Kemper (KMPR) 10-Q 28 Oct 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - $ / shares	9 Months Ended
	Sep. 30, 2021	Oct. 26, 2021	Dec. 31, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-18298
Entity Registrant Name	Kemper Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4255452
Entity Address, Address Line One	200 E. Randolph Street
Entity Address, Address Line Two	Suite 3300
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60601
City Area Code	312
Local Phone Number	661-4600
Title of 12(b) Security	Common Stock, par value $0.10 per share
Trading Symbol	KMPR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		63,653,144
Entity Central Index Key	0000860748
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common stock, par value (in dollars per share)	$ 0.10		$ 0.10

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Earned Premiums	$ 1,356.1	$ 1,206.5	$ 3,894.6	$ 3,458.2
Net Investment Income	101.9	92.1	318.9	245.5
Change in Value of Alternative Energy Partnership Investments	(23.8)	0	(46.9)	0
Other Income (Loss)	12.3	0.9	20.8	92.7
Income (Loss) from Change in Fair Value of Equity and Convertible Securities	(0.6)	45.2	92.4	(1)
Net Realized Gains on Sales of Investments	10.1	10	43.1	38.2
Impairment Losses	(0.6)	(1)	(7.8)	(20)
Total Revenues	1,455.4	1,353.7	4,315.1	3,813.6
Expenses:
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses	1,211.2	877.5	3,324.8	2,460.2
Insurance Expenses	311.3	276.9	909	821.2
Interest and Other Expenses	62.7	47.2	179.2	142.7
Total Expenses	1,585.2	1,201.6	4,413	3,424.1
Income (Loss) before Income Taxes	(129.8)	152.1	(97.9)	389.5
Income Tax Benefit (Expense)	54.5	(29.8)	83.2	(77.1)
Net Income (Loss)	$ (75.3)	$ 122.3	$ (14.7)	$ 312.4
Net Income (Loss) Per Unrestricted Share:
Basic (in dollars per share)	$ (1.18)	$ 1.87	$ (0.23)	$ 4.75
Diluted (in dollars per share)	$ (1.18)	$ 1.83	$ (0.23)	$ 4.67

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Income (Loss)	$ (75.3)	$ 122.3	$ (14.7)	$ 312.4
Other Comprehensive Income (Loss) Before Income Taxes:
Decrease (Increase) in Net Unrecognized Postretirement Benefit Costs	(0.1)	0.9	0.3	2.3
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	0.1	0.2	0.3	0.3
Total Other Comprehensive Income (Loss) Before Income Taxes	(80.3)	65.5	(255.3)	269.5
Other Comprehensive Income Tax Benefit (Expense)	16.7	(13.8)	54.2	(56.6)
Other Comprehensive Income (Loss), Net of Taxes	(63.6)	51.7	(201.1)	212.9
Total Comprehensive Income (Loss)	(138.9)	174	(215.8)	525.3
No Credit Losses Recognized in Condensed Consolidated Statements of Income
Other Comprehensive Income (Loss) Before Income Taxes:
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities with:	(80.8)	63.1	(254)	269.3
Credit Losses Recognized in Condensed Consolidated Statements of Income
Other Comprehensive Income (Loss) Before Income Taxes:
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities with:	$ 0.5	$ 1.3	$ (1.9)	$ (2.4)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments:
Fixed Maturities at Fair Value (Amortized Cost: 2021 - $7,222.5; 2020 - $6,692.7 Allowance for Credit Losses: 2021 - $4.4; 2020 - $3.3)	$ 7,885.1	$ 7,605.9
Equity Securities at Fair Value (Cost: 2021 - $725.1; 2020 - $684.1)	969.6	858.5
Equity Securities at Modified Cost	33	40.1
Convertible Securities at Fair Value	44.1	39.9
Short-term Investments at Cost which Approximates Fair Value	259.7	875.4
Other Investments	921.5	779
Total Investments	10,422.3	10,424.1
Cash	119.8	206.1
Premiums Receivable, Net	1,481.2	1,194.5
Other Receivables	207.3	222.4
Deferred Policy Acquisition Costs	676.6	589.3
Goodwill	1,312	1,114
Current Income Tax Assets	138.7	15.6
Other Assets	619.3	575.9
Total Assets	14,977.2	14,341.9
Insurance Reserves:
Life and Health	3,524.1	3,527.5
Property and Casualty	2,596.2	1,982.5
Total Insurance Reserves	6,120.3	5,510
Unearned Premiums	1,965.7	1,615.1
Policyholder Obligations	481.8	467
Deferred Income Tax Liabilities	242.4	285.7
Accrued Expenses and Other Liabilities	893.7	727.9
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2021 - $1,166.1; 2020 - $1,247.8)	1,122.1	1,172.8
Total Liabilities	10,826	9,778.5
Shareholders’ Equity:
Common Stock, $0.10 Par Value, 100,000,000 Shares Authorized; 63,651,526 Shares Issued and Outstanding at September 30, 2021 and 65,436,207 Shares Issued and Outstanding at December 31, 2020	6.4	6.5
Paid-in Capital	1,777	1,805.2
Retained Earnings	1,888.4	2,071.2
Accumulated Other Comprehensive Income	479.4	680.5
Total Shareholders’ Equity	4,151.2	4,563.4
Total Liabilities and Shareholders’ Equity	14,977.2	14,341.9
Equity Method Limited Liability Investments
Investments:
Equity Method Investments	255.1	204
Alternative Energy Partnership Investments
Investments:
Equity Method Investments	$ 54.2	$ 21.3

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed maturities, at amortized cost	$ 7,222,500,000	$ 6,692,700,000
Fixed maturities, allowance for credit losses	(4,400,000)	(3,300,000)
Equity securities, at cost	725,100,000	684,100,000
Premium receivables, allowance for credit losses	12,700,000	20,900,000
Long-term Debt	$ 1,166,100,000	$ 1,247,800,000
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)		100,000,000
Common stock, shares outstanding (in shares)	63,651,526	65,436,207

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities:
Net Income (Loss)	$ (14,700,000)	$ 312,400,000
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:
Net Realized Investment (Gains) Losses	(43,100,000)	(38,200,000)
Impairment Losses	7,800,000	20,000,000
Depreciation and Amortization of Property, Equipment and Software	32,800,000	26,600,000
Amortization of Intangibles Assets Acquired	46,400,000	14,100,000
(Increase) Decrease in Value of Equity and Convertible Securities	(92,400,000)	1,000,000
Receivables from Policyholders	(137,700,000)	(132,200,000)
Reinsurance Recoverables	24,400,000	13,800,000
Deferred Policy Acquisition Costs	(87,300,000)	(40,500,000)
Insurance Reserves	429,800,000	(10,300,000)
Unearned Premiums	172,900,000	136,100,000
Income Taxes	(121,500,000)	22,000,000
Other Assets and Liabilities	94,200,000	(79,100,000)
Net Cash Provided by Operating Activities	307,600,000	251,300,000
Cash Flows from Investing Activities:
Proceeds from Sales, Calls and Maturities of Fixed Maturities	1,015,600,000	707,000,000
Proceeds from Sale of Equity Securities, FV-NI	139,700,000	436,500,000
Proceeds from the Sales or Paydowns of Investments:
Real Estate Investments	6,200,000	5,400,000
Mortgage Loans	53,100,000	18,600,000
Other Investments	39,700,000	26,500,000
Purchases of Investments:
Fixed Maturities	(1,322,200,000)	(1,009,700,000)
Payments to Acquire Equity Securities, FV-NI	106,000,000	324,400,000
Real Estate Investments	(3,600,000)	(500,000)
Company-Owned Life Insurance	(100,000,000)	(100,000,000)
Mortgage Loans	(94,000,000)	(22,700,000)
Other Investments	(92,100,000)	(17,900,000)
Net Sales (Purchases) of Short-term Investments	715,100,000	(147,900,000)
Payments to Acquire Businesses, Net of Cash Acquired	(316,600,000)	0
Acquisition of Software and Long-lived Assets	(43,900,000)	(46,200,000)
Other	10,000,000	6,000,000
Net Cash Provided by (Used in) Investing Activities	(99,000,000)	(469,300,000)
Cash Flows from Financing Activities:
Repayment of Long-term Debt	(50,000,000)	0
Net Proceeds from Issuance of Long-term Debt	0	395,600,000
Proceeds from Policyholder Obligations	298,100,000	391,800,000
Repayment of Policyholder Obligations	(328,100,000)	(192,400,000)
Proceeds from Shares Issued under Employee Stock Purchase Plan	3,900,000	3,100,000
Common Stock Repurchases	(161,700,000)	(110,400,000)
Dividends and Dividend Equivalents Paid	(60,800,000)	(59,300,000)
Other	3,700,000	5,000,000
Net Cash (Used in) Provided by Financing Activities	(294,900,000)	433,400,000
Increase (Decrease) in Cash	(86,300,000)	215,400,000
Cash, Beginning of Year	206,100,000	136,800,000
Cash, End of Period	119,800,000	352,200,000
Equity Method Limited Liability Investments
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:
Income (Loss) from Equity Method Investments	50,900,000	(5,600,000)
Alternative Energy Partnership Investments
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:
Income (Loss) from Equity Method Investments	$ (46,900,000)	$ 0

Consolidated Statements of Shar

Consolidated Statements of Shareholders’ Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2019		66.7
Beginning balance at Dec. 31, 2019	$ 3,972.3	$ 6.7	$ 1,819.2	$ 1,810.3	$ 336.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	312.4			312.4
Other Comprehensive Income (Loss), Net of Tax	212.9				212.9
Cash Dividends and Dividend Equivalents to Shareholders	(59.6)			(59.6)
Repurchases of Common Stock (in shares)		1.6
Repurchases of Common Stock (Note 10)	(110.4)	$ (0.2)	(44.2)	(66)
Shares Issued Under Employee Stock Purchase Plan			3.1
Shares Issued Under Employee Stock Purchase Plan	3.1
Equity-based Compensation Cost	19.7		19.7
Equity-based Awards, Net of Shares Exchanged (in shares)		0.3
Equity-based Awards, Net of Shares Exchanged	(2.9)	$ 0	0.7	(3.6)
Ending balance (in shares) at Sep. 30, 2020		65.4
Ending balance at Sep. 30, 2020	4,347.5	$ 6.5	1,798.5	1,993.5	549
Beginning balance (in shares) at Jun. 30, 2020		65.3
Beginning balance at Jun. 30, 2020	4,187.9	$ 6.5	1,792.5	1,891.6	497.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	122.3			122.3
Other Comprehensive Income (Loss), Net of Tax	51.7				51.7
Cash Dividends and Dividend Equivalents to Shareholders	(19.7)			(19.7)
Shares Issued Under Employee Stock Purchase Plan	1.2		1.2
Equity-based Compensation Cost	6.1		6.1
Equity-based Awards, Net of Shares Exchanged (in shares)		0.1
Equity-based Awards, Net of Shares Exchanged	(2)	$ 0	(1.3)	(0.7)
Ending balance (in shares) at Sep. 30, 2020		65.4
Ending balance at Sep. 30, 2020	4,347.5	$ 6.5	1,798.5	1,993.5	549
Beginning balance (in shares) at Dec. 31, 2020		65.4
Beginning balance at Dec. 31, 2020	4,563.4	$ 6.5	1,805.2	2,071.2	680.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(14.7)			(14.7)
Other Comprehensive Income (Loss), Net of Tax	(201.1)				(201.1)
Cash Dividends and Dividend Equivalents to Shareholders	(61.1)			(61.1)
Repurchases of Common Stock (in shares)		2.1
Repurchases of Common Stock (Note 10)	(161.7)	$ (0.2)	(57.8)	(103.7)
Shares Issued Under Employee Stock Purchase Plan	3.9	$ 0.1	3.9
Equity-based Compensation Cost	24.6		24.6
Equity-based Awards, Net of Shares Exchanged (in shares)		0.3
Equity-based Awards, Net of Shares Exchanged	(2.1)	$ 0.1	1.1	(3.3)
Ending balance (in shares) at Sep. 30, 2021		63.7
Ending balance at Sep. 30, 2021	4,151.2	$ 6.4	1,777	1,888.4	479.4
Beginning balance (in shares) at Jun. 30, 2021		63.6
Beginning balance at Jun. 30, 2021	4,306.2	$ 6.4	1,770.9	1,985.9	543
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(75.3)			(75.3)
Other Comprehensive Income (Loss), Net of Tax	(63.6)				(63.6)
Cash Dividends and Dividend Equivalents to Shareholders	(19.7)			(19.7)
Repurchases of Common Stock (in shares)		0.1
Repurchases of Common Stock (Note 10)	(3)	$ 0	(1.1)	(1.9)
Shares Issued Under Employee Stock Purchase Plan	1.4	$ 0.1	1.4
Equity-based Compensation Cost	6.1		6.1
Equity-based Awards, Net of Shares Exchanged (in shares)		0.1
Equity-based Awards, Net of Shares Exchanged	(0.9)	$ 0	(0.3)	(0.6)
Ending balance (in shares) at Sep. 30, 2021		63.7
Ending balance at Sep. 30, 2021	$ 4,151.2	$ 6.4	$ 1,777	$ 1,888.4	$ 479.4

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Accounting Policies	Basis of Presentation and Accounting Policies The unaudited interim Condensed Consolidated Financial Statements included herein have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) on a basis consistent with reporting interim financial information pursuant to the rules and regulations for Form 10-Q and Article 10 of Regulation S-X of the SEC and include the accounts of Kemper Corporation and its subsidiaries. All intercompany accounts and transactions have been eliminated. Certain financial information that is included in annual financial statements, including certain financial statement footnote disclosures, prepared in accordance with GAAP is not required by the rules and regulations of the SEC for interim financial reporting and has been condensed or omitted. In the opinion of the Company’s management, the Condensed Consolidated Financial Statements include all adjustments necessary to fairly present the financial position, results of operations and cash flows for the interim periods presented. The preparation of interim financial statements requires significant management estimates. Due to this factor and other factors, such as the seasonal nature of some portions of the insurance business, as well as market conditions and the impacts of COVID-19, annualizing the results of operations for the nine months ended September 30, 2021 would not necessarily be indicative of the results expected for the full fiscal year. The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the Company’s Consolidated Financial Statements and related notes included in Kemper’s Annual Report for the year ended December 31, 2020. During the first quarter of 2021, the Company elected to begin displaying its investments in Alternative Energy Partnerships in the Condensed Consolidated Statements of Income and Condensed Consolidated Balance Sheets as Change in Value of Alternative Energy Partnership Investments and Alternative Energy Partnership Investments, respectively. These were previously reported in Equity Method Limited Liability Investments on the Condensed Consolidated Balance Sheets. Impacts to prior period presentation are not material. Adoption of New Accounting Guidance Guidance Adopted in 2021 In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes . ASU 2019-12 is intended to simplify accounting for income taxes by eliminating certain exceptions to the guidance in ASC Topic 740, Income Taxes , related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period, and the recognition of deferred tax liabilities for outside basis differences. ASU 2019-12 also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. Further, ASU 2019-12 clarifies that single-member limited liability companies and similar disregarded entities that are not subject to income tax are not required to recognize an allocation of consolidated income tax expense in their separate financial statements, but they could elect to do so. ASU 2019-12 is effective for annual periods beginning after December 15, 2020 and interim periods within those annual periods. The adoption of ASU 2019-12 did not have a material effect on the Company’s interim Condensed Consolidated Financial Statements. In January 2020, the FASB issued ASU 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815): Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the FASB Emerging Issues) , which clarifies the interaction of the accounting for equity securities under Topic 321 and investments accounted for under the equity method of accounting in Topic 323 and the accounting for certain forward contracts and purchased options accounted for under Topic 815. ASU 2020-01 is effective for annual periods beginning after December 15, 2020 and interim periods within those annual periods. The adoption of ASU 2020-01 did not have a material effect on the Company’s interim Condensed Consolidated Financial Statements. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting , which provides optional expedients and exceptions for applying generally accepted accounting principles to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The guidance in ASU 2020-04, if elected, shall apply to contract modifications if the terms that are modified directly replace, or have the potential to replace, a reference rate with another interest rate index. If other terms are Note 1 - Basis of Presentation and Accounting Policies (Continued) contemporaneously modified in a manner that changes, or has the potential to change, the amount or timing of contractual cash flows, the guidance in ASU 2020-04 shall apply only if those modifications are related to the replacement of a reference rate. ASU 2020-04 is effective for contract modifications made between March 12, 2020 through December 31, 2022. The adoption of ASU 2020-04 did not have a material effect on the Company’s interim Condensed Consolidated Financial Statements. The Company will continue to evaluate the impact of this guidance on its financial statements. In October 2020, the FASB issued ASU 2020-08, Codification Improvements to Subtopic 310-20, Receivables - Nonrefundable Fees and Other Costs , which clarifies that an entity should re-evaluate whether a callable debt security is within the scope of paragraph 310-20-35-33 for each reporting period. ASU 2020-08 is effective for annual periods beginning after December 15, 2020 and interim periods within those annual periods. The adoption of ASU 2020-08 did not have a material effect on the Company’s interim Condensed Consolidated Financial Statements. The Company has adopted all other recently issued accounting pronouncements with effective dates prior to January 1, 2021. There were no adoptions of such accounting pronouncements during the nine months ended September 30, 2021 that had a material impact on the Company’s interim Condensed Consolidated Financial Statements. Guidance Not Yet Adopted In August 2018, the FASB issued ASU 2018-12, Financial Services-Insurance (Topic 944): Targeted Improvements to Accounting for Long-Duration Contracts . ASU 2018-12 amends the accounting model for certain long-duration insurance contracts and requires the insurer to provide additional disclosures in annual and interim reporting periods. In November 2020, the FASB issued ASU 2020-11 which deferred the effective date of ASU 2018-12 by one year for public business entities. ASU 2018-12 is now effective for fiscal years beginning after December 15, 2022, and interim periods within those annual periods. The amendments in ASU 2018-12 (i) require cash flow assumptions used to measure the liability for future policy benefits for nonparticipating traditional and limited pay long duration contracts to be updated at least annually with the recognition and remeasurement recorded in net income, require the discount rate used in measuring the liability to be an upper-medium grade fixed-income instrument yield, which is to be updated at each reporting period, and recognized in other comprehensive income, (ii) simplify the amortization of deferred acquisition costs to be amortized on a constant level basis over the expected term of the contract, (iii) require all market risk benefits to be measured at fair value, and (iv) enhance certain presentation and disclosure requirements which include disaggregated rollforwards for liability for future policy benefits, policyholder account balances, market risk benefits, separate account liabilities, deferred acquisition costs, and information about significant inputs, judgments and methods used in the measurement. The Company plans to adopt using the modified retrospective transition method and is currently evaluating the impact of this guidance on its financial statements.

Net Income Per Unrestricted Sha

Net Income Per Unrestricted Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Net Income Per Unrestricted Share	Net Income Per Unrestricted Share The Company’s awards of deferred stock units granted to Kemper’s non-employee directors prior to 2019 contain rights to receive non-forfeitable dividend equivalents and participate in the undistributed earnings with common shareholders. Accordingly, the Company is required to apply the two-class method of computing basic and diluted earnings per share. A reconciliation of the numerator and denominator used in the calculation of Basic Net Income (Loss) Per Unrestricted Share and Diluted Net Income (Loss) Per Unrestricted Share for the nine and three months ended September 30, 2021 and 2020 is presented below. Note 2 - Net Income Per Unrestricted Share (Continued) Nine Months Ended Three Months Ended (Dollars in Millions, except per share amounts) Sep 30, Sep 30, Sep 30, Sep 30, Net Income (Loss) $ (14.7) $ 312.4 $ (75.3) $ 122.3 Less: Net Income Attributed to Participating Awards — 0.3 — 0.1 Net Income (Loss) Attributed to Unrestricted Shares (14.7) 312.1 (75.3) 122.2 Dilutive Effect on Income of Equity-based Compensation Equivalent Shares — — — — Diluted Net Income (Loss) Attributed to Unrestricted Shares $ (14.7) $ 312.1 $ (75.3) $ 122.2 (Number of Shares in Thousands) Weighted-average Unrestricted Shares Outstanding 64,469.9 65,710.8 63,628.1 65,362.5 Equity-based Compensation Equivalent Shares — 1,086.6 — 1,271.0 Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 64,469.9 66,797.4 63,628.1 66,633.5 (Per Unrestricted Share in Whole Dollars) Basic Net Income (Loss) Per Unrestricted Share $ (0.23) $ 4.75 $ (1.18) $ 1.87 Diluted Net Income (Loss) Per Unrestricted Share $ (0.23) $ 4.67 $ (1.18) $ 1.83 The number of shares of Kemper common stock that were excluded from the calculations of Equity-based Compensation Equivalent Shares and Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution for the nine and three months ended September 30, 2021 and 2020, because the effect of inclusion would be anti-dilutive, is presented below. Nine Months Ended Three Months Ended (Number of Shares in Thousands) Sep 30, Sep 30, Sep 30, Sep 30, Equity-based Compensation Equivalent Shares 2,205.4 873.3 2,170.2 876.1 Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 2,205.4 873.3 2,170.2 876.1

Acquisition of Business

Acquisition of Business	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisition of Business	Acquisition of Business Acquisition of American Access Casualty Corporation On April 1, 2021 Kemper completed the acquisition of American Access Casualty Company and its related captive insurance agency, Newins Insurance Agency Holdings, LLC, and its subsidiaries (collectively “AAC”). Pursuant to the agreement dated November 22, 2020, Kemper paid AAC’s equity holders total cash consideration of approximately $370.9 million. AAC, headquartered in Downers Grove, Illinois, provides specialty private passenger auto insurance in Arizona, Illinois, Indiana, Nevada, and Texas. AAC wrote over $350.0 million of direct premiums in 2020 through a network of approximately 600 independent agents and its captive agency force. The Company is in the process of finalizing the estimation of the fair value of acquired assets and assumed liabilities. Accordingly, the Company’s preliminary estimates and the allocation of the purchase price to the assets acquired and liabilities assumed may change as the Company completes the process, which would also likely impact the Company’s allocation of the purchase price to Goodwill. In accordance with Accounting Standards Codification (“ASC”) 805, Business Combinations , changes, if any, to the preliminary estimates and allocation will be reported in the Company’s financial statements as an adjustment to the opening balance sheet. Note 3 - Acquisition of Business (continued) Based on the Company’s allocation of the purchase price, the fair value of the assets acquired and liabilities assumed were: (Dollars in Millions) Fixed Maturities at Fair Value $ 151.2 Equity Securities at Fair Value 82.4 Short-term Investments at Cost which Approximates Fair Value 100.1 Cash 54.3 Receivables from Policyholders 148.9 Other Receivables 2.0 Goodwill 198.0 Current Income Tax Assets 0.3 Other Assets 81.4 Property and Casualty Insurance Reserves (211.1) Unearned Premiums (177.8) Deferred Income Tax Liabilities (7.8) Accrued Expenses and Other Liabilities (51.0) Total Purchase Price $ 370.9 The factors that contributed to the recognition of goodwill include synergies from economies of scale within the underwriting and claims operations, acquiring a talented workforce and cost savings opportunities. Intangible Assets Intangible assets consist of capitalized costs, primarily of the estimated fair value of distribution, customer relationships, policies in force, trade names and licenses, and technology. The estimated useful lives of these assets range from 1 to 8 years. These assets are reported in Other Assets in the Condensed Consolidated Balance Sheets. Identifiable definite and indefinite lived intangible assets acquired consisted of the following: (Dollars in Millions) Definite Life Intangibles Value of Business Acquired $ 42.9 Customer Relationships 4.8 Agent Relationships 7.2 Internal-Use Software 6.5 Trade Names 1.8 Indefinite Life Intangible Assets Insurance Licenses 2.5 Unaudited Pro Forma Results The following unaudited pro forma information presents the Company’s results of operations as if the acquisition of AAC occurred on January 1, 2020. The adjustments to arrive at the pro forma information below included adjustments for the lost investment income on the cash used to fund the acquisition, amortization of the acquired intangible assets and the exclusion of certain acquisition related costs considered to be non-recurring in nature. Note 3 - Acquisition of Business (continued) Nine Months Ended Three Months Ended (Dollars in millions) Sep 30, Sep 30, Sep 30, Sep 30, Total Revenues $ 4,406.3 $ 4,094.0 $ 1,455.4 $ 1,449.9 Total Expenses 4,484.9 3,685.9 1,583.6 1,293.5 Income (Loss) from Continuing Operations before Income Taxes (78.6) 408.1 (128.2) 156.4 Net Income (Loss) $ 0.1 $ 331.6 $ (74.1) $ 127.4 The pro forma information is not necessarily indicative of the consolidated results of operations that might have been achieved had the transaction in fact occurred at the beginning of the periods presented, nor does the information project results for any future period. The pro forma information does not include the impact of any future cost savings or synergies that may be achieved as a result of the acquisition.

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Business Segments	Business Segments The Company is engaged, through its subsidiaries, in the property and casualty insurance and life and health insurance businesses. The Company conducts its operations through three operating segments: Specialty Property & Casualty Insurance, Preferred Property & Casualty Insurance and Life & Health Insurance. The Specialty Property & Casualty Insurance segment’s principal products are specialty automobile insurance and commercial automobile insurance. The Preferred Property & Casualty Insurance segment’s principal products are preferred automobile insurance, homeowners insurance and other personal insurance. These products are distributed primarily through independent agents and brokers. The Life & Health Insurance segment’s principal products are individual life, accident, supplemental health and property insurance. These products are distributed by career agents employed by the Company and independent agents and brokers. Earned Premiums by product line for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Specialty Property & Casualty Insurance: Specialty Automobile $ 2,615.6 $ 2,235.2 $ 920.6 $ 792.2 Commercial Automobile 300.6 217.7 107.7 79.2 Preferred Property & Casualty Insurance: Personal Automobile 309.1 324.6 102.6 110.6 Homeowners 154.6 167.4 52.5 55.0 Other Personal Lines 25.4 27.0 8.6 8.9 Life & Health Insurance: Life 300.2 289.2 101.5 96.3 Accident and Health 142.3 149.1 47.0 48.9 Property 46.8 48.0 15.6 15.4 Total Earned Premiums $ 3,894.6 $ 3,458.2 $ 1,356.1 $ 1,206.5 Note 4 - Business Segments (continued) Segment Revenues, including a reconciliation to Total Revenues, for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Segment Revenues: Specialty Property & Casualty Insurance: Earned Premiums $ 2,916.2 $ 2,452.9 $ 1,028.3 $ 871.4 Net Investment Income 114.7 76.2 37.0 30.5 Change in Value of Alternative Energy Partnership Investments (22.3) — (11.3) — Other Income 3.1 1.4 1.2 0.4 Total Specialty Property & Casualty Insurance 3,011.7 2,530.5 1,055.2 902.3 Preferred Property & Casualty Insurance: Earned Premiums 489.1 519.0 163.7 174.5 Net Investment Income 51.5 24.3 16.1 10.3 Change in Value of Alternative Energy Partnership Investments (12.5) — (6.4) — Other Income — 0.1 — — Total Preferred Property & Casualty Insurance 528.1 543.4 173.4 184.8 Life & Health Insurance: Earned Premiums 489.3 486.3 164.1 160.6 Net Investment Income 151.9 146.0 48.4 50.7 Change in Value of Alternative Energy Partnership Investments (12.1) — (6.1) — Other Income 0.3 0.6 0.1 — Total Life & Health Insurance 629.4 632.9 206.5 211.3 Total Segment Revenues 4,169.2 3,706.8 1,435.1 1,298.4 Income (Loss) from Change in Fair Value of Equity and Convertible 92.4 (1.0) (0.6) 45.2 Net Realized Gains on Sales of Investments 43.1 38.2 10.1 10.0 Impairment Losses (7.8) (20.0) (0.6) (1.0) Other 18.2 89.6 11.4 1.1 Total Revenues $ 4,315.1 $ 3,813.6 $ 1,455.4 $ 1,353.7 Note 4 - Business Segments (continued) Segment Operating Income (Loss), including a reconciliation to Income (Loss) before Income Taxes, for the nine and three months ended September 30, 2021 and 2020 was: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Segment Operating Income (Loss): Specialty Property & Casualty Insurance $ (128.7) $ 309.4 $ (91.8) $ 149.9 Preferred Property & Casualty Insurance (27.8) (18.0) (17.4) (41.8) Life & Health Insurance 6.5 61.6 (5.9) 15.2 Total Segment Operating Income (Loss) (150.0) 353.0 (115.1) 123.3 Corporate and Other Operating Income (Loss) From: Partial Satisfaction of Judgment — 89.4 — — Other (40.8) (26.8) (15.5) (11.0) Corporate and Other Operating Income (Loss) (40.8) 62.6 (15.5) (11.0) Adjusted Consolidated Operating Income (Loss) (190.8) 415.6 (130.6) 112.3 Income (Loss) from Change in Fair Value of Equity and Convertible Securities 92.4 (1.0) (0.6) 45.2 Net Realized Gains on Sales of Investments 43.1 38.2 10.1 10.0 Impairment Losses (7.8) (20.0) (0.6) (1.0) Acquisition Related Transaction, Integration and Other Costs (34.8) (43.3) (8.1) (14.4) Income (Loss) before Income Taxes $ (97.9) $ 389.5 $ (129.8) $ 152.1 Segment Net Operating Income (Loss), including a reconciliation to Net Income (Loss), for the nine and three months ended September 30, 2021 and 2020 was: Nine Months Ended Three Months Ended (Dollars in Millions and Net of Income Taxes) Sep 30, Sep 30, Sep 30, Sep 30, Segment Net Operating Income (Loss): Specialty Property & Casualty Insurance $ (70.9) $ 246.8 $ (59.3) $ 119.2 Preferred Property & Casualty Insurance (5.1) (13.4) (6.4) (32.7) Life & Health Insurance 23.1 50.6 2.8 12.2 Total Segment Net Operating Income (Loss) (52.9) 284.0 (62.9) 98.7 Corporate and Other Net Operating Income (Loss) From: Partial Satisfaction of Judgment — 70.6 — — Other (35.1) (21.6) (12.9) (7.8) Total Corporate and Other Net Operating Income (Loss) (35.1) 49.0 (12.9) (7.8) Adjusted Consolidated Net Operating Income (Loss) (88.0) 333.0 (75.8) 90.9 Net Income (Loss) From: Change in Fair Value of Equity and Convertible Securities 73.0 (0.8) (0.5) 35.7 Net Realized Gains on Sales of Investments 34.0 30.2 7.9 7.9 Impairment Losses (6.2) (15.8) (0.5) (0.8) Acquisition Related Transaction, Integration and Other Costs (27.5) (34.2) (6.4) (11.4) Net Income (Loss) $ (14.7) $ 312.4 $ (75.3) $ 122.3

Property and Casualty Insurance

Property and Casualty Insurance Reserves	9 Months Ended
	Sep. 30, 2021
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]
Property and Casualty Insurance Reserves	Property and Casualty Insurance Reserves Property and casualty insurance reserve activity for the nine months ended September 30, 2021 and 2020 was: Nine Months Ended (Dollars in Millions) Sep 30, Sep 30, Property and Casualty Insurance Reserves: Gross of Reinsurance at Beginning of Year $ 1,982.5 $ 1,969.8 Less Reinsurance Recoverables at Beginning of Year 50.1 65.6 Property and Casualty Insurance Reserves - Net of Reinsurance at Beginning of Year 1,932.4 1,904.2 Property and Casualty Insurance Reserves Acquired, Net of Reinsurance 211.1 — Incurred Losses and LAE Related to: Current Year 2,885.7 2,132.3 Prior Years 107.9 28.3 Total Incurred Losses and LAE 2,993.6 2,160.6 Paid Losses and LAE Related to: Current Year 1,503.9 1,133.7 Prior Years 1,080.4 1,032.9 Total Paid Losses and LAE 2,584.3 2,166.6 Property and Casualty Insurance Reserves - Net of Reinsurance at End of Period 2,552.8 1,898.2 Plus Reinsurance Recoverables at End of Period 43.4 51.8 Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period $ 2,596.2 $ 1,950.0 Property and casualty insurance reserves are estimated based on historical experience patterns and current economic trends. Actual loss experience and loss trends are likely to differ from these historical experience patterns and economic conditions. Loss experience and loss trends emerge over several years from the dates of loss inception. The Company monitors such emerging loss trends on a quarterly basis. Changes in such estimates are included in the Condensed Consolidated Statements of Income in the period of change. For the nine months ended September 30, 2021, the Company increased its property and casualty insurance reserves by $107.9 million to recognize adverse development of loss and LAE reserves from prior accident years. Specialty personal automobile insurance loss and LAE reserves developed adversely by $97.0 million due primarily to the emergence of more adverse loss patterns than expected for liability insurance. Commercial automobile insurance loss and LAE reserves developed adversely by $8.3 million due primarily to the emergence of more adverse loss patterns than expected for liability insurance. Preferred personal automobile insurance loss and LAE reserves developed adversely by $4.9 million due primarily to the emergence of more adverse patterns than expected for liability insurance. Homeowners loss and LAE reserves developed favorably by $4.3 million due primarily to the emergence of more favorable loss patterns than expected. Other lines loss and LAE reserves developed adversely by $2.0 million due primarily to the emergence of more adverse loss patterns than expected for prior accident years. For the nine months ended September 30, 2020, the Company increased its property and casualty insurance reserves by $28.3 million to recognize adverse development of loss and LAE reserves from prior accident years. Specialty personal automobile insurance loss and LAE reserves developed adversely by $31.3 million due primarily to the emergence of more adverse loss patterns than expected. Commercial automobile loss and LAE reserves developed favorably by $14.4 million due primarily to the emergence of more favorable loss patterns than expected for commercial automobile liability insurance. Preferred personal automobile insurance loss and LAE reserves developed adversely by $17.2 million due primarily to the emergence of more adverse loss patterns than expected. Homeowners loss and LAE reserves developed favorably by $3.0 million due primarily to the emergence of more favorable loss patterns than expected. Other lines loss and LAE reserves developed favorably by $2.8 million due primarily to the emergence of more favorable loss patterns than expected for prior accident years. Note 5 - Property and Casualty Insurance Reserves (continued) The Company cannot predict whether loss and LAE reserves will develop favorably or adversely from the amounts reported in the Company’s Condensed Consolidated Financial Statements. The Company believes that any such development will not have a material effect on the Company’s Condensed Consolidated Shareholders’ Equity, but could have a material effect on the Company’s consolidated financial results for a given period. Receivables from Policyholders - Allowance for Expected Credit Losses The following table presents receivables from policyholders, net of the allowance for expected credit losses including a rollforward of changes in the allowance for expected credit losses for the nine months ended September 30, 2021. (Dollars in Millions) Receivables from Policyholders, Net of Allowance for Expected Credit Losses Allowance for Expected Credit Losses Balance at Beginning of Year $ 1,194.5 $ 20.9 Provision for Expected Credit Losses 36.7 Write-offs of Uncollectible Receivables from Policyholders (44.9) Balance at End of Period $ 1,481.2 $ 12.7 The following table presents receivables from policyholders, net of the allowance for expected credit losses including a rollforward of changes in the allowance for expected credit losses for the nine months ended September 30, 2020. (Dollars in Millions) Receivables from Policyholders, Net of Allowance for Expected Credit Losses Allowance for Expected Credit Losses Balance at Beginning of Year $ 1,117.1 $ 22.3 Provision for Expected Credit Losses 31.9 Write-offs of Uncollectible Receivables from Policyholders (33.8) Balance at End of Period $ 1,249.3 $ 20.4

Investments

Investments	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Fixed Maturities The amortized cost, gross unrealized gains and losses, allowance for expected credit loss, and estimated fair values of the Company’s Investments in Fixed Maturities at September 30, 2021 were: Amortized Gross Unrealized Allowance for Expected Credit Losses Fair Value (Dollars in Millions) Gains Losses U.S. Government and Government Agencies and Authorities $ 472.0 $ 31.4 $ (0.8) $ — $ 502.6 States and Political Subdivisions 1,780.3 148.8 (11.8) — 1,917.3 Foreign Governments 6.7 0.1 (1.1) — 5.7 Corporate Securities: Bonds and Notes 3,948.8 504.7 (15.8) (4.4) 4,433.3 Redeemable Preferred Stocks 7.0 0.4 — — 7.4 Collateralized Loan Obligations 738.6 2.0 (4.7) — 735.9 Other Mortgage- and Asset-backed 269.1 14.5 (0.7) — 282.9 Investments in Fixed Maturities $ 7,222.5 $ 701.9 $ (34.9) $ (4.4) $ 7,885.1 Note 6 - Investments (continued) The amortized cost, gross unrealized gains and losses, allowance for expected credit loss, and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2020 were: Amortized Gross Unrealized Allowance for Expected Credit Losses Fair Value (Dollars in Millions) Gains Losses U.S. Government and Government Agencies and Authorities $ 536.5 $ 48.9 $ (0.1) $ — $ 585.3 States and Political Subdivisions 1,404.3 185.4 (0.2) — 1,589.5 Foreign Governments 6.6 — (1.1) (0.3) 5.2 Corporate Securities: Bonds and Notes 3,749.5 689.5 (10.6) (3.0) 4,425.4 Redeemable Preferred Stocks 7.0 0.5 — — 7.5 Collateralized Loan Obligations 785.1 2.3 (19.7) — 767.7 Other Mortgage- and Asset-backed 203.7 21.6 — — 225.3 Investments in Fixed Maturities $ 6,692.7 $ 948.2 $ (31.7) $ (3.3) $ 7,605.9 Other Receivables included $6.8 million and $5.1 million of unsettled sales of Investments in Fixed Maturities at September 30, 2021 and December 31, 2020, respectively. Accrued Expenses and Other Liabilities included unsettled purchases of Investments in Fixed Maturities of $38.7 million and $4.3 million at September 30, 2021 and December 31, 2020, respectively. The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at September 30, 2021 by contractual maturity were: (Dollars in Millions) Amortized Cost Fair Value Due in One Year or Less $ 67.5 $ 69.4 Due after One Year to Five Years 1,004.2 1,065.5 Due after Five Years to Ten Years 1,581.3 1,700.6 Due after Ten Years 3,228.2 3,682.2 Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,341.3 1,367.4 Investments in Fixed Maturities $ 7,222.5 $ 7,885.1 The expected maturities of the Company’s Investments in Fixed Maturities may differ from the contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Investments in Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date at September 30, 2021 consisted of securities issued by the Government National Mortgage Association with a fair value of $293.8 million, securities issued by the Federal National Mortgage Association with a fair value of $28.8 million, securities issued by the Federal Home Loan Mortgage Corporation with a fair value of $26.0 million, and securities issued by other non-governmental issuers with a fair value of $1,018.8 million. Note 6 - Investments (continued) An aging of unrealized losses on the Company’s Investments in Fixed Maturities at September 30, 2021 is presented below. Less Than 12 Months 12 Months or Longer Total (Dollars in Millions) Fair Unrealized Fair Unrealized Fair Unrealized Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 45.0 $ (0.7) $ 1.2 $ (0.1) $ 46.2 $ (0.8) States and Political Subdivisions 468.1 (11.8) 0.2 — 468.3 (11.8) Foreign Governments 0.5 (0.5) 2.7 (0.6) 3.2 (1.1) Corporate Securities: Bonds and Notes 495.1 (14.0) 26.5 (1.8) 521.6 (15.8) Collateralized Loan Obligations 206.1 (2.4) 234.9 (2.3) 441.0 (4.7) Other Mortgage- and Asset-backed 63.2 (0.7) — — 63.2 (0.7) Total Fixed Maturities $ 1,278.0 $ (30.1) $ 265.5 $ (4.8) $ 1,543.5 $ (34.9) Investment-grade fixed maturity investments comprised $27.2 million and below-investment-grade fixed maturity investments comprised $7.7 million of the unrealized losses on investments in fixed maturities at September 30, 2021. For below-investment-grade fixed maturity investments in an unrealized loss position, the unrealized loss amount, on average, was approximately 5% of the amortized cost basis of the investment. An aging of unrealized losses on the Company’s Investments in Fixed Maturities at December 31, 2020 is presented below. Less Than 12 Months 12 Months or Longer Total (Dollars in Millions) Fair Unrealized Fair Unrealized Fair Unrealized Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 10.5 $ (0.1) $ — $ — $ 10.5 $ (0.1) States and Political Subdivisions 23.3 (0.2) — — 23.3 (0.2) Foreign Governments 0.5 (0.1) 2.6 (1.0) 3.1 (1.1) Corporate Securities: Bonds and Notes 132.9 (7.5) 46.1 (3.1) 179.0 (10.6) Collateralized Loan Obligations 145.2 (3.8) 371.4 (15.9) 516.6 (19.7) Other Mortgage- and Asset-backed 6.3 — — — 6.3 — Total Fixed Maturities $ 318.7 $ (11.7) $ 420.1 $ (20.0) $ 738.8 $ (31.7) Investment-grade fixed maturity investments comprised $8.0 million and below-investment-grade fixed maturity investments comprised $23.7 million of the unrealized losses on investments in fixed maturities at December 31, 2020. For below-investment-grade fixed maturity investments in an unrealized loss position, the unrealized loss amount, on average, was approximately 11% of the amortized cost basis of the investment. Note 6 - Investments (continued) At September 30, 2021 and December 31, 2020, the Company did not have the intent to sell these investments, and it was not more likely than not that the Company would be required to sell these investments before an anticipated recovery of value. The Company evaluated these investments for credit losses at September 30, 2021 and December 31, 2020. The Company considers many factors in evaluating whether the unrealized losses were credit related including, but not limited to, the extent to which the fair value has been less than amortized cost, conditions related to the security, industry, or geographic area, payment structure of the investment and the likelihood of the issuer’s ability to make contractual cashflows, defaults or other collectability concerns related to the issuer, changes in the ratings assigned by a rating agency, and other credit enhancements that affect the investment’s expected performance. The Company determined that the unrealized losses on these securities were due to non-credit related factors at the evaluation date. Fixed Maturities - Expected Credit Losses The following table sets forth the change in allowance for expected credit losses on fixed maturities available-for-sale by major security type for nine months ended September 30, 2021. Foreign Governments Corporate Bonds and Notes Total (Dollars in Millions) Beginning of the Year $ 0.3 $ 3.0 $ 3.3 Additions for Securities for which No Previous Expected Credit Losses were — 2.2 2.2 Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized (0.3) (0.6) (0.9) Write-offs Charged Against Allowance — (0.2) (0.2) End of the Period $ — $ 4.4 $ 4.4 The following table sets forth the change in allowance for expected credit losses on fixed maturities available-for-sale by major security type for the nine months ended September 30, 2020. Foreign Governments Corporate Bonds and Notes Total (Dollars in Millions) Beginning of the Year $ — $ — $ — Impact of Adopting ASU 2016-13 — — — Additions for Securities for which No Previous Expected Credit Losses were 0.6 5.0 5.6 Reduction Due to Sales (0.1) (0.4) (0.5) Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized 0.1 (0.1) — Write-offs Charged Against Allowance — (0.3) (0.3) End of the Period $ 0.6 $ 4.2 $ 4.8 Equity Securities Investments in Equity Securities at Fair Value were $969.6 million and $858.5 million at September 30, 2021 and December 31, 2020, respectively. Net unrealized gains arising during the nine months ended September 30, 2021 and recognized in earnings, related to such investments still held as of September 30, 2021, were $107.3 million. Investments in Equity Securities at Modified Cost were $33.0 million and $40.1 million at September 30, 2021 and December 31, 2020, respectively. The Company performs a qualitative impairment analysis on a quarterly basis consisting of various factors such as earnings performance, current market conditions, changes in credit ratings, changes in the regulatory environment and other factors. If the qualitative analysis identifies the presence of impairment indicators, the Company estimates the fair value of the investment. If the estimated fair value is below the carrying value, the Company records an Note 6 - Investments (continued) impairment in the Condensed Consolidated Statement of Income to reduce the carrying value to the estimated fair value. When the Company identifies observable transactions of the same or similar securities to those held by the Company, the Company increases or decreases the carrying value to the observable transaction price. The Company did not recognize any increases in the carrying value due to observable transactions for the nine months ended September 30, 2021. The Company recognized an impairment of $0.7 million and $4.1 million on Equity Securities at Modified Cost for three and nine months ended September 30, 2021, respectively as a result of the Company’s impairment analysis. The Company has recognized $0.5 million of cumulative decreases in the carrying value due to observable transactions, no cumulative increases in the carrying value due to observable transactions and $9.9 million of cumulative impairments on Equity Securities at Modified Cost held as of September 30, 2021. There were $0.2 million and no unsettled purchases of Investments in Equity Securities at September 30, 2021 and December 31, 2020, respectively. There were no unsettled sales of Investments in Equity Securities at September 30, 2021 and December 31, 2020, respectively. Equity Method Limited Liability Investments Equity Method Limited Liability Investments include investments in limited liability investment companies and limited partnerships in which the Company’s interests are not deemed minor and are accounted for under the equity method of accounting. The Company’s investments in Equity Method Limited Liability Investments are generally of a passive nature in that the Company does not take an active role in the management of the investment entity. The Company’s maximum exposure to loss at September 30, 2021 is limited to the total carrying value of $255.1 million. In addition, the Company had outstanding commitments totaling approximately $83.7 million to fund Equity Method Limited Liability Investments at September 30, 2021. At September 30, 2021, 7.0% of Equity Method Limited Liability Investments were reported without a reporting lag. Of the total carrying value, 17.5% was reported with a one month lag and the remainder was reported with more than a one month lag. Alternative Energy Partnership Investments Alternative Energy Partnership Investments include partnerships formed to invest in newly installed residential solar leases and power purchase agreements. As a result of this investment, the Company has the right to certain investment tax credits and tax depreciation benefits, and to a lesser extent, cash flows generated from the installed solar systems leased to individual consumers for a fixed period of time. The Hypothetical Liquidation at Book Value (“HLBV”) equity method of accounting is used for the Company’s investments in Alternative Energy Partnership Investments. The Company’s maximum exposure to loss at September 30, 2021 is limited to the total carrying value of $54.2 million. The Company has no outstanding commitments to fund Alternative Energy Partnership Investments as of September 30, 2021. Alternative Energy Partnership Investments are reported on a three month lag. Other Investments The carrying values of the Company’s Other Investments at September 30, 2021 and December 31, 2020 were: (Dollars in Millions) Sep 30, Dec 31, Company-Owned Life Insurance $ 440.7 $ 327.4 Loans to Policyholders at Unpaid Principal 289.6 297.9 Real Estate at Depreciated Cost 95.8 98.7 Mortgage Loans and Other 95.4 55.0 Total $ 921.5 $ 779.0 Note 6 - Investments (continued) Net Investment Income Net Investment Income for the nine and three months ended September 30, 2021 and 2020 was: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Investment Income: Interest on Fixed Income Securities $ 207.1 $ 218.0 $ 68.4 $ 72.7 Dividends on Equity Securities Excluding Alternative Investments 9.8 10.7 2.9 2.8 Alternative Investments: Equity Method Limited Liability Investments 50.9 (2.7) 12.0 8.2 Limited Liability Investments Included in Equity Securities 29.3 7.3 9.5 2.4 Total Alternative Investments 80.2 4.6 21.5 10.6 Short-term Investments 0.6 4.2 0.2 2.3 Loans to Policyholders 16.3 16.6 5.4 5.5 Real Estate 7.1 7.1 2.3 2.3 Other 23.1 9.3 9.1 2.7 Total Investment Income 344.2 270.5 109.8 98.9 Investment Expenses: Real Estate 6.8 6.5 2.6 1.2 Other Investment Expenses 18.5 18.5 5.3 5.6 Total Investment Expenses 25.3 25.0 7.9 6.8 Net Investment Income $ 318.9 $ 245.5 $ 101.9 $ 92.1 Gross gains and losses on sales of investments in fixed maturities for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Fixed Maturities: Gains on Sales $ 42.7 $ 38.7 $ 10.3 $ 11.9 Losses on Sales (1.7) (3.5) (0.4) (1.9)

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company classifies its investments in Fixed Maturities as available-for-sale and reports these investments at fair value. The Company reports equity investments with readily determinable fair values as Equity Securities at Fair Value. Certain investments that are measured at fair value using the net asset value practical expedient are not required to be classified using the fair value hierarchy, but are presented in the following two tables to permit reconciliation of the fair value hierarchy to the amounts presented in the Condensed Consolidated Balance Sheets. The valuation of assets measured at fair value in Company’s Condensed Consolidated Balance Sheets at September 30, 2021 is summarized below. Fair Value Measurements (Dollars in Millions) Quoted Prices Significant Other Significant Measured at Net Asset Value Total Fair Value Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 135.1 $ 367.5 $ — $ — $ 502.6 States and Political Subdivisions — 1,917.3 — — 1,917.3 Foreign Governments — 5.7 — — 5.7 Corporate Securities: Bonds and Notes — 4,219.7 213.6 — 4,433.3 Redeemable Preferred Stock — 1.3 6.1 — 7.4 Collateralized Loan Obligations — 735.9 — — 735.9 Other Mortgage and Asset-backed — 268.6 14.3 — 282.9 Total Investments in Fixed Maturities 135.1 7,516.0 234.0 — 7,885.1 Equity Securities at Fair Value: Preferred Stocks: Finance, Insurance and Real Estate — 34.6 — — 34.6 Other Industries — 16.0 1.1 — 17.1 Common Stocks: Finance, Insurance and Real Estate 39.0 — — — 39.0 Other Industries 3.1 — — 3.1 Other Equity Interests: Exchange Traded Funds 546.9 — — — 546.9 Limited Liability Companies and Limited Partnerships — — — 328.9 328.9 Total Investments in Equity Securities at Fair Value 589.0 50.6 1.1 328.9 969.6 Convertible Securities at Fair Value — 44.1 — — 44.1 Total $ 724.1 $ 7,610.7 $ 235.1 $ 328.9 $ 8,898.8 At September 30, 2021, the Company had unfunded commitments to invest an additional $111.0 million in certain limited liability investment companies and limited partnerships that will be included in Other Equity Interests if funded. Note 7 - Fair Value Measurements (continued) The valuation of assets measured at fair value in the Company’s Consolidated Balance Sheets at December 31, 2020 is summarized below. Fair Value Measurements (Dollars in Millions) Quoted Prices Significant Other Significant Measured at Net Asset Value Total Fair Value Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 134.0 $ 451.3 $ — $ — $ 585.3 States and Political Subdivisions — 1,589.5 — — 1,589.5 Foreign Governments — 5.2 — — 5.2 Corporate Securities: Bonds and Notes — 3,992.4 433.0 — 4,425.4 Redeemable Preferred Stocks — 1.3 6.2 — 7.5 Collateralized Loan Obligations — 767.7 — — 767.7 Other Mortgage and Asset-backed — 215.3 10.0 — 225.3 Total Investments in Fixed Maturities 134.0 7,022.7 449.2 — 7,605.9 Equity Securities at Fair Value: Preferred Stocks: Finance, Insurance and Real Estate — 43.7 — — 43.7 Other Industries — 15.4 — — 15.4 Common Stocks: Finance, Insurance and Real Estate 8.7 1.7 — — 10.4 Other Industries 0.4 — — — 0.4 Other Equity Interests: Exchange Traded Funds 496.4 — — — 496.4 Limited Liability Companies and Limited Partnerships — — — 292.2 292.2 Total Investments in Equity Securities at Fair Value 505.5 60.8 — 292.2 858.5 Other Investments: Convertible Securities at Fair Value — 39.9 — — 39.9 Total $ 639.5 $ 7,123.4 $ 449.2 $ 292.2 $ 8,504.3 The Company’s investments in Fixed Maturities that are classified as Level 1 primarily consist of U.S. Treasury Bonds and Notes. The Company’s investments in Equity Securities at Fair Value that are classified as Level 1 consist of either investments in publicly-traded common stocks or exchange traded funds. The Company’s investments in Fixed Maturities that are classified as Level 2 primarily consist of investments in corporate bonds, obligations of states and political subdivisions, collateralized loan obligations, and mortgage-backed securities of U.S. government agencies. The Company’s investments in Equity Securities at Fair Value that are classified as Level 2 primarily consist of investments in preferred stocks. The Company uses a leading, nationally recognized provider of market data and analytics to price the vast majority of the Company’s Level 2 measurements. The provider utilizes evaluated pricing models that vary by asset class and incorporate available trade, bid and other market information. Because many fixed maturity securities do not trade on a daily basis, the provider’s evaluated pricing Note 7 - Fair Value Measurements (continued) applications apply available information through processes such as benchmark curves, benchmarking of like securities, sector groupings and matrix pricing to prepare evaluations. In addition, the provider uses model processes to develop prepayment and interest rate scenarios. The pricing provider’s models and processes also take into account market convention. For each asset class, teams of its evaluators gather information from market sources and integrate relevant credit information, perceived market movements and sector news into the evaluated pricing applications and models. The Company generally validates the measurements obtained from its primary pricing provider by comparing them with measurements obtained from one additional pricing provider that provides either prices from recent market transactions, quotes in inactive markets or evaluations based on its own proprietary models. The Company investigates significant differences related to the values provided. On completion of its investigation, management exercises judgment to determine the price selected and whether adjustments, if any, to the price obtained from the Company’s primary pricing provider would warrant classification of the price as Level 3. In instances where a measurement cannot be obtained from either pricing provider, the Company generally will evaluate bid prices from one or more binding quotes obtained from market makers to value investments in inactive markets and classified by the Company as Level 2. The Company generally classifies securities when it receives non-binding quotes or indications as Level 3 securities unless the Company can validate the quote or indication against recent transactions in the market. The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments classified as Level 3 at September 30, 2021. (Dollars in Millions) Unobservable Input Total Fair Value Range of Unobservable Inputs Weighted-average Yield Investment-grade Market Yield $ 89.7 1.9 % 10.0 % 5.3 % Non-investment-grade: Senior Debt Market Yield 40.9 5.1 18.5 9.2 Junior Debt Market Yield 68.0 5.9 29.0 14.7 Other Various 35.4 Total Level 3 Fixed Maturity Investments $ 234.0 The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments classified as Level 3 at December 31, 2020. (Dollars in Millions) Unobservable Input Total Fair Value Range of Unobservable Inputs Weighted-average Yield Investment-grade Market Yield $ 246.7 1.4 % 13.0 % 3.8 % Non-investment-grade: Senior Debt Market Yield 111.1 2.4 23.4 9.5 Junior Debt Market Yield 64.6 3.1 27.9 13.7 Other Various 26.8 Total Level 3 Fixed Maturity Investments $ 449.2 Note 7 - Fair Value Measurements (continued) For an investment in a fixed maturity security, an increase in the yield used to determine the fair value of the security will decrease the fair value of the security. A decrease in the yield used to determine fair value will increase the fair value of the security, but for callable securities the fair value increase is generally limited to par, unless security is currently callable at a premium. Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the nine months ended September 30, 2021 is presented below. Fixed Maturities Equity Securities (Dollars in Millions) Corporate Redeemable Collateralized Loan Obligations Other Mortgage- Preferred Total Balance at Beginning of Year $ 433.0 $ 6.2 $ — $ 10.0 $ — $ 449.2 Total Gains (Losses): Included in Condensed Consolidated Statement of Income 0.9 — — — 0.3 1.2 Included in Other Comprehensive Income (Loss) 5.5 (0.1) 0.1 (0.5) — 5.0 Purchases 46.9 — 17.7 16.2 1.7 82.5 Settlements — — — (0.1) — (0.1) Sales (94.4) — (10.0) (0.2) — (104.6) Transfers into Level 3 2.5 — 10.0 — 1.7 14.2 Transfers out of Level 3 (180.8) — (17.8) (11.1) (2.6) (212.3) Balance at End of Period $ 213.6 $ 6.1 $ — $ 14.3 $ 1.1 $ 235.1 The transfers into and out of Level 3 were due primarily to changes in the availability of market observable inputs. Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the three months ended September 30, 2021 is presented below. Fixed Maturities Equity Securities (Dollars in Millions) Corporate Redeemable Collateralized Loan Obligations Other Mortgage- Preferred Total Balance at Beginning of Period $ 409.2 $ 6.2 $ 27.8 $ 18.2 $ 3.4 $ 464.8 Total Gains (Losses): Included in Condensed Consolidated Statement of Income 0.9 — — — 0.3 1.2 Included in Other Comprehensive Income (Loss) 4.7 (0.1) — — — 4.6 Purchases 7.4 — — 7.2 — 14.6 Settlements — — — — — — Sales (28.4) — (10.0) — — (38.4) Transfers into Level 3 — — — — — — Transfers out of Level 3 (180.2) — (17.8) (11.1) (2.6) (211.7) Balance at End of Period $ 213.6 $ 6.1 $ — $ 14.3 $ 1.1 $ 235.1 The transfers into and out of Level 3 were due primarily to changes in the availability of market observable inputs. Note 7 - Fair Value Measurements (continued) Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the nine months ended September 30, 2020 is presented below. Fixed Maturities (Dollars in Millions) Corporate States and Political Sub- divisions Redeemable Collateralized Loan Obligations Other Mortgage- Total Balance at Beginning of Year $ 409.1 $ — $ 6.7 $ 618.2 $ 10.2 $ 1,044.2 Total Gains (Losses): Included in Condensed Consolidated Statement of Income (6.3) — — (0.3) — (6.6) Included in Other Comprehensive Income (Loss) (1.0) 0.1 0.6 (9.4) 0.3 (9.4) Purchases 150.1 0.6 — 53.5 — 204.2 Settlements — — — — (0.1) (0.1) Sales (77.5) — (0.1) (26.4) (0.2) (104.2) Transfers into Level 3 7.4 — — — — 7.4 Transfers out of Level 3 — (0.7) (1.2) (635.6) — (637.5) Balance at End of Period $ 481.8 $ — $ 6.0 $ — $ 10.2 $ 498.0 The transfers into and out of Level 3 were due to changes in the availability of market observable inputs. Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the three months ended September 30, 2020 is presented below. Fixed Maturities (Dollars in Millions) Corporate States and Political Sub- divisions Redeemable Collateralized Loan Obligations Other Mortgage- Total Balance at Beginning of Period $ 452.3 $ — $ 5.4 $ — $ 10.3 $ 468.0 Total Gains (Losses): Included in Condensed Consolidated Statement of Income (1.3) — — — — (1.3) Included in Other Comprehensive Income (Loss) 5.1 — 0.7 — (0.1) 5.7 Purchases 69.5 — — — — 69.5 Settlements — — — — — — Sales (43.8) — (0.1) — — (43.9) Transfers into Level 3 — — — — — — Transfers out of Level 3 — — — — — — Balance at End of Period $ 481.8 $ — $ 6.0 $ — $ 10.2 $ 498.0 Note 7 - Fair Value Measurements (continued) Presented below are the carrying values and fair value estimates of financial instruments not carried at fair value. September 30, 2021 December 31, 2020 (Dollars in Millions) Carrying Value Fair Value Carrying Value Fair Value Financial Assets: Loans to Policyholders $ 289.6 $ 289.6 $ 297.9 $ 297.9 Short-term Investments 259.7 259.7 875.4 875.4 Mortgage Loans 94.0 94.0 54.6 54.6 Company-Owned Life Insurance 440.7 440.7 $ 327.4 $ 327.4 Equity Securities at Modified Cost 33.0 37.7 40.1 40.1 Financial Liabilities: Long-term Debt $ 1,122.1 $ 1,166.1 $ 1,172.8 $ 1,247.8 Policyholder Obligations 378.9 378.9 407.8 407.8 The fair value measurement for loans to policyholders are categorized as Level 3 within the fair value hierarchy. The fair value measurement of Short-term Investments is estimated using inputs that are considered either Level 1 or Level 2 measurements. The Mortgage Loans fair value measurement is considered equal to amortized cost given the short term nature of the investments. The fair value measurement of Equity Securities at Modified Cost is estimated using inputs that are considered Level 3 measurements. The fair value of Company-Owned Life Insurance is cash surrender value. The fair value of Long-term Debt is estimated using quoted prices for similar liabilities in markets that are not active. The inputs used in the valuation are considered Level 2 measurements. Policyholder Obligations presented in the preceding table consist of advances from the FHLB of Chicago, and the inputs used in the valuation are considered Level 2 measurements.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Variable Interest Entity Disclosure	Variable Interest Entities The Company invests in an Alternative Energy Partnership formed to provide sustainable energy projects that are designed to generate a return primarily through the realization of federal tax credits. This entity was formed to invest in newly installed residential solar leases and power purchase agreements. As a result of this investment, the Company has the right to certain investment tax credits and tax depreciation benefits, and to a lesser extent, cash flows generated from the installed solar systems leased to individual consumers. The Company’s interest in the Alternative Energy Partnership Investment is considered an investment in a variable interest entity (“VIE”). To determine whether the investment should be consolidated in the Condensed Consolidated Financial Statements, the Company evaluates whether it is the primary beneficiary of the VIE. The primary beneficiary is the party that has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company has determined that it is not the primary beneficiary as it does not have the power to direct the activities that most significantly impact the economic performance of the entity and therefore is not required to consolidate the VIE. The project sponsor governs the entity and the Company only has consent rights that have been deemed protective in nature and does not participate in key economic decisions of the entity. The investment is accounted for using the equity method of accounting and included in Alternative Energy Partnership Investments in the Condensed Consolidated Balance Sheets. The Company uses the HLBV equity method to account for earnings and losses. This method provides an earnings allocation that appropriately reflects the substantive economics of the investment. Earnings and losses on the investment are reported in Change in Value of Alternative Energy Partnership Investments and investment tax credits are recognized in Income Tax Expense (Benefit) on the Condensed Consolidated Statements of Income. Note 8 - Variable Interest Entities (continued) The following table presents information regarding activity in the Company’s Alternative Energy Partnership Investments as of the periods indicated: Nine Months Ended Three Months Ended (Dollars in millions) Sep 30, 2021 Sep 30, 2020 Sep 30, 2021 Sep 30, 2020 Fundings $ 80.0 $ — $ 31.5 $ — Cash distribution from investment 0.2 — 0.2 — Gain (loss) on investments in Alternative Energy Partnership (46.9) — (23.8) — Income tax credits recognized 64.8 — 28.7 — Tax benefit (expense) recognized from Alternative Energy Partnership 3.0 — 1.9 — The following table represents the carrying value of the associated assets and liabilities and the associated maximum loss exposure of the Alternative Energy Partnership Investments as of the dates indicated: (Dollars in millions) Sep 30, 2021 Cash $ 17.2 Equipment, net of depreciation 245.4 Other assets 3.4 Total unconsolidated assets 266.0 Maximum loss exposure 54.2 The Company’s maximum loss exposure in the event that all of the assets in the Alternative Energy Partnership are deemed worthless is $54.2 million, which is the carrying value of the investment at September 30, 2021.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income	Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income The tables below display the changes in Accumulated Other Comprehensive Income (Loss) by component for the nine months ended September 30, 2021 and 2020 (Dollars in Millions) Net Unrealized Gains (Losses) on Other Investments Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrecognized Postretirement Benefit Costs Gain (Loss) on Cash Flow Hedges Total Balance as of January 1, 2021 730.6 (2.1) (45.7) (2.3) 680.5 Other Comprehensive Income (Loss) Before Reclassifications (172.8) (1.5) — — (174.3) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $7.4, $—, $0.5, $(0.1) and $7.8 (27.8) — 0.7 0.3 (26.8) Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $53.4, $0.4, $0.5, $(0.1) and $54.2 (200.6) (1.5) 0.7 0.3 (201.1) Balance as of September 30, 2021 530.0 (3.6) (45.0) (2.0) 479.4 Note 9 - Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (continued) (Dollars in Millions) Net Unrealized Gains (Losses) on Other Investments Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrecognized Postretirement Benefit Costs Gain (Loss) on Cash Flow Hedges Total Balance as of January 1, 2020 439.4 — (100.6) (2.7) 336.1 Other Comprehensive Income (Loss) Before Reclassifications 225.8 (1.9) 1.8 0.2 225.9 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $3.4, $—, $—, $— and $3.4 (13.0) — — — (13.0) Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(56.5), $0.5, $(0.5), $(0.1) and $(56.6) 212.8 (1.9) 1.8 0.2 212.9 Balance as of September 30, 2020 652.2 (1.9) (98.8) (2.5) 549.0 The tables below display the changes in Accumulated Other Comprehensive Income (Loss) by component for the three months ended September 30, 2021 and 2020. (Dollars in Millions) Net Unrealized Gains (Losses) on Other Investments Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrecognized Postretirement Benefit Costs Gain (Loss) on Cash Flow Hedges Total Balance as of July 1, 2021 594.0 (4.0) (44.9) (2.1) 543.0 Other Comprehensive Income (Loss) Before Reclassifications (56.5) 0.4 — — (56.1) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $2.0, $—, $0.1, $(0.1) and $2.0 (7.5) — (0.1) 0.1 (7.5) Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $16.8, $(0.1), $0.1, $(0.1) and $16.7 (64.0) 0.4 (0.1) 0.1 (63.6) Balance as of September 30, 2021 530.0 (3.6) (45.0) (2.0) 479.4 Note 9 - Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (continued) (Dollars in Millions) Net Unrealized Gains (Losses) on Other Investments Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrecognized Postretirement Benefit Costs Gain (Loss) on Cash Flow Hedges Total Balance as of July 1, 2020 602.3 (2.9) (99.5) (2.6) 497.3 Other Comprehensive Income (Loss) Before Reclassifications 57.0 1.0 0.7 0.1 58.8 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $1.9, $—, $—, $— and $1.9 (7.1) — — — (7.1) Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(13.2), $(0.3), $(0.2), $(0.1) and $(13.8) 49.9 1.0 0.7 0.1 51.7 Balance as of September 30, 2020 652.2 (1.9) (98.8) (2.5) 549.0 Amounts reclassified from Accumulated Other Comprehensive Income (Loss) shown above are reported in Net Income (Loss) as follows: Components of AOCI Consolidated Statements of Income Line Item Affected by Reclassifications Net unrealized Gains (Losses) on Other Investments and Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Realized Gains on Sales of Investments and Impairment Losses Net Unrecognized Postretirement Benefit Costs Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses, Insurance Expenses, and Interest and Other Expenses Gain (Loss) on Cash Flow Hedges Interest and Other Expenses

Stockholders_ Equity

Stockholders’ Equity	9 Months Ended
	Sep. 30, 2021
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Shareholders’ Equity Common Stock Repurchases On May 6, 2020, Kemper’s Board of Directors authorized the repurchase of an additional $200.0 million of Kemper’s common stock, in addition to $133.3 million remaining under the August 6, 2014 authorization, bringing the remaining share repurchase authorization to approximately $333.3 million as of December 31, 2020. As of September 30, 2021, the remaining share repurchase authorization was $171.6 million under the repurchase program. During the nine months ended September 30, 2021 and 2020, Kemper repurchased and retired approximately 2,085,000 and 1,617,000 shares, respectively, of its common stock under its share repurchase authorization for an aggregate cost of $161.7 million and $110.4 million and an average cost per share of $77.58 and $68.29, respectively. During the three months ended September 30, 2021 Kemper repurchased and retired approximately 40,000 shares of its common stock under its share repurchase authorization for an aggregate cost of $3.0 million and an average cost per share of $74.79. Kemper did not repurchase any shares for the three months ended September 30, 2020. These purchases were made in the open market in accordance with applicable federal securities laws, including Rule 10b-18 and Rule 10b5-1 of the Securities Exchange Act of 1934. Note 10 - Shareholders’ Equity (continued) Employee Stock Purchase Plan During the nine months ended September 30, 2021 and 2020, the Company issued 54,000 and 44,000 shares under the Kemper Employee Stock Purchase Plan (“ESPP”), respectively, at an average discounted price of $61.74 and $60.17 per share. Compensation costs charged against income were $0.6 million and $0.5 million for the nine months ended September 30, 2021 and 2020, respectively. During the three months ended September 30, 2021 and 2020, the Company issued 22,000 and 18,000 shares under the ESPP, respectively, at a discounted price of $56.77 and $56.81 per share. Compensation costs charged against income were $0.2 million and $0.2 million for the three months ended September 30, 2021 and 2020, respectively.

Pension Benefits and Postretire

Pension Benefits and Postretirement Benefits Other Than Pensions	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Pension Benefits and Postretirement Benefits Other Than Pensions	Pension Benefits and Postretirement Benefits Other Than Pensions The Company sponsors a qualified defined benefit pension plan (the “Pension Plan”) that covers approximately 3,145 participants and beneficiaries. Effective January 1, 2006, the Pension Plan was closed to new hires and, effective June 30, 2016, benefit accruals were frozen for substantially all of the participants under the Pension Plan. The Pension Plan is generally non-contributory, but participation requires or required some employees to contribute 3% of pay, as defined, per year. Benefits for participants who are or were required to contribute to the Pension Plan are based on compensation during plan participation and the number of years of participation. Benefits for the vast majority of participants who are not required to contribute to the Pension Plan are based on years of service and final average pay, as defined. The Company funds the Pension Plan in accordance with the requirements of the Employee Retirement Income Security Act of 1974 (“ERISA”). The components of Pension (Benefit) Expense for the Pension Plan for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Interest Cost on Projected Benefit Obligation $ 5.3 $ 13.5 $ 1.8 $ 4.5 Expected Return on Plan Assets (7.0) (22.0) (2.3) (7.3) Amortization of Net Actuarial Loss 2.2 4.6 0.7 1.6 Total Pension (Benefit) Expense $ 0.5 $ (3.9) $ 0.2 $ (1.2) The Company sponsors two other than pension postretirement benefit (“OPEB”) plans (together the “OPEB Plans”) that together provide medical, dental and/or life insurance benefits to approximately 400 retired and 500 active employees. The components of OPEB benefits for the OPEB Plans for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Service Cost $ 0.2 $ 0.1 $ 0.1 $ — Interest Cost on Accumulated Postretirement Benefit Obligation 0.1 0.2 — — Amortization of Prior Service Credit (1.0) (0.9) (0.3) (0.2) Amortization of Net Gain (1.3) (1.4) (0.6) (0.4) Total OPEB (Benefit) Expense $ (2.0) $ (2.0) $ (0.8) $ (0.6) The non-service cost components of the Pension Plan and OPEB Plans are presented within the Interest and Other Expenses line item in the Condensed Consolidated Statements of Income.

Policyholder Contract Liabiliti

Policyholder Contract Liabilities	9 Months Ended
	Sep. 30, 2021
Insurance [Abstract]
Policyholder Contract Liabilities	Policyholder Obligations Policyholder Obligations at September 30, 2021 and December 31, 2020 were as follows: (Dollars in Millions) Sep 30, Dec 31, FHLB Funding Agreements $ 378.9 $ 407.8 Universal Life-type Policyholder Account Balances 102.9 59.2 Total $ 481.8 $ 467.0 Kemper’s subsidiary, United Insurance Company of America ("United Insurance") has entered into funding agreements with the Federal Home Loan Bank (“FHLB”) of Chicago in exchange for cash, which it uses for spread lending purposes. During the nine months ended September 30, 2021, United Insurance received advances of $296.9 million from the FHLB of Chicago and made repayments of $326.0 million under the spread lending program. When a funding agreement is issued, United Insurance is then required to post collateral in the form of eligible securities including mortgage-backed, government, and agency debt instruments for each of the advances that are entered. The fair value of the collateral pledged must be maintained at certain specified levels above the borrowed amount, which can vary depending on the assets pledged. If the fair value of the collateral declines below these specified levels of the amount borrowed, United Insurance would be required to pledge additional collateral or repay outstanding borrowings. Upon any event of default by United Insurance, the FHLB’s recovery on the collateral is limited to the amount of United Insurance’s liability under the funding agreements to the FHLB of Chicago. United Insurance’s liability under the funding agreements with the FHLB of Chicago, the amount of collateral pledged under such agreements and FHLB of Chicago common stock owned by United Insurance at September 30, 2021 and December 31, 2020 is presented below. (Dollars in Millions) Sep 30, Dec 31, Liability under Funding Agreements $ 378.9 $ 407.8 Fair Value of Collateral Pledged 547.8 530.5 FHLB of Chicago Common Stock Owned at Cost 11.8 11.8

Debt

Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt	Debt Amended and Extended Credit Agreement and Term Loan Facility On June 8, 2018, the Company entered into an amended and extended credit agreement and term loan facility. The amended and extended credit agreement increased the borrowing capacity of the existing unsecured credit agreement to $300.0 million and extended the maturity date to June 8, 2023. On June 4, 2019, the Company utilized the accordion feature under the credit agreement to increase its credit borrowing capacity by $100.0 million, resulting in the available credit commitments increasing from $300.0 million to $400.0 million. The Company incurred $0.1 million in additional debt issuance costs in connection with the utilization of the accordion feature, which, in addition to the $0.8 million of remaining unamortized costs under the credit agreement, is being amortized over the remaining term of the credit agreement. There were no outstanding borrowings under the credit agreement at either September 30, 2021 or December 31, 2020. Note 13 - Debt (continued) Long-term Debt The Company designates debt obligations as either short-term or long-term based on maturity date at issuance, or in the case of the 2022 Senior Notes, based on the date of assumption. Total amortized cost of Long-term Debt outstanding at September 30, 2021 and December 31, 2020 was: (Dollars in Millions) Sep 30, Dec 31, Term Loan due July 5, 2023 $ — $ 49.9 5.000% Senior Notes due September 19, 2022 277.1 278.3 4.350% Senior Notes due February 15, 2025 448.9 448.8 2.400% Senior Notes due September 30, 2030 396.1 395.8 Total Long-term Debt Outstanding $ 1,122.1 $ 1,172.8 Term Loan Due 2023 On June 4, 2019, the Company entered into a delayed-draw term loan facility with a borrowing capacity of $50.0 million and a maturity date four years from the borrowing date (the “2023 Term Loan”). On July 5, 2019, the Company borrowed $49.9 million, net of debt issuance costs, under the 2023 Term Loan, with a final maturity date of July 5, 2023 (and a mutual option to extend the maturity date by one year). On March 16, 2021, the Company repaid all $50.0 million outstanding borrowings and accrued interest on the 2023 Term Loan. 5.000% Senior Notes Due 2022 The liabilities of Infinity Property and Casualty Corporation (“Infinity”) at the date of Infinity’s acquisition included $275.0 million principal amount, 5.000% Senior Notes due September 19, 2022 (the “2022 Senior Notes”). The 2022 Senior Notes were recorded at fair value as of the acquisition date, $282.1 million, with the $7.1 million premium being amortized as a reduction to interest expense over the remaining term, resulting in an effective interest rate of 4.36%. On November 30, 2018, Kemper executed a guarantee to fully and unconditionally guarantee the payment and performance obligations of the 2022 Senior Notes. 4.350% Senior Notes Due 2025 Kemper has $450.0 million aggregate principal of 4.350% senior notes due February 15, 2025 (the “2025 Senior Notes”). Kemper initially issued $250.0 million of the notes in February of 2015 and issued an additional $200.0 million of the notes in June of 2017. The additional notes are fungible with the initial notes issued in 2015, and together are treated as part of a single series for all purposes under the indenture governing the 2025 Senior Notes. The 2025 Senior Notes are unsecured and may be redeemed in whole at any time or in part from time to time at Kemper’s option at specified redemption prices. 2.400% Senior Notes Due 2030 Kemper has $400.0 million aggregate principal of 2.400% senior notes due September 30, 2030 (the “2030 Senior Notes”). The net proceeds of issuance were $395.8 million, net of discount and transaction costs for an effective yield of 2.52%. The 2030 Senior Notes are unsecured and may be redeemed in whole at any time or in part from time to time, at Kemper’s option, at specified redemption prices. Short-term Debt Kemper’s subsidiaries, United Insurance, Trinity Universal Insurance Company (“Trinity”) and Alliance are members of the FHLBs of Chicago, Dallas and San Francisco, respectively. As a requirement of membership in the FHLBs, United Insurance, Trinity and Alliance maintain a certain level of investment in FHLB stock. The Company periodically uses short-term FHLB borrowings for a combination of cash management and risk management purposes, in addition to long-term FHLB borrowings for spread lending purposes. There were no short-term debt advances from the FHLBs of Chicago, Dallas or San Francisco outstanding at September 30, 2021 or December 31, 2020. For information on United Insurance’s funding agreement with the Note 13 - Debt (continued) FHLB of Chicago in connection with the spread lending program, see Note 12, “Policyholder Obligations,” to the Condensed Consolidated Financial Statements. Interest Expense and Interest Paid Interest Expense, including facility fees, accretion of discount, amortization of premium and amortization of issuance costs, was $33.0 million and $10.7 million for the nine and three months ended September 30, 2021. Interest paid, including facility fees, was $43.7 million and $21.6 million for the nine and three months ended September 30, 2021. Interest Expense, including facility fees, accretion of discount and amortization of issuance costs, was $24.7 million and $8.3 million for the nine and three months ended September 30, 2020. Interest paid, including facility fees, was $34.4 million and $16.9 million for the nine and three months ended September 30, 2020.

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	Leases The Company leases certain office space under non-cancelable operating leases, with initial terms typically ranging from one one The following table presents operating lease right-of-use assets and lease liabilities. (Dollars in Millions) Sep 30, Dec 31, Operating Lease Right-of-Use Assets $ 73.3 $ 68.6 Operating Lease Liabilities 97.9 89.6 Lease expenses are primarily included in Insurance Expenses in the Condensed Consolidated Statement of Income. Additional information regarding the Company’s lease cost is presented below. Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Lease Cost: Amortization of Right-of-Use Assets - Finance Leases $ 0.2 $ 0.2 $ 0.1 $ — Operating Lease Cost 16.8 15.9 5.8 5.1 Variable Lease Cost 0.1 — — — Short-Term Lease Cost (1) 2.4 — 0.8 — Total Lease Expense $ 19.5 $ 16.1 $ 6.7 5.1 Less: Sub-Lease Income 0.2 — 0.2 — Total Lease Cost $ 19.3 $ 16.1 $ 6.5 $ 5.1 (1) - Leases with an initial term of twelve months or less are not recorded on the Condensed Consolidated Balance Sheets. Note 14 - Leases (continued) Other Information on Operating Leases Supplemental cash flow information related to the Company’s operating and finance leases for the nine months ended September 30, 2021 and 2020 is as follows: Nine Months Ended (Dollars in Millions) Sep 30, Sep 30, Operating Cash Flows from Operating Lease (Fixed Payments) $ 17.5 $ 14.8 Operating Cash Flows from Operating Lease (Liability Reduction) 15.6 14.0 Financing Cash Flows from Finance Leases 0.2 0.2 Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities 19.4 8.2 Significant judgments and assumptions for determining lease asset and liability at September 30, 2021 and 2020 are presented below. Nine Months Ended Sep 30, Sep 30, Weighted-average Remaining Lease Term - Finance Leases 1.3 years 1.0 year Weighted-average Remaining Lease Term - Operating Leases 6.5 years 6.5 years Weighted-average Discount Rate - Finance Leases 0.6 % 4.0 % Weighted-average Discount Rate - Operating Leases 3.3 % 3.7 % Most of the Company’s leases do not provide an implicit rate. Accordingly, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of its lease payments. Future minimum lease payments under operating leases at September 30, 2021 are presented below. There are no significant future minimum lease payments under finance leases. (Dollars in Millions) Remainder of 2021 $ 6.3 2022 24.1 2023 21.2 2024 15.4 2025 10.3 2026 and Thereafter 34.4 Total Future Payments $ 111.7 Less Imputed Interest 13.8 Present Value of Minimum Lease Payments $ 97.9
Leases	Leases The Company leases certain office space under non-cancelable operating leases, with initial terms typically ranging from one one The following table presents operating lease right-of-use assets and lease liabilities. (Dollars in Millions) Sep 30, Dec 31, Operating Lease Right-of-Use Assets $ 73.3 $ 68.6 Operating Lease Liabilities 97.9 89.6 Lease expenses are primarily included in Insurance Expenses in the Condensed Consolidated Statement of Income. Additional information regarding the Company’s lease cost is presented below. Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Lease Cost: Amortization of Right-of-Use Assets - Finance Leases $ 0.2 $ 0.2 $ 0.1 $ — Operating Lease Cost 16.8 15.9 5.8 5.1 Variable Lease Cost 0.1 — — — Short-Term Lease Cost (1) 2.4 — 0.8 — Total Lease Expense $ 19.5 $ 16.1 $ 6.7 5.1 Less: Sub-Lease Income 0.2 — 0.2 — Total Lease Cost $ 19.3 $ 16.1 $ 6.5 $ 5.1 (1) - Leases with an initial term of twelve months or less are not recorded on the Condensed Consolidated Balance Sheets. Note 14 - Leases (continued) Other Information on Operating Leases Supplemental cash flow information related to the Company’s operating and finance leases for the nine months ended September 30, 2021 and 2020 is as follows: Nine Months Ended (Dollars in Millions) Sep 30, Sep 30, Operating Cash Flows from Operating Lease (Fixed Payments) $ 17.5 $ 14.8 Operating Cash Flows from Operating Lease (Liability Reduction) 15.6 14.0 Financing Cash Flows from Finance Leases 0.2 0.2 Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities 19.4 8.2 Significant judgments and assumptions for determining lease asset and liability at September 30, 2021 and 2020 are presented below. Nine Months Ended Sep 30, Sep 30, Weighted-average Remaining Lease Term - Finance Leases 1.3 years 1.0 year Weighted-average Remaining Lease Term - Operating Leases 6.5 years 6.5 years Weighted-average Discount Rate - Finance Leases 0.6 % 4.0 % Weighted-average Discount Rate - Operating Leases 3.3 % 3.7 % Most of the Company’s leases do not provide an implicit rate. Accordingly, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of its lease payments. Future minimum lease payments under operating leases at September 30, 2021 are presented below. There are no significant future minimum lease payments under finance leases. (Dollars in Millions) Remainder of 2021 $ 6.3 2022 24.1 2023 21.2 2024 15.4 2025 10.3 2026 and Thereafter 34.4 Total Future Payments $ 111.7 Less Imputed Interest 13.8 Present Value of Minimum Lease Payments $ 97.9

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The statute of limitations related to Kemper and its eligible subsidiaries’ consolidated Federal income tax returns is closed for all tax years up to and including 2011. As a result of the Company filing amended federal income tax returns, tax years 2012 and 2013 are under limited examination with respect to carryback adjustments associated with the amended returns. The statute of limitations related to tax years 2014, 2015, 2016 and 2017 has been extended to March 31, 2022. Tax years 2018 and 2019 are subject to a statute of three years from the extended due dates of October 15, 2019 and 2020, respectively. The expiration of the statute of limitations related to the various state income tax returns that Kemper and its subsidiaries file varies by state. Note 15 - Income Taxes (continued) There were no unrecognized tax benefits at September 30, 2021 or December 31, 2020. The Company recognizes interest and penalties, if any, related to unrecognized tax benefits in income tax expense.

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies In the ordinary course of its businesses, the Company is involved in legal proceedings, including lawsuits, arbitrations, regulatory examinations, audits and inquiries. Except with regard to the matters discussed below, based on currently available information, the Company does not believe that it is reasonably possible that any of its pending legal proceedings will have a material effect on the Company’s interim Condensed Consolidated Financial Statements. Over the last decade there have been multiple initiatives that intend, in various ways, to impose new duties on life insurance companies to proactively search for information related to the deaths of their insureds. These initiatives, which include legislation, audits, regulatory examinations and litigation, seek to alter the terms of life insurance contracts by imposing requirements that did not exist and were not contemplated at the time the issuing companies entered into such contracts. In 2016, the Company voluntarily began implementing a comprehensive process to compare the life insurance records of its life insurance subsidiaries against one or more death verification databases to determine if any of its insureds may be deceased; the process is continuing.

Related Parties

Related Parties	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Parties	Related PartiesChristopher B. Sarofim, a director of Kemper, is Vice Chairman and a member of the board of directors of Fayez Sarofim & Co. (“FS&C”), a registered investment advisory firm. FS&C provided investment management services to the Pension Plan. As part of the Pension Plan’s partial settlement of the pension obligations in 2020, the Pension Plan disposed of all assets managed by FS&C. Accordingly, the agreement between the Pension Plan and FS&C was terminated effective January 31, 2021.

Basis of Presentation and Acc_2

Basis of Presentation and Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Adoption of New Accounting Guidance and Guidance Not Yet Adopted	Adoption of New Accounting Guidance Guidance Adopted in 2021 In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes . ASU 2019-12 is intended to simplify accounting for income taxes by eliminating certain exceptions to the guidance in ASC Topic 740, Income Taxes , related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period, and the recognition of deferred tax liabilities for outside basis differences. ASU 2019-12 also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. Further, ASU 2019-12 clarifies that single-member limited liability companies and similar disregarded entities that are not subject to income tax are not required to recognize an allocation of consolidated income tax expense in their separate financial statements, but they could elect to do so. ASU 2019-12 is effective for annual periods beginning after December 15, 2020 and interim periods within those annual periods. The adoption of ASU 2019-12 did not have a material effect on the Company’s interim Condensed Consolidated Financial Statements. In January 2020, the FASB issued ASU 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815): Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the FASB Emerging Issues) , which clarifies the interaction of the accounting for equity securities under Topic 321 and investments accounted for under the equity method of accounting in Topic 323 and the accounting for certain forward contracts and purchased options accounted for under Topic 815. ASU 2020-01 is effective for annual periods beginning after December 15, 2020 and interim periods within those annual periods. The adoption of ASU 2020-01 did not have a material effect on the Company’s interim Condensed Consolidated Financial Statements. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting , which provides optional expedients and exceptions for applying generally accepted accounting principles to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The guidance in ASU 2020-04, if elected, shall apply to contract modifications if the terms that are modified directly replace, or have the potential to replace, a reference rate with another interest rate index. If other terms are Note 1 - Basis of Presentation and Accounting Policies (Continued) contemporaneously modified in a manner that changes, or has the potential to change, the amount or timing of contractual cash flows, the guidance in ASU 2020-04 shall apply only if those modifications are related to the replacement of a reference rate. ASU 2020-04 is effective for contract modifications made between March 12, 2020 through December 31, 2022. The adoption of ASU 2020-04 did not have a material effect on the Company’s interim Condensed Consolidated Financial Statements. The Company will continue to evaluate the impact of this guidance on its financial statements. In October 2020, the FASB issued ASU 2020-08, Codification Improvements to Subtopic 310-20, Receivables - Nonrefundable Fees and Other Costs , which clarifies that an entity should re-evaluate whether a callable debt security is within the scope of paragraph 310-20-35-33 for each reporting period. ASU 2020-08 is effective for annual periods beginning after December 15, 2020 and interim periods within those annual periods. The adoption of ASU 2020-08 did not have a material effect on the Company’s interim Condensed Consolidated Financial Statements. The Company has adopted all other recently issued accounting pronouncements with effective dates prior to January 1, 2021. There were no adoptions of such accounting pronouncements during the nine months ended September 30, 2021 that had a material impact on the Company’s interim Condensed Consolidated Financial Statements. Guidance Not Yet Adopted In August 2018, the FASB issued ASU 2018-12, Financial Services-Insurance (Topic 944): Targeted Improvements to Accounting for Long-Duration Contracts . ASU 2018-12 amends the accounting model for certain long-duration insurance contracts and requires the insurer to provide additional disclosures in annual and interim reporting periods. In November 2020, the FASB issued ASU 2020-11 which deferred the effective date of ASU 2018-12 by one year for public business entities. ASU 2018-12 is now effective for fiscal years beginning after December 15, 2022, and interim periods within those annual periods. The amendments in ASU 2018-12 (i) require cash flow assumptions used to measure the liability for future policy benefits for nonparticipating traditional and limited pay long duration contracts to be updated at least annually with the recognition and remeasurement recorded in net income, require the discount rate used in measuring the liability to be an upper-medium grade fixed-income instrument yield, which is to be updated at each reporting period, and recognized in other comprehensive income, (ii) simplify the amortization of deferred acquisition costs to be amortized on a constant level basis over the expected term of the contract, (iii) require all market risk benefits to be measured at fair value, and (iv) enhance certain presentation and disclosure requirements which include disaggregated rollforwards for liability for future policy benefits, policyholder account balances, market risk benefits, separate account liabilities, deferred acquisition costs, and information about significant inputs, judgments and methods used in the measurement. The Company plans to adopt using the modified retrospective transition method and is currently evaluating the impact of this guidance on its financial statements.

Net Income Per Unrestricted S_2

Net Income Per Unrestricted Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share	A reconciliation of the numerator and denominator used in the calculation of Basic Net Income (Loss) Per Unrestricted Share and Diluted Net Income (Loss) Per Unrestricted Share for the nine and three months ended September 30, 2021 and 2020 is presented below. Note 2 - Net Income Per Unrestricted Share (Continued) Nine Months Ended Three Months Ended (Dollars in Millions, except per share amounts) Sep 30, Sep 30, Sep 30, Sep 30, Net Income (Loss) $ (14.7) $ 312.4 $ (75.3) $ 122.3 Less: Net Income Attributed to Participating Awards — 0.3 — 0.1 Net Income (Loss) Attributed to Unrestricted Shares (14.7) 312.1 (75.3) 122.2 Dilutive Effect on Income of Equity-based Compensation Equivalent Shares — — — — Diluted Net Income (Loss) Attributed to Unrestricted Shares $ (14.7) $ 312.1 $ (75.3) $ 122.2 (Number of Shares in Thousands) Weighted-average Unrestricted Shares Outstanding 64,469.9 65,710.8 63,628.1 65,362.5 Equity-based Compensation Equivalent Shares — 1,086.6 — 1,271.0 Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 64,469.9 66,797.4 63,628.1 66,633.5 (Per Unrestricted Share in Whole Dollars) Basic Net Income (Loss) Per Unrestricted Share $ (0.23) $ 4.75 $ (1.18) $ 1.87 Diluted Net Income (Loss) Per Unrestricted Share $ (0.23) $ 4.67 $ (1.18) $ 1.83
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The number of shares of Kemper common stock that were excluded from the calculations of Equity-based Compensation Equivalent Shares and Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution for the nine and three months ended September 30, 2021 and 2020, because the effect of inclusion would be anti-dilutive, is presented below. Nine Months Ended Three Months Ended (Number of Shares in Thousands) Sep 30, Sep 30, Sep 30, Sep 30, Equity-based Compensation Equivalent Shares 2,205.4 873.3 2,170.2 876.1 Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 2,205.4 873.3 2,170.2 876.1

Acquisition of Business (Tables

Acquisition of Business (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	Based on the Company’s allocation of the purchase price, the fair value of the assets acquired and liabilities assumed were: (Dollars in Millions) Fixed Maturities at Fair Value $ 151.2 Equity Securities at Fair Value 82.4 Short-term Investments at Cost which Approximates Fair Value 100.1 Cash 54.3 Receivables from Policyholders 148.9 Other Receivables 2.0 Goodwill 198.0 Current Income Tax Assets 0.3 Other Assets 81.4 Property and Casualty Insurance Reserves (211.1) Unearned Premiums (177.8) Deferred Income Tax Liabilities (7.8) Accrued Expenses and Other Liabilities (51.0) Total Purchase Price $ 370.9
Schedule of Intangible Assets and Goodwill	Identifiable definite and indefinite lived intangible assets acquired consisted of the following: (Dollars in Millions) Definite Life Intangibles Value of Business Acquired $ 42.9 Customer Relationships 4.8 Agent Relationships 7.2 Internal-Use Software 6.5 Trade Names 1.8 Indefinite Life Intangible Assets Insurance Licenses 2.5
Business Acquisition, Pro Forma Information	The following unaudited pro forma information presents the Company’s results of operations as if the acquisition of AAC occurred on January 1, 2020. The adjustments to arrive at the pro forma information below included adjustments for the lost investment income on the cash used to fund the acquisition, amortization of the acquired intangible assets and the exclusion of certain acquisition related costs considered to be non-recurring in nature. Note 3 - Acquisition of Business (continued) Nine Months Ended Three Months Ended (Dollars in millions) Sep 30, Sep 30, Sep 30, Sep 30, Total Revenues $ 4,406.3 $ 4,094.0 $ 1,455.4 $ 1,449.9 Total Expenses 4,484.9 3,685.9 1,583.6 1,293.5 Income (Loss) from Continuing Operations before Income Taxes (78.6) 408.1 (128.2) 156.4 Net Income (Loss) $ 0.1 $ 331.6 $ (74.1) $ 127.4

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Revenue from External Customers by Products and Services	Earned Premiums by product line for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Specialty Property & Casualty Insurance: Specialty Automobile $ 2,615.6 $ 2,235.2 $ 920.6 $ 792.2 Commercial Automobile 300.6 217.7 107.7 79.2 Preferred Property & Casualty Insurance: Personal Automobile 309.1 324.6 102.6 110.6 Homeowners 154.6 167.4 52.5 55.0 Other Personal Lines 25.4 27.0 8.6 8.9 Life & Health Insurance: Life 300.2 289.2 101.5 96.3 Accident and Health 142.3 149.1 47.0 48.9 Property 46.8 48.0 15.6 15.4 Total Earned Premiums $ 3,894.6 $ 3,458.2 $ 1,356.1 $ 1,206.5
Reconciliation of Revenue from Segments to Consolidated	Segment Revenues, including a reconciliation to Total Revenues, for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Segment Revenues: Specialty Property & Casualty Insurance: Earned Premiums $ 2,916.2 $ 2,452.9 $ 1,028.3 $ 871.4 Net Investment Income 114.7 76.2 37.0 30.5 Change in Value of Alternative Energy Partnership Investments (22.3) — (11.3) — Other Income 3.1 1.4 1.2 0.4 Total Specialty Property & Casualty Insurance 3,011.7 2,530.5 1,055.2 902.3 Preferred Property & Casualty Insurance: Earned Premiums 489.1 519.0 163.7 174.5 Net Investment Income 51.5 24.3 16.1 10.3 Change in Value of Alternative Energy Partnership Investments (12.5) — (6.4) — Other Income — 0.1 — — Total Preferred Property & Casualty Insurance 528.1 543.4 173.4 184.8 Life & Health Insurance: Earned Premiums 489.3 486.3 164.1 160.6 Net Investment Income 151.9 146.0 48.4 50.7 Change in Value of Alternative Energy Partnership Investments (12.1) — (6.1) — Other Income 0.3 0.6 0.1 — Total Life & Health Insurance 629.4 632.9 206.5 211.3 Total Segment Revenues 4,169.2 3,706.8 1,435.1 1,298.4 Income (Loss) from Change in Fair Value of Equity and Convertible 92.4 (1.0) (0.6) 45.2 Net Realized Gains on Sales of Investments 43.1 38.2 10.1 10.0 Impairment Losses (7.8) (20.0) (0.6) (1.0) Other 18.2 89.6 11.4 1.1 Total Revenues $ 4,315.1 $ 3,813.6 $ 1,455.4 $ 1,353.7
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	Segment Operating Income (Loss), including a reconciliation to Income (Loss) before Income Taxes, for the nine and three months ended September 30, 2021 and 2020 was: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Segment Operating Income (Loss): Specialty Property & Casualty Insurance $ (128.7) $ 309.4 $ (91.8) $ 149.9 Preferred Property & Casualty Insurance (27.8) (18.0) (17.4) (41.8) Life & Health Insurance 6.5 61.6 (5.9) 15.2 Total Segment Operating Income (Loss) (150.0) 353.0 (115.1) 123.3 Corporate and Other Operating Income (Loss) From: Partial Satisfaction of Judgment — 89.4 — — Other (40.8) (26.8) (15.5) (11.0) Corporate and Other Operating Income (Loss) (40.8) 62.6 (15.5) (11.0) Adjusted Consolidated Operating Income (Loss) (190.8) 415.6 (130.6) 112.3 Income (Loss) from Change in Fair Value of Equity and Convertible Securities 92.4 (1.0) (0.6) 45.2 Net Realized Gains on Sales of Investments 43.1 38.2 10.1 10.0 Impairment Losses (7.8) (20.0) (0.6) (1.0) Acquisition Related Transaction, Integration and Other Costs (34.8) (43.3) (8.1) (14.4) Income (Loss) before Income Taxes $ (97.9) $ 389.5 $ (129.8) $ 152.1
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated	Segment Net Operating Income (Loss), including a reconciliation to Net Income (Loss), for the nine and three months ended September 30, 2021 and 2020 was: Nine Months Ended Three Months Ended (Dollars in Millions and Net of Income Taxes) Sep 30, Sep 30, Sep 30, Sep 30, Segment Net Operating Income (Loss): Specialty Property & Casualty Insurance $ (70.9) $ 246.8 $ (59.3) $ 119.2 Preferred Property & Casualty Insurance (5.1) (13.4) (6.4) (32.7) Life & Health Insurance 23.1 50.6 2.8 12.2 Total Segment Net Operating Income (Loss) (52.9) 284.0 (62.9) 98.7 Corporate and Other Net Operating Income (Loss) From: Partial Satisfaction of Judgment — 70.6 — — Other (35.1) (21.6) (12.9) (7.8) Total Corporate and Other Net Operating Income (Loss) (35.1) 49.0 (12.9) (7.8) Adjusted Consolidated Net Operating Income (Loss) (88.0) 333.0 (75.8) 90.9 Net Income (Loss) From: Change in Fair Value of Equity and Convertible Securities 73.0 (0.8) (0.5) 35.7 Net Realized Gains on Sales of Investments 34.0 30.2 7.9 7.9 Impairment Losses (6.2) (15.8) (0.5) (0.8) Acquisition Related Transaction, Integration and Other Costs (27.5) (34.2) (6.4) (11.4) Net Income (Loss) $ (14.7) $ 312.4 $ (75.3) $ 122.3

Property and Casualty Insuran_2

Property and Casualty Insurance Reserves (Tables)	9 Months Ended
	Sep. 30, 2021
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]
Liability for Unpaid Claims Adjustment Expense by Expense Type	Property and casualty insurance reserve activity for the nine months ended September 30, 2021 and 2020 was: Nine Months Ended (Dollars in Millions) Sep 30, Sep 30, Property and Casualty Insurance Reserves: Gross of Reinsurance at Beginning of Year $ 1,982.5 $ 1,969.8 Less Reinsurance Recoverables at Beginning of Year 50.1 65.6 Property and Casualty Insurance Reserves - Net of Reinsurance at Beginning of Year 1,932.4 1,904.2 Property and Casualty Insurance Reserves Acquired, Net of Reinsurance 211.1 — Incurred Losses and LAE Related to: Current Year 2,885.7 2,132.3 Prior Years 107.9 28.3 Total Incurred Losses and LAE 2,993.6 2,160.6 Paid Losses and LAE Related to: Current Year 1,503.9 1,133.7 Prior Years 1,080.4 1,032.9 Total Paid Losses and LAE 2,584.3 2,166.6 Property and Casualty Insurance Reserves - Net of Reinsurance at End of Period 2,552.8 1,898.2 Plus Reinsurance Recoverables at End of Period 43.4 51.8 Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period $ 2,596.2 $ 1,950.0
Premium Receivable, Allowance for Credit Loss	The following table presents receivables from policyholders, net of the allowance for expected credit losses including a rollforward of changes in the allowance for expected credit losses for the nine months ended September 30, 2021. (Dollars in Millions) Receivables from Policyholders, Net of Allowance for Expected Credit Losses Allowance for Expected Credit Losses Balance at Beginning of Year $ 1,194.5 $ 20.9 Provision for Expected Credit Losses 36.7 Write-offs of Uncollectible Receivables from Policyholders (44.9) Balance at End of Period $ 1,481.2 $ 12.7 The following table presents receivables from policyholders, net of the allowance for expected credit losses including a rollforward of changes in the allowance for expected credit losses for the nine months ended September 30, 2020. (Dollars in Millions) Receivables from Policyholders, Net of Allowance for Expected Credit Losses Allowance for Expected Credit Losses Balance at Beginning of Year $ 1,117.1 $ 22.3 Provision for Expected Credit Losses 31.9 Write-offs of Uncollectible Receivables from Policyholders (33.8) Balance at End of Period $ 1,249.3 $ 20.4

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at September 30, 2021 by contractual maturity were: (Dollars in Millions) Amortized Cost Fair Value Due in One Year or Less $ 67.5 $ 69.4 Due after One Year to Five Years 1,004.2 1,065.5 Due after Five Years to Ten Years 1,581.3 1,700.6 Due after Ten Years 3,228.2 3,682.2 Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,341.3 1,367.4 Investments in Fixed Maturities $ 7,222.5 $ 7,885.1
Schedule of Unrealized Loss on Investments	An aging of unrealized losses on the Company’s Investments in Fixed Maturities at September 30, 2021 is presented below. Less Than 12 Months 12 Months or Longer Total (Dollars in Millions) Fair Unrealized Fair Unrealized Fair Unrealized Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 45.0 $ (0.7) $ 1.2 $ (0.1) $ 46.2 $ (0.8) States and Political Subdivisions 468.1 (11.8) 0.2 — 468.3 (11.8) Foreign Governments 0.5 (0.5) 2.7 (0.6) 3.2 (1.1) Corporate Securities: Bonds and Notes 495.1 (14.0) 26.5 (1.8) 521.6 (15.8) Collateralized Loan Obligations 206.1 (2.4) 234.9 (2.3) 441.0 (4.7) Other Mortgage- and Asset-backed 63.2 (0.7) — — 63.2 (0.7) Total Fixed Maturities $ 1,278.0 $ (30.1) $ 265.5 $ (4.8) $ 1,543.5 $ (34.9) An aging of unrealized losses on the Company’s Investments in Fixed Maturities at December 31, 2020 is presented below. Less Than 12 Months 12 Months or Longer Total (Dollars in Millions) Fair Unrealized Fair Unrealized Fair Unrealized Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 10.5 $ (0.1) $ — $ — $ 10.5 $ (0.1) States and Political Subdivisions 23.3 (0.2) — — 23.3 (0.2) Foreign Governments 0.5 (0.1) 2.6 (1.0) 3.1 (1.1) Corporate Securities: Bonds and Notes 132.9 (7.5) 46.1 (3.1) 179.0 (10.6) Collateralized Loan Obligations 145.2 (3.8) 371.4 (15.9) 516.6 (19.7) Other Mortgage- and Asset-backed 6.3 — — — 6.3 — Total Fixed Maturities $ 318.7 $ (11.7) $ 420.1 $ (20.0) $ 738.8 $ (31.7)
Allowance for Credit Losses	The following table sets forth the change in allowance for expected credit losses on fixed maturities available-for-sale by major security type for nine months ended September 30, 2021. Foreign Governments Corporate Bonds and Notes Total (Dollars in Millions) Beginning of the Year $ 0.3 $ 3.0 $ 3.3 Additions for Securities for which No Previous Expected Credit Losses were — 2.2 2.2 Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized (0.3) (0.6) (0.9) Write-offs Charged Against Allowance — (0.2) (0.2) End of the Period $ — $ 4.4 $ 4.4 The following table sets forth the change in allowance for expected credit losses on fixed maturities available-for-sale by major security type for the nine months ended September 30, 2020. Foreign Governments Corporate Bonds and Notes Total (Dollars in Millions) Beginning of the Year $ — $ — $ — Impact of Adopting ASU 2016-13 — — — Additions for Securities for which No Previous Expected Credit Losses were 0.6 5.0 5.6 Reduction Due to Sales (0.1) (0.4) (0.5) Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized 0.1 (0.1) — Write-offs Charged Against Allowance — (0.3) (0.3) End of the Period $ 0.6 $ 4.2 $ 4.8
Schedule of Other Investments	The carrying values of the Company’s Other Investments at September 30, 2021 and December 31, 2020 were: (Dollars in Millions) Sep 30, Dec 31, Company-Owned Life Insurance $ 440.7 $ 327.4 Loans to Policyholders at Unpaid Principal 289.6 297.9 Real Estate at Depreciated Cost 95.8 98.7 Mortgage Loans and Other 95.4 55.0 Total $ 921.5 $ 779.0
Investment Income	Net Investment Income for the nine and three months ended September 30, 2021 and 2020 was: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Investment Income: Interest on Fixed Income Securities $ 207.1 $ 218.0 $ 68.4 $ 72.7 Dividends on Equity Securities Excluding Alternative Investments 9.8 10.7 2.9 2.8 Alternative Investments: Equity Method Limited Liability Investments 50.9 (2.7) 12.0 8.2 Limited Liability Investments Included in Equity Securities 29.3 7.3 9.5 2.4 Total Alternative Investments 80.2 4.6 21.5 10.6 Short-term Investments 0.6 4.2 0.2 2.3 Loans to Policyholders 16.3 16.6 5.4 5.5 Real Estate 7.1 7.1 2.3 2.3 Other 23.1 9.3 9.1 2.7 Total Investment Income 344.2 270.5 109.8 98.9 Investment Expenses: Real Estate 6.8 6.5 2.6 1.2 Other Investment Expenses 18.5 18.5 5.3 5.6 Total Investment Expenses 25.3 25.0 7.9 6.8 Net Investment Income $ 318.9 $ 245.5 $ 101.9 $ 92.1
Schedule of Realized Gain (Loss)	Gross gains and losses on sales of investments in fixed maturities for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Fixed Maturities: Gains on Sales $ 42.7 $ 38.7 $ 10.3 $ 11.9 Losses on Sales (1.7) (3.5) (0.4) (1.9)
Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Schedule of Available-for-sale Securities Reconciliation	The amortized cost, gross unrealized gains and losses, allowance for expected credit loss, and estimated fair values of the Company’s Investments in Fixed Maturities at September 30, 2021 were: Amortized Gross Unrealized Allowance for Expected Credit Losses Fair Value (Dollars in Millions) Gains Losses U.S. Government and Government Agencies and Authorities $ 472.0 $ 31.4 $ (0.8) $ — $ 502.6 States and Political Subdivisions 1,780.3 148.8 (11.8) — 1,917.3 Foreign Governments 6.7 0.1 (1.1) — 5.7 Corporate Securities: Bonds and Notes 3,948.8 504.7 (15.8) (4.4) 4,433.3 Redeemable Preferred Stocks 7.0 0.4 — — 7.4 Collateralized Loan Obligations 738.6 2.0 (4.7) — 735.9 Other Mortgage- and Asset-backed 269.1 14.5 (0.7) — 282.9 Investments in Fixed Maturities $ 7,222.5 $ 701.9 $ (34.9) $ (4.4) $ 7,885.1 Note 6 - Investments (continued) The amortized cost, gross unrealized gains and losses, allowance for expected credit loss, and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2020 were: Amortized Gross Unrealized Allowance for Expected Credit Losses Fair Value (Dollars in Millions) Gains Losses U.S. Government and Government Agencies and Authorities $ 536.5 $ 48.9 $ (0.1) $ — $ 585.3 States and Political Subdivisions 1,404.3 185.4 (0.2) — 1,589.5 Foreign Governments 6.6 — (1.1) (0.3) 5.2 Corporate Securities: Bonds and Notes 3,749.5 689.5 (10.6) (3.0) 4,425.4 Redeemable Preferred Stocks 7.0 0.5 — — 7.5 Collateralized Loan Obligations 785.1 2.3 (19.7) — 767.7 Other Mortgage- and Asset-backed 203.7 21.6 — — 225.3 Investments in Fixed Maturities $ 6,692.7 $ 948.2 $ (31.7) $ (3.3) $ 7,605.9

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	The valuation of assets measured at fair value in Company’s Condensed Consolidated Balance Sheets at September 30, 2021 is summarized below. Fair Value Measurements (Dollars in Millions) Quoted Prices Significant Other Significant Measured at Net Asset Value Total Fair Value Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 135.1 $ 367.5 $ — $ — $ 502.6 States and Political Subdivisions — 1,917.3 — — 1,917.3 Foreign Governments — 5.7 — — 5.7 Corporate Securities: Bonds and Notes — 4,219.7 213.6 — 4,433.3 Redeemable Preferred Stock — 1.3 6.1 — 7.4 Collateralized Loan Obligations — 735.9 — — 735.9 Other Mortgage and Asset-backed — 268.6 14.3 — 282.9 Total Investments in Fixed Maturities 135.1 7,516.0 234.0 — 7,885.1 Equity Securities at Fair Value: Preferred Stocks: Finance, Insurance and Real Estate — 34.6 — — 34.6 Other Industries — 16.0 1.1 — 17.1 Common Stocks: Finance, Insurance and Real Estate 39.0 — — — 39.0 Other Industries 3.1 — — 3.1 Other Equity Interests: Exchange Traded Funds 546.9 — — — 546.9 Limited Liability Companies and Limited Partnerships — — — 328.9 328.9 Total Investments in Equity Securities at Fair Value 589.0 50.6 1.1 328.9 969.6 Convertible Securities at Fair Value — 44.1 — — 44.1 Total $ 724.1 $ 7,610.7 $ 235.1 $ 328.9 $ 8,898.8 The valuation of assets measured at fair value in the Company’s Consolidated Balance Sheets at December 31, 2020 is summarized below. Fair Value Measurements (Dollars in Millions) Quoted Prices Significant Other Significant Measured at Net Asset Value Total Fair Value Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 134.0 $ 451.3 $ — $ — $ 585.3 States and Political Subdivisions — 1,589.5 — — 1,589.5 Foreign Governments — 5.2 — — 5.2 Corporate Securities: Bonds and Notes — 3,992.4 433.0 — 4,425.4 Redeemable Preferred Stocks — 1.3 6.2 — 7.5 Collateralized Loan Obligations — 767.7 — — 767.7 Other Mortgage and Asset-backed — 215.3 10.0 — 225.3 Total Investments in Fixed Maturities 134.0 7,022.7 449.2 — 7,605.9 Equity Securities at Fair Value: Preferred Stocks: Finance, Insurance and Real Estate — 43.7 — — 43.7 Other Industries — 15.4 — — 15.4 Common Stocks: Finance, Insurance and Real Estate 8.7 1.7 — — 10.4 Other Industries 0.4 — — — 0.4 Other Equity Interests: Exchange Traded Funds 496.4 — — — 496.4 Limited Liability Companies and Limited Partnerships — — — 292.2 292.2 Total Investments in Equity Securities at Fair Value 505.5 60.8 — 292.2 858.5 Other Investments: Convertible Securities at Fair Value — 39.9 — — 39.9 Total $ 639.5 $ 7,123.4 $ 449.2 $ 292.2 $ 8,504.3
Fair Value Measurement Inputs and Valuation Techniques	The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments classified as Level 3 at September 30, 2021. (Dollars in Millions) Unobservable Input Total Fair Value Range of Unobservable Inputs Weighted-average Yield Investment-grade Market Yield $ 89.7 1.9 % 10.0 % 5.3 % Non-investment-grade: Senior Debt Market Yield 40.9 5.1 18.5 9.2 Junior Debt Market Yield 68.0 5.9 29.0 14.7 Other Various 35.4 Total Level 3 Fixed Maturity Investments $ 234.0 The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments classified as Level 3 at December 31, 2020. (Dollars in Millions) Unobservable Input Total Fair Value Range of Unobservable Inputs Weighted-average Yield Investment-grade Market Yield $ 246.7 1.4 % 13.0 % 3.8 % Non-investment-grade: Senior Debt Market Yield 111.1 2.4 23.4 9.5 Junior Debt Market Yield 64.6 3.1 27.9 13.7 Other Various 26.8 Total Level 3 Fixed Maturity Investments $ 449.2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the nine months ended September 30, 2021 is presented below. Fixed Maturities Equity Securities (Dollars in Millions) Corporate Redeemable Collateralized Loan Obligations Other Mortgage- Preferred Total Balance at Beginning of Year $ 433.0 $ 6.2 $ — $ 10.0 $ — $ 449.2 Total Gains (Losses): Included in Condensed Consolidated Statement of Income 0.9 — — — 0.3 1.2 Included in Other Comprehensive Income (Loss) 5.5 (0.1) 0.1 (0.5) — 5.0 Purchases 46.9 — 17.7 16.2 1.7 82.5 Settlements — — — (0.1) — (0.1) Sales (94.4) — (10.0) (0.2) — (104.6) Transfers into Level 3 2.5 — 10.0 — 1.7 14.2 Transfers out of Level 3 (180.8) — (17.8) (11.1) (2.6) (212.3) Balance at End of Period $ 213.6 $ 6.1 $ — $ 14.3 $ 1.1 $ 235.1 The transfers into and out of Level 3 were due primarily to changes in the availability of market observable inputs. Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the three months ended September 30, 2021 is presented below. Fixed Maturities Equity Securities (Dollars in Millions) Corporate Redeemable Collateralized Loan Obligations Other Mortgage- Preferred Total Balance at Beginning of Period $ 409.2 $ 6.2 $ 27.8 $ 18.2 $ 3.4 $ 464.8 Total Gains (Losses): Included in Condensed Consolidated Statement of Income 0.9 — — — 0.3 1.2 Included in Other Comprehensive Income (Loss) 4.7 (0.1) — — — 4.6 Purchases 7.4 — — 7.2 — 14.6 Settlements — — — — — — Sales (28.4) — (10.0) — — (38.4) Transfers into Level 3 — — — — — — Transfers out of Level 3 (180.2) — (17.8) (11.1) (2.6) (211.7) Balance at End of Period $ 213.6 $ 6.1 $ — $ 14.3 $ 1.1 $ 235.1 The transfers into and out of Level 3 were due primarily to changes in the availability of market observable inputs. Note 7 - Fair Value Measurements (continued) Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the nine months ended September 30, 2020 is presented below. Fixed Maturities (Dollars in Millions) Corporate States and Political Sub- divisions Redeemable Collateralized Loan Obligations Other Mortgage- Total Balance at Beginning of Year $ 409.1 $ — $ 6.7 $ 618.2 $ 10.2 $ 1,044.2 Total Gains (Losses): Included in Condensed Consolidated Statement of Income (6.3) — — (0.3) — (6.6) Included in Other Comprehensive Income (Loss) (1.0) 0.1 0.6 (9.4) 0.3 (9.4) Purchases 150.1 0.6 — 53.5 — 204.2 Settlements — — — — (0.1) (0.1) Sales (77.5) — (0.1) (26.4) (0.2) (104.2) Transfers into Level 3 7.4 — — — — 7.4 Transfers out of Level 3 — (0.7) (1.2) (635.6) — (637.5) Balance at End of Period $ 481.8 $ — $ 6.0 $ — $ 10.2 $ 498.0 The transfers into and out of Level 3 were due to changes in the availability of market observable inputs. Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the three months ended September 30, 2020 is presented below. Fixed Maturities (Dollars in Millions) Corporate States and Political Sub- divisions Redeemable Collateralized Loan Obligations Other Mortgage- Total Balance at Beginning of Period $ 452.3 $ — $ 5.4 $ — $ 10.3 $ 468.0 Total Gains (Losses): Included in Condensed Consolidated Statement of Income (1.3) — — — — (1.3) Included in Other Comprehensive Income (Loss) 5.1 — 0.7 — (0.1) 5.7 Purchases 69.5 — — — — 69.5 Settlements — — — — — — Sales (43.8) — (0.1) — — (43.9) Transfers into Level 3 — — — — — — Transfers out of Level 3 — — — — — — Balance at End of Period $ 481.8 $ — $ 6.0 $ — $ 10.2 $ 498.0
Fair Value, by Balance Sheet Grouping	Presented below are the carrying values and fair value estimates of financial instruments not carried at fair value. September 30, 2021 December 31, 2020 (Dollars in Millions) Carrying Value Fair Value Carrying Value Fair Value Financial Assets: Loans to Policyholders $ 289.6 $ 289.6 $ 297.9 $ 297.9 Short-term Investments 259.7 259.7 875.4 875.4 Mortgage Loans 94.0 94.0 54.6 54.6 Company-Owned Life Insurance 440.7 440.7 $ 327.4 $ 327.4 Equity Securities at Modified Cost 33.0 37.7 40.1 40.1 Financial Liabilities: Long-term Debt $ 1,122.1 $ 1,166.1 $ 1,172.8 $ 1,247.8 Policyholder Obligations 378.9 378.9 407.8 407.8

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Variable Interest Entities	The following table presents information regarding activity in the Company’s Alternative Energy Partnership Investments as of the periods indicated: Nine Months Ended Three Months Ended (Dollars in millions) Sep 30, 2021 Sep 30, 2020 Sep 30, 2021 Sep 30, 2020 Fundings $ 80.0 $ — $ 31.5 $ — Cash distribution from investment 0.2 — 0.2 — Gain (loss) on investments in Alternative Energy Partnership (46.9) — (23.8) — Income tax credits recognized 64.8 — 28.7 — Tax benefit (expense) recognized from Alternative Energy Partnership 3.0 — 1.9 — The following table represents the carrying value of the associated assets and liabilities and the associated maximum loss exposure of the Alternative Energy Partnership Investments as of the dates indicated: (Dollars in millions) Sep 30, 2021 Cash $ 17.2 Equipment, net of depreciation 245.4 Other assets 3.4 Total unconsolidated assets 266.0 Maximum loss exposure 54.2

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Schedule of Comprehensive Income	The tables below display the changes in Accumulated Other Comprehensive Income (Loss) by component for the three months ended September 30, 2021 and 2020. (Dollars in Millions) Net Unrealized Gains (Losses) on Other Investments Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrecognized Postretirement Benefit Costs Gain (Loss) on Cash Flow Hedges Total Balance as of July 1, 2021 594.0 (4.0) (44.9) (2.1) 543.0 Other Comprehensive Income (Loss) Before Reclassifications (56.5) 0.4 — — (56.1) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $2.0, $—, $0.1, $(0.1) and $2.0 (7.5) — (0.1) 0.1 (7.5) Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $16.8, $(0.1), $0.1, $(0.1) and $16.7 (64.0) 0.4 (0.1) 0.1 (63.6) Balance as of September 30, 2021 530.0 (3.6) (45.0) (2.0) 479.4	(Dollars in Millions) Net Unrealized Gains (Losses) on Other Investments Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrecognized Postretirement Benefit Costs Gain (Loss) on Cash Flow Hedges Total Balance as of July 1, 2020 602.3 (2.9) (99.5) (2.6) 497.3 Other Comprehensive Income (Loss) Before Reclassifications 57.0 1.0 0.7 0.1 58.8 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $1.9, $—, $—, $— and $1.9 (7.1) — — — (7.1) Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(13.2), $(0.3), $(0.2), $(0.1) and $(13.8) 49.9 1.0 0.7 0.1 51.7 Balance as of September 30, 2020 652.2 (1.9) (98.8) (2.5) 549.0	The tables below display the changes in Accumulated Other Comprehensive Income (Loss) by component for the nine months ended September 30, 2021 and 2020 (Dollars in Millions) Net Unrealized Gains (Losses) on Other Investments Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrecognized Postretirement Benefit Costs Gain (Loss) on Cash Flow Hedges Total Balance as of January 1, 2021 730.6 (2.1) (45.7) (2.3) 680.5 Other Comprehensive Income (Loss) Before Reclassifications (172.8) (1.5) — — (174.3) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $7.4, $—, $0.5, $(0.1) and $7.8 (27.8) — 0.7 0.3 (26.8) Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $53.4, $0.4, $0.5, $(0.1) and $54.2 (200.6) (1.5) 0.7 0.3 (201.1) Balance as of September 30, 2021 530.0 (3.6) (45.0) (2.0) 479.4	(Dollars in Millions) Net Unrealized Gains (Losses) on Other Investments Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrecognized Postretirement Benefit Costs Gain (Loss) on Cash Flow Hedges Total Balance as of January 1, 2020 439.4 — (100.6) (2.7) 336.1 Other Comprehensive Income (Loss) Before Reclassifications 225.8 (1.9) 1.8 0.2 225.9 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $3.4, $—, $—, $— and $3.4 (13.0) — — — (13.0) Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(56.5), $0.5, $(0.5), $(0.1) and $(56.6) 212.8 (1.9) 1.8 0.2 212.9 Balance as of September 30, 2020 652.2 (1.9) (98.8) (2.5) 549.0

Pension Benefits and Postreti_2

Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)	9 Months Ended
	Sep. 30, 2021
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	The components of Pension (Benefit) Expense for the Pension Plan for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Interest Cost on Projected Benefit Obligation $ 5.3 $ 13.5 $ 1.8 $ 4.5 Expected Return on Plan Assets (7.0) (22.0) (2.3) (7.3) Amortization of Net Actuarial Loss 2.2 4.6 0.7 1.6 Total Pension (Benefit) Expense $ 0.5 $ (3.9) $ 0.2 $ (1.2)
Postretirement Benefits Other than Pensions
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	The components of OPEB benefits for the OPEB Plans for the nine and three months ended September 30, 2021 and 2020 were: Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Service Cost $ 0.2 $ 0.1 $ 0.1 $ — Interest Cost on Accumulated Postretirement Benefit Obligation 0.1 0.2 — — Amortization of Prior Service Credit (1.0) (0.9) (0.3) (0.2) Amortization of Net Gain (1.3) (1.4) (0.6) (0.4) Total OPEB (Benefit) Expense $ (2.0) $ (2.0) $ (0.8) $ (0.6)

Policyholder Contract Liabili_2

Policyholder Contract Liabilities (Tables)	9 Months Ended
	Sep. 30, 2021
Insurance [Abstract]
Schedule of Liability for Future Policy Benefits, by Product Segment	Policyholder Obligations at September 30, 2021 and December 31, 2020 were as follows: (Dollars in Millions) Sep 30, Dec 31, FHLB Funding Agreements $ 378.9 $ 407.8 Universal Life-type Policyholder Account Balances 102.9 59.2 Total $ 481.8 $ 467.0
Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank	United Insurance’s liability under the funding agreements with the FHLB of Chicago, the amount of collateral pledged under such agreements and FHLB of Chicago common stock owned by United Insurance at September 30, 2021 and December 31, 2020 is presented below. (Dollars in Millions) Sep 30, Dec 31, Liability under Funding Agreements $ 378.9 $ 407.8 Fair Value of Collateral Pledged 547.8 530.5 FHLB of Chicago Common Stock Owned at Cost 11.8 11.8

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Total amortized cost of Long-term Debt outstanding at September 30, 2021 and December 31, 2020 was: (Dollars in Millions) Sep 30, Dec 31, Term Loan due July 5, 2023 $ — $ 49.9 5.000% Senior Notes due September 19, 2022 277.1 278.3 4.350% Senior Notes due February 15, 2025 448.9 448.8 2.400% Senior Notes due September 30, 2030 396.1 395.8 Total Long-term Debt Outstanding $ 1,122.1 $ 1,172.8

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Lease, Cost	The following table presents operating lease right-of-use assets and lease liabilities. (Dollars in Millions) Sep 30, Dec 31, Operating Lease Right-of-Use Assets $ 73.3 $ 68.6 Operating Lease Liabilities 97.9 89.6 Lease expenses are primarily included in Insurance Expenses in the Condensed Consolidated Statement of Income. Additional information regarding the Company’s lease cost is presented below. Nine Months Ended Three Months Ended (Dollars in Millions) Sep 30, Sep 30, Sep 30, Sep 30, Lease Cost: Amortization of Right-of-Use Assets - Finance Leases $ 0.2 $ 0.2 $ 0.1 $ — Operating Lease Cost 16.8 15.9 5.8 5.1 Variable Lease Cost 0.1 — — — Short-Term Lease Cost (1) 2.4 — 0.8 — Total Lease Expense $ 19.5 $ 16.1 $ 6.7 5.1 Less: Sub-Lease Income 0.2 — 0.2 — Total Lease Cost $ 19.3 $ 16.1 $ 6.5 $ 5.1 (1) - Leases with an initial term of twelve months or less are not recorded on the Condensed Consolidated Balance Sheets. Supplemental cash flow information related to the Company’s operating and finance leases for the nine months ended September 30, 2021 and 2020 is as follows: Nine Months Ended (Dollars in Millions) Sep 30, Sep 30, Operating Cash Flows from Operating Lease (Fixed Payments) $ 17.5 $ 14.8 Operating Cash Flows from Operating Lease (Liability Reduction) 15.6 14.0 Financing Cash Flows from Finance Leases 0.2 0.2 Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities 19.4 8.2 Significant judgments and assumptions for determining lease asset and liability at September 30, 2021 and 2020 are presented below. Nine Months Ended Sep 30, Sep 30, Weighted-average Remaining Lease Term - Finance Leases 1.3 years 1.0 year Weighted-average Remaining Lease Term - Operating Leases 6.5 years 6.5 years Weighted-average Discount Rate - Finance Leases 0.6 % 4.0 % Weighted-average Discount Rate - Operating Leases 3.3 % 3.7 %
Schedule of Future Minimum Lease Payments for Capital and Operating Leases	Future minimum lease payments under operating leases at September 30, 2021 are presented below. There are no significant future minimum lease payments under finance leases. (Dollars in Millions) Remainder of 2021 $ 6.3 2022 24.1 2023 21.2 2024 15.4 2025 10.3 2026 and Thereafter 34.4 Total Future Payments $ 111.7 Less Imputed Interest 13.8 Present Value of Minimum Lease Payments $ 97.9

Net Income Per Unrestricted S_3

Net Income Per Unrestricted Share - Reconciliation of Numerator and Denominator Used in Calculation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Net Income (Loss)	$ (75.3)	$ 122.3	$ (14.7)	$ 312.4
Dilutive Effect on Income of Equity-based Compensation Equivalent Shares	0	0	0	0
Diluted Net Income (Loss) Attributed to Unrestricted Shares	$ (75.3)	$ 122.2	$ (14.7)	$ 312.1
Weighted-Average Unrestricted Shares Outstanding (in shares)	63,628,100	65,362,500	64,469,900	65,710,800
Equity-based Compensation Equivalent Shares (in shares)	0	1,271,000	0	1,086,600
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution (in shares)	63,628,100	66,633,500	64,469,900	66,797,400
Basic (in dollars per share)	$ (1.18)	$ 1.87	$ (0.23)	$ 4.75
Diluted (in dollars per share)	$ (1.18)	$ 1.83	$ (0.23)	$ 4.67
Common Stock
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Net Income (Loss)	$ (75.3)	$ 122.2	$ (14.7)	$ 312.1
Participating Awards
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Net Income (Loss)	$ 0	$ 0.1	$ 0	$ 0.3

Net Income Per Unrestricted S_4

Net Income Per Unrestricted Share - Antidilutive (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	2,170,200	876,100	2,205,400	873,300
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	2,170,200	876,100	2,205,400	873,300

Acquisition of Business - Narra

Acquisition of Business - Narrative (Details) - American Access Casualty Company	Nov. 23, 2020USD ($)	Sep. 30, 2021agent	Mar. 31, 2021USD ($)
Business Acquisition [Line Items]
Cash consideration	$ 370,900,000
Direct premiums			$ 350,000,000
Number of independent agents | agent		600

Acquisition of Business - Recog

Acquisition of Business - Recognized Identified Assets Acquired and Liabilities Assumed (Details) $ in Millions	Apr. 01, 2021USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 370.9
Property and Casualty Insurance Reserves [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(211.1)
Unearned Premium [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(177.8)
Deferred Income Tax Liabilities [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(7.8)
Other Liabilities [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(51)
Fixed Maturities at Fair Value
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	151.2
Equity Securities at Fair Value
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	82.4
Short-term Investments [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	100.1
Cash [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	54.3
Premiums Receivable [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	148.9
Receivables Other than Premium Receivable [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	2
Goodwill [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	198
Current Income Tax Asset [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	0.3
Other Assets [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 81.4

Acquisition of Business - Intan

Acquisition of Business - Intangible Assets (Details) $ in Millions	Apr. 01, 2021USD ($)
American Access Casualty Company
Business Acquisition [Line Items]
Present Value of Future Insurance Profits, Net	$ 42.9
License
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	2.5
Customer Relationships
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	4.8
Agent Relationships
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	7.2
Software Development
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	6.5
Trade Names
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 1.8

Acquisition of Business - Pro F

Acquisition of Business - Pro Forma Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Total Revenues	$ 1,455.4	$ 1,449.9	$ 4,406.3	$ 4,094
Total Expenses	1,583.6	1,293.5	4,484.9	3,685.9
Net Income	(128.2)	156.4	(78.6)	408.1
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax	$ (74.1)	$ 127.4	$ 0.1	$ 331.6

Business Segments - Narrative (

Business Segments - Narrative (Details)	9 Months Ended
	Sep. 30, 2021segment
Segment Reporting [Abstract]
Number of operating segments	3

Business Segments - Earned Prem

Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Earned Premiums	$ 1,356.1	$ 1,206.5	$ 3,894.6	$ 3,458.2
Operating Segments | Specialty Property & Casualty Insurance
Segment Reporting Information [Line Items]
Earned Premiums	1,028.3	871.4	2,916.2	2,452.9
Operating Segments | Preferred Property & Casualty Insurance
Segment Reporting Information [Line Items]
Earned Premiums	163.7	174.5	489.1	519
Operating Segments | Life & Health Insurance
Segment Reporting Information [Line Items]
Earned Premiums	164.1	160.6	489.3	486.3
Operating Segments | Specialty Automobile | Specialty Property & Casualty Insurance
Segment Reporting Information [Line Items]
Earned Premiums	920.6	792.2	2,615.6	2,235.2
Operating Segments | Commercial Automobile | Specialty Property & Casualty Insurance
Segment Reporting Information [Line Items]
Earned Premiums	107.7	79.2	300.6	217.7
Operating Segments | Personal Automobile | Preferred Property & Casualty Insurance
Segment Reporting Information [Line Items]
Earned Premiums	102.6	110.6	309.1	324.6
Operating Segments | Homeowners | Preferred Property & Casualty Insurance
Segment Reporting Information [Line Items]
Earned Premiums	52.5	55	154.6	167.4
Operating Segments | Other Personal Lines | Preferred Property & Casualty Insurance
Segment Reporting Information [Line Items]
Earned Premiums	8.6	8.9	25.4	27
Operating Segments | Life | Life & Health Insurance
Segment Reporting Information [Line Items]
Earned Premiums	101.5	96.3	300.2	289.2
Operating Segments | Accident and Health | Life & Health Insurance
Segment Reporting Information [Line Items]
Earned Premiums	47	48.9	142.3	149.1
Operating Segments | Property | Life & Health Insurance
Segment Reporting Information [Line Items]
Earned Premiums	$ 15.6	$ 15.4	$ 46.8	$ 48

Business Segments - Segment Rev

Business Segments - Segment Revenues (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Earned Premiums	$ 1,356.1		$ 1,206.5	$ 3,894.6	$ 3,458.2
Net Investment Income	101.9		92.1	318.9	245.5
Change in Value of Alternative Energy Partnership Investments	(23.8)		0	(46.9)	0
Other Income (Loss)	12.3		0.9	20.8	92.7
Total Revenues	1,455.4		1,353.7	4,315.1	3,813.6
Income (Loss) from Change in Fair Value of Equity and Convertible Securities	(0.6)		45.2	92.4	(1)
Impairment Losses	(0.6)		(1)	(7.8)	(20)
Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	1,435.1		1,298.4	4,169.2	3,706.8
Operating Segments | Specialty Property & Casualty Insurance
Segment Reporting Information [Line Items]
Earned Premiums	1,028.3		871.4	2,916.2	2,452.9
Net Investment Income	37		30.5	114.7	76.2
Change in Value of Alternative Energy Partnership Investments	(11.3)			(22.3)
Other Income (Loss)	1.2		0.4	3.1	1.4
Total Revenues	1,055.2		902.3	3,011.7	2,530.5
Operating Segments | Preferred Property & Casualty Insurance
Segment Reporting Information [Line Items]
Earned Premiums	163.7		174.5	489.1	519
Net Investment Income	16.1		10.3	51.5	24.3
Change in Value of Alternative Energy Partnership Investments	(6.4)			(12.5)
Other Income (Loss)	0	$ 0.1	0	0
Total Revenues	173.4		184.8	528.1	543.4
Operating Segments | Life & Health Insurance
Segment Reporting Information [Line Items]
Earned Premiums	164.1		160.6	489.3	486.3
Net Investment Income	48.4		50.7	151.9	146
Change in Value of Alternative Energy Partnership Investments	(6.1)			(12.1)
Other Income (Loss)	0.1		0	0.3	0.6
Total Revenues	206.5		211.3	629.4	632.9
Segment Reconciling Items
Segment Reporting Information [Line Items]
Income (Loss) from Change in Fair Value of Equity and Convertible Securities	(0.6)		45.2	92.4	(1)
Gain (Loss) on Sale of Investments	10.1		10	43.1	38.2
Impairment Losses	(0.6)		(1)	(7.8)	(20)
Other	$ 11.4		$ 1.1	$ 18.2	$ 89.6

Business Segments - Segment Ope

Business Segments - Segment Operating Profit (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (130.6)	$ 112.3	$ (190.8)	$ 415.6
Corporate and Other Operating Income (Loss) From:
Income (Loss) from Change in Fair Value of Equity and Convertible Securities	(0.6)	45.2	92.4	(1)
Debt and Equity Securities, Realized Gain (Loss)	10.1	10	43.1	38.2
Impairment Losses	0.6	1	7.8	20
Income (Loss) before Income Taxes	(129.8)	152.1	(97.9)	389.5
Operating Segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	(115.1)	123.3	(150)	353
Operating Segments | Specialty Property & Casualty Insurance
Segment Reporting Information [Line Items]
Operating Income (Loss)	(91.8)	149.9	(128.7)	309.4
Operating Segments | Preferred Property & Casualty Insurance
Segment Reporting Information [Line Items]
Operating Income (Loss)	(17.4)	(41.8)	(27.8)	(18)
Operating Segments | Life & Health Insurance
Segment Reporting Information [Line Items]
Operating Income (Loss)	(5.9)	15.2	6.5	61.6
Corporate and Other
Segment Reporting Information [Line Items]
Operating Income (Loss)	(15.5)	(11)	(40.8)	62.6
Corporate and Other Operating Income (Loss) From:
Partial Satisfaction of Judgment	0	0	0	89.4
Other	(15.5)	(11)	(40.8)	(26.8)
Segment Reconciling Items
Corporate and Other Operating Income (Loss) From:
Income (Loss) from Change in Fair Value of Equity and Convertible Securities	(0.6)	45.2	92.4	(1)
Debt and Equity Securities, Realized Gain (Loss)	10.1	10	43.1	38.2
Impairment Losses	0.6	1	7.8	20
Acquisition Related Transaction, Integration and Other Costs	$ (8.1)	$ (14.4)	$ (34.8)	$ (43.3)

Business Segments - Segment Net

Business Segments - Segment Net Operating Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Segment Net Operating Income (Loss)	$ (75.8)	$ 90.9	$ (88)	$ 333
Net Income (Loss)	(75.3)	122.3	(14.7)	312.4
Operating Segments
Segment Reporting Information [Line Items]
Segment Net Operating Income (Loss)	(62.9)	98.7	(52.9)	284
Operating Segments | Specialty Property & Casualty Insurance
Segment Reporting Information [Line Items]
Segment Net Operating Income (Loss)	(59.3)	119.2	(70.9)	246.8
Operating Segments | Preferred Property & Casualty Insurance
Segment Reporting Information [Line Items]
Segment Net Operating Income (Loss)	(6.4)	(32.7)	(5.1)	(13.4)
Operating Segments | Life & Health Insurance
Segment Reporting Information [Line Items]
Segment Net Operating Income (Loss)	2.8	12.2	23.1	50.6
Corporate and Other
Segment Reporting Information [Line Items]
Segment Net Operating Income (Loss)	(12.9)	(7.8)	(35.1)	49
Partial Satisfaction of Judgment	0	0	0	70.6
Other	(12.9)	(7.8)	(35.1)	(21.6)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Change in Fair Value of Equity and Convertible Securities	(0.5)	35.7	73	(0.8)
Net Realized Gains on Sales of Investments	7.9	7.9	34	30.2
Impairment Losses	(0.5)	(0.8)	(6.2)	(15.8)
Acquisition Related Transaction, Integration and Other Costs	$ (6.4)	$ (11.4)	$ (27.5)	$ (34.2)

Property and Casualty Insuran_3

Property and Casualty Insurance Reserves - Reserve Activity (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross of Reinsurance at Beginning of Year	$ 1,982.5
Incurred Losses and LAE Related to:
Incurred Losses and LAE Related to Prior Years	107.9	$ 28.3
Paid Losses and LAE Related to:
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period	2,596.2
Property, Liability and Casualty Insurance Product Line
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross of Reinsurance at Beginning of Year	1,982.5	1,969.8
Less Reinsurance Recoverables at Beginning of Year	50.1	65.6
Property and Casualty Insurance Reserves - Net of Reinsurance at Beginning of Year	1,932.4	1,904.2
Property and Casualty Insurance Reserves Acquired, Net of Reinsurance	211.1	0
Incurred Losses and LAE Related to:
Incurred Losses and LAE Related to Current Year	2,885.7	2,132.3
Incurred Losses and LAE Related to Prior Years	107.9	28.3
Total Incurred Losses and LAE	2,993.6	2,160.6
Paid Losses and LAE Related to:
Paid Losses and LAE Related to Current Year	1,503.9	1,133.7
Paid Losses and LAE Related to Prior Years	1,080.4	1,032.9
Total Paid Losses and LAE	2,584.3	2,166.6
Property and Casualty Insurance Reserves - Net of Reinsurance at End of Period	2,552.8	1,898.2
Plus Reinsurance Recoverables at End of Period	43.4	51.8
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period	$ 2,596.2	$ 1,950

Property and Casualty Insuran_4

Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Losses and LAE Related to Prior Years	$ (107.9)	$ (28.3)
Specialty Automobile
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Losses and LAE Related to Prior Years	(97)	(31.3)
Personal Automobile
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Losses and LAE Related to Prior Years	(4.9)	(17.2)
Homeowners
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Losses and LAE Related to Prior Years	4.3	3
Other Personal Lines
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Losses and LAE Related to Prior Years	(2)	2.8
Commercial Automobile
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Losses and LAE Related to Prior Years	$ (8.3)	$ 14.4

Property and Casualty Insuran_5

Property and Casualty Insurance Reserves - Allowance for Credit Losses from Policyholders (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Premium Receivable, Allowance for Credit Loss [Roll Forward]
Premium Receivable, Allowance for Credit Loss, Beginning Balance		$ 20.9
Premium Receivable, Allowance for Credit Loss, Ending Balance	$ 20.4	12.7
Premiums Receivable, Net	1,249.3	1,481.2	$ 1,194.5	$ 1,117.1
Premium receivables, allowance for credit losses	20.4	12.7	$ 20.9	$ 22.3
Provision for Expected Credit Losses	31.9	36.7
Premium Receivable, Allowance for Credit Loss, Writeoff	$ 33.8	$ 44.9

Investments - Schedule of Fixed

Investments - Schedule of Fixed Maturities (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, at amortized cost	$ 7,222,500,000	$ 6,692,700,000
Gross unrealized gains	701,900,000
Gross unrealized loss	(34,900,000)
Fixed maturities, allowance for credit losses	(4,400,000)	(3,300,000)	$ (4,800,000)	$ 0
Fixed maturities at fair value	7,885,100,000	7,605,900,000
Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, at amortized cost		6,692,700,000
Gross unrealized gains		948,200,000
Gross unrealized loss		(31,700,000)
Fixed maturities at fair value		7,605,900,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss	34,900,000	31,700,000
Investments in Fixed Maturities | Investment-grade
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, unrealized loss position, accumulated loss	27,200,000	8,000,000
U.S. Government and Government Agencies and Authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, at amortized cost	472,000,000	536,500,000
Gross unrealized gains	31,400,000	48,900,000
Gross unrealized loss	(800,000)	(100,000)
Fixed maturities, allowance for credit losses	0
Fixed maturities at fair value	502,600,000	585,300,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss	800,000	100,000
States and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, at amortized cost	1,780,300,000	1,404,300,000
Gross unrealized gains	148,800,000	185,400,000
Gross unrealized loss	(11,800,000)	(200,000)
Fixed maturities, allowance for credit losses	0
Fixed maturities at fair value	1,917,300,000	1,589,500,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss	11,800,000	200,000
Foreign Governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, at amortized cost	6,700,000	6,600,000
Gross unrealized gains	100,000	0
Gross unrealized loss	(1,100,000)	(1,100,000)
Fixed maturities, allowance for credit losses	0	(300,000)	(600,000)	0
Fixed maturities at fair value	5,700,000	5,200,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss	1,100,000	1,100,000
Bonds and Notes
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, at amortized cost	3,948,800,000	3,749,500,000
Gross unrealized gains	504,700,000	689,500,000
Gross unrealized loss	(15,800,000)	(10,600,000)
Fixed maturities, allowance for credit losses	(4,400,000)	(3,000,000)	$ (4,200,000)	$ 0
Fixed maturities at fair value	4,433,300,000	4,425,400,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss	15,800,000	10,600,000
Redeemable Preferred Stocks
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, at amortized cost	7,000,000	7,000,000
Gross unrealized gains	400,000	500,000
Gross unrealized loss	0	0
Fixed maturities, allowance for credit losses	0
Fixed maturities at fair value	7,400,000	7,500,000
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, at amortized cost	738,600,000	785,100,000
Gross unrealized gains	2,000,000	2,300,000
Gross unrealized loss	(4,700,000)	(19,700,000)
Fixed maturities, allowance for credit losses	0
Fixed maturities at fair value	735,900,000	767,700,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss	4,700,000	19,700,000
Other Mortgage- and Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, at amortized cost	269,100,000	203,700,000
Gross unrealized gains	14,500,000	21,600,000
Gross unrealized loss	(700,000)	0
Fixed maturities, allowance for credit losses	0
Fixed maturities at fair value	282,900,000	225,300,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss	$ 700,000	$ 0

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	$ 1,367,400,000		$ 1,367,400,000
Fixed maturities, allowance for credit losses	4,400,000	$ 4,800,000	4,400,000	$ 4,800,000	$ 3,300,000	$ 0
Equity securities	969,600,000		969,600,000		858,500,000
Equity securities, FV-NI, unrealized gain (loss)	107,300,000
Equity securities without readily determinable fair value, impairment loss, annual amount	700,000		4,100,000
Equity securities without readily determinable fair value, downward price adjustment, cumulative amount	500,000		500,000
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount	0		0
Equity securities without readily determinable fair value, impairment loss, cumulative amount	9,900,000		9,900,000
Other Receivables	207,300,000		207,300,000		222,400,000
Equity Securities at Fair Value (Cost: 2021 - $725.1; 2020 - $684.1)	969,600,000		969,600,000		858,500,000
Government National Mortgage Association Certificates and Obligations (GNMA)
Debt Securities, Available-for-sale [Line Items]
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	293,800,000		293,800,000
Federal National Mortgage Association Certificates and Obligations (FNMA)
Debt Securities, Available-for-sale [Line Items]
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	28,800,000		28,800,000
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)
Debt Securities, Available-for-sale [Line Items]
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	26,000,000		26,000,000
Other Non-Governmental Issuers
Debt Securities, Available-for-sale [Line Items]
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	1,018,800,000		1,018,800,000
Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, unrealized loss position, accumulated loss	34,900,000		34,900,000		31,700,000
12 Months or Longer	4,800,000		4,800,000		20,000,000
Other Receivables	6,800,000		6,800,000		5,100,000
Other liabilities	38,700,000		38,700,000		4,300,000
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Other Receivables	200,000		200,000
Other liabilities	0		0
Equity Securities | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Line Items]
Equity securities	969,600,000		969,600,000		858,500,000
Equity Securities at Fair Value (Cost: 2021 - $725.1; 2020 - $684.1)	969,600,000		969,600,000		858,500,000
Equity Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Line Items]
Equity securities	589,000,000		589,000,000		505,500,000
Equity Securities at Fair Value (Cost: 2021 - $725.1; 2020 - $684.1)	589,000,000		589,000,000		505,500,000
Preferred Stocks | Other Industries | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Line Items]
Equity securities	17,100,000		17,100,000		15,400,000
Equity Securities at Fair Value (Cost: 2021 - $725.1; 2020 - $684.1)	17,100,000		17,100,000		15,400,000
Preferred Stocks | Other Industries | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Line Items]
Equity securities	0		0		0
Equity Securities at Fair Value (Cost: 2021 - $725.1; 2020 - $684.1)	0		0		0
Common Stock | Other Industries | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Line Items]
Equity securities	3,100,000		3,100,000		400,000
Equity Securities at Fair Value (Cost: 2021 - $725.1; 2020 - $684.1)	3,100,000		3,100,000		400,000
Common Stock | Other Industries | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Line Items]
Equity securities	3,100,000		3,100,000		400,000
Equity Securities at Fair Value (Cost: 2021 - $725.1; 2020 - $684.1)	3,100,000		3,100,000		400,000
Bonds and Notes
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, unrealized loss position, accumulated loss	15,800,000		15,800,000		10,600,000
12 Months or Longer	1,800,000		1,800,000		3,100,000
Fixed maturities, allowance for credit losses	4,400,000	4,200,000	4,400,000	4,200,000	3,000,000	$ 0
Variable Interest Entity, Not Primary Beneficiary
Debt Securities, Available-for-sale [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	54,200,000		54,200,000
Variable Interest Entity, Funding Investment Commitment, Funding	31,500,000	$ 0	80,000,000	$ 0
Variable Interest Entity, Not Primary Beneficiary | Equity Method Limited Liability Investments
Debt Securities, Available-for-sale [Line Items]
Outstanding commitments to fund equity method limited liability investments	83,700,000		83,700,000
Investment-grade | Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, unrealized loss position, accumulated loss	27,200,000		27,200,000		8,000,000
Non-investment-grade | Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, unrealized loss position, accumulated loss	$ 7,700,000		$ 7,700,000		$ 23,700,000
Percentage of unrealized loss position to amortized cost basis of available for sale security average	5.00%		5.00%		11.00%

Investments - Amortized Costs a

Investments - Amortized Costs and Estimated Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Due in One Year or Less	$ 67.5
Due after One Year to Five Years	1,004.2
Due after Five Years to Ten Years	1,581.3
Due after Ten Years	3,228.2
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	1,341.3
Fixed maturities, at amortized cost	7,222.5	$ 6,692.7
Fair Value
Due in One Year or Less	69.4
Due after One Year to Five Years	1,065.5
Due after Five Years to Ten Years	1,700.6
Due after Ten Years	3,682.2
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	1,367.4
Fixed Maturities at Fair Value (Amortized Cost: 2021 - $7,222.5; 2020 - $6,692.7 Allowance for Credit Losses: 2021 - $4.4; 2020 - $3.3)	$ 7,885.1	$ 7,605.9

Investments - Continuous Unreal

Investments - Continuous Unrealized Loss (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
U.S. Government and Government Agencies and Authorities
Fair Value
Less Than 12 Months	$ 45	$ 10.5
12 Months or Longer	1.2	0
Total	46.2	10.5
Unrealized Losses
Less Than 12 Months	(0.7)	(0.1)
12 Months or Longer	(0.1)	0
Total	(0.8)	(0.1)
States and Political Subdivisions
Fair Value
Less Than 12 Months	468.1	23.3
12 Months or Longer	0.2	0
Total	468.3	23.3
Unrealized Losses
Less Than 12 Months	(11.8)	(0.2)
12 Months or Longer	0	0
Total	(11.8)	(0.2)
Foreign Governments
Fair Value
Less Than 12 Months	0.5	0.5
12 Months or Longer	2.7	2.6
Total	3.2	3.1
Unrealized Losses
Less Than 12 Months	(0.5)	(0.1)
12 Months or Longer	(0.6)	(1)
Total	(1.1)	(1.1)
Bonds and Notes
Fair Value
Less Than 12 Months	495.1	132.9
12 Months or Longer	26.5	46.1
Total	521.6	179
Unrealized Losses
Less Than 12 Months	(14)	(7.5)
12 Months or Longer	(1.8)	(3.1)
Total	(15.8)	(10.6)
Collateralized Loan Obligations
Fair Value
Less Than 12 Months	206.1	145.2
12 Months or Longer	234.9	371.4
Total	441	516.6
Unrealized Losses
Less Than 12 Months	(2.4)	(3.8)
12 Months or Longer	(2.3)	(15.9)
Total	(4.7)	(19.7)
Other Mortgage- and Asset-backed
Fair Value
Less Than 12 Months	63.2	6.3
12 Months or Longer	0	0
Total	63.2	6.3
Unrealized Losses
Less Than 12 Months	(0.7)	0
12 Months or Longer	0	0
Total	(0.7)	0
Investments in Fixed Maturities
Fair Value
Less Than 12 Months	1,278	318.7
12 Months or Longer	265.5	420.1
Total	1,543.5	738.8
Unrealized Losses
Less Than 12 Months	(30.1)	(11.7)
12 Months or Longer	(4.8)	(20)
Total	(34.9)	(31.7)
Investments in Fixed Maturities | Non-investment-grade
Unrealized Losses
Total	$ (7.7)	$ (23.7)

Investments - Allowance for Cre

Investments - Allowance for Credit Losses (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning of the Year	$ 3,300,000	$ 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized	2,200,000	5,600,000
Reduction Due to Sales		500,000
End of the Period	4,400,000	4,800,000
Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized	(900,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff	(200,000)	(300,000)
Foreign Governments
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning of the Year	300,000	0
Additions for Securities for which No Previous Expected Credit Losses were Recognized	0	600,000
Reduction Due to Sales		100,000
End of the Period	0	600,000
Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized	(300,000)	100,000
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff	0
Bonds and Notes
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning of the Year	3,000,000	0
Additions for Securities for which No Previous Expected Credit Losses were Recognized	2,200,000	5,000,000
Reduction Due to Sales		400,000
End of the Period	4,400,000	4,200,000
Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized	(600,000)	(100,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff	$ (200,000)	$ (300,000)

Investments - Schedule of Other

Investments - Schedule of Other Investments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Company-Owned Life Insurance	$ 440.7	$ 327.4
Loans to Policyholders at Unpaid Principal	289.6	297.9
Real Estate at Depreciated Cost	95.8	98.7
Mortgage Loans and Other	95.4	55
Total	$ 921.5	$ 779

Investments - Net Investment In

Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Investment Income [Line Items]
Investment income	$ 109.8	$ 98.9	$ 344.2	$ 270.5
Investment expenses	7.9	6.8	25.3	25
Net Investment Income	101.9	92.1	318.9	245.5
Fixed Maturities
Net Investment Income [Line Items]
Investment income	68.4	72.7	207.1	218
Equity Securities
Net Investment Income [Line Items]
Investment income	2.9	2.8	9.8	10.7
Total Alternative Investments
Net Investment Income [Line Items]
Investment income	21.5	10.6	80.2	4.6
Equity Method Limited Liability Investments
Net Investment Income [Line Items]
Investment income	12	8.2	50.9	(2.7)
Limited Liability Investments Included in Equity Securities
Net Investment Income [Line Items]
Investment income	9.5	2.4	29.3	7.3
Short-term Investments
Net Investment Income [Line Items]
Investment income	0.2	2.3	0.6	4.2
Loans to Policyholders
Net Investment Income [Line Items]
Investment income	5.4	5.5	16.3	16.6
Real Estate
Net Investment Income [Line Items]
Investment income	2.3	2.3	7.1	7.1
Investment expenses	2.6	1.2	6.8	6.5
Other
Net Investment Income [Line Items]
Investment income	9.1	2.7	23.1	9.3
Investment expenses	$ 5.3	$ 5.6	$ 18.5	$ 18.5

Investments - Net Realized Gain

Investments - Net Realized Gains on Sales of Investments (Details) - Fixed Maturities - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Investment Income [Line Items]
Gains on Sales	$ 10.3	$ 11.9	$ 42.7	$ 38.7
Losses on Sales	$ (0.4)	$ (1.9)	$ (1.7)	$ (3.5)

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value Inputs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	$ 7,885,100,000		$ 7,885,100,000			$ 7,605,900,000
Equity securities	969,600,000		969,600,000			858,500,000
Purchases	14,600,000	$ 69,500,000	82,500,000	$ 204,200,000
Transfers into Level 3	0	0	14,200,000	7,400,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	235,100,000	498,000,000	235,100,000	498,000,000	$ 464,800,000	449,200,000	$ 468,000,000	$ 1,044,200,000
Included in Condensed Consolidated Statement of Operations	1,200,000	(1,300,000)	1,200,000	(6,600,000)
Transfers out of Level 3	(211,700,000)	0	(212,300,000)	(637,500,000)
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchases	0		1,700,000
Transfers into Level 3	0		1,700,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	1,100,000		1,100,000		3,400,000
Included in Condensed Consolidated Statement of Operations	300,000		300,000
Transfers out of Level 3	(2,600,000)		(2,600,000)
Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchases	0	0	17,700,000	53,500,000
Transfers into Level 3	0	0	10,000,000	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0	0	0	0	$ 27,800,000	0	$ 0	$ 618,200,000
Included in Condensed Consolidated Statement of Operations	0	0	0	(300,000)
Transfers out of Level 3	(17,800,000)	$ 0	(17,800,000)	$ (635,600,000)
Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value						7,605,900,000
U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	502,600,000		502,600,000			585,300,000
States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	1,917,300,000		1,917,300,000			1,589,500,000
Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	5,700,000		5,700,000			5,200,000
Bonds and Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	4,433,300,000		4,433,300,000			4,425,400,000
Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	7,400,000		7,400,000			7,500,000
Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	735,900,000		735,900,000			767,700,000
Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	282,900,000		282,900,000			225,300,000
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt at fair value	44,100,000		44,100,000			39,900,000
Total	8,898,800,000		8,898,800,000			8,504,300,000
Fair Value, Measurements, Recurring | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	7,885,100,000		7,885,100,000			7,605,900,000
Fair Value, Measurements, Recurring | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	502,600,000		502,600,000			585,300,000
Fair Value, Measurements, Recurring | States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	1,917,300,000		1,917,300,000			1,589,500,000
Fair Value, Measurements, Recurring | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	5,700,000		5,700,000			5,200,000
Fair Value, Measurements, Recurring | Bonds and Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	4,433,300,000		4,433,300,000			4,425,400,000
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	7,400,000		7,400,000
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value						7,500,000
Fair Value, Measurements, Recurring | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	735,900,000		735,900,000			767,700,000
Fair Value, Measurements, Recurring | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	282,900,000		282,900,000			225,300,000
Fair Value, Measurements, Recurring | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	969,600,000		969,600,000			858,500,000
Fair Value, Measurements, Recurring | Exchange Traded Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	546,900,000		546,900,000			496,400,000
Fair Value, Measurements, Recurring | Limited Liability Companies and Limited Partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	328,900,000		328,900,000			292,200,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt at fair value	0		0			0
Total	724,100,000		724,100,000			639,500,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	135,100,000		135,100,000			134,000,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	135,100,000		135,100,000			134,000,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Bonds and Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value						0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	589,000,000		589,000,000			505,500,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange Traded Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	546,900,000		546,900,000			496,400,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Limited Liability Companies and Limited Partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt at fair value	44,100,000		44,100,000			39,900,000
Total	7,610,700,000		7,610,700,000			7,123,400,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	7,516,000,000		7,516,000,000			7,022,700,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	367,500,000		367,500,000			451,300,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	1,917,300,000		1,917,300,000			1,589,500,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	5,700,000		5,700,000			5,200,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Bonds and Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	4,219,700,000		4,219,700,000			3,992,400,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	1,300,000		1,300,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value						1,300,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	735,900,000		735,900,000			767,700,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	268,600,000		268,600,000			215,300,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	50,600,000		50,600,000			60,800,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Exchange Traded Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Limited Liability Companies and Limited Partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt at fair value	0		0			0
Total	235,100,000		235,100,000			449,200,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	234,000,000		234,000,000			449,200,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Bonds and Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	213,600,000		213,600,000			433,000,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	6,100,000		6,100,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value						6,200,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	14,300,000		14,300,000			10,000,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	1,100,000		1,100,000			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Exchange Traded Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Limited Liability Companies and Limited Partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	34,600,000		34,600,000			43,700,000
Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	39,000,000		39,000,000			10,400,000
Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	39,000,000		39,000,000			8,700,000
Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	34,600,000		34,600,000			43,700,000
Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			1,700,000
Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Other Industries | Fair Value, Measurements, Recurring | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	17,100,000		17,100,000			15,400,000
Other Industries | Fair Value, Measurements, Recurring | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,100,000		3,100,000			400,000
Other Industries | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Other Industries | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,100,000		3,100,000			400,000
Other Industries | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	16,000,000		16,000,000			15,400,000
Other Industries | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Other Industries | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	1,100,000		1,100,000			0
Other Industries | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities						0
Measured at Net Asset Value | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt at fair value	0		0			0
Total	328,900,000		328,900,000			292,200,000
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Bonds and Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Redeemable Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value						0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities at fair value	0		0			0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	328,900,000		328,900,000			292,200,000
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Exchange Traded Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Limited Liability Companies and Limited Partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	328,900,000		328,900,000			292,200,000
Measured at Net Asset Value | Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Measured at Net Asset Value | Finance, Insurance and Real Estate | Fair Value, Measurements, Recurring | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Measured at Net Asset Value | Other Industries | Fair Value, Measurements, Recurring | Preferred Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0			0
Measured at Net Asset Value | Other Industries | Fair Value, Measurements, Recurring | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 0		$ 0			$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers out of Level 3	$ 211.7	$ 0	$ 212.3	$ 637.5
Limited Liability Companies and Limited Partnerships | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unfunded commitments	$ 111		$ 111

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative Information for Level 3 Inputs (Details) - Market Yield - Significant Unobservable Inputs (Level 3) $ in Millions	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.051	0.024
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.185	0.234
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.092	0.095
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.059	0.031
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.290	0.279
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Weighted-average Yield
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.147	0.137
Private Placement | Investment-grade
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total Fair Value	$ 89.7	$ 246.7
Private Placement | Measurement Input, Discount Rate | Investment-grade | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Alternative investment, measurement input	0.019	0.014
Private Placement | Measurement Input, Discount Rate | Investment-grade | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Alternative investment, measurement input	0.100	0.130
Private Placement | Measurement Input, Discount Rate | Investment-grade | Weighted-average Yield
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Alternative investment, measurement input	0.053	0.038
Senior Debt | Non-investment-grade
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total Fair Value	$ 40.9	$ 111.1
Junior Debt | Non-investment-grade
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total Fair Value	68	64.6
Other
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total Fair Value	35.4	26.8
Investments in Fixed Maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total Fair Value	$ 234	$ 449.2

Fair Value Measurements - Level

Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Total Gains (Losses):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 235,100,000	$ 498,000,000	$ 235,100,000	$ 498,000,000	$ 464,800,000	$ 449,200,000	$ 468,000,000	$ 1,044,200,000
Included in Condensed Consolidated Statement of Operations	1,200,000	(1,300,000)	1,200,000	(6,600,000)
Included in Other Comprehensive Income (Loss)	4,600,000	5,700,000	5,000,000	(9,400,000)
Purchases	14,600,000	69,500,000	82,500,000	204,200,000
Settlements	0	0	(100,000)	(100,000)
Sales	(38,400,000)	(43,900,000)	(104,600,000)	(104,200,000)
Transfers into Level 3	0	0	14,200,000	7,400,000
Transfers out of Level 3	(211,700,000)	0	(212,300,000)	(637,500,000)
Bonds and Notes
Total Gains (Losses):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	213,600,000	481,800,000	213,600,000	481,800,000	409,200,000	433,000,000	452,300,000	409,100,000
Included in Condensed Consolidated Statement of Operations	900,000	(1,300,000)	900,000	(6,300,000)
Included in Other Comprehensive Income (Loss)	4,700,000	5,100,000	5,500,000	(1,000,000)
Purchases	7,400,000	69,500,000	46,900,000	150,100,000
Settlements	0	0	0	0
Sales	(28,400,000)	(43,800,000)	(94,400,000)	(77,500,000)
Transfers into Level 3	0	0	2,500,000	7,400,000
Transfers out of Level 3	(180,200,000)	0	(180,800,000)	0
States and Political Subdivisions
Total Gains (Losses):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0		0			0	0
Included in Condensed Consolidated Statement of Operations		0		0
Included in Other Comprehensive Income (Loss)		0		100,000
Purchases		0		600,000
Settlements		0		0
Sales		0		0
Transfers into Level 3		0		0
Transfers out of Level 3		0		(700,000)
Redeemable Preferred Stocks
Total Gains (Losses):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	6,100,000	6,000,000	6,100,000	6,000,000	6,200,000	6,200,000	5,400,000	6,700,000
Included in Condensed Consolidated Statement of Operations	0	0	0	0
Included in Other Comprehensive Income (Loss)	(100,000)	700,000	(100,000)	600,000
Purchases	0	0	0	0
Settlements	0	0	0	0
Sales	0	(100,000)	0	(100,000)
Transfers into Level 3		0	0	0
Transfers out of Level 3		0	0	(1,200,000)
Collateralized Loan Obligations
Total Gains (Losses):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0	0	0	0	27,800,000	0	0	618,200,000
Included in Condensed Consolidated Statement of Operations	0	0	0	(300,000)
Included in Other Comprehensive Income (Loss)	0	0	100,000	(9,400,000)
Purchases	0	0	17,700,000	53,500,000
Settlements	0	0	0	0
Sales	(10,000,000)	0	(10,000,000)	(26,400,000)
Transfers into Level 3	0	0	10,000,000	0
Transfers out of Level 3	(17,800,000)	0	(17,800,000)	(635,600,000)
Other Mortgage- and Asset-backed
Total Gains (Losses):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	14,300,000	10,200,000	14,300,000	10,200,000	18,200,000	$ 10,000,000	$ 10,300,000	$ 10,200,000
Included in Condensed Consolidated Statement of Operations	0	0	0	0
Included in Other Comprehensive Income (Loss)	0	(100,000)	(500,000)	300,000
Purchases	7,200,000	0	16,200,000	0
Settlements	0	0	(100,000)	(100,000)
Sales	0	0	(200,000)	(200,000)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(11,100,000)	$ 0	(11,100,000)	$ 0
Equity Securities
Total Gains (Losses):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	1,100,000		1,100,000		$ 3,400,000
Included in Condensed Consolidated Statement of Operations	300,000		300,000
Purchases	0		1,700,000
Transfers into Level 3	0		1,700,000
Transfers out of Level 3	$ (2,600,000)		$ (2,600,000)

Fair Value Measurements - Balan

Fair Value Measurements - Balance Sheet Grouping (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Carrying Value
Loans to Policyholders	$ 289.6	$ 297.9
Short-term Investments at Cost which Approximates Fair Value	259.7	875.4
Mortgage Loans	94	54.6
Long-term Debt	1,122.1	1,172.8
Policyholder Obligations	481.8	467
Fair Value
Short-term Investments	259.7	875.4
Long-term Debt	1,166.1	1,247.8
Company-Owned Life Insurance	440.7	327.4
Equity Securities at Modified Cost	33	40.1
Equity Securities, FV-NI	37.7	40.1
Federal Home Loan Bank of Chicago
Fair Value
Policyholder Obligations	378.9	407.8
Loans to Policyholders
Fair Value
Loans	289.6	297.9
Mortgage Loans
Fair Value
Loans	94	54.6
United Insurance Company of America | FHLB Funding Agreements | Federal Home Loan Bank of Chicago
Carrying Value
Policyholder Obligations	$ 378.9	$ 407.8

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Income Tax Expense (Benefit)	$ (54,500,000)	$ 29,800,000	$ (83,200,000)	$ 77,100,000
Other Assets	619,300,000		619,300,000		$ 575,900,000
Variable Interest Entity, Not Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Variable Interest Entity, Funding Investment Commitment, Funding	31,500,000	0	80,000,000	0
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments	200,000	0	200,000	0
Income (Loss) from Equity Method Investments	(23,800,000)	0	(46,900,000)	0
Income Tax Credits and Adjustments	28,700,000	0	64,800,000	0
Income Tax Expense (Benefit)	1,900,000	$ 0	3,000,000	$ 0
Cash and Cash Equivalents, at Carrying Value	17,200,000		17,200,000
Property, Plant and Equipment, Net	245,400,000		245,400,000
Other Assets	3,400,000		3,400,000
Assets	266,000,000		266,000,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 54,200,000		$ 54,200,000

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Stockholders' Equity Attributable to Parent	$ 4,151.2		$ 4,151.2			$ 4,563.4
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax					$ (44.9)	(45.7)		$ (100.6)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax					(2.1)	(2.3)		(2.7)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Stockholders' Equity Attributable to Parent	(3.6)	$ (1.9)	(3.6)	$ (1.9)	(4)	(2.1)	$ (2.9)	0
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax	0.4	1	(1.5)	(1.9)
Reclassification from AOCI, Current Period, Tax	0	0	0	0
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(0.1)	(0.3)	0.4	0.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.4	1	(1.5)	(1.9)
Accumulated Other Comprehensive Income
Stockholders' Equity Attributable to Parent	479.4	549	479.4	549	543	680.5	497.3	336.1
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax	(56.1)	58.8	(174.3)	225.9
Reclassification from AOCI, Current Period, Tax	2	1.9	7.8	3.4
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax	(7.5)	(7.1)	(26.8)	(13)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	16.7	(13.8)	54.2	(56.6)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(63.6)	51.7	(201.1)	212.9
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	(45)	(98.8)	(45)	(98.8)			99.5
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax	0	0.7	0	1.8
Reclassification from AOCI, Current Period, Tax	0.1	0	0.5	0
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax	(0.1)	0	0.7	0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0.1	(0.2)	0.5	(0.5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(0.1)	0.7	0.7	1.8
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Stockholders' Equity Attributable to Parent	(2)	(2.5)	(2)	(2.5)			(2.6)
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax	0	0.1	0	0.2
Reclassification from AOCI, Current Period, Tax	(0.1)	0	(0.1)	0
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax	0.1	0	0.3	0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(0.1)	(0.1)	(0.1)	(0.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.1	0.1	0.3	0.2
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent
Stockholders' Equity Attributable to Parent	530	652.2	530	652.2	$ 594	$ 730.6	$ 602.3	$ 439.4
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax	(56.5)	57	(172.8)	225.8
Reclassification from AOCI, Current Period, Tax	2	1.9	7.4	3.4
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax	(7.5)	(7.1)	(27.8)	(13)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	16.8	(13.2)	53.4	(56.5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (64)	$ 49.9	$ (200.6)	$ 212.8

Stockholders_ Equity - Narrativ

Stockholders’ Equity - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	May 06, 2020	Aug. 06, 2014
Class of Stock [Line Items]
Remaining authorized repurchase amount	$ 171,600,000		$ 171,600,000		$ 333,300,000		$ 133,300,000
Repurchases of common stock	$ 3,000,000		$ 161,700,000	$ 110,400,000
Weighted-average Remaining Lease Term - Finance Leases	1 year 3 months 18 days		1 year 3 months 18 days
Weighted-average Remaining Lease Term - Operating Leases	6 years 6 months	6 years 6 months	6 years 6 months	6 years 6 months
Weighted-average Discount Rate - Finance Leases	0.60%	4.00%	0.60%	4.00%
Weighted-average Discount Rate - Operating Leases	3.30%	3.70%	3.30%	3.70%
Value of additional shares authorized to be repurchased						$ 200,000,000
Stock Repurchased and Retired During Period, Value	$ 3,000,000		$ 161,700,000	$ 110,400,000
Employee Stock Purchase Plan | Employee Stock Option
Class of Stock [Line Items]
Price per share (in dollars per share)	$ 56.77	$ 56.81	$ 56.77	$ 56.81
Employee Stock Purchase Plan | Employee Stock
Class of Stock [Line Items]
Shares issued under employee stock purchase plan (in shares)	22,000	18,000	54,000	44,000
Price per share (in dollars per share)	$ 61.74	$ 60.17	$ 61.74	$ 60.17
Compensation costs	$ 200,000	$ 200,000	$ 600,000	$ 500,000
Common Stock
Class of Stock [Line Items]
Repurchases of common stock (in shares)	100,000		2,100,000	1,600,000
Repurchases of common stock	$ 0		$ 200,000	$ 200,000
Average cost per share (in dollars per share)	$ 74.79		$ 77.58	$ 68.29
Weighted-average Remaining Lease Term - Finance Leases		1 year		1 year
Stock Repurchased and Retired During Period, Shares	40,000		2,085,000	1,617,000

Pension Benefits and Postreti_3

Pension Benefits and Postretirement Benefits Other Than Pensions - Narrative (Details) - employees	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Number of participants and beneficiaries	3,145
Percentage of Compensation, Defined Benefit Plan Employee Contribution		3.00%
Postretirement Benefits Other than Pensions
Defined Benefit Plan Disclosure [Line Items]
Number of retired employees covered	400
Number of active employees covered	500

Pension Benefits and Postreti_4

Pension Benefits and Postretirement Benefits Other Than Pensions - Pension Income (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Interest Cost on Projected Benefit Obligation	$ 1.8	$ 4.5	$ 5.3	$ 13.5
Expected Return on Plan Assets	(2.3)	(7.3)	(7)	(22)
Amortization of Net Actuarial Loss	0.7	1.6	2.2	4.6
Total Pension (Benefit) Expense	$ 0.2	$ (1.2)	$ 0.5	$ (3.9)

Pension Benefits and Postreti_5

Pension Benefits and Postretirement Benefits Other Than Pensions - Components of OPEB Benefits (Details) - Postretirement Benefits Other than Pensions - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 0.1	$ 0	$ 0.2	$ 0.1
Interest Cost on Accumulated Postretirement Benefit Obligation	0	0	0.1	0.2
Amortization of Prior Service Credit	(0.3)	(0.2)	(1)	(0.9)
Amortization of Net Gain	(0.6)	(0.4)	(1.3)	(1.4)
Total Pension (Benefit) Expense	$ (0.8)	$ (0.6)	$ (2)	$ (2)

Policyholder Contract Liabili_3

Policyholder Contract Liabilities - Policyholder Contract Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Policyholder Obligations	$ 481.8	$ 467
FHLB Funding Agreements | United Insurance Company of America | Federal Home Loan Bank of Chicago
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Policyholder Obligations	378.9	407.8
Universal Life-type Policyholder Account Balances
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Policyholder Obligations	$ 102.9	$ 59.2

Policyholder Contract Liabili_4

Policyholder Contract Liabilities - Narrative (Details) - United Insurance Company of America - Federal Home Loan Bank of Chicago $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank, amount of advances	$ 296.9
Payments of FHLBank borrowings	$ 326

Policyholder Contract Liabili_5

Policyholder Contract Liabilities - Supplemental Financial Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Policyholder Obligations	$ 481.8	$ 467
Federal Home Loan Bank of Chicago | United Insurance Company of America
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fair Value of Collateral Pledged	547.8	530.5
FHLB of Chicago Common Stock Owned at Cost	11.8	11.8
Federal Home Loan Bank of Chicago | United Insurance Company of America | FHLB Funding Agreements
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Policyholder Obligations	$ 378.9	$ 407.8

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($)	Mar. 16, 2021	Jun. 04, 2019	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Sep. 22, 2020	Jul. 05, 2019	Jul. 02, 2018	Jun. 08, 2018	Feb. 28, 2015
Debt Instrument [Line Items]
Long-term Debt				$ 1,122,100,000		$ 1,122,100,000		$ 1,172,800,000
Interest and other expenses				10,700,000	$ 8,300,000	33,000,000	$ 24,700,000
Interest paid, including capitalized interest, operating and investing activities				21,600,000	$ 16,900,000	43,700,000	$ 34,400,000
2.400% Senior Notes due September 30, 2030
Debt Instrument [Line Items]
Long-term Debt				395,800,000		395,800,000
Secured Debt
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 50,000,000
Secured Debt | Term Loan due July 5, 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 50,000,000
Long-term Debt				0		0		49,900,000		$ 49,900,000
Senior Notes
Debt Instrument [Line Items]
Long-term Debt								448,800,000
Senior Notes | 5.000% Senior Notes due September 19, 2022
Debt Instrument [Line Items]
Long-term Debt				277,100,000		277,100,000		278,300,000
Stated interest rate											5.00%
Senior Notes | 5.000% Senior Notes due September 19, 2022 | Infinity Property and Casualty Corporation
Debt Instrument [Line Items]
Face amount of debt											$ 275,000,000
Business combination, liabilities assumed, long-term debt											282,100,000
Unamortized premium											$ 7,100,000
Effective interest rate											4.36%
Senior Notes | 4.350% Senior Notes due February 15, 2025
Debt Instrument [Line Items]
Long-term Debt				$ 448,900,000		$ 448,900,000
Stated interest rate				4.35%		4.35%
Long-term debt, gross				$ 450,000,000		$ 450,000,000
Face amount of debt													$ 250,000,000
Increase in senior notes			$ 200,000,000
Senior Notes | 2.400% Senior Notes due September 30, 2030
Debt Instrument [Line Items]
Long-term Debt				396,100,000		396,100,000		$ 395,800,000
Stated interest rate									2.40%
Long-term debt, gross				400,000,000		400,000,000
Effective interest rate									2.52%
Revolving Credit Facility | Notes Payable under Revolving Credit Agreement | Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		400,000,000										$ 300,000,000
Increase in revolving credit borrowing capacity		100,000,000
Debt issuance costs		100,000
Remaining unamortized costs		$ 800,000
Line of credit facility, amount outstanding				$ 0		$ 0

Debt - Long Term Debt (Details)

Debt - Long Term Debt (Details) - USD ($) $ in Millions	Mar. 16, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 22, 2020	Jul. 05, 2019	Jun. 04, 2019	Jul. 02, 2018
Debt Instrument [Line Items]
Long-term Debt		$ 1,122.1	$ 1,172.8
2.400% Senior Notes due September 30, 2030
Debt Instrument [Line Items]
Long-term Debt		395.8
Secured Debt
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 50
Secured Debt | Term Loan due July 5, 2023
Debt Instrument [Line Items]
Long-term Debt		0	49.9		$ 49.9
Line of credit facility, maximum borrowing capacity						$ 50
Senior Notes
Debt Instrument [Line Items]
Long-term Debt			448.8
Senior Notes | 5.000% Senior Notes due September 19, 2022
Debt Instrument [Line Items]
Long-term Debt		277.1	278.3
Stated interest rate							5.00%
Senior Notes | 4.350% Senior Notes due February 15, 2025
Debt Instrument [Line Items]
Long-term Debt		$ 448.9
Stated interest rate		4.35%
Senior Notes | 2.400% Senior Notes due September 30, 2030
Debt Instrument [Line Items]
Long-term Debt		$ 396.1	$ 395.8
Stated interest rate				2.40%

Leases - Narrative (Details)

Leases - Narrative (Details)	Sep. 30, 2021
Minimum | Building
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract	1 year
Minimum | Equipment
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract	1 year
Maximum | Building
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract	15 years
Maximum | Equipment
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract	5 years

Leases - Right of Use Assets an

Leases - Right of Use Assets and Liabilities (Details) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating Lease Right-of-Use Assets	$ 73.3	$ 68.6
Operating Lease Liabilities	$ 97.9	$ 89.6

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lease Cost
Amortization of Right-of-Use Assets - Finance Leases	$ 0.1	$ 0	$ 0.2	$ 0.2
Operating Lease Cost	5.8	5.1	16.8	15.9
Variable Lease, Cost	0		0.1
Short-Term Lease Cost	0.8	0	2.4	0
Total Lease Expense	6.7	5.1	19.5	16.1
Less: Sublease Income	0.2	0	0.2
Lease, Cost	$ 6.5	$ 5.1	$ 19.3	$ 16.1

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021
Leases [Abstract]
Operating Cash Flows from Operating Lease (Fixed Payments)	$ 14.8	$ 17.5
Operating Cash Flows from Operating Lease (Liability Reduction)	14	15.6
Financing Cash Flows from Finance Leases	0.2	0.2
Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities	$ 8.2	$ 19.4

Leases - Lease Weighted Average

Leases - Lease Weighted Average (Details)	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Weighted-average Remaining Lease Term - Finance Leases	1 year 3 months 18 days
Weighted-average Remaining Lease Term - Operating Leases	6 years 6 months	6 years 6 months
Weighted-average Discount Rate - Finance Leases	0.60%	4.00%
Weighted-average Discount Rate - Operating Leases	3.30%	3.70%

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments Under Finance and Operating Leases (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Remainder of 2021	$ 6.3
2022	24.1
2023	21.2
2024	15.4
2025	10.3
2026 and Thereafter	34.4
Total Future Payments	111.7
Less Imputed Interest	13.8
Present Value of Minimum Lease Payments	$ 97.9	$ 89.6

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Unrecognized tax benefits		$ 0
Income taxes paid, net	$ 55,200,000	$ 38,000,000