12 months, Number of positions | position	120	46
12 months or more, Fair value	$ 10.9	$ 7.0
12 months or more, Unrealized losses	$ (0.1)	$ (0.1)
12 months or more, Number of positions | position	5	3
Total, Fair value	$ 639.9	$ 173.7
Total, Unrealized losses	$ (15.9)	$ (1.7)
Total, Number of positions | position	125	49
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, Fair value	$ 51.6	$ 9.6
Less than 12 months, Unrealized losses	$ (0.4)	$ 0.0
Less than 12 months, Number of positions | position	7	4
12 months or more, Fair value	$ 0.0	$ 0.0
12 months or more, Unrealized losses	$ 0.0	$ 0.0
12 months or more, Number of positions | position	0	0
Total, Fair value	$ 51.6	$ 9.6
Total, Unrealized losses	$ (0.4)	$ 0.0
Total, Number of positions | position	7	4
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, Fair value	$ 111.7	$ 19.5
Less than 12 months, Unrealized losses	$ (1.9)	$ (0.2)
Less than 12 months, Number of positions | position	18	5
12 months or more, Fair value	$ 0.0	$ 0.0
12 months or more, Unrealized losses	$ 0.0	$ 0.0
12 months or more, Number of positions | position	0	0
Total, Fair value	$ 111.7	$ 19.5
Total, Unrealized losses	$ (1.9)	$ (0.2)
Total, Number of positions | position	18	5
Corporate Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, Fair value	$ 110.9	$ 1.5
Less than 12 months, Unrealized losses	$ (2.2)	$ 0.0
Less than 12 months, Number of positions | position	21	2
12 months or more, Fair value	$ 0.0	$ 0.0
12 months or more, Unrealized losses	$ 0.0	$ 0.0
12 months or more, Number of positions | position	0	0
Total, Fair value	$ 110.9	$ 1.5
Total, Unrealized losses	$ (2.2)	$ 0.0
Total, Number of positions | position	21	2
U.S. Government Agencies Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, Fair value	$ 354.8	$ 136.1
Less than 12 months, Unrealized losses	$ (11.3)	$ (1.4)
Less than 12 months, Number of positions | position	74	35
12 months or more, Fair value	$ 10.9	$ 7.0
12 months or more, Unrealized losses	$ (0.1)	$ (0.1)
12 months or more, Number of positions | position	5	3
Total, Fair value	$ 365.7	$ 143.1
Total, Unrealized losses	$ (11.4)	$ (1.5)
Total, Number of positions | position	79	38

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Investments - Amortized Cost and Fair Value of Available-for-Sale Fixed Maturities by Contractual Maturity (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Amortized cost
Due in 1 year or less, Amortized cost	$ 158.5
Due after 1 year through 5 years, Amortized cost	536.7
Due after 5 years through 10 years, Amortized cost	165.9
Due after 10 years, Amortized cost	556.1
U.S. government agencies mortgage-backed securities, Amortized cost	730.3
Total, Amortized cost	2,147.5	$ 2,117.0
Fair value
Due in 1 year or less, Fair value	159.7
Due after 1 year through 5 years, Fair value	562.2
Due after 5 years through 10 years, Fair value	170.5
Due after 10 years, Fair value	582.3
U.S. government agencies mortgage-backed securities, Fair value	734.3
Total, Fair value	$ 2,209.0	$ 2,237.2

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Investments - Components of Net Investment Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Investment Income [Line Items]
Investment income	$ 17.9	$ 19.2
Investment expenses	0.3	0.3
Net investment income	17.6	18.9
Equity Securities [Member]
Net Investment Income [Line Items]
Investment income	1.6	3.1
Cash and Cash Equivalents, and Other [Member]
Net Investment Income [Line Items]
Investment income	0.9	1.0
Fixed Maturities [Member]
Net Investment Income [Line Items]
Investment income	$ 15.4	$ 15.1

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Investments - Realized and Unrealized Holding Gains (Losses) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Securities, Realized Gain (Loss):
Debt Securities, Available-for-sale, Realized Gain	$ 3.0	$ 3.6
Debt Securities, Available-for-sale, Realized Loss	(1.5)	(1.2)
Debt Securities, Available-for-sale, Net Realized Gain (Loss)	1.5	2.4
Equity Securities, FV-NI, Gain (Loss)
Other net realized loss	0.0	(0.2)
Gain (Loss) on Investments	38.2	(135.2)
Change in unrealized holding gains (losses), net of tax:
Change in net unrealized holding (losses) gains, net of tax	(58.7)	28.6
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	12.4	(6.0)
Total net unrealized holding (loss) gains on available-for-sale investments	(46.3)	22.6
Equity Securities, FV-NI, Unrealized Gain	27.8
Equity Securities, FV-NI, Unrealized Loss	(123.3)
Equity Securities [Member]
Equity Securities, FV-NI, Gain (Loss)
Equity Securities, FV-NI, Net Gain (Loss)	31.5	(122.4)
Other Invested Assets [Member]
Equity Securities, FV-NI, Gain (Loss)
Equity Securities, FV-NI, Net Gain (Loss)	5.2	$ (15.4)
Change in unrealized holding gains (losses), net of tax:
Equity Securities, FV-NI, Unrealized Gain	5.2
Equity Securities, FV-NI, Unrealized Loss	$ (15.4)

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Investments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	$ 30.2
Fixed maturities fair value of deposit with insurance regulators	9.4		$ 9.7
Proceeds on sale of available-for-sale securities	137.4	$ 97.1
Federal Home Loan Bank of Cincinnati [Member]
Debt Securities, Available-for-sale [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 106.5

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Fair Value of Financial Instruments - Company's Available-for-Sale Investments within Fair Value Hierarchy (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	$ 2,209.0	$ 2,237.2
Investments, Fair Value Disclosure	2,624.4	2,642.2
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	471.0	551.7
Investments, Fair Value Disclosure	471.0	551.7
Obligations of States and Political Subdivisions [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	500.5	541.5
Investments, Fair Value Disclosure	500.5	541.5
Corporate Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	503.2	483.3
Investments, Fair Value Disclosure	503.2	483.3
U.S. Government Agencies Mortgage-Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	734.3	660.7
Investments, Fair Value Disclosure	734.3	660.7
Fixed Maturities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	2,209.0	2,237.2
Large-Cap Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	149.2	134.2
Mutual and exchange traded funds [Domain] [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	250.4	255.5
Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	399.6	389.7
Other Invested Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	15.8	15.3
Level 1 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	415.4	405.0
Level 1 [Member] | U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	0.0	0.0
Level 1 [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	0.0	0.0
Level 1 [Member] | Corporate Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	0.0	0.0
Level 1 [Member] | U.S. Government Agencies Mortgage-Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	0.0	0.0
Level 1 [Member] | Fixed Maturities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	0.0	0.0
Level 1 [Member] | Large-Cap Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	149.2	134.2
Level 1 [Member] | Mutual and exchange traded funds [Domain] [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	250.4	255.5
Level 1 [Member] | Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	399.6	389.7
Level 1 [Member] | Other Invested Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	15.8	15.3
Level 2 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	2,209.0	2,237.2
Level 2 [Member] | U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	471.0	551.7
Level 2 [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	500.5	541.5
Level 2 [Member] | Corporate Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	503.2	483.3
Level 2 [Member] | U.S. Government Agencies Mortgage-Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	734.3	660.7
Level 2 [Member] | Fixed Maturities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	2,209.0	2,237.2
Level 2 [Member] | Large-Cap Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	0.0	0.0
Level 2 [Member] | Mutual and exchange traded funds [Domain] [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	0.0	0.0
Level 2 [Member] | Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	0.0	0.0
Level 2 [Member] | Other Invested Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	$ 0.0	$ 0.0

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Fair Value of Financial Instruments - Company Estimates Receivable from Affiliate using Market Quotations for U.S. Treasury Securities (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Period End Date	Mar. 31, 2021
Note Receivable from Affiliate, 2019 [Member] | Affiliated Entity [Member] | Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable interest rate (percent)	4.05%	4.05%
Reported Value Measurement [Member] | Note Receivable from Affiliate, 2019 [Member] | Affiliated Entity [Member] | Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable from affiliate	$ 70.0		$ 70.0
Estimate of Fair Value Measurement [Member] | Note Receivable from Affiliate, 2019 [Member] | Affiliated Entity [Member] | Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable from affiliate	$ 76.6		$ 80.4

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Fair Value of Financial Instruments - Included in Notes Payable are the FHLB loan and Subordinated Debentures (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Document Period End Date	Mar. 31, 2021
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 21,500,000
Federal Home Loan Bank Advances due 2030 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	1.37%	1.37%
Debt Instrument, Face Amount	$ 21,500,000
Federal Home Loan Bank of Cincinnati [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 85,000,000.0
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate (percent)	3.96%	3.96%
Affiliate Subordinated Debentures Due 2033 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	4.39%	4.43%
Debt Instrument, Face Amount	$ 15,500,000
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Total notes payable	122,100,000	$ 122,100,000
Reported Value Measurement [Member] | Federal Home Loan Bank Advances due 2030 [Member]
Debt Instrument [Line Items]
Total notes payable	21,500,000	21,500,000
Reported Value Measurement [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Total notes payable	85,300,000	85,300,000
Reported Value Measurement [Member] | Affiliate Subordinated Debentures Due 2033 [Member]
Debt Instrument [Line Items]
Total notes payable	15,300,000	15,300,000
Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Total notes payable	136,700,000	144,000,000.0
Estimate of Fair Value Measurement [Member] | Federal Home Loan Bank Advances due 2030 [Member]
Debt Instrument [Line Items]
Total notes payable	20,200,000	21,600,000
Estimate of Fair Value Measurement [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Total notes payable	101,200,000	107,100,000
Estimate of Fair Value Measurement [Member] | Affiliate Subordinated Debentures Due 2033 [Member]
Debt Instrument [Line Items]
Total notes payable	$ 15,300,000	$ 15,300,000

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Fair Value of Financial Instruments - Additional Information (Detail) $ in Millions	1 Months Ended
	May 31, 2009 Agreement	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurements Disclosure [Line Items]
Other invested assets		$ 76.4	$ 71.1
Other invested assets, at cost		11.8	12.1
Number of Credit Agreements | Agreement	2
Notes receivable from affiliate		70.0	70.0
Level 3 [Member]
Fair Value Measurements Disclosure [Line Items]
Federal home loan bank stock		11.3
Other invested assets, at cost		$ 0.5
International funds [Member]
Fair Value Measurements Disclosure [Line Items]
Number of available for sale securities		1
Other invested assets		$ 60.6	$ 55.8
Affiliated Entity [Member]
Fair Value Measurements Disclosure [Line Items]
Notes receivable from affiliate		$ 70.0

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Deferred Acquisition Costs Deferred Acquisition Costs (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Period Start	$ 122.2	$ 111.1
Deferred Policy Acquisition Cost, Capitalization	60.6	91.1
Deferred Policy Acquisition Costs, Disposition	(61.6)	(88.9)
Deferred Policy Acquisition Cost, Period End	$ 121.2	$ 113.3

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Losses and Loss Expenses Payable Losses and Loss Expenses Payable - Schedule of Activity in Liability for Unpaid Losses and Loss Expenses Payable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Abstract]
Liability for Claims and Claims Adjustment Expense, Property Casualty Liability	$ 1,066.3	$ 1,086.6	$ 1,050.4	$ 1,066.5
Reinsurance Recoverables, Including Reinsurance Premium Paid	23.6	39.7	24.3	13.6
Liability for Unpaid Claims and Claims Adjustment Expense, Net	1,042.7	1,046.9	$ 1,026.1	$ 1,052.9
Current Year Claims and Claims Adjustment Expense	311.3	246.9
Prior Year Claims and Claims Adjustment Expense	(30.5)	(7.5)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	280.8	239.4
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	105.7	74.1
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	158.5	171.3
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	$ 264.2	$ 245.4

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Losses and Loss Expenses Payable Losses and Loss Expenses Payable - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ (30.5)	$ (7.5)
Personal Insurance Segments [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(2.9)	6.4
Homeowners [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(2.1)	(2.2)
Middle Market Commercial [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(8.1)	(5.1)
Personal Auto [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense		5.2
Workers' compensation [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(8.5)	(4.0)
Small commercial [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense		(5.4)
Total Insurance Segments [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(24.6)	$ (10.5)
Business Insurance Segments [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(21.8)
Total Insurance Segments [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ (3.8)

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Reinsurance - Summary of External Reinsurance Transactions, as well as reinsurance transactions with State Auto Mutual Under the Pooling Arrangement (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Premiums earned:
Assumed from external insurers and reinsurers	$ 21.8	$ 20.6
Assumed under Pooling Arrangement	355.9	330.5
Ceded to external insurers and reinsurers	(9.0)	(10.6)
Ceded under Pooling Arrangement	(277.9)	(272.2)
Net assumed premiums earned	90.8	68.3
Losses and loss expenses incurred:
Assumed from external insurers and reinsurers	14.5	11.7
Assumed under Pooling Arrangement	280.8	239.4
Ceded to external insurers and reinsurers	(3.3)	(33.5)
Ceded under Pooling Arrangement	(167.1)	(228.5)
Net assumed losses and loss expenses incurred	$ 124.9	$ (10.9)

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Income Taxes - Reconciliation Between Actual Federal Income Tax Expense (Benefit) and Amount Computed at Indicated Statutory Rate (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Amount at statutory rate	$ 1.2	$ (30.2)
Tax-exempt interest and dividends received deduction	(0.6)	(0.7)
Other, net	1.4	1.5
Federal income tax expense and effective rate	2.0	(29.4)
Income Tax Expense (Benefit)	$ 2.0	$ (29.4)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Amount at statutory rate (percent)	21.00%	21.00%
Tax-exempt interest and dividends received deduction (percent)	(11.30%)	0.50%
Other, net (percent)	26.60%	(1.10%)
Effective Income Tax Rate Reconciliation, Deduction, Percent	36.30%	20.40%

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Pension and Postretirement Benefit Plans - Company's Share of Net Periodic Cost Components (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.3	$ 1.2
Interest cost	2.1	2.4
Expected return on plan assets	(4.3)	(4.4)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.0	0.0
Amortization of:
Defined Benefit Plan, Amortization of Gain (Loss)	3.5	2.3
Net periodic cost (benefit)	2.6	1.5
Postretirement [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.0	0.0
Interest cost	0.0	0.1
Expected return on plan assets	0.0	0.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(1.4)	(1.4)
Amortization of:
Defined Benefit Plan, Amortization of Gain (Loss)	0.0	0.1
Net periodic cost (benefit)	$ (1.4)	$ (1.2)

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Pension and Postretirement Benefit Plans - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Retirement Benefits [Abstract]
Contributions by employer	$ 5.0
Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year	$ 10.0

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Other Comprehensive Income and Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income by Component, Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	$ 13.9	$ (37.9)
Other comprehensive income before reclassifications	(45.1)	24.5
Amounts reclassified from AOCI	1.1	(0.3)
Other comprehensive (loss) income	(44.0)	24.2
Ending balance	(30.1)	(13.7)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Amounts reclassified from AOCI	1.1	(0.3)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	97.5	40.4
Other comprehensive income before reclassifications	(45.1)	24.5
Amounts reclassified from AOCI	(1.2)	(1.9)
Other comprehensive (loss) income	(46.3)	22.6
Ending balance	51.2	63.0
Benefit Plan Items [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(83.6)	(78.3)
Other comprehensive income before reclassifications	0.0	0.0
Amounts reclassified from AOCI	2.3	1.6
Other comprehensive (loss) income	2.3	1.6
Ending balance	$ (81.3)	$ (76.7)

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Other Comprehensive Income and Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gain/(loss) on sale of securities	$ 38.2	$ (135.2)
Tax (expense) benefit	(2.0)	29.4
Total reclassifications for the period	(1.1)	0.3
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	1.2	1.9
Benefit Plan Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	(2.3)	(1.6)
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	(1.1)	0.3
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gain/(loss) on sale of securities	1.5	2.4
Total before tax	1.5	2.4
Tax (expense) benefit	(0.3)	(0.5)
Net of tax	1.2	1.9
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Benefit Plan Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income components/Negative prior-service costs	1.6	1.6
Accumulated other comprehensive income components/Net actuarial loss	(4.5)	(3.7)
Total before tax	(2.9)	(2.1)
Tax (expense) benefit	0.6	0.5
Net of tax	$ (2.3)	$ (1.6)

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Earnings Per Common Share - Compilation of Basic and Diluted Earnings (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income (loss)	$ 3.6	$ (114.6)
Denominator:
Weighted average shares for basic net earnings per common share (shares)	43.9	43.7
Effect of dilutive share-based awards (shares)	0.7	0.0
Adjusted weighted average shares for diluted net earnings per common share (shares)	44.6	43.7
Basic net (loss) earnings per common share (usd per share)	$ 0.08	$ (2.62)
Diluted net (loss) earnings per common share (usd per share)	$ 0.08	$ (2.62)

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Earnings Per Common Share - Options to Purchase Shares of Common Stock (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Number of antidilutive options and awards	0.0	0.5

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Segment Information - Financial Information Regarding Company's Reportable Segments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues from external sources:
Revenue	$ 412.2	$ 214.8
Other Income	0.5	0.6
Net Investment Income	17.6	18.9
Realized Investment Gains (Losses)	38.2	(135.2)
Segment income before federal income tax:
Interest expense on corporate debt	(1.1)	(1.2)
Income before federal income taxes	5.6	(144.0)
Operating Segments [Member]
Revenues from external sources:
Revenue	412.2	214.8
Segment income before federal income tax:
Income before federal income taxes	11.0	(146.3)
Operating Segments [Member] | Personal Insurance Segments [Member]
Revenues from external sources:
Revenue	207.8	198.1
Operating Segments [Member] | Business Insurance Segments [Member]
Revenues from external sources:
Revenue	148.7	132.4
Operating Segments [Member] | Specialty Insurance Segment [Member]
Revenues from external sources:
Revenue	(0.6)	0.0
Operating Segments [Member] | Total Insurance Segments [Member]
Revenues from external sources:
Revenue	355.9	330.5
Segment income before federal income tax:
Income before federal income taxes	(44.8)	(30.1)
Operating Segments [Member] | Net Investment Income [Member]
Revenues from external sources:
Net Investment Income	17.6	18.9
Operating Segments [Member] | Total Investment Operations [Member]
Revenues from external sources:
Revenue	55.8	(116.3)
Segment income before federal income tax:
Income before federal income taxes	55.8	(116.3)
Operating Segments [Member] | Total Investment Operations [Member] | Net Realized Capital Gains [Member]
Revenues from external sources:
Realized Investment Gains (Losses)		(135.2)
Segment income before federal income tax:
Income before federal income taxes	38.2	(135.2)
Operating Segments [Member] | All Other Segments [Member]
Revenues from external sources:
Revenue		0.6
Segment income before federal income tax:
Income before federal income taxes	0.0	0.1
Operating Segments [Member] | Personal Insurance [Member]
Segment income before federal income tax:
Income before federal income taxes	(49.4)	0.3
Operating Segments [Member] | Business Insurance [Member]
Segment income before federal income tax:
Income before federal income taxes	3.0	(30.0)
Operating Segments [Member] | Specialty Insurance [Member]
Segment income before federal income tax:
Income before federal income taxes	1.6	(0.4)
Eliminate Intersegment Revenues [Member]
Revenues from external sources:
Revenue	1.6	1.6
Segment Reconciling Items [Member]
Revenues from external sources:
Revenue	(1.6)	(1.6)
Segment income before federal income tax:
Corporate Expenses	(3.0)	(2.4)
Income before federal income taxes	(5.4)	2.3
Segment Reconciling Items [Member] | Segment Reconciling Items [Member]
Segment income before federal income tax:
Gaap Expense Adjustments	(1.3)	5.9
Interest expense on corporate debt	1.1	1.2
Corporate And Reconciling Items [Member]
Revenues from external sources:
Revenue	$ 413.8	$ 216.4

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Segment Information - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Acquisition And Operating Expenses	$ 121.0	$ 114.9
Investable assets	$ 2,825.9		$ 2,870.8