Kemper (KMPR) 10-Q 29 Apr 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	3 Months Ended
	Mar. 31, 2019	Apr. 22, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	KEMPER Corporation
Trading Symbol	KMPR
Entity Central Index Key	0000860748
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding at July 31, 2017		64,930,663

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 155.3	$ 53.8
Other Comprehensive Income (Loss) Before Income Taxes:
Unrealized Holding Gains (Losses)	162.8	(121.4)
Foreign Currency Translation Adjustments	0	(0.9)
Decrease in Net Unrecognized Postretirement Benefit Costs	0.6	0.3
Gain on Cash Flow Hedges	0.1	0.9
Other Comprehensive Income (Loss) Before Income Taxes	163.5	(121.1)
Other Comprehensive Income Tax Benefit (Expense)	(34.4)	25.4
Other Comprehensive Income (Loss)	129.1	(95.7)
Total Comprehensive Income (Loss)	$ 284.4	$ (41.9)

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Earned Premiums	$ 1,074.8	$ 609.8
Net Investment Income	82.7	79.2
Other Income	1.9	1.2
Income from Change in Fair Value of Equity and Convertible Securities	64.4	0.7
Net Realized Gains on Sales of Investments	16.1	2.6
Other-than-temporary Impairment Losses:
Total Other-than-temporary Impairment Losses	(3.5)	(0.5)
Portion of Losses Recognized in Other Comprehensive Income	(0.1)	0
Net Impairment Losses Recognized in Earnings	(3.6)	(0.5)
Total Revenues	1,236.3	693
Expenses:
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses	765.4	436.9
Insurance Expenses	234.8	160.1
Interest and Other Expenses	41.4	29
Total Expenses	1,041.6	626
Income from Continuing Operations before Income Taxes	194.7	67
Income Tax Expense	(39.4)	(13.4)
Income from Continuing Operations	155.3	53.6
Income from Discontinued Operations	0	0.2
Net Income	$ 155.3	$ 53.8
Income from Continuing Operations Per Unrestricted Share:
Basic (in dollars per share)	$ 2.38	$ 1.03
Diluted (in dollars per share)	2.35	1.02
Net Income Per Unrestricted Share:
Basic (in dollars per share)	2.38	1.03
Diluted (in dollars per share)	$ 2.35	$ 1.02

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Investments:
Fixed Maturities at Fair Value (Amortized Cost: 2019 - $6,266.9; 2018 - $6,284.5)	$ 6,573.1	$ 6,424.2
Equity Securities at Fair Value	916.9	684.4
Equity Securities at Modified Cost	39.2	41.5
Equity Method Limited Liability Investments at Cost Plus Cumulative Undistributed Earnings	197.8	187
Convertible Securities at Fair Value	33.8	31.5
Short-term Investments at Cost which Approximates Fair Value	350.4	286.1
Other Investments	425.6	414.8
Total Investments	8,536.8	8,069.5
Cash	107	75.1
Receivables from Policyholders	1,048.6	1,007.1
Other Receivables	254.6	245.4
Deferred Policy Acquisition Costs	499.2	470
Goodwill	1,111.5	1,112.4
Current Income Tax Assets	19.7	38.9
Other Assets	604.8	526.5
Total Assets	12,182.2	11,544.9
Insurance Reserves:
Life and Health	3,568.5	3,558.7
Property and Casualty	1,868.7	1,874.9
Total Insurance Reserves	5,437.2	5,433.6
Unearned Premiums	1,499.5	1,424.3
Deferred Income Tax Liabilities	82.6	26.2
Liabilities for Unrecognized Tax Benefits	3.9	4.4
Collateralized Investment Borrowings at Cost (Fair Value: 2019 - $187.7; 2018 - $10.0)	187.7	10
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2019 - $933.8; 2018 - $911.2)	908.5	909
Accrued Expenses and Other Liabilities	742.7	687.3
Total Liabilities	8,862.1	8,494.8
Shareholders’ Equity:
Common Stock, $0.10 Par Value, 100 Million Shares Authorized; 64,930,663 Shares Issued and Outstanding at March 31, 2019 and 64,756,833 Shares Issued and Outstanding at December 31, 2018	6.5	6.5
Paid-in Capital	1,673	1,666.3
Retained Earnings	1,489.7	1,355.5
Accumulated Other Comprehensive Income	150.9	21.8
Total Shareholders’ Equity	3,320.1	3,050.1
Total Liabilities and Shareholders’ Equity	$ 12,182.2	$ 11,544.9

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost of Fixed Maturity Securities	$ 6,266.9	$ 6,284.5
Long-term Debt, Fair Value	$ 933.8	$ 911.2
Common Stock, Par Value (usd per share)	$ 0.1	$ 0.1
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares Issued	64,930,663	64,756,833
Common Stock, Shares, Outstanding	64,930,663	64,756,833
Federal Home Loan Bank of Chicago [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 187.7	$ 10

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net Income	$ 155.3	$ 53.8
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangible Assets Acquired	8.7	0.3
Equity in Earnings of Equity Method Limited Liability Investments	(3.6)	(7.1)
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments	4.3	1.1
Increase in Value of Equity and Convertible Securities at Fair Value	(64.4)	(0.7)
Amortization of Investment Securities and Depreciation of Investment Real Estate	1.6	2.3
Net Realized Gains on Sales of Investments	(16.1)	(2.6)
Net Impairment Losses Recognized in Earnings	3.6	0.5
Depreciation of Property and Equipment	3.1	5
Increase in Receivables	(56.1)	(14.5)
Increase in Deferred Policy Acquisition Costs	(29.2)	(12.7)
Increase in Insurance Reserves	3.8	2.1
Increase in Unearned Premiums	75.2	36.3
Change in Income Taxes	40.1	18.1
Change in Accrued Expenses and Other Liabilities	(42.4)	(13.5)
Other, Net	5.1	5.6
Net Cash Provided by Operating Activities	89	74
Investing Activities:
Sales, Paydowns and Maturities of Fixed Maturities	402.6	397.8
Purchases of Fixed Maturities	(368.4)	(408.6)
Sales of Equity and Convertible Securities	39.6	32.4
Purchases of Equity and Convertible Securities	(207.6)	(51.1)
Sale of and Return of Investment of Equity Method Limited Liability Investments	7.1	1.6
Acquisitions of Equity Method Limited Liability Investments	(18.6)	(3.5)
Decrease (Increase) in Short-term Investments	(53.3)	47.2
Improvements of Investment Real Estate	(0.4)	(0.7)
Increase (Decrease) in Other Investments	(10.6)	2.1
Acquisition and Development of Software	(9.3)	(22.1)
Other, Net	(0.8)	2.9
Net Cash Used by Investing Activities	(219.7)	(2)
Financing Activities:
Dividends and Dividend Equivalents Paid	(16.4)	(12.5)
Proceeds from Advances from FHLB	187.7	10
Repayments of Debt, Maturing in More than Three Months	(10)	0
Cash Exercise of Stock Options	1.3	0.6
Other, Net	0	(0.4)
Net Cash Provided (Used) by Financing Activities	162.6	(2.3)
Increase in Cash	31.9	69.7
Cash, Beginning of Year	75.1	45.7
Cash, End of Period	$ 107	$ 115.4

Consolidated Statements of Shar

Consolidated Statements of Shareholders’ Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Beginning Balance, shares at Dec. 31, 2017		51.5
Beginning balance at Dec. 31, 2017	$ 2,115.6	$ 5.1	$ 673.1	$ 1,243	$ 194.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	53.8			53.8
Other Comprehensive Income	(95.7)				(95.7)
Cash Dividends to Shareholders	(12.5)			(12.5)
Equity-based Compensation Cost	3.4		3.4
Equity-based Awards, Net of Shares Exchanged	(0.8)		0.4	(1.2)
Ending Balance, shares at Mar. 31, 2018		51.5
Ending balance at Mar. 31, 2018	2,063.8	$ 5.1	676.9	1,264.9	116.9
Beginning Balance, shares at Dec. 31, 2018		64.7
Beginning balance at Dec. 31, 2018	3,050.1	$ 6.5	1,666.3	1,355.5	21.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	155.3			155.3
Other Comprehensive Income	129.1				129.1
Cash Dividends to Shareholders	(16.4)			(16.4)
Equity-based Compensation Cost	7.6		7.6
Equity-based Awards, Net of Shares Exchanged, shares		0.2
Equity-based Awards, Net of Shares Exchanged	(5.6)		(0.9)	(4.7)
Ending Balance, shares at Mar. 31, 2019		64.9
Ending balance at Mar. 31, 2019	$ 3,320.1	$ 6.5	$ 1,673	$ 1,489.7	$ 150.9

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Note 1 - Basis of Presentation The Condensed Consolidated Financial Statements included herein have been prepared pursuant to the rules and regulations of the SEC and include the accounts of Kemper Corporation and its subsidiaries and are unaudited. All significant intercompany accounts and transactions have been eliminated. Certain financial information that is normally included in annual financial statements, including certain financial statement footnote disclosures, prepared in accordance with accounting principles generally accepted in the United States of America (“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 for a fair presentation. The preparation of interim financial statements relies heavily on estimates. This factor and other factors, such as the seasonal nature of some portions of the insurance business, as well as market conditions, call for caution in drawing specific conclusions from interim results. The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the Company’s Consolidated Financial Statements and related notes included in the 2018 Annual Report. Adoption of New Accounting Guidance Guidance Adopted in 2019 Effective January 1, 2019, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-02, Leases—(Topic 842). ASU 2016-02 introduced a lessee model that requires the recognition of a right-of-use (“ROU”) asset and a lease liability for all leases with terms greater than twelve months. The Company adopted ASC 842 using the modified retrospective method at the beginning of the period of the adoption and elected the permitted practical expedients to not reassess whether any expired or existing contracts contain leases, the lease classification for any expired or existing leases and initial direct costs for any existing leases. The adoption of ASU 2016-02 had no impact on the Company’s Shareholders’ Equity as of January 1, 2019, but resulted in the establishment of a ROU asset of $78.0 million , a lease liability of $82.5 million and an adjustment to deferred rent liability of $4.5 million . The ROU Asset and related liabilities were reflected in Other Assets and Accrued Expenses and Other Liabilities, respectively, on the Condensed Consolidated Balance Sheets as of March 31, 2019 . In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Derivatives and Hedging Activities. ASU 2017-12 aligns an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The amendments in ASU 2017-12 expand and refine hedge accounting for both nonfinancial and financial risk components and align the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. Furthermore, the amendments make certain targeted improvements to simplify the application of hedge accounting guidance and ease the administration of hedge documentation requirements and assessing hedge effectiveness. ASU 2017-12 is effective for annual periods beginning after December 15, 2018 and interim periods within those annual periods with early adoption permitted. The impact of adoption of ASU 2017-12 on the Company’s consolidated financial position was not material. Guidance Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 replaces the incurred loss impairment methodology in current GAAP with a methodology that utilizes expected credit losses to provide for an allowance for credit losses for financial instruments and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The amendments in this ASU require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The income statement includes the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. Credit losses on available-for-sale debt securities are measured in a manner similar to current GAAP, although the ASU requires that they be presented as an allowance rather than as a write-down. In situations where the estimate of credit loss on an available-for-sale debt security declines, entities will be able to record the reversal to income in the current period, which GAAP currently prohibits. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods within those annual periods with early adoption permitted for fiscal years beginning after December 31, 2018 and interim periods within such year. The Company is currently evaluating the impact of this guidance on its financial statements. Note 1 - Basis of Presentation (continued) 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. ASU 2018-12 is effective for fiscal years beginning after December 15, 2020, including interim periods therein. The amendments in ASU 2018-12 are intended to improve measurement of the liability for future policy benefits related to nonparticipating traditional and limited-payment contracts, measurement and presentation of market risk benefits, amortization of deferred acquisition costs, and enhance presentation and disclosures. The Company is currently evaluating the impact of this guidance on its financial statements. The Company has adopted all other recently issued accounting pronouncements with effective dates prior to January 1, 2019. Other than the adoption of ASU 2016-02, 2016-02, Leases—(Topic 842) there were no adoptions of such accounting pronouncements during the three months ended March 31, 2019 that had a material impact on the Company’s Condensed Consolidated Financial Statements. With the possible exceptions of ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and ASU 2018-12, Financial Services—Insurance (Topic 944):Targeted Improvements to Accounting for Long-Duration Contracts , the Company does not expect the adoption of recently issued accounting pronouncements with effective dates after March 31, 2019

Acquisition of Business (Notes)

Acquisition of Business (Notes)	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Subsequent Event- Acquisition of Infinity	On July 2, 2018, Kemper acquired 100% of the outstanding common stock of Infinity Property and Casualty Corporation (“Infinity”), pursuant to the terms of the merger agreement dated February 13, 2018. The Company has not yet completed the process of estimating the fair value of assets acquired and liabilities assumed, including, but not limited to, receivables, intangible assets, unearned premium reserves, certain tax-related balances and certain other asset and 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 as a result of events or conditions as of the acquisition date, will be reported in the Company’s financial statements as an adjustment to the assets acquired and liabilities assumed. During the first quarter of 2019, the Company further refined its estimate of certain bonus accruals, other liabilities and related tax-related balances, decreasing liabilities assumed by $0.9 million and decreasing goodwill by $0.9 million . The Company has allocated all of the goodwill associated with the Infinity acquisition to the Specialty Property & Casualty Insurance segment. 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. Based on the Company’s preliminary allocation of the purchase price as of March 31, 2019 , the fair value of the assets acquired and liabilities assumed were: (Dollars in Millions) Investments $ 1,569.3 Short Term Investments 98.8 Cash 4.0 Receivables from Policyholders 583.4 Other Receivables 31.7 Value of Intangible Assets Acquired (Reported in Other Assets) 262.7 Current Income Tax Assets 0.8 Goodwill 1 788.5 Other Assets 102.1 Property and Casualty Insurance Reserves (713.6 ) Unearned Premiums (715.6 ) Debt (282.1 ) Deferred Income Tax Liabilities (11.7 ) Accrued Expenses and Other Liabilities (169.6 ) Total Purchase Price 1,548.7 1

Investments

Investments	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investments	Note 3 - Investments Fixed Maturities The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at March 31, 2019 were: Amortized Cost Gross Unrealized Fair Value (Dollars in Millions) Gains Losses U.S. Government and Government Agencies and Authorities $ 845.9 $ 20.2 $ (7.7 ) $ 858.4 States and Political Subdivisions 1,582.2 101.4 (1.7 ) 1,681.9 Foreign Governments 5.8 — (0.6 ) 5.2 Corporate Securities: Bonds and Notes 3,281.5 216.4 (17.8 ) 3,480.1 Collateralized Loan Obligations 536.8 1.5 (6.8 ) 531.5 Other Mortgage- and Asset-backed 14.7 1.3 — 16.0 Investments in Fixed Maturities $ 6,266.9 $ 340.8 $ (34.6 ) $ 6,573.1 The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2018 were: Amortized Cost Gross Unrealized Fair Value (Dollars in Millions) Gains Losses U.S. Government and Government Agencies and Authorities $ 865.9 $ 14.8 $ (15.0 ) $ 865.7 States and Political Subdivisions 1,553.7 74.0 (8.6 ) 1,619.1 Foreign Governments 6.5 — (0.6 ) 5.9 Corporate Securities: Bonds and Notes 3,307.8 135.1 (49.1 ) 3,393.8 Collateralized Loan Obligations 535.7 1.5 (13.2 ) 524.0 Other Mortgage- and Asset-backed 14.9 0.9 (0.1 ) 15.7 Investments in Fixed Maturities $ 6,284.5 $ 226.3 $ (86.6 ) $ 6,424.2 Accrued Expenses and Other Liabilities included unsettled purchases of Investments in Fixed Maturities of $15.5 million and $10.5 million at March 31, 2019 and December 31, 2018 , respectively. Note 3 - Investments (continued) The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at March 31, 2019 by contractual maturity were: (Dollars in Millions) Amortized Cost Fair Value Due in One Year or Less $ 90.1 $ 90.9 Due after One Year to Five Years 905.9 921.6 Due after Five Years to Ten Years 1,658.4 1,731.8 Due after Ten Years 2,434.4 2,649.2 Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,178.1 1,179.6 Investments in Fixed Maturities $ 6,266.9 $ 6,573.1 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 March 31, 2019 consisted of securities issued by the Government National Mortgage Association with a fair value of $616.4 million , securities issued by the Federal National Mortgage Association with a fair value of $8.1 million , securities issued by the Federal Home Loan Mortgage Corporation with a fair value of $7.6 million and securities of other non-governmental issuers with a fair value of $547.5 million . An aging of unrealized losses on the Company’s Investments in Fixed Maturities at March 31, 2019 is presented below. Less Than 12 Months 12 Months or Longer Total (Dollars in Millions) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 13.2 $ (0.2 ) $ 262.2 $ (7.5 ) $ 275.4 $ (7.7 ) States and Political Subdivisions 1.6 (0.3 ) 77.8 (1.4 ) 79.4 (1.7 ) Foreign Governments 4.4 (0.5 ) 0.5 (0.1 ) 4.9 (0.6 ) Corporate Securities: Bonds and Notes 222.6 (5.2 ) 321.4 (12.6 ) 544.0 (17.8 ) Collateralized Loan Obligations 406.6 (6.0 ) 28.7 (0.8 ) 435.3 (6.8 ) Other Mortgage- and Asset-backed — — 4.6 — 4.6 — Total Fixed Maturities 648.4 (12.2 ) 695.2 (22.4 ) 1,343.6 (34.6 ) The Company regularly reviews its fixed maturity investment portfolio for factors that may indicate that a decline in fair value of an investment is other than temporary. The portions of the declines in the fair values of fixed maturity investments that are determined to be other than temporary are reported as losses in the Condensed Consolidated Statements of Income in the periods when such determinations are made. Unrealized losses on fixed maturities, which the Company has determined to be temporary at March 31, 2019 , were $34.6 million , of which $22.4 million was related to fixed maturities that were in an unrealized loss position for 12 months or longer. There were no unrealized losses at March 31, 2019 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “Less Than 12 Months.” There were no unrealized losses at March 31, 2019 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “12 Months or Longer.” Investment-grade fixed maturity investments comprised $23.1 million and below-investment-grade fixed maturity investments comprised $11.5 million of the unrealized losses on investments in fixed maturities at March 31, 2019 . For below-investment-grade fixed maturity investments in an unrealized loss position, the unrealized loss amount, on average, was approximately 4% of the amortized cost basis of the investment. At March 31, 2019 , 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 it recovered the amortized cost of such investments, which may be at maturity. Based on the Company’s Note 3 - Investments (continued) evaluation of the prospects of the issuers at March 31, 2019 , including, but not limited to, the credit ratings of the issuers of the investments in the fixed maturities, and the Company’s intention to not sell and its determination that it would not be required to sell before it recovered the amortized cost of such investments, the Company concluded that the declines in the fair values of the Company’s investments in fixed maturities presented in the preceding table were temporary at the evaluation date. An aging of unrealized losses on the Company’s Investments in Fixed Maturities at December 31, 2018 is presented below. Less Than 12 Months 12 Months or Longer Total (Dollars in Millions) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 401.1 $ (7.6 ) $ 79.0 $ (7.4 ) $ 480.1 $ (15.0 ) States and Political Subdivisions 299.4 (5.0 ) 102.6 (3.6 ) 402.0 (8.6 ) Foreign Governments 4.9 (0.6 ) — — 4.9 (0.6 ) Corporate Securities: Bonds and Notes 1,326.0 (38.2 ) 116.8 (10.9 ) 1,442.8 (49.1 ) Collateralized Loan Obligations 439.2 (13.2 ) — — 439.2 (13.2 ) Other Mortgage- and Asset-backed 0.2 — 4.5 (0.1 ) 4.7 (0.1 ) Total Fixed Maturities 2,470.8 (64.6 ) 302.9 (22.0 ) 2,773.7 (86.6 ) Unrealized losses on fixed maturities, which the Company determined to be temporary at December 31, 2018 , were $86.6 million , of which $22.0 million was related to fixed maturities that were in an unrealized loss position for 12 months or longer. There were no unrealized losses at December 31, 2018 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “Less Than 12 Months.” There were no unrealized losses at December 31, 2018 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “12 Months or Longer.” Investment-grade fixed maturity investments comprised $69.5 million and below-investment-grade fixed maturity investments comprised $17.1 million of the unrealized losses on investments in fixed maturities at December 31, 2018 . 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. At December 31, 2018 , 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 recovery of its amortized cost basis, which may be at maturity. Based on the Company’s evaluation at December 31, 2018 of the prospects of the issuers, including, but not limited to, the credit ratings of the issuers of the investments in the fixed maturities, and the Company’s intention to not sell and its determination that it would not be required to sell before recovery of the amortized cost of such investments, the Company concluded that the declines in the fair values of the Company’s investments in fixed maturities presented in the preceding table were temporary at the evaluation date. The following table sets forth the pre-tax amount of other than temporary impairment (“OTTI”) credit losses recognized in Retained Earnings for Investments in Fixed Maturities held by the Company as of the beginning and end of the periods presented for which a portion of the OTTI loss related to factors other than credit has been recognized in AOCI, and the corresponding changes in such amounts. Note 3 - Investments (continued) Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at Beginning of Period $ 1.1 $ 1.6 Pre-tax Credit Losses on Fixed Maturities without Pre-tax Credit Losses Included in Cumulative Balance at Beginning of Period 0.1 — Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at End of Period $ 1.2 $ 1.6 Equity Securities Investments in Equity Securities at Fair Value were $916.9 million and $684.4 million at March 31, 2019 and December 31, 2018 , respectively. Net unrealized gains arising during the three months ended March 31, 2019 and recognized in earnings, related to such investments still held as of March 31, 2019 , were $63.4 million . For Equity Securities at Modified Cost, 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 other-than-temporary 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 or decreases in the carrying value due to observable transactions. The Company recognized an impairment of $0.2 million on Equity Securities at Modified Cost in other comprehensive income for the three months ended March 31, 2019 as a result of the Company’s qualitative impairment analysis. The Company has recognized no cumulative increases in the carrying value due to observable transactions, no cumulative decreases in the carrying value due to observable transactions and $5.1 million of cumulative impairments on Equity Securities at Modified Cost held as of March 31, 2019 . There were no unsettled sales of Investments in Equity Securities at March 31, 2019 and December 31, 2018 . There were no unsettled purchases of Investments in Equity Securities at March 31, 2019 and December 31, 2018 . 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 March 31, 2019 is limited to the total carrying value of $197.8 million . In addition, the Company had outstanding commitments totaling approximately $105.2 million to fund Equity Method Limited Liability Investments at March 31, 2019 . Other Investments The carrying values of the Company’s Other Investments at March 31, 2019 and December 31, 2018 were: (Dollars in Millions) Mar 31, Dec 31, Loans to Policyholders at Unpaid Principal $ 301.4 $ 300.6 Real Estate at Depreciated Cost 113.6 114.2 Mortgage Loans 10.6 — Total $ 425.6 $ 414.8 Note 3 - Investments (continued) Net Investment Income Net Investment Income for the three months ended March 31, 2019 and 2018 was: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Investment Income: Interest on Fixed Income Securities $ 76.4 $ 62.4 Dividends on Equity Securities Excluding Alternative Investments 2.5 1.9 Alternative Investments: Equity Method Limited Liability Investments (3.6 ) 7.1 Limited Liability Investments Included in Equity Securities 2.6 3.9 Total Alternative Investments (1.0 ) 11.0 Short-term Investments 1.8 0.8 Loans to Policyholders 5.3 5.5 Real Estate 2.5 2.4 Total Investment Income 87.5 84.0 Investment Expenses: Real Estate 2.4 2.3 Other Investment Expenses 2.4 2.5 Total Investment Expenses 4.8 4.8 Net Investment Income $ 82.7 $ 79.2 Gross gains and losses on sales of investments in fixed maturities for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Fixed Maturities: Gains on Sales $ 15.1 $ 4.1 Losses on Sales (2.6 ) (2.1 )

Property and Casualty Insurance

Property and Casualty Insurance Reserves	3 Months Ended
	Mar. 31, 2019
Subsequent Event Disclosure Text Block Supplement [Abstract]
Property and Casualty Insurance Reserves	Note 4 - Property and Casualty Insurance Reserves Property and casualty insurance reserve activity for the three months ended March 31, 2019 and 2018 was: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Property and Casualty Insurance Reserves: Gross of Reinsurance and Indemnification at Beginning of Year $ 1,874.9 $ 1,016.8 Less Reinsurance and Indemnification Recoverables at Beginning of Year 101.9 53.1 Property and Casualty Insurance Reserves - Net of Reinsurance at Beginning of Year 1,773.0 963.7 Incurred Losses and LAE Related to: Current Year: Continuing Operations 687.6 339.3 Prior Years: Continuing Operations (21.4 ) (1.0 ) Discontinued Operations — (0.3 ) Total Incurred Losses and LAE Related to Prior Years (21.4 ) (1.3 ) Total Incurred Losses and LAE 666.2 338.0 Paid Losses and LAE Related to: Current Year: Continuing Operations 223.5 125.3 Prior Years: Continuing Operations 444.5 222.2 Discontinued Operations 0.9 0.7 Total Paid Losses and LAE Related to Prior Years 445.4 222.9 Total Paid Losses and LAE 668.9 348.2 Property and Casualty Insurance Reserves - Net of Reinsurance at End of Period 1,770.3 953.5 Plus Reinsurance Recoverables at End of Period 98.4 51.6 Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period $ 1,868.7 $ 1,005.1 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 three months ended March 31, 2019 , the Company decreased its property and casualty insurance reserves by $21.4 million to recognize favorable development of loss and LAE reserves from prior accident years. Preferred Personal automobile insurance loss and LAE reserves developed favorably by $1.3 million due primarily to the emergence of favorable loss patterns for liability insurance related to 2018 and 2017 accident years. Other personal lines loss and LAE reserves developed favorably by $1.8 million due primarily to the emergence of more favorable loss patterns than expected for the 2017, 2016 and 2015 accident years. Specialty Personal automobile insurance loss and LAE reserves developed favorably by $14.3 million due primarily to the emergence of favorable loss patterns for liability insurance related to the 2018 accident year and, to a lesser extent the 2016 and 2015 accident years. Commercial automobile insurance loss and LAE reserves developed favorably by $3.8 million due primarily to the emergence of favorable loss patterns for liability insurance related to the 2018 accident year. Note 4 - Property and Casualty Insurance Reserves (continued) For the three months ended March 31, 2018 , the Company decreased its property and casualty insurance reserves by $1.3 million to recognize favorable development of loss and LAE reserves from prior accident years. Preferred Personal automobile insurance loss and LAE reserves developed adversely by $0.5 million due primarily to the emergence of loss patterns that were worse than expected for liability insurance for the 2016 and prior accident years, partially offset by the emergence of more favorable loss patterns than expected for both physical damage and liability insurance lines for the 2017 accident year. Homeowners insurance non-catastrophe loss and LAE reserves developed adversely by $5.6 million due primarily to the emergence of loss patterns that were worse than expected for the 2017 and 2016 accident years, partially offset by favorable development on catastrophes of $5.1 million related to the 2017 accident year. Other personal lines loss and LAE reserves developed favorably by $1.2 million due primarily to the emergence of more favorable loss patterns than expected for the 2016 and 2015 accident years. Commercial automobile loss and LAE reserves developed favorably by $0.7 million due primarily to the emergence of loss patterns that were more favorable than expected for the 2014 accident year and, to a lesser extent, the 2017 and 2016 accident years.

Debt

Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Debt	Note 5 - Debt Amended and Extended Credit Agreement and Term Loan Facility On June 29, 2018 , the Company borrowed $250.0 million under the delayed draw term loan facility to facilitate the funding of the acquisition of Infinity. The proceeds from the term loan facility, net of debt issuance costs, were $249.4 million . On December 28, 2018, the Company repaid $215.0 million of the outstanding term loan facility. There were no outstanding borrowings at March 31, 2019 and December 31, 2018 under the revolving credit agreement. Infinity Debt Infinity’s liabilities at the acquisition date included $275.0 million principal amount, 5.0% 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, 2018 Kemper executed a guarantee to fully and unconditionally guarantee the payment and performance obligations of the 2022 Senior Notes. Note 5 - 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 March 31, 2019 and December 31, 2018 was: (Dollars in Millions) Mar 31, Dec 31, Term Loan due June 29, 2020 $ 34.9 $ 34.9 5.0% Senior Notes due September 19, 2022 281.0 281.5 4.35% Senior Notes due February 15, 2025 448.4 448.4 7.375% Subordinated Debentures due February 27, 2054 144.2 144.2 Total Long-term Debt Outstanding $ 908.5 $ 909.0 Collateralized Investment Borrowings Kemper’s subsidiaries, United Insurance Company of America (“United Insurance”) and Trinity Universal Insurance Company (“Trinity”), are members of the Federal Home Loan Bank (“FHLB”) of Chicago and Dallas, respectively. As a requirement of membership in the FHLB, United Insurance and Trinity maintain a certain level of investment in FHLB stock and additional amounts based on the level of outstanding borrowings. The Company’s investments in FHLB common stock are reported at cost and included in Equity Securities at Modified Cost. The carrying value of FHLB of Chicago common stock was $3.8 million and $0.8 million at March 31, 2019 and December 31, 2018 , respectively. The carrying value of FHLB of Dallas common stock was $3.3 million at March 31, 2019 and December 31, 2018 . In March of 2018, United Insurance received advances of $10.0 million from the FHLB of Chicago. These advances, made in connection with the start-up of the Company’s collateralized investment borrowings program, were collateralized by U.S Government Agency securities held in a custodial account with the FHLB of Chicago with a fair value of $15.7 million at December 31, 2018. These advances were repaid in March of 2019. In March of 2019, United Insurance received advances of $187.7 million from the FHLB of Chicago. These advances were made in connection with the Company’s collateralized investment borrowings program. The proceeds related to these advances were used to purchase fixed maturity securities to earn incremental net investment income. With respect to these advances, United Insurance held pledged municipal securities in a custodial account with the FHLB of Chicago with a fair value of $198.0 million as of March 31, 2019 . 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. Note 5 - Debt (continued) The following summarizes the terms of the Company’s Collateralized Investment Borrowings at March 31, 2019 : (Dollars in Millions) Principal Borrowings Weighted-average Interest Rate Due in One Year or Less $ 93.1 2.61 % Due after One Year to Two Years 92.0 2.73 % Due after Two Years to Three Years 2.6 2.71 % $ 187.7 Interest Expense and Interest Paid Interest Expense, including facility fees, accretion of discount, amortization of premium and amortization of issuance costs, was $11.5 million for the three months ended March 31, 2019 . Interest paid, including facility fees, was $19.8 million for the three months ended March 31, 2019 , respectively. Interest Expense, including facility fees, accretion of discount and amortization of issuance costs, was $8.0 million for the three months ended March 31, 2018 . Interest paid, including facility fees, was $12.5 million for the three months ended March 31, 2018

Leases (Notes)

Leases (Notes)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Lessee, Finance Leases [Text Block]	Leases The Company leases certain office space under non-cancelable operating leases, with initial terms typically ranging from one to 10 years , along with options that permit renewals for additional periods. The Company also leases certain equipment under non-cancelable operating leases, with initial terms typically ranging from one to five years . Minimum rent is expensed on a straight-line basis over the term of the lease. See Note 1 - Adoption of New Accounting Guidance - New Guidance Adopted in 2019 for additional information regarding the accounting for leases. Lease expenses are primarily included in insurance expenses in the condensed consolidated statement of income. Additional information regarding the Company’s operating leases is presented below. (Dollars in Millions) Three Months Ended Mar 31, 2019 Lease Cost: Amortization of Right-of-Use Assets $ 0.2 Operating Lease Cost 5.7 Short-Term Lease Cost (1) 0.1 Total Expense 6.0 Less: Sublease Income (2) (0.1 ) Total Lease Cost $ 5.9 (1) - Leases with an initial term of twelve months or less are not recorded on the balance sheet. (2) - Sublease income consists of rent from third parties of office space and is recognized as part of other income in the Condensed Consolidated Statements of Income. Note 6 - Leases (continued) Other Information on Operating Leases Supplemental cash flow information related to the Company’s operating leases for the three months ended March 31, 2019 is as follows: (Dollars in Millions) Operating Cash Flows from Operating Lease (Fixed Payments) $ 5.2 Operating Cash Flows from Operating Lease (Liability Reduction) 4.7 Financing Cash Flows from Finance Leases 0.2 Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities 9.1 Significant judgments and assumptions for determining lease asset and liability at March 31, 2019 are presented below. Weighted-average Remaining Lease Term - Finance Leases 1.9 years Weighted-average Remaining Lease Term - Operating Leases 6.8 years Weighted-average Discount Rate - Finance Leases 4.0 % Weighted-average Discount Rate - Operating Leases 4.0 % 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 capital and operating leases at December 31, 2018 are presented below. (Dollars in Millions) Capital Operating 2019 $ 0.7 $ 20.5 2020 0.7 18.4 2021 0.3 16.9 2022 0.2 15.0 2023 — 12.5 2024 and Thereafter — 27.1 Total Future Payments $ 1.9 $ 110.4 Less Imputed Interest — Present Value of Minimum Capital Lease Payments $ 1.9
Lessee, Operating Leases [Text Block]	Leases The Company leases certain office space under non-cancelable operating leases, with initial terms typically ranging from one to 10 years , along with options that permit renewals for additional periods. The Company also leases certain equipment under non-cancelable operating leases, with initial terms typically ranging from one to five years . Minimum rent is expensed on a straight-line basis over the term of the lease. See Note 1 - Adoption of New Accounting Guidance - New Guidance Adopted in 2019 for additional information regarding the accounting for leases. Lease expenses are primarily included in insurance expenses in the condensed consolidated statement of income. Additional information regarding the Company’s operating leases is presented below. (Dollars in Millions) Three Months Ended Mar 31, 2019 Lease Cost: Amortization of Right-of-Use Assets $ 0.2 Operating Lease Cost 5.7 Short-Term Lease Cost (1) 0.1 Total Expense 6.0 Less: Sublease Income (2) (0.1 ) Total Lease Cost $ 5.9 (1) - Leases with an initial term of twelve months or less are not recorded on the balance sheet. (2) - Sublease income consists of rent from third parties of office space and is recognized as part of other income in the Condensed Consolidated Statements of Income. Note 6 - Leases (continued) Other Information on Operating Leases Supplemental cash flow information related to the Company’s operating leases for the three months ended March 31, 2019 is as follows: (Dollars in Millions) Operating Cash Flows from Operating Lease (Fixed Payments) $ 5.2 Operating Cash Flows from Operating Lease (Liability Reduction) 4.7 Financing Cash Flows from Finance Leases 0.2 Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities 9.1 Significant judgments and assumptions for determining lease asset and liability at March 31, 2019 are presented below. Weighted-average Remaining Lease Term - Finance Leases 1.9 years Weighted-average Remaining Lease Term - Operating Leases 6.8 years Weighted-average Discount Rate - Finance Leases 4.0 % Weighted-average Discount Rate - Operating Leases 4.0 % 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 capital and operating leases at December 31, 2018 are presented below. (Dollars in Millions) Capital Operating 2019 $ 0.7 $ 20.5 2020 0.7 18.4 2021 0.3 16.9 2022 0.2 15.0 2023 — 12.5 2024 and Thereafter — 27.1 Total Future Payments $ 1.9 $ 110.4 Less Imputed Interest — Present Value of Minimum Capital Lease Payments $ 1.9

Income from Continuing Operatio

Income from Continuing Operations Per Unrestricted Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations Per Unrestricted Share	Note 7 - Income from Continuing Operations Per Unrestricted Share The Company’s awards of deferred stock units contain rights to receive non-forfeitable dividend equivalents and participate in the undistributed earnings with common shareholders, as did the Company’s awards of restricted stock units and performance share units prior to 2018. 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 Income from Continuing Operations Per Unrestricted Share and Diluted Income from Continuing Operations Per Unrestricted Share for the three months ended March 31, 2019 and 2018 is presented below. Three Months Ended Mar 31, Mar 31, (Dollars in Millions) Income from Continuing Operations $ 155.3 $ 53.6 Less Income from Continuing Operations Attributed to Participating Awards 0.7 0.5 Income from Continuing Operations Attributed to Unrestricted Shares 154.6 53.1 Diluted Income from Continuing Operations Attributed to Unrestricted Shares $ 154.6 $ 53.1 (Number of Shares in Thousands) Weighted-average Unrestricted Shares Outstanding 64,815.0 51,502.9 Equity-based Compensation Equivalent Shares 791.0 365.3 Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 65,606.0 51,868.2 (Per Unrestricted Share in Whole Dollars) Basic Income from Continuing Operations Per Unrestricted Share $ 2.38 $ 1.03 Diluted Income from Continuing Operations Per Unrestricted Share $ 2.35 $ 1.02 Note 7 - Income from Continuing Operations Per Unrestricted Share (continued) 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 three months and three months ended March 31, 2019 and 2018 , because the effect of inclusion would be anti-dilutive, is presented below. Three Months Ended (Number of Shares in Thousands) Mar 31, Mar 31, Equity-based Compensation Equivalent Shares 574.5 329.6 Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 574.5 329.6

Other Comprehensive Income and

Other Comprehensive Income and Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income	Note 8 - Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income The components of Other Comprehensive Income (Loss) Before Income Taxes for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Other Comprehensive Income (Loss) Before Income Taxes: Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment $ 175.3 $ (119.5 ) Reclassification Adjustment for Amounts Included in Net Income (12.5 ) (1.9 ) Unrealized Holding Gains (Losses) 162.8 (121.4 ) Foreign Currency Translation Adjustments — (0.9 ) Net Unrecognized Postretirement Benefit Costs 0.6 0.3 Gain (Loss) on Cash Flow Hedges During the Period Before Reclassification Adjustment — 0.6 Reclassification Adjustment for Amounts Included in Net Income 0.1 0.3 Gain (Loss) on Cash Flow Hedges 0.1 0.9 Other Comprehensive Income (Loss) Before Income Taxes $ 163.5 $ (121.1 ) The components of Other Comprehensive Income Tax Benefit (Expense) for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Other Comprehensive Income Tax Benefit (Expense): Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment $ (36.8 ) $ 25.0 Reclassification Adjustment for Amounts Included in Net Income 2.6 0.4 Unrealized Holding Gains (34.2 ) 25.4 Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment — 0.2 Net Unrecognized Postretirement Benefit Costs Arising During the Period (0.2 ) — Gain and Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment — (0.1 ) Reclassification Adjustment for Amounts Included in Net Income — (0.1 ) Gain and Loss on Cash Flow Hedges — (0.2 ) Other Comprehensive Income Tax Benefit (Expense) $ (34.4 ) $ 25.4 Note 8 - Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (continued) The components of AOCI at March 31, 2019 and December 31, 2018 were: (Dollars in Millions) Mar 31, Dec 31, Net Unrealized Gains on Investments, Net of Income Taxes: Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings $ — $ — Other Net Unrealized Gains on Investments 247.9 119.3 Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes (94.1 ) (94.5 ) Loss on Cash Flow Hedges, Net of Income Taxes (2.9 ) (3.0 ) Accumulated Other Comprehensive Income $ 150.9 $ 21.8 Components of AOCI were reclassified to the following lines of the Condensed Consolidated Statements of Income for the three months ended March 31, 2019 and 2018 : Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Reclassification of AOCI from Net Unrealized Gains on Investments to: Net Realized Gains on Sales of Investments $ 16.1 $ 2.4 Net Impairment Losses Recognized in Earnings (3.6 ) (0.5 ) Total Before Income Taxes 12.5 1.9 Income Tax Expense (2.6 ) (0.4 ) Reclassification from AOCI, Net of Income Taxes 9.9 1.5 Reclassification of AOCI from Unrecognized Postretirement Benefit Costs to: Interest and Other Expenses 0.6 (0.3 ) Income Tax Benefit (0.2 ) 0.1 Reclassification from AOCI, Net of Income Taxes 0.4 (0.2 ) Reclassification of AOCI from Loss on Cash Flow Hedges to: Interest and Other Expenses 0.1 (0.1 ) Income Tax Benefit — 0.1 Reclassification from AOCI, Net of Income Taxes 0.1 — Total Reclassification from AOCI to Net Income $ 10.4 $ 1.3

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 9 - 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 resulting from an election to update interest rates used to compute the tax basis of reserves on life insurance contracts issued prior to 2018, 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 and 2015 has been extended to December 31, 2019. The expiration of the statute of limitations related to the various state income tax returns that Kemper and its subsidiaries file varies by state. Liabilities for Unrecognized Tax Benefits at March 31, 2019 and December 31, 2018 include $3.0 million and $3.7 million , respectively, for tax positions for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. Because of the impact of deferred income tax accounting, other than for interest and penalties, the disallowance of the shorter deductibility period would not affect the effective income tax rate but would accelerate the payment of cash to the taxing authority to an earlier period. Note 9 - Income Taxes (continued) The Company recognizes interest and penalties, if any, related to unrecognized tax benefits in income tax expense. Liabilities for Unrecognized Tax Benefits included accrued interest of $0.9 million and $0.7 million at March 31, 2019 and December 31, 2018 , respectively. Income taxes paid, net of refunds received, were $0.0 million for the three months ended March 31, 2019 . Income tax refunds received, were $4.6 million for the three months ended March 31, 2018

Pension Benefits and Postretire

Pension Benefits and Postretirement Benefits Other Than Pensions	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Pension Benefits and Postretirement Benefits Other Than Pensions	Note 10 - Pension Benefits and Postretirement Benefits Other Than Pensions The Company sponsors a qualified defined benefit pension plan (the “Pension Plan”) that covers approximately 8,800 participants and beneficiaries, of which 1,400 are active employees. The Pension Plan is closed to employees newly-hired after January 1, 2006. On May 12, 2016, the Company amended the Pension Plan to freeze benefit accruals, effective June 30, 2016, for substantially all of the participants under the plan. The components of Pension Income for the Pension Plan for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Service Cost $ — $ — Interest Cost on Projected Benefit Obligation 5.5 5.1 Expected Return on Plan Assets (7.6 ) (7.2 ) Amortization of Net Actuarial Loss 0.7 1.0 Total Pension Benefit Recognized (1.4 ) (1.1 ) 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 700 retired and 600 active employees. The components of OPEB benefits for the OPEB Plans for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Service Cost $ 0.1 $ — Interest Cost on Accumulated Postretirement Benefit Obligation 0.1 0.1 Amortization of Prior Service Credit (0.3 ) (0.3 ) Amortization of Net Gain (0.5 ) (0.4 ) Total OPEB Benefit Recognized $ (0.6 ) $ (0.6 )

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Business Segments	Note 11 - 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: Preferred Property & Casualty Insurance, Specialty Property & Casualty Insurance and Life & Health Insurance. The Preferred Property & Casualty Insurance segment’s principal products are preferred automobile insurance, homeowners insurance, other personal insurance. The Specialty Property & Casualty Insurance segment’s principal products are specialty automobile insurance and commercial automobile 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. Note 11 - Business Segments (continued) Earned Premiums by product line for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Preferred Property & Casualty Insurance: Personal Automobile $ 115.4 $ 104.9 Homeowners 60.3 61.8 Other Personal Lines 9.9 10.1 Specialty Property & Casualty Insurance: Specialty Automobile 669.6 266.2 Commercial Automobile 59.7 12.2 Life & Health Insurance: Life 95.8 93.7 Accident and Health 46.9 43.3 Property 17.2 17.6 Total Earned Premiums $ 1,074.8 $ 609.8 Segment Revenues, including a reconciliation to Total Revenues, for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Segment Revenues Preferred Property & Casualty Insurance Earned Premiums $ 185.6 $ 176.8 Net Investment Income 8.3 13.7 Total Preferred Property & Casualty Insurance 193.9 190.5 Specialty Property & Casualty Insurance: Earned Premiums 729.3 278.4 Net Investment Income 21.5 9.9 Other Income 0.8 0.3 Total Specialty Property & Casualty Insurance 751.6 288.6 Life & Health Insurance: Earned Premiums 159.9 154.6 Net Investment Income 51.7 53.7 Other Income 1.1 0.8 Total Life & Health Insurance 212.7 209.1 Total Segment Revenues 1,158.2 688.2 Income from Change in Fair Value of Equity and Convertible Securities 64.4 0.7 Net Realized Gains on Sales of Investments 16.1 2.6 Net Impairment Losses Recognized in Earnings (3.6 ) (0.5 ) Other 1.2 2.0 Total Revenues $ 1,236.3 $ 693.0 Note 11 - Business Segments (continued) Segment Operating Profit, including a reconciliation to Income from Continuing Operations before Income Taxes, for the three months ended March 31, 2019 and 2018 was: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Segment Operating Profit : Preferred Property & Casualty Insurance $ 3.3 $ 16.6 Specialty Property & Casualty Insurance 99.4 29.0 Life & Health Insurance 29.3 30.3 Total Segment Operating Profit 132.0 75.9 Corporate and Other Operating Loss (8.6 ) (5.5 ) Adjusted Consolidated Operating Profit 123.4 70.4 Income from Change in Fair Value of Equity and Convertible Securities 64.4 0.7 Net Realized Gains on Sales of Investments 16.1 2.6 Net Impairment Losses Recognized in Earnings (3.6 ) (0.5 ) Acquisition Related Transaction, Integration and Other Costs (5.6 ) (6.2 ) Income from Continuing Operations before Income Taxes $ 194.7 $ 67.0 Segment Net Operating Income, including a reconciliation to Income from Continuing Operations, for the three months and three months ended March 31, 2019 and 2018 was: Three Months Ended (Dollars in Millions and Net of Income Taxes) Mar 31, Mar 31, Segment Net Operating Income: Preferred Property & Casualty Insurance $ 2.8 $ 13.5 Specialty Property & Casualty Insurance 79.6 23.4 Life & Health Insurance 23.1 24.1 Total Segment Net Operating Income 105.5 61.0 Total Corporate and Other Net Operating Income (Loss) (6.6 ) (3.5 ) Adjusted Consolidated Net Operating Income 98.9 57.5 Net Income (Loss) From: Change in Fair Value of Equity and Convertible Securities 50.9 0.6 Net Realized Gains on Sales of Investments 12.7 2.1 Net Impairment Losses Recognized in Earnings (2.8 ) (0.4 ) Acquisition Related Transaction, Integration and Other Costs (4.4 ) (6.2 ) Income from Continuing Operations $ 155.3 $ 53.6

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 12 - 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 Sheet. The valuation of assets measured at fair value in Company’s Condensed Consolidated Balance Sheet at March 31, 2019 is summarized below. Fair Value Measurements (Dollars in Millions) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured at Net Asset Value Total Fair Value Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 154.5 $ 703.9 $ — $ — $ 858.4 States and Political Subdivisions — 1,681.9 — — 1,681.9 Foreign Governments — 5.2 — — 5.2 Corporate Securities: Bonds and Notes — 3,068.2 411.9 — 3,480.1 Collateralized Loan Obligations — 3.0 528.5 — 531.5 Other Mortgage- and Asset-backed — 5.7 10.3 — 16.0 Total Investments in Fixed Maturities 154.5 5,467.9 950.7 — 6,573.1 Equity Securities at Fair Value: Preferred Stocks: Finance, Insurance and Real Estate — 42.7 — — 42.7 Other Industries 0.8 13.3 — — 14.1 Common Stocks: Finance, Insurance and Real Estate 11.4 — — — 11.4 Other Industries 0.3 0.4 — — 0.7 Other Equity Interests: Exchange Traded Funds 656.0 — — — 656.0 Limited Liability Companies and Limited Partnerships — — — 192.0 192.0 Total Investments in Equity Securities at Fair Value 668.5 56.4 — 192.0 916.9 Convertible Securities at Fair Value — 33.8 — — 33.8 Total $ 823.0 $ 5,558.1 $ 950.7 $ 192.0 $ 7,523.8 At March 31, 2019 , the Company had unfunded commitments to invest an additional $138.8 million in certain limited liability investment companies and limited partnerships that will be included in Other Equity Interests if funded. Note 12 - Fair Value Measurements (continued) The valuation of assets measured at fair value in the Company’s Consolidated Balance Sheet at December 31, 2018 is summarized below. Fair Value Measurements (Dollars in Millions) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured at Net Asset Value Total Fair Value Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 156.5 $ 709.2 $ — $ — $ 865.7 States and Political Subdivisions — 1,619.1 — — 1,619.1 Foreign Governments — 5.9 — — 5.9 Corporate Securities: Bonds and Notes — 3,011.2 382.6 — 3,393.8 Collateralized Loan Obligations — 19.1 504.9 — 524.0 Other Mortgage- and Asset-backed — 5.8 9.9 — 15.7 Total Investments in Fixed Maturities 156.5 5,370.3 897.4 — 6,424.2 Equity Securities at Fair Value: Preferred Stocks: Finance, Insurance and Real Estate — 41.2 — — 41.2 Other Industries — 13.0 — — 13.0 Common Stocks: Finance, Insurance and Real Estate 10.2 — — — 10.2 Other Industries 0.2 0.5 — — 0.7 Other Equity Interests: Exchange Traded Funds 427.3 — — — 427.3 Limited Liability Companies and Limited Partnerships — — — 192.0 192.0 Total Investments in Equity Securities at Fair Value 437.7 54.7 — 192.0 684.4 Convertible Securities at Fair Value — 31.5 — — 31.5 Total $ 594.2 $ 5,456.5 $ 897.4 $ 192.0 $ 7,140.1 Note 12 - Fair Value Measurements (continued) The Company’s investments in Fixed Maturities that are classified as Level 1 in the two preceding tables 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 in the two preceding tables 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 in the two preceding tables primarily consist of investments in corporate bonds, obligations of states and political subdivisions, and bonds 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 in the two preceding tables 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 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 Company’s Investments in Fixed Maturities that are classified as Level 3 in the two preceding tables primarily consist of privately placed securities not rated by a Nationally Recognized Statistical Rating Organization and are priced primarily using a market yield approach. A market yield approach uses a risk-free rate plus a credit spread depending on the underlying credit profile of the security. For floating rate securities, the risk-free rate used in the market yield is the contractual floating rate of the security. For each individual security, the Company or the Company’s third party appraiser gathers information from market sources, relevant credit information, perceived market movements and sector news and determines an appropriate market yield for each security. The market yield selected is then used to discount the estimated future cash flows of the security to determine the fair value. The Company separately evaluates market yields based upon asset class to assess the reasonableness of the recorded fair value. For non-investment-grade Investments in Fixed Maturities that are classified as Level 3, the two primary asset classes are senior debt and junior debt. Senior debt includes those securities that receive first priority in a liquidation and junior debt includes any fixed maturity security with other than first priority in a liquidation. The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments in corporate securities classified as Level 3 at March 31, 2019 . (Dollars in Millions) Unobservable Input Total Fair Value Range of Unobservable Inputs Weighted-average Yield Investment-grade Market Yield $ 169.6 2.8 % - 10.7 % 4.6 % Non-investment-grade: Senior Debt Market Yield 124.9 4.6 - 16.4 10.4 Junior Debt Market Yield 110.5 10.4 - 16.9 13.5 Collateralized Loan Obligations (investment grade and non-investment grade) Market Yield 528.5 4.3 - 12.5 5.8 Other Various 17.2 Total Level 3 Fixed Maturity Investments in Corporate Securities $ 950.7 Note 12 - Fair Value Measurements (continued) The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments in corporate securities classified as Level 3 at December 31, 2018 . (Dollars in Millions) Unobservable Input Total Fair Value Range of Unobservable Inputs Weighted-average Yield Investment-grade Market Yield $ 146.7 3.7 % - 10.9 % 5.2 % Non-investment-grade: Senior Debt Market Yield 142.3 4.8 - 30.0 11.5 Junior Debt Market Yield 87.6 11.0 - 28.5 14.2 Collateralized Loan Obligations (investment grade and non-investment grade) Market Yield 504.9 4.1 - 13.4 6.1 Other Various 15.9 Total Level 3 Fixed Maturity Investments in Corporate Securities $ 897.4 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 the fair value increase is generally limited to par, unless callable at a premium, if the security is currently callable. 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 March 31, 2019 is presented below. Fixed Maturities (Dollars in Millions) Corporate Bonds and Notes Collateralized Loan Obligations Other Mortgage- and Asset- backed Total Balance at Beginning of Period $ 382.6 $ 504.9 $ 9.9 $ 897.4 Total Gains (Losses): Included in Condensed Consolidated Statement of Income (2.5 ) (0.3 ) — (2.8 ) Included in Other Comprehensive Income (Loss) 5.4 6.0 0.5 11.9 Purchases 101.3 3.9 — 105.2 Settlements (11.5 ) — (0.1 ) (11.6 ) Sales (65.9 ) — — (65.9 ) Transfers into Level 3 2.5 14.0 — 16.5 Transfers out of Level 3 — — — — Balance at End of Period $ 411.9 $ 528.5 $ 10.3 $ 950.7 Note 12 - Fair Value Measurements (continued) The Company’s policy is to recognize transfers between levels as of the end of the reporting period. There were no transfers between levels 1 and 2 for the three months ended March 31, 2019 . There were no transfers out of Level 3 for the three months ended March 31, 2019 . The transfers into 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 March 31, 2018 is presented below. Fixed Maturities Equity Securities (Dollars in Millions) Corporate Bonds and Notes Redeemable Preferred Stocks Collateralized Loan Obligations Preferred and Common Stocks Other Equity Interests Total Balance at Beginning of Period $ 401.5 $ 0.1 $ 93.2 $ 27.4 $ 34.4 $ 556.6 Total Gains (Losses): Included in Condensed Consolidated Statement of Income 1.8 (0.1 ) 0.5 — — 2.2 Included in Other Comprehensive Income (Loss) (1.6 ) — (0.5 ) — — (2.1 ) Purchases 25.8 — 48.9 — — 74.7 Settlements (18.1 ) — (14.0 ) — — (32.1 ) Sales (13.4 ) — — — — (13.4 ) Transfers into Level 3 0.3 — — — — 0.3 Transfers out of Level 3 (5.0 ) — — (27.4 ) (34.4 ) (66.8 ) Balance at End of Period $ 391.3 $ — $ 128.1 $ — $ — $ 519.4 Note 12 - Fair Value Measurements (continued) The Company’s policy is to recognize transfers between levels as of the end of the reporting period. There were no transfers between levels 1 and 2 for the three months ended March 31, 2018. Transfers out of Level 3 were $66.8 million for the three months ended March 31, 2018, of which $61.8 million was transferred into Equity Securities at Modified Cost due to the adoption of ASU 2016-01 and $5.0 million was transferred into Level 2 due to changes in the availability of market observable inputs. Presented below are the carrying values and fair value estimates of financial instruments not carried at fair value. March 31, 2019 December 31, 2018 (Dollars in Millions) Carrying Value Fair Value Carrying Value Fair Value Financial Assets: Loans to Policyholders $ 301.4 $ 574.5 $ 300.6 $ 542.6 Short-term Investments 350.4 350.4 286.1 286.1 Mortgage Loans 10.6 10.6 — — Financial Liabilities: Debt $ 908.5 $ 933.8 $ 909.0 $ 911.2 Collateralized Investment Borrowings 187.7 187.7 10.0 10.0

Contingencies

Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Note 13 - Contingencies In the ordinary course of its businesses, the Company is involved in legal proceedings, including lawsuits, 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 consolidated financial statements. Over the last decade, there have been an array of initiatives that seek, 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 can include legislation, audits, regulatory examinations and related litigation, could alter the terms of Kemper’s life insurance subsidiaries’ life insurance contracts by imposing requirements that did not exist and were not contemplated at the time those companies entered into such contracts. In 2016, the Company voluntarily began implementing a comprehensive process to compare its life insurance records against one or more death verification databases to determine if any of its insureds may be deceased. Any attempt to estimate the ultimate outcomes of the aforementioned initiatives entails uncertainties including, but not limited to (i) the scope and interpretation of pertinent statutes, including the matching criteria and methodologies to be used in comparing policy records against a death verification database, (ii) the universe of policies affected, (iii) the results of audits, examinations and other actions by regulators and (iv) related litigation. Gain Contingency In October 2015, Kemper’s subsidiary, Kemper Corporate Services, Inc. (“KCSI”), filed a demand for arbitration with the American Arbitration Association (“AAA”), claiming that Computer Sciences Corporation (“CSC”) had breached the terms of a master software license and services agreement and related agreements (collectively, the “Agreements”) by failing, among other things, to timely produce and deliver certain software to KCSI. CSC denied KCSI’s claims and filed a counterclaim. On April 1, 2017, CSC merged with a spin-off of the Enterprise Services business of Hewlett Packard Enterprise Company and is now known as DXC Technology Company (“DXC”). Currently, DXC’s stock is publicly traded on the New York Stock Exchange. Note 13 - Contingencies (continued) In April 2017, the parties participated in an evidentiary hearing in Texas before a AAA-appointed arbitrator. Subsequently, in October 2017, the arbitrator issued a Partial Final Award finding that CSC had breached the Agreements and awarding KCSI direct damages plus pre-judgment interest. KCSI then submitted to the arbitrator a supplemental petition providing pre-judgment interest calculations and seeking an award for certain costs and expenses. In November 2017, the arbitrator issued a Final Award awarding KCSI direct damages against CSC of $84.3 million , prejudgment interest at the annual rate of 9% and costs and expenses in the amount of $7.2 million . KCSI pursued confirmation and enforcement of the Final Award in U.S. District Court in Texas. In December 2017, CSC filed a Petition to Vacate an Arbitration Award in the U.S. District Court in New York and a motion to stay the proceedings in Texas. Following briefing and a hearing, the New York district court denied CSC’s motion to stay the Texas action and instead stayed the New York action. In March 2018, the Texas district court denied CSC’s motion to transfer venue and the New York district court subsequently transferred the vacatur proceeding to Texas. In April 2018, the Texas district court consolidated the two actions and the parties briefed KCSI’s Amended Motion to Confirm Arbitration Award and CSC’s motion to vacate the arbitration award. On September 26, 2018, the Texas district court issued an Amended Final Judgment that (i) confirmed the Arbitration Award in favor of KCSI, (ii) denied CSC’s motion to vacate, and (iii) entered judgment against CSC in the total amount of $141.7 million . CSC is appealing the district court’s ruling to the U.S. Court of Appeals for the Fifth Circuit. In the meantime CSC paid Kemper $35.7 million in September 2018 in partial satisfaction of the final judgment. The Company recognized such payment as a gain in its consolidated statement of income for the year ended December 31, 2018. Subsequent to the date of Company’s condensed consolidated statement of income for the three months ended March 31, 2019, CSC paid Kemper an additional $20.1 million in partial satisfaction of the final judgment. Such payment is treated as a gain contingency for accounting purposes and, accordingly, is not recognized in the Company’s condensed consolidated financial statements for the quarter ended March 31, 2019, but instead will be recognized in the Company’s condensed consolidated financial statements for the quarter ending June 30, 2019.

Related Parties

Related Parties	3 Months Ended
	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Parties	Note 14 - Related Parties Mr. Christopher 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. The Company’s defined benefit pension plan had $143.0 million in assets managed by FS&C at March 31, 2019 under an agreement with FS&C whereby FS&C provides investment management services with respect to certain funds of the plan. Investment expenses incurred in connection with such agreement were $0.2 million and $0.2 million for the three months ended March 31, 2019 and 2018 , respectively.

Acquisition of Business (Tables

Acquisition of Business (Tables)	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	(Dollars in Millions) Investments $ 1,569.3 Short Term Investments 98.8 Cash 4.0 Receivables from Policyholders 583.4 Other Receivables 31.7 Value of Intangible Assets Acquired (Reported in Other Assets) 262.7 Current Income Tax Assets 0.8 Goodwill 1 788.5 Other Assets 102.1 Property and Casualty Insurance Reserves (713.6 ) Unearned Premiums (715.6 ) Debt (282.1 ) Deferred Income Tax Liabilities (11.7 ) Accrued Expenses and Other Liabilities (169.6 ) Total Purchase Price 1,548.7
Business Acquisition, Pro Forma Information

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Investments Classified by Contractual Maturity Date [Table Text Block]	The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at March 31, 2019 by contractual maturity were: (Dollars in Millions) Amortized Cost Fair Value Due in One Year or Less $ 90.1 $ 90.9 Due after One Year to Five Years 905.9 921.6 Due after Five Years to Ten Years 1,658.4 1,731.8 Due after Ten Years 2,434.4 2,649.2 Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,178.1 1,179.6 Investments in Fixed Maturities $ 6,266.9 $ 6,573.1
Schedule of Unrealized Loss on Investments [Table Text Block]	An aging of unrealized losses on the Company’s Investments in Fixed Maturities at March 31, 2019 is presented below. Less Than 12 Months 12 Months or Longer Total (Dollars in Millions) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 13.2 $ (0.2 ) $ 262.2 $ (7.5 ) $ 275.4 $ (7.7 ) States and Political Subdivisions 1.6 (0.3 ) 77.8 (1.4 ) 79.4 (1.7 ) Foreign Governments 4.4 (0.5 ) 0.5 (0.1 ) 4.9 (0.6 ) Corporate Securities: Bonds and Notes 222.6 (5.2 ) 321.4 (12.6 ) 544.0 (17.8 ) Collateralized Loan Obligations 406.6 (6.0 ) 28.7 (0.8 ) 435.3 (6.8 ) Other Mortgage- and Asset-backed — — 4.6 — 4.6 — Total Fixed Maturities 648.4 (12.2 ) 695.2 (22.4 ) 1,343.6 (34.6 ) The Company regularly reviews its fixed maturity investment portfolio for factors that may indicate that a decline in fair value of an investment is other than temporary. The portions of the declines in the fair values of fixed maturity investments that are determined to be other than temporary are reported as losses in the Condensed Consolidated Statements of Income in the periods when such determinations are made. Unrealized losses on fixed maturities, which the Company has determined to be temporary at March 31, 2019 , were $34.6 million , of which $22.4 million was related to fixed maturities that were in an unrealized loss position for 12 months or longer. There were no unrealized losses at March 31, 2019 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “Less Than 12 Months.” There were no unrealized losses at March 31, 2019 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “12 Months or Longer.” Investment-grade fixed maturity investments comprised $23.1 million and below-investment-grade fixed maturity investments comprised $11.5 million of the unrealized losses on investments in fixed maturities at March 31, 2019 . For below-investment-grade fixed maturity investments in an unrealized loss position, the unrealized loss amount, on average, was approximately 4% of the amortized cost basis of the investment. At March 31, 2019 , 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 it recovered the amortized cost of such investments, which may be at maturity. Based on the Company’s Note 3 - Investments (continued) evaluation of the prospects of the issuers at March 31, 2019 , including, but not limited to, the credit ratings of the issuers of the investments in the fixed maturities, and the Company’s intention to not sell and its determination that it would not be required to sell before it recovered the amortized cost of such investments, the Company concluded that the declines in the fair values of the Company’s investments in fixed maturities presented in the preceding table were temporary at the evaluation date. An aging of unrealized losses on the Company’s Investments in Fixed Maturities at December 31, 2018 is presented below. Less Than 12 Months 12 Months or Longer Total (Dollars in Millions) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 401.1 $ (7.6 ) $ 79.0 $ (7.4 ) $ 480.1 $ (15.0 ) States and Political Subdivisions 299.4 (5.0 ) 102.6 (3.6 ) 402.0 (8.6 ) Foreign Governments 4.9 (0.6 ) — — 4.9 (0.6 ) Corporate Securities: Bonds and Notes 1,326.0 (38.2 ) 116.8 (10.9 ) 1,442.8 (49.1 ) Collateralized Loan Obligations 439.2 (13.2 ) — — 439.2 (13.2 ) Other Mortgage- and Asset-backed 0.2 — 4.5 (0.1 ) 4.7 (0.1 ) Total Fixed Maturities 2,470.8 (64.6 ) 302.9 (22.0 ) 2,773.7 (86.6 ) Unrealized losses on fixed maturities, which the Company determined to be temporary at December 31, 2018 , were $86.6 million , of which $22.0 million was related to fixed maturities that were in an unrealized loss position for 12 months or longer. There were no unrealized losses at December 31, 2018 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “Less Than 12 Months.” There were no unrealized losses at December 31, 2018 related to securities for which the Company has recognized credit losses in earnings in the preceding table under the heading “12 Months or Longer.” Investment-grade fixed maturity investments comprised $69.5 million and below-investment-grade fixed maturity investments comprised $17.1 million of the unrealized losses on investments in fixed maturities at December 31, 2018 . 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. At December 31, 2018 , 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 recovery of its amortized cost basis, which may be at maturity. Based on the Company’s evaluation at December 31, 2018 of the prospects of the issuers, including, but not limited to, the credit ratings of the issuers of the investments in the fixed maturities, and the Company’s intention to not sell and its determination that it would not be required to sell before recovery of the amortized cost of such investments, the Company concluded that the declines in the fair values of the Company’s investments in fixed maturities presented in the preceding table were temporary at the evaluation date.
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]	The following table sets forth the pre-tax amount of other than temporary impairment (“OTTI”) credit losses recognized in Retained Earnings for Investments in Fixed Maturities held by the Company as of the beginning and end of the periods presented for which a portion of the OTTI loss related to factors other than credit has been recognized in AOCI, and the corresponding changes in such amounts. Note 3 - Investments (continued) Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at Beginning of Period $ 1.1 $ 1.6 Pre-tax Credit Losses on Fixed Maturities without Pre-tax Credit Losses Included in Cumulative Balance at Beginning of Period 0.1 — Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at End of Period $ 1.2 $ 1.6
Investment Income [Table Text Block]	Net Investment Income for the three months ended March 31, 2019 and 2018 was: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Investment Income: Interest on Fixed Income Securities $ 76.4 $ 62.4 Dividends on Equity Securities Excluding Alternative Investments 2.5 1.9 Alternative Investments: Equity Method Limited Liability Investments (3.6 ) 7.1 Limited Liability Investments Included in Equity Securities 2.6 3.9 Total Alternative Investments (1.0 ) 11.0 Short-term Investments 1.8 0.8 Loans to Policyholders 5.3 5.5 Real Estate 2.5 2.4 Total Investment Income 87.5 84.0 Investment Expenses: Real Estate 2.4 2.3 Other Investment Expenses 2.4 2.5 Total Investment Expenses 4.8 4.8 Net Investment Income $ 82.7 $ 79.2
Schedule of Realized Gain (Loss) [Table Text Block]	Gross gains and losses on sales of investments in fixed maturities for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Fixed Maturities: Gains on Sales $ 15.1 $ 4.1 Losses on Sales (2.6 ) (2.1 )
Schedule of Other Investments [Table Text Block]	The carrying values of the Company’s Other Investments at March 31, 2019 and December 31, 2018 were: (Dollars in Millions) Mar 31, Dec 31, Loans to Policyholders at Unpaid Principal $ 301.4 $ 300.6 Real Estate at Depreciated Cost 113.6 114.2 Mortgage Loans 10.6 — Total $ 425.6 $ 414.8
Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at March 31, 2019 were: Amortized Cost Gross Unrealized Fair Value (Dollars in Millions) Gains Losses U.S. Government and Government Agencies and Authorities $ 845.9 $ 20.2 $ (7.7 ) $ 858.4 States and Political Subdivisions 1,582.2 101.4 (1.7 ) 1,681.9 Foreign Governments 5.8 — (0.6 ) 5.2 Corporate Securities: Bonds and Notes 3,281.5 216.4 (17.8 ) 3,480.1 Collateralized Loan Obligations 536.8 1.5 (6.8 ) 531.5 Other Mortgage- and Asset-backed 14.7 1.3 — 16.0 Investments in Fixed Maturities $ 6,266.9 $ 340.8 $ (34.6 ) $ 6,573.1 The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2018 were: Amortized Cost Gross Unrealized Fair Value (Dollars in Millions) Gains Losses U.S. Government and Government Agencies and Authorities $ 865.9 $ 14.8 $ (15.0 ) $ 865.7 States and Political Subdivisions 1,553.7 74.0 (8.6 ) 1,619.1 Foreign Governments 6.5 — (0.6 ) 5.9 Corporate Securities: Bonds and Notes 3,307.8 135.1 (49.1 ) 3,393.8 Collateralized Loan Obligations 535.7 1.5 (13.2 ) 524.0 Other Mortgage- and Asset-backed 14.9 0.9 (0.1 ) 15.7 Investments in Fixed Maturities $ 6,284.5 $ 226.3 $ (86.6 ) $ 6,424.2

Property and Casualty Insuran_2

Property and Casualty Insurance Reserves (Tables)	3 Months Ended
	Mar. 31, 2019
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]
Liability for Unpaid Claims Adjustment Expense by Expense Type [Table Text Block]	Property and casualty insurance reserve activity for the three months ended March 31, 2019 and 2018 was: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Property and Casualty Insurance Reserves: Gross of Reinsurance and Indemnification at Beginning of Year $ 1,874.9 $ 1,016.8 Less Reinsurance and Indemnification Recoverables at Beginning of Year 101.9 53.1 Property and Casualty Insurance Reserves - Net of Reinsurance at Beginning of Year 1,773.0 963.7 Incurred Losses and LAE Related to: Current Year: Continuing Operations 687.6 339.3 Prior Years: Continuing Operations (21.4 ) (1.0 ) Discontinued Operations — (0.3 ) Total Incurred Losses and LAE Related to Prior Years (21.4 ) (1.3 ) Total Incurred Losses and LAE 666.2 338.0 Paid Losses and LAE Related to: Current Year: Continuing Operations 223.5 125.3 Prior Years: Continuing Operations 444.5 222.2 Discontinued Operations 0.9 0.7 Total Paid Losses and LAE Related to Prior Years 445.4 222.9 Total Paid Losses and LAE 668.9 348.2 Property and Casualty Insurance Reserves - Net of Reinsurance at End of Period 1,770.3 953.5 Plus Reinsurance Recoverables at End of Period 98.4 51.6 Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period $ 1,868.7 $ 1,005.1

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	The following summarizes the terms of the Company’s Collateralized Investment Borrowings at March 31, 2019 : (Dollars in Millions) Principal Borrowings Weighted-average Interest Rate Due in One Year or Less $ 93.1 2.61 % Due after One Year to Two Years 92.0 2.73 % Due after Two Years to Three Years 2.6 2.71 % $ 187.7 March 31, 2019 and December 31, 2018 was: (Dollars in Millions) Mar 31, Dec 31, Term Loan due June 29, 2020 $ 34.9 $ 34.9 5.0% Senior Notes due September 19, 2022 281.0 281.5 4.35% Senior Notes due February 15, 2025 448.4 448.4 7.375% Subordinated Debentures due February 27, 2054 144.2 144.2 Total Long-term Debt Outstanding $ 908.5 $ 909.0

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Lease, Cost [Table Text Block]	Lease expenses are primarily included in insurance expenses in the condensed consolidated statement of income. Additional information regarding the Company’s operating leases is presented below. (Dollars in Millions) Three Months Ended Mar 31, 2019 Lease Cost: Amortization of Right-of-Use Assets $ 0.2 Operating Lease Cost 5.7 Short-Term Lease Cost (1) 0.1 Total Expense 6.0 Less: Sublease Income (2) (0.1 ) Total Lease Cost $ 5.9 (1) - Leases with an initial term of twelve months or less are not recorded on the balance sheet. (2) - Sublease income consists of rent from third parties of office space and is recognized as part of other income in the Condensed Consolidated Statements of Income. Note 6 - Leases (continued) Other Information on Operating Leases Supplemental cash flow information related to the Company’s operating leases for the three months ended March 31, 2019 is as follows: (Dollars in Millions) Operating Cash Flows from Operating Lease (Fixed Payments) $ 5.2 Operating Cash Flows from Operating Lease (Liability Reduction) 4.7 Financing Cash Flows from Finance Leases 0.2 Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities 9.1 Significant judgments and assumptions for determining lease asset and liability at March 31, 2019 are presented below. Weighted-average Remaining Lease Term - Finance Leases 1.9 years Weighted-average Remaining Lease Term - Operating Leases 6.8 years Weighted-average Discount Rate - Finance Leases 4.0 % Weighted-average Discount Rate - Operating Leases 4.0 %
Schedule of Future Minimum Lease Payments for Capital and Operating Leases [Table Text Block]	Future minimum lease payments under capital and operating leases at December 31, 2018 are presented below. (Dollars in Millions) Capital Operating 2019 $ 0.7 $ 20.5 2020 0.7 18.4 2021 0.3 16.9 2022 0.2 15.0 2023 — 12.5 2024 and Thereafter — 27.1 Total Future Payments $ 1.9 $ 110.4 Less Imputed Interest — Present Value of Minimum Capital Lease Payments $ 1.9

Income (Loss) from Continuing O

Income (Loss) from Continuing Operations Per Unrestricted Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]	A reconciliation of the numerator and denominator used in the calculation of Basic Income from Continuing Operations Per Unrestricted Share and Diluted Income from Continuing Operations Per Unrestricted Share for the three months ended March 31, 2019 and 2018 is presented below. Three Months Ended Mar 31, Mar 31, (Dollars in Millions) Income from Continuing Operations $ 155.3 $ 53.6 Less Income from Continuing Operations Attributed to Participating Awards 0.7 0.5 Income from Continuing Operations Attributed to Unrestricted Shares 154.6 53.1 Diluted Income from Continuing Operations Attributed to Unrestricted Shares $ 154.6 $ 53.1 (Number of Shares in Thousands) Weighted-average Unrestricted Shares Outstanding 64,815.0 51,502.9 Equity-based Compensation Equivalent Shares 791.0 365.3 Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 65,606.0 51,868.2 (Per Unrestricted Share in Whole Dollars) Basic Income from Continuing Operations Per Unrestricted Share $ 2.38 $ 1.03 Diluted Income from Continuing Operations Per Unrestricted Share $ 2.35 $ 1.02
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	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 three months and three months ended March 31, 2019 and 2018 , because the effect of inclusion would be anti-dilutive, is presented below. Three Months Ended (Number of Shares in Thousands) Mar 31, Mar 31, Equity-based Compensation Equivalent Shares 574.5 329.6 Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 574.5 329.6

Other Comprehensive Income (Los

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Schedule of Comprehensive Income [Table Text Block]	The components of Other Comprehensive Income (Loss) Before Income Taxes for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Other Comprehensive Income (Loss) Before Income Taxes: Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment $ 175.3 $ (119.5 ) Reclassification Adjustment for Amounts Included in Net Income (12.5 ) (1.9 ) Unrealized Holding Gains (Losses) 162.8 (121.4 ) Foreign Currency Translation Adjustments — (0.9 ) Net Unrecognized Postretirement Benefit Costs 0.6 0.3 Gain (Loss) on Cash Flow Hedges During the Period Before Reclassification Adjustment — 0.6 Reclassification Adjustment for Amounts Included in Net Income 0.1 0.3 Gain (Loss) on Cash Flow Hedges 0.1 0.9 Other Comprehensive Income (Loss) Before Income Taxes $ 163.5 $ (121.1 ) three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Other Comprehensive Income Tax Benefit (Expense): Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment $ (36.8 ) $ 25.0 Reclassification Adjustment for Amounts Included in Net Income 2.6 0.4 Unrealized Holding Gains (34.2 ) 25.4 Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment — 0.2 Net Unrecognized Postretirement Benefit Costs Arising During the Period (0.2 ) — Gain and Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment — (0.1 ) Reclassification Adjustment for Amounts Included in Net Income — (0.1 ) Gain and Loss on Cash Flow Hedges — (0.2 ) Other Comprehensive Income Tax Benefit (Expense) $ (34.4 ) $ 25.4
Schedule of Accumulated Other Comprehensive Income [Table Text Block]	The components of AOCI at March 31, 2019 and December 31, 2018 were: (Dollars in Millions) Mar 31, Dec 31, Net Unrealized Gains on Investments, Net of Income Taxes: Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings $ — $ — Other Net Unrealized Gains on Investments 247.9 119.3 Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes (94.1 ) (94.5 ) Loss on Cash Flow Hedges, Net of Income Taxes (2.9 ) (3.0 ) Accumulated Other Comprehensive Income $ 150.9 $ 21.8
Reclassification out of Accumulated Comprehensive Income [Table Text Block]	The components of AOCI at March 31, 2019 and December 31, 2018 were: (Dollars in Millions) Mar 31, Dec 31, Net Unrealized Gains on Investments, Net of Income Taxes: Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings $ — $ — Other Net Unrealized Gains on Investments 247.9 119.3 Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes (94.1 ) (94.5 ) Loss on Cash Flow Hedges, Net of Income Taxes (2.9 ) (3.0 ) Accumulated Other Comprehensive Income $ 150.9 $ 21.8

Pension Benefits and Postreti_2

Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)	3 Months Ended
	Mar. 31, 2019
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	The components of Pension Income for the Pension Plan for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Service Cost $ — $ — Interest Cost on Projected Benefit Obligation 5.5 5.1 Expected Return on Plan Assets (7.6 ) (7.2 ) Amortization of Net Actuarial Loss 0.7 1.0 Total Pension Benefit Recognized (1.4 ) (1.1 )
Postretirement Benefits Other than Pensions [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	The components of OPEB benefits for the OPEB Plans for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Service Cost $ 0.1 $ — Interest Cost on Accumulated Postretirement Benefit Obligation 0.1 0.1 Amortization of Prior Service Credit (0.3 ) (0.3 ) Amortization of Net Gain (0.5 ) (0.4 ) Total OPEB Benefit Recognized $ (0.6 ) $ (0.6 )

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Revenue from External Customers by Products and Services [Table Text Block]	Earned Premiums by product line for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Preferred Property & Casualty Insurance: Personal Automobile $ 115.4 $ 104.9 Homeowners 60.3 61.8 Other Personal Lines 9.9 10.1 Specialty Property & Casualty Insurance: Specialty Automobile 669.6 266.2 Commercial Automobile 59.7 12.2 Life & Health Insurance: Life 95.8 93.7 Accident and Health 46.9 43.3 Property 17.2 17.6 Total Earned Premiums $ 1,074.8 $ 609.8
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]	Segment Revenues, including a reconciliation to Total Revenues, for the three months ended March 31, 2019 and 2018 were: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Segment Revenues Preferred Property & Casualty Insurance Earned Premiums $ 185.6 $ 176.8 Net Investment Income 8.3 13.7 Total Preferred Property & Casualty Insurance 193.9 190.5 Specialty Property & Casualty Insurance: Earned Premiums 729.3 278.4 Net Investment Income 21.5 9.9 Other Income 0.8 0.3 Total Specialty Property & Casualty Insurance 751.6 288.6 Life & Health Insurance: Earned Premiums 159.9 154.6 Net Investment Income 51.7 53.7 Other Income 1.1 0.8 Total Life & Health Insurance 212.7 209.1 Total Segment Revenues 1,158.2 688.2 Income from Change in Fair Value of Equity and Convertible Securities 64.4 0.7 Net Realized Gains on Sales of Investments 16.1 2.6 Net Impairment Losses Recognized in Earnings (3.6 ) (0.5 ) Other 1.2 2.0 Total Revenues $ 1,236.3 $ 693.0
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]	Segment Operating Profit, including a reconciliation to Income from Continuing Operations before Income Taxes, for the three months ended March 31, 2019 and 2018 was: Three Months Ended (Dollars in Millions) Mar 31, Mar 31, Segment Operating Profit : Preferred Property & Casualty Insurance $ 3.3 $ 16.6 Specialty Property & Casualty Insurance 99.4 29.0 Life & Health Insurance 29.3 30.3 Total Segment Operating Profit 132.0 75.9 Corporate and Other Operating Loss (8.6 ) (5.5 ) Adjusted Consolidated Operating Profit 123.4 70.4 Income from Change in Fair Value of Equity and Convertible Securities 64.4 0.7 Net Realized Gains on Sales of Investments 16.1 2.6 Net Impairment Losses Recognized in Earnings (3.6 ) (0.5 ) Acquisition Related Transaction, Integration and Other Costs (5.6 ) (6.2 ) Income from Continuing Operations before Income Taxes $ 194.7 $ 67.0
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block]	Segment Net Operating Income, including a reconciliation to Income from Continuing Operations, for the three months and three months ended March 31, 2019 and 2018 was: Three Months Ended (Dollars in Millions and Net of Income Taxes) Mar 31, Mar 31, Segment Net Operating Income: Preferred Property & Casualty Insurance $ 2.8 $ 13.5 Specialty Property & Casualty Insurance 79.6 23.4 Life & Health Insurance 23.1 24.1 Total Segment Net Operating Income 105.5 61.0 Total Corporate and Other Net Operating Income (Loss) (6.6 ) (3.5 ) Adjusted Consolidated Net Operating Income 98.9 57.5 Net Income (Loss) From: Change in Fair Value of Equity and Convertible Securities 50.9 0.6 Net Realized Gains on Sales of Investments 12.7 2.1 Net Impairment Losses Recognized in Earnings (2.8 ) (0.4 ) Acquisition Related Transaction, Integration and Other Costs (4.4 ) (6.2 ) Income from Continuing Operations $ 155.3 $ 53.6

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]	The valuation of assets measured at fair value in Company’s Condensed Consolidated Balance Sheet at March 31, 2019 is summarized below. Fair Value Measurements (Dollars in Millions) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured at Net Asset Value Total Fair Value Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 154.5 $ 703.9 $ — $ — $ 858.4 States and Political Subdivisions — 1,681.9 — — 1,681.9 Foreign Governments — 5.2 — — 5.2 Corporate Securities: Bonds and Notes — 3,068.2 411.9 — 3,480.1 Collateralized Loan Obligations — 3.0 528.5 — 531.5 Other Mortgage- and Asset-backed — 5.7 10.3 — 16.0 Total Investments in Fixed Maturities 154.5 5,467.9 950.7 — 6,573.1 Equity Securities at Fair Value: Preferred Stocks: Finance, Insurance and Real Estate — 42.7 — — 42.7 Other Industries 0.8 13.3 — — 14.1 Common Stocks: Finance, Insurance and Real Estate 11.4 — — — 11.4 Other Industries 0.3 0.4 — — 0.7 Other Equity Interests: Exchange Traded Funds 656.0 — — — 656.0 Limited Liability Companies and Limited Partnerships — — — 192.0 192.0 Total Investments in Equity Securities at Fair Value 668.5 56.4 — 192.0 916.9 Convertible Securities at Fair Value — 33.8 — — 33.8 Total $ 823.0 $ 5,558.1 $ 950.7 $ 192.0 $ 7,523.8 At March 31, 2019 , the Company had unfunded commitments to invest an additional $138.8 million in certain limited liability investment companies and limited partnerships that will be included in Other Equity Interests if funded. Note 12 - Fair Value Measurements (continued) The valuation of assets measured at fair value in the Company’s Consolidated Balance Sheet at December 31, 2018 is summarized below. Fair Value Measurements (Dollars in Millions) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured at Net Asset Value Total Fair Value Fixed Maturities: U.S. Government and Government Agencies and Authorities $ 156.5 $ 709.2 $ — $ — $ 865.7 States and Political Subdivisions — 1,619.1 — — 1,619.1 Foreign Governments — 5.9 — — 5.9 Corporate Securities: Bonds and Notes — 3,011.2 382.6 — 3,393.8 Collateralized Loan Obligations — 19.1 504.9 — 524.0 Other Mortgage- and Asset-backed — 5.8 9.9 — 15.7 Total Investments in Fixed Maturities 156.5 5,370.3 897.4 — 6,424.2 Equity Securities at Fair Value: Preferred Stocks: Finance, Insurance and Real Estate — 41.2 — — 41.2 Other Industries — 13.0 — — 13.0 Common Stocks: Finance, Insurance and Real Estate 10.2 — — — 10.2 Other Industries 0.2 0.5 — — 0.7 Other Equity Interests: Exchange Traded Funds 427.3 — — — 427.3 Limited Liability Companies and Limited Partnerships — — — 192.0 192.0 Total Investments in Equity Securities at Fair Value 437.7 54.7 — 192.0 684.4 Convertible Securities at Fair Value — 31.5 — — 31.5 Total $ 594.2 $ 5,456.5 $ 897.4 $ 192.0 $ 7,140.1
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]	The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments in corporate securities classified as Level 3 at March 31, 2019 . (Dollars in Millions) Unobservable Input Total Fair Value Range of Unobservable Inputs Weighted-average Yield Investment-grade Market Yield $ 169.6 2.8 % - 10.7 % 4.6 % Non-investment-grade: Senior Debt Market Yield 124.9 4.6 - 16.4 10.4 Junior Debt Market Yield 110.5 10.4 - 16.9 13.5 Collateralized Loan Obligations (investment grade and non-investment grade) Market Yield 528.5 4.3 - 12.5 5.8 Other Various 17.2 Total Level 3 Fixed Maturity Investments in Corporate Securities $ 950.7 Note 12 - Fair Value Measurements (continued) The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments in corporate securities classified as Level 3 at December 31, 2018 . (Dollars in Millions) Unobservable Input Total Fair Value Range of Unobservable Inputs Weighted-average Yield Investment-grade Market Yield $ 146.7 3.7 % - 10.9 % 5.2 % Non-investment-grade: Senior Debt Market Yield 142.3 4.8 - 30.0 11.5 Junior Debt Market Yield 87.6 11.0 - 28.5 14.2 Collateralized Loan Obligations (investment grade and non-investment grade) Market Yield 504.9 4.1 - 13.4 6.1 Other Various 15.9 Total Level 3 Fixed Maturity Investments in Corporate Securities $ 897.4
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	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 March 31, 2019 is presented below. Fixed Maturities (Dollars in Millions) Corporate Bonds and Notes Collateralized Loan Obligations Other Mortgage- and Asset- backed Total Balance at Beginning of Period $ 382.6 $ 504.9 $ 9.9 $ 897.4 Total Gains (Losses): Included in Condensed Consolidated Statement of Income (2.5 ) (0.3 ) — (2.8 ) Included in Other Comprehensive Income (Loss) 5.4 6.0 0.5 11.9 Purchases 101.3 3.9 — 105.2 Settlements (11.5 ) — (0.1 ) (11.6 ) Sales (65.9 ) — — (65.9 ) Transfers into Level 3 2.5 14.0 — 16.5 Transfers out of Level 3 — — — — Balance at End of Period $ 411.9 $ 528.5 $ 10.3 $ 950.7 Note 12 - Fair Value Measurements (continued) The Company’s policy is to recognize transfers between levels as of the end of the reporting period. There were no transfers between levels 1 and 2 for the three months ended March 31, 2019 . There were no transfers out of Level 3 for the three months ended March 31, 2019 . The transfers into 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 March 31, 2018 is presented below. Fixed Maturities Equity Securities (Dollars in Millions) Corporate Bonds and Notes Redeemable Preferred Stocks Collateralized Loan Obligations Preferred and Common Stocks Other Equity Interests Total Balance at Beginning of Period $ 401.5 $ 0.1 $ 93.2 $ 27.4 $ 34.4 $ 556.6 Total Gains (Losses): Included in Condensed Consolidated Statement of Income 1.8 (0.1 ) 0.5 — — 2.2 Included in Other Comprehensive Income (Loss) (1.6 ) — (0.5 ) — — (2.1 ) Purchases 25.8 — 48.9 — — 74.7 Settlements (18.1 ) — (14.0 ) — — (32.1 ) Sales (13.4 ) — — — — (13.4 ) Transfers into Level 3 0.3 — — — — 0.3 Transfers out of Level 3 (5.0 ) — — (27.4 ) (34.4 ) (66.8 ) Balance at End of Period $ 391.3 $ — $ 128.1 $ — $ — $ 519.4 Note 12 - Fair Value Measurements (continued) The Company’s policy is to recognize transfers between levels as of the end of the reporting period. There were no transfers between levels 1 and 2 for the three months ended March 31, 2018. Transfers out of Level 3 were $66.8 million for the three months ended March 31, 2018, of which $61.8 million was transferred into Equity Securities at Modified Cost due to the adoption of ASU 2016-01 and $5.0 million was transferred into Level 2 due to changes in the availability of market observable inputs.
Fair Value, by Balance Sheet Grouping [Table Text Block]	Presented below are the carrying values and fair value estimates of financial instruments not carried at fair value. March 31, 2019 December 31, 2018 (Dollars in Millions) Carrying Value Fair Value Carrying Value Fair Value Financial Assets: Loans to Policyholders $ 301.4 $ 574.5 $ 300.6 $ 542.6 Short-term Investments 350.4 350.4 286.1 286.1 Mortgage Loans 10.6 10.6 — — Financial Liabilities: Debt $ 908.5 $ 933.8 $ 909.0 $ 911.2 Collateralized Investment Borrowings 187.7 187.7 10.0 10.0

Basis of Presentation Narrative

Basis of Presentation Narrative (Details) - USD ($) $ in Millions	Jan. 01, 2019	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 78
Finance Lease, Liability	82.5
Deferred Rent Credit, Current	$ 4.5
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (18.2)
AOCI Attributable to Parent [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 18.2

Acquisition of Business (Narrat

Acquisition of Business (Narrative) (Details) - Infinity [Member] - USD ($) $ in Millions	Jul. 02, 2018	Mar. 31, 2019
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Legal Accruals, Other LIabilities and Tax Related Balance		$ 0.9
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill		$ 0.9
Secured Debt [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred	$ 250

Acquisition of Business (Purcha

Acquisition of Business (Purchase Price Allocation) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Jul. 02, 2018
Business Acquisition [Line Items]
Goodwill	$ 1,111.5	$ 1,112.4
Infinity Property and Casualty Corporation [Member]
Business Acquisition [Line Items]
Investments			$ 1,569.3
Short Term Investments			98.8
Receivables from Policyholders			4
Other Receivables			583.4
Other Receivables			31.7
Value of Intangible Assets Acquired (Reported in Other Assets)			262.7
Goodwill			788.5
Other Assets			102.1
Property and Casualty Insurance Reserves			(713.6)
Unearned Premiums			(715.6)
Debt			(282.1)
Deferred Income Tax Liabilities			(11.7)
Accrued Expenses and Other Liabilities			(169.6)
Total Purchase Price			1,548.7
Current Income Tax Asset [Member] | Infinity Property and Casualty Corporation [Member]
Business Acquisition [Line Items]
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets			$ 0.8

Investments (Schedule of Fixed

Investments (Schedule of Fixed Maturities) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	$ 6,266.9	$ 6,284.5
Fair Value	6,573.1	6,424.2
Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	6,266.9	6,284.5
Gross unrealized gains	340.8	226.3
Gross unrealized loss	34.6	86.6
Fair Value	6,573.1	6,424.2
U.S. Government and Government Agencies and Authorities
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	845.9	865.9
Gross unrealized gains	20.2	14.8
Gross unrealized loss	7.7	15
Fair Value	858.4	865.7
States and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	1,582.2	1,553.7
Gross unrealized gains	101.4	74
Gross unrealized loss	1.7	8.6
Fair Value	1,681.9	1,619.1
Foreign Governments
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	5.8	6.5
Gross unrealized gains	0	0
Gross unrealized loss	0.6	0.6
Fair Value	5.2	5.9
Bonds and Notes
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	3,281.5	3,307.8
Gross unrealized gains	216.4	135.1
Gross unrealized loss	17.8	49.1
Fair Value	3,480.1	3,393.8
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	536.8	535.7
Gross unrealized gains	1.5	1.5
Gross unrealized loss	6.8	13.2
Fair Value	531.5	524
Other Mortgage- and Asset-backed
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	14.7	14.9
Gross unrealized gains	1.3	0.9
Gross unrealized loss	0	0.1
Fair Value	$ 16	$ 15.7

Investments (Amortized costs an

Investments (Amortized costs and Estimated Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost
Due in One Year or Less	$ 90.1
Due after One Year to Five Years	905.9
Due after Five Years to Ten Years	1,658.4
Due after Ten Years	2,434.4
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	1,178.1
Investments in Fixed Maturities	6,266.9	$ 6,284.5
Fair Value
Due in One Year or Less	90.9
Due after One Year to Five Years	921.6
Due after Five Years to Ten Years	1,731.8
Due after Ten Years	2,649.2
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	1,179.6
Investments in Fixed Maturities	$ 6,573.1	$ 6,424.2

Investments (Continuous unreali

Investments (Continuous unrealized loss) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
U.S. Government and Government Agencies and Authorities
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
12 Months or Longer	$ 262.2	$ 79
Total	275.4	480.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	13.2	401.1
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than 12 Months	0.2	7.6
12 Months or Longer	7.5	7.4
Total	7.7	15
States and Political Subdivisions
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
12 Months or Longer	77.8	102.6
Total	79.4	402
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1.6	299.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than 12 Months	0.3	5
12 Months or Longer	1.4	3.6
Total	1.7	8.6
Foreign Governments
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		4.9
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
12 Months or Longer	0.5
Total	4.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		4.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	4.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than 12 Months	0.5
12 Months or Longer	0.1
Total	0.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		0.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Bonds and Notes
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
12 Months or Longer	321.4	116.8
Total	544	1,442.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	222.6	1,326
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than 12 Months	5.2	38.2
12 Months or Longer	12.6	10.9
Total	17.8	49.1
Collateralized Loan Obligations
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
12 Months or Longer	28.7	0
Total	435.3	439.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	406.6	439.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than 12 Months	6	13.2
12 Months or Longer	0.8	0
Total	6.8	13.2
Other Mortgage- and Asset-backed
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		4.7
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
12 Months or Longer	4.6
Total	4.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		4.5
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than 12 Months	0
12 Months or Longer	0
Total	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0.1
Investments in Fixed Maturities
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
12 Months or Longer	695.2	302.9
Total	1,343.6	2,773.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	648.4	2,470.8
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less Than 12 Months	12.2	64.6
12 Months or Longer	22.4	22
Total	34.6	86.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	34.6	86.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 22.4	$ 22

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 63,400,000
Other Receivables	254,600,000	$ 245,400,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	1,178,100,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	1,179,600,000
Other Liabilities	742,700,000	687,300,000
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses		0	$ 0
Available For Sale Securities, Continuous Unrealized Loss Position, Credit Losses Recognized Related to Securities in An Unrealized Loss Position, In a Position of 12 Months or Longer	0		$ 0
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount	200,000
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount		5.1
Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months	648,400,000	2,470,800,000
Total	34,600,000	86,600,000
12 Months or Longer	22,400,000	22,000,000
Other Liabilities	15,500,000	10,500,000
Less Than 12 Months	12,200,000	64,600,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	695,200,000	302,900,000
12 Months or Longer	22,400,000	22,000,000
Debt Securities, Available-for-sale, Unrealized Loss Position	1,343,600,000	2,773,700,000
Total	34,600,000	86,600,000
U.S. Government and Government Agencies and Authorities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months	13,200,000	401,100,000
Less Than 12 Months	200,000	7,600,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	262,200,000	79,000,000
12 Months or Longer	7,500,000	7,400,000
Debt Securities, Available-for-sale, Unrealized Loss Position	275,400,000	480,100,000
Total	7,700,000	15,000,000
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Debt Securities, Available-for-sale [Line Items]
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	616,400,000
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Debt Securities, Available-for-sale [Line Items]
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	8,100,000
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Debt Securities, Available-for-sale [Line Items]
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	7,600,000
Other Non-Governmental Issuers [Member]
Debt Securities, Available-for-sale [Line Items]
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date	547,500,000
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Other Receivables	0	0
Other Liabilities		0
External Credit Rating, Investment Grade [Member] | Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Total	23,100,000	69,500,000
External Credit Rating, Non Investment Grade [Member] | Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Total	$ 11,500,000	$ 17,100,000
Percentage of Unrealized Loss Position to Amortized Cost Basis of Available for Sale Security Average	4.00%		5.00%

Investments - Schedule of Other

Investments - Schedule of Other Than Temporary Impairment (Details) - Fixed Maturities [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at Beginning of Period	$ 1.1	$ 1.6
Pre-tax Credit Losses on Fixed Maturities without Pre-tax Credit Losses Included in Cumulative Balance at Beginning of Period	0.1	0
Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at End of Period	$ 1.2	$ 1.6

Investments - Net Realized Gain

Investments - Net Realized Gains on Sales of Investments (Details) - Fixed Maturities: - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Investment Income [Line Items]
Realized Gains	$ 15.1	$ 4.1
Realized Losses	$ (2.6)	$ (2.1)

Investments - Equity Method Lim

Investments - Equity Method Limited Liability Investments (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Equity Method Limited Liability Investments, Maximum Exposure to Loss	$ 197.8	$ 187
Outstanding Commitments to Fund Equity Method Limited Liability Investments	$ 105.2

Investments - Schedule of Oth_2

Investments - Schedule of Other Investments (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Loans to Policyholders at Unpaid Principal	$ 301.4	$ 300.6
Real Estate at Depreciated Cost	113.6	114.2
Mortgage Loans on Real Estate, Commercial and Consumer, Net	10.6	0
Total	$ 425.6	$ 414.8

Investments Investments - Net I

Investments Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Investment Income [Line Items]
Investment Income, Equity Method Limited Liability Investments	$ (3.6)	$ 7.1
Investment Income, Limited Liability Investments Included in Equity Securities	2.6	3.9
Investment Income, Alternative Investments	(1)	11
Investment Income, Real Estate	2.5	2.4
Gross Investment Income	87.5	84
Investment Income, Investment Expense	4.8	4.8
Net Investment Income	82.7	79.2
Fixed Maturities:
Net Investment Income [Line Items]
Interest and Dividend Income, Operating	76.4	62.4
Equity Securities [Member]
Net Investment Income [Line Items]
Interest and Dividend Income, Operating	2.5	1.9
Short-term Investments [Member]
Net Investment Income [Line Items]
Interest and Dividend Income, Operating	1.8	0.8
Policy Loans [Member]
Net Investment Income [Line Items]
Interest and Dividend Income, Operating	5.3	5.5
Real Estate Investment [Member]
Net Investment Income [Line Items]
Investment Income, Investment Expense	2.4	2.3
Other Investment [Member]
Net Investment Income [Line Items]
Investment Income, Investment Expense	$ 2.4	$ 2.5

Investments Schedule of Equity

Investments Schedule of Equity Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Securities [Abstract]
Equity Securities at Fair Value	$ 916,900,000	$ 684,400,000
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount	$ 200,000
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount		$ 5.1

Property and Casualty Insuran_3

Property and Casualty Insurance Reserves (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Property and Casulty Insurance Reserve - Gross of Reinsurance at Beginning of Year	$ 1,874.9	$ 1,016.8
Property and Casualty Insurance Reserves - Net of Reinsurance at Beginning of Year	1,773	963.7
Incurred Losses and LAE Related to Prior Years	(21.4)	(1.3)
Total Incurred Losses and LAE	666.2	338
Paid Losses and LAE Related to Prior Years	445.4	222.9
Total Paid Losses and LAE	668.9	348.2
Property and Casualty Insurance Reserves - Net of Reinsurance at End of Period	1,770.3	953.5	$ 963.7
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period	1,868.7	1,005.1	1,016.8
Continuing Operations [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Current Year	687.6	339.3
Incurred Losses and LAE Related to Prior Years	(21.4)	(1)
Paid Losses and LAE Related to Current Year	223.5	125.3
Paid Losses and LAE Related to Prior Years	444.5	222.2
Discontinued Operations [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	0	(0.3)
Paid Losses and LAE Related to Prior Years	0.9	0.7
Specialty Automobile [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	(14.3)
Commercial Automobile Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	(3.8)
Commercial Automobile Insurance [Member] | Continuing Operations [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years			(0.7)
Other Personal Lines [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	(1.8)	(1.2)
Preferred Automobile [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years	(1.3)	0.5
Non-Catastrophe [Member] | Homeowners [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years		5.6
Catastrophe [Member] | Homeowners [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Incurred Losses and LAE Related to Prior Years		(5.1)
Property and Casualty Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Less Reinsurance and Indemnification Recoverables at Beginning of Year	101.9	53.1
Plus Reinsurance Recoverables at End of Period	$ 98.4	$ 51.6	$ 53.1

Debt (Details)

Debt (Details) - USD ($)	Jul. 02, 2018	Jun. 29, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Sep. 30, 2018
Debt Instrument [Line Items]
Long-term Debt, Gross			$ 908,500,000		$ 909,000,000
Repayments of Debt					215,000,000
Debt Instrument, Collateral Amount			198,000,000		15,700,000
Interest Expense			11,500,000	$ 8,000,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities			19,800,000	12,500,000
Secured Debt [Member]
Debt Instrument [Line Items]
Proceeds from Debt, Net of Issuance Costs		$ 249,400,000
Senior Notes [Member] | Term Loan Due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			34,900,000		34,900,000
Senior Notes [Member] | Senior Note Due on September Nineteen,Twenty Twenty Two [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			281,000,000		281,500,000
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			448,400,000		448,400,000
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			144,200,000		144,200,000
Notes Payable under Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding						$ 0
Federal Home Loan Bank of Dallas [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Stock			3,300,000
Federal Home Loan Bank of Chicago [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances					10,000,000
Federal Home Loan Bank Stock			3,800,000		800,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances			$ 187,700,000	$ 10,000,000	$ 10,000,000
Infinity [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred	$ 250,000,000
Infinity [Member] | Senior Notes [Member] | Senior Note Due on September Nineteen,Twenty Twenty Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Premium	(7,100,000)
Debt Instrument, Face Amount	$ 275,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	$ 282,100,000
Debt Instrument, Interest Rate, Effective Percentage	4.36%

Debt (Collateralized Investment

Debt (Collateralized Investment Borrowings) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt	$ 908.5	$ 909
Collateralized Investment Borrowings Due In One Year Or Less [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	$ 93.1
Debt, Weighted Average Interest Rate	2.61%
Collateralized Investment Borrowings Due After One Year To Two Years [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Two	$ 92
Debt, Weighted Average Interest Rate	2.73%
Collateralized Investment Borrowings Due After Two Year To Three Years [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Three	$ 2.6
Debt, Weighted Average Interest Rate	2.71%
Collateralized Investment Borrowings [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 187.7

Leases (Details)

Leases (Details)	Mar. 31, 2019
Minimum [Member] | Building [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Minimum [Member] | Equipment [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member] | Building [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	10 years
Maximum [Member] | Equipment [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	5 years

Leases (Lease Cost) (Details)

Leases (Lease Cost) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 0.2
Operating Lease, Cost	5.7
Short-term Lease, Cost	0.1
Operating Lease, Expense	6
Sublease Income	(0.1)
Lease, Cost	$ 5.9

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow Information) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating Lease, Payments	$ 5.2
Operating Lease, Liability Reduction	4.7
Finance Lease, Principal Payments	0.2
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 9.1

Leases (Lease Weighted Average)

Leases (Lease Weighted Average) (Details)	Mar. 31, 2019
Leases [Abstract]
Finance Lease, Weighted Average Remaining Lease Term	1 year 10 months 24 days
Operating Lease, Weighted Average Remaining Lease Term	6 years 9 months 18 days
Finance Lease, Weighted Average Discount Rate, Percent	4.00%
Operating Lease, Weighted Average Discount Rate, Percent	4.00%

Leases (Future Minimum Lease Pa

Leases (Future Minimum Lease Payments Under Capital and Operating Leases ) (Details) $ in Millions	Dec. 31, 2018USD ($)
Leases [Abstract]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	$ 0.7
Capital Leases, Future Minimum Payments Due in Two Years	0.7
Capital Leases, Future Minimum Payments Due in Three Years	0.3
Capital Leases, Future Minimum Payments Due in Four Years	0.2
Capital Leases, Future Minimum Payments Due in Five Years	0
Capital Leases, Future Minimum Payments Due Thereafter	0
Capital Leases, Future Minimum Payments Due	1.9
Capital Leases, Future Minimum Payments, Interest Included in Payments	0
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	1.9
Operating Leases, Future Minimum Payments Due, Next Twelve Months	20.5
Operating Leases, Future Minimum Payments, Due in Two Years	18.4
Operating Leases, Future Minimum Payments, Due in Three Years	16.9
Operating Leases, Future Minimum Payments, Due in Four Years	15
Operating Leases, Future Minimum Payments, Due in Five Years	12.5
Operating Leases, Future Minimum Payments, Due Thereafter	27.1
Operating Leases, Future Minimum Payments Due	$ 110.4

Income (Loss) from Continuing_2

Income (Loss) from Continuing Operations Per Unrestricted Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Income from Continuing Operations	$ 155.3	$ 53.6
Diluted Income from Continuing Operations Attributed to Unrestricted Shares	$ 154.6	$ 53.1
Weighted-Average Unrestricted Shares Outstanding (shares)	64,815,000	51,502,900
Equity-based Compensation Equivalent Shares (shares)	791,000	365,300
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution (shares)	65,606,000	51,868,200
Basic Income from Continuing Operations Per Unrestricted Share	$ 2.38	$ 1.03
Diluted Income from Continuing Operations Per Unrestricted Share	$ 2.35	$ 1.02
Common Stock [Member]
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Income from Continuing Operations	$ 154.6	$ 53.1
Participating Awards [Member]
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Income from Continuing Operations	$ 0.7	$ 0.5

Income (Loss) from Continuing_3

Income (Loss) from Continuing Operations Per Unrestricted Share (Antidilutive) (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	574,500	329,600
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	574,500	329,600

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Comprehensive Income (Loss) Before Income Taxes:
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment	$ 175.3	$ (119.5)
Reclassification Adjustment for Amounts Included in Net Income	(12.5)	(1.9)
Unrealized Holding Gains (Losses)	162.8	(121.4)
Foreign Currency Translation Adjustments	0	(0.9)
Net Unrecognized Postretirement Benefit Costs	0.6	0.3
Gain (Loss) on Cash Flow Hedges During the Period Before Reclassification Adjustment	0	0.6
Reclassification Adjustment for Amounts Included in Net Income	0.1	0.3
Gain (Loss) on Cash Flow Hedges	0.1	0.9
Other Comprehensive Income (Loss) Before Income Taxes	163.5	(121.1)
Other Comprehensive Income Tax Benefit (Expense):
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment	(36.8)	25
Reclassification Adjustment for Amounts Included in Net Income	2.6	0.4
Unrealized Holding Gains	(34.2)	25.4
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax	0	(0.2)
Gain and Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment	0	(0.1)
Reclassification Adjustment for Amounts Included in Net Income	0	(0.1)
Gain and Loss on Cash Flow Hedges	0	(0.2)
Other Comprehensive Income Tax Benefit (Expense)	34.4	(25.4)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	$ 0.2	$ 0

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings	$ 0	$ 0
Other Net Unrealized Gains on Investments	247.9	119.3
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes	(94.1)	(94.5)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(2.9)	(3)
Accumulated Other Comprehensive Income	$ 150.9	$ 21.8

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net Realized Gains on Sales of Investments	$ 16.1	$ 2.6
Net Impairment Losses Recognized in Earnings	(3.6)	(0.5)
Interest and Other Expenses	(41.4)	(29)
Total Before Income Taxes	194.7	67
Income Tax Expense	(39.4)	(13.4)
Net Income	155.3	53.8
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net Income	10.4	1.3
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net Realized Gains on Sales of Investments	16.1	2.4
Net Impairment Losses Recognized in Earnings	(3.6)	(0.5)
Total Before Income Taxes	12.5	1.9
Income Tax Expense	(2.6)	(0.4)
Net Income	9.9	1.5
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest and Other Expenses	0.6	(0.3)
Income Tax Expense	(0.2)	0.1
Net Income	0.4	(0.2)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest and Other Expenses	0.1	(0.1)
Income Tax Expense	0	0.1
Net Income	$ 0.1	$ 0

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefit that Would Not Impact Effective Tax Rate, Tax Position with Uncertain Timing of Deductibility	$ 3		$ 3.7
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0.9		$ 0.7
Income Taxes Paid, Net	$ 0	$ 4.6

Pension Benefits and Postreti_3

Pension Benefits and Postretirement Benefits Other Than Pensions (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)employees	Mar. 31, 2018USD ($)
Defined Benefit Plan Disclosure [Line Items]
Total Expense (Benefit) Recognized	$ (1.4)	$ (1.1)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Pension Plan, Number of Participants and Beneficiaries | employees	8,800
Defined Benefit Pension Plans, Number of Active Employees | employees	1,400
Service Cost	$ 0	0
Interest Cost on Projected Benefit Obligation	5.5	5.1
Expected Return on Plan Assets	(7.6)	(7.2)
Amortization of Net Actuarial Loss	$ 0.7	1
Postretirement Benefits Other than Pensions [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Postretirement Benefit Plan, Number of Retired Employees Covered | employees	700
Other Postretirement Benefit Plan, Number of Active Employees Covered | employees	600
Service Cost	$ 0.1	0
Interest Cost on Projected Benefit Obligation	0.1	0.1
Amortization of Prior Service Credit	(0.3)	(0.3)
Amortization of Net Actuarial Loss	(0.5)	(0.4)
Total Expense (Benefit) Recognized	$ (0.6)	$ (0.6)

Business Segments - Earned Prem

Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	$ 1,074.8	$ 609.8
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] | Preferred Automobile [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	115.4	104.9
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] | Homeowners [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums		61.8
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	185.6	176.8
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] | Homeowners [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	60.3
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] | Other Personal Property and Casualty Insurance [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	9.9	10.1
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	729.3
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member] | Specialty Automobile [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	669.6	266.2
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member] | Commercial Automobile [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	59.7	12.2
Operating Segments [Member] | Life and Health Insurance [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	159.9	154.6
Operating Segments [Member] | Life and Health Insurance [Member] | Life [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	95.8	93.7
Operating Segments [Member] | Life and Health Insurance [Member] | Accidental and Health [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	46.9	43.3
Operating Segments [Member] | Life and Health Insurance [Member] | Property [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Total Earned Premiums	$ 17.2	$ 17.6

Business Segments - Segment Inf

Business Segments - Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)segment	Mar. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ 123.4	$ 70.4
Number of Operating Segments | segment	3
Earned Premiums	$ 1,074.8	609.8
Net Investment Income	82.7	79.2
Other Income	1.9	1.2
Total Revenues	1,236.3	693
Income from Change in Fair Value of Equity and Convertible Securities	64.4	0.7
Net Realized Gains on Sales of Investments	16.1	2.6
Net Impairment Losses Recognized in Earnings	(3.6)	(0.5)
Other Noncash Income (Expense)	1.2	2
Total Before Income Taxes	194.7	67
Segment Net Operating Income (Loss)	98.9	57.5
Change in Fair Value of Equity and Convertible Securities	50.9	0.6
Income from Continuing Operations	155.3	53.6
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(8.6)	(5.5)
Operating Income (Loss), Net of Tax	(6.6)	(3.5)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net Realized Gains on Sales of Investments	16.1	2.6
Net Impairment Losses Recognized in Earnings	(3.6)	(0.5)
Business Combination, Acquisition Related Costs	(5.6)	(6.2)
Net Realized Gains (Losses) on Sales of Investments, Net of Tax	12.7	2.1
Net Impairment Losses Recognized in Earnings, Net of Tax	2.8	0.4
Acquisition Related Transaction, Integration and Other Costs	(4.4)	(6.2)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	132	75.9
Total Revenues	1,158.2	688.2
Income from Continuing Operations	105.5	61
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	3.3	16.6
Earned Premiums	185.6	176.8
Net Investment Income	8.3	13.7
Total Revenues	193.9	190.5
Segment Net Operating Income (Loss)	2.8	13.5
Operating Segments [Member] | Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Earned Premiums		278.4
Net Investment Income		9.9
Other Income		0.3
Total Revenues	751.6	288.6
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	99.4	29
Earned Premiums	729.3
Net Investment Income	21.5
Other Income	0.8
Operating Income (Loss), Net of Tax	79.6	23.4
Operating Segments [Member] | Life and Health Insurance [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	29.3	30.3
Earned Premiums	159.9	154.6
Net Investment Income	51.7	53.7
Other Income	1.1	0.8
Total Revenues	212.7	209.1
Segment Net Operating Income (Loss)	23.1	24.1
Homeowners [Member] | Operating Segments [Member] | Preferred Property & Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Earned Premiums	60.3
Other Personal Lines [Member] | Operating Segments [Member] | Preferred Property & Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Earned Premiums	9.9	10.1
Operating Segments [Member] | Homeowners [Member] | Preferred Property & Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Earned Premiums		61.8
Operating Segments [Member] | Preferred Automobile [Member] | Preferred Property & Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Earned Premiums	$ 115.4	$ 104.9

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value Inputs (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Inputs, Level 3 [Member] | Partnership Interest [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 138,800,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	7,523,800,000	$ 7,140,100,000
Fair Value, Measurements, Recurring [Member] | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	6,573,100,000	6,424,200,000
Fair Value, Measurements, Recurring [Member] | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	858,400,000	865,700,000
Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,681,900,000	1,619,100,000
Fair Value, Measurements, Recurring [Member] | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	5,200,000	5,900,000
Fair Value, Measurements, Recurring [Member] | Corporate Bonds and Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	3,480,100,000	3,393,800,000
Fair Value, Measurements, Recurring [Member] | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	531,500,000	524,000,000
Fair Value, Measurements, Recurring [Member] | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	16,000,000	15,700,000
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	916,900,000	684,400,000
Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	656,000,000	427,300,000
Fair Value, Measurements, Recurring [Member] | Partnership Interest [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	192,000,000	192,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	823,000,000	594,200,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	154,500,000	156,500,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	154,500,000	156,500,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bonds and Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	668,500,000	437,700,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		427,300,000
Equity, Fair Value Disclosure	656,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Partnership Interest [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	5,558,100,000	5,456,500,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	5,467,900,000	5,370,300,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	703,900,000	709,200,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,681,900,000	1,619,100,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	5,200,000	5,900,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bonds and Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	3,068,200,000	3,011,200,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	3,000,000	19,100,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	5,700,000	5,800,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	56,400,000	54,700,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Partnership Interest [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	950,700,000	897,400,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	950,700,000	897,400,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Bonds and Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	411,900,000	382,600,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	528,500,000	504,900,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	10,300,000	9,900,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Partnership Interest [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	42,700,000	41,200,000
Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	11,400,000	10,200,000
Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity Securities at Fair Value	0
Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		10,200,000
Equity, Fair Value Disclosure	11,400,000
Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		41,200,000
Equity, Fair Value Disclosure	42,700,000
Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	14,100,000	13,000,000
All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	700,000	700,000
All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	800,000
All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		200,000
Equity, Fair Value Disclosure	300,000
All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		13,000,000
Equity, Fair Value Disclosure	13,300,000
All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		500,000
Equity, Fair Value Disclosure	400,000
All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	192,000,000	192,000,000
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Investments in Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Government and Government Agencies and Authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds and Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Other Mortgage- and Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	192,000,000	192,000,000
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Fair Value, Inputs, Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Partnership Interest [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		192,000,000
Equity, Fair Value Disclosure	192,000,000
Fair Value, Inputs, Net Asset Value [Member] | Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Fair Value, Inputs, Net Asset Value [Member] | Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Fair Value, Inputs, Net Asset Value [Member] | All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		0
Equity, Fair Value Disclosure	0
Fair Value, Inputs, Net Asset Value [Member] | All Industries Other than Finance, Insurance and Real Estate [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure		$ 0
Equity, Fair Value Disclosure	$ 0

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative Information for Level Three Inputs (Details) - Market Yield [Member] - Fair Value, Inputs, Level 3 [Member] $ in Millions	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Collateralized Loan Obligations
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 528.5	$ 504.9
Other Debt Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	17.2	15.9
Debt Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	950.7	897.4
External Credit Rating, Investment Grade [Member] | Private Placement [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	169.6	146.7
External Credit Rating, Non Investment Grade [Member] | Senior Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	124.9	142.3
External Credit Rating, Non Investment Grade [Member] | Junior Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 110.5	$ 87.6
Measurement Input, Discount Rate [Member] | External Credit Rating, Investment Grade [Member] | Private Placement [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Alternative Investment, Measurement Input	0.028	0.037
Measurement Input, Discount Rate [Member] | External Credit Rating, Investment Grade [Member] | Private Placement [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Alternative Investment, Measurement Input	0.107	0.109
Measurement Input, Discount Rate [Member] | External Credit Rating, Investment Grade [Member] | Private Placement [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Alternative Investment, Measurement Input	0.046	0.052
Collateralized Loan Obligations | Measurement Input, Discount Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt Instrument, Measurement Input	0.043	0.041
Collateralized Loan Obligations | Measurement Input, Discount Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt Instrument, Measurement Input	0.125	0.134
Collateralized Loan Obligations | Measurement Input, Discount Rate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt Instrument, Measurement Input	0.058	0.061
Junior Debt [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt Instrument, Measurement Input	0.104	0.110
Junior Debt [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt Instrument, Measurement Input	0.169	0.285
Junior Debt [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt Instrument, Measurement Input	0.135	0.142
Senior Debt [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt Instrument, Measurement Input	0.046	0.048
Senior Debt [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt Instrument, Measurement Input	0.164	0.300
Senior Debt [Member] | Measurement Input, Discount Rate [Member] | External Credit Rating, Non Investment Grade [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt Instrument, Measurement Input	0.104	0.115

Fair Value Measurements - Level

Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	$ 897.4	$ 556.6
Included in Condensed Consolidated Statement of Operations	(2.8)	2.2
Included in Other Comprehensive Income (Loss)	11.9	(2.1)
Purchases	105.2	74.7
Settlements	(11.6)	(32.1)
Sales	(65.9)	(13.4)
Transfers into Level 3	16.5	0.3
Transfers out of Level 3	0	66.8
Balance at End of Period	950.7	519.4
Fair Value, Level 3 to level 2 Transfers, Amount		(5)
Bonds and Notes
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	382.6	401.5
Included in Condensed Consolidated Statement of Operations	(2.5)	1.8
Included in Other Comprehensive Income (Loss)	5.4	(1.6)
Purchases	101.3	25.8
Settlements	(11.5)	(18.1)
Sales	(65.9)	(13.4)
Transfers into Level 3	2.5	0.3
Transfers out of Level 3	0	5
Balance at End of Period	411.9	391.3
Redeemable Preferred Stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		0.1
Included in Condensed Consolidated Statement of Operations		(0.1)
Included in Other Comprehensive Income (Loss)		0
Purchases		0
Settlements		0
Sales		0
Transfers into Level 3		0
Transfers out of Level 3		0
Balance at End of Period		0
Collateralized Loan Obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	504.9	93.2
Included in Condensed Consolidated Statement of Operations	(0.3)	0.5
Included in Other Comprehensive Income (Loss)	6	(0.5)
Purchases	3.9	48.9
Settlements	0	(14)
Sales	0	0
Transfers into Level 3	14	0
Transfers out of Level 3	0	0
Balance at End of Period	528.5	128.1
Other Mortgage- and Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	9.9
Included in Condensed Consolidated Statement of Operations	0
Included in Other Comprehensive Income (Loss)	0.5
Purchases	0
Settlements	0.1
Sales	0
Transfers into Level 3	0
Transfers out of Level 3	0
Balance at End of Period	$ 10.3
Preferred and Common Stocks [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		27.4
Included in Condensed Consolidated Statement of Operations		0
Included in Other Comprehensive Income (Loss)		0
Purchases		0
Settlements		0
Sales		0
Transfers into Level 3		0
Transfers out of Level 3		(27.4)
Balance at End of Period		0
Other Equity Interests [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		34.4
Included in Condensed Consolidated Statement of Operations		0
Included in Other Comprehensive Income (Loss)		0
Purchases		0
Settlements		0
Sales		0
Transfers into Level 3		0
Transfers out of Level 3		34.4
Balance at End of Period		$ 0

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value, Balance Sheet Grouping (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, Gross, Insurance Policy	$ 301.4	$ 300.6
Short-term Investments at Cost which Approximates Fair Value	350.4	286.1
Cash and Cash Equivalents, Fair Value Disclosure	350.4	286.1
Mortgage Loans on Real Estate, Commercial and Consumer, Net	10.6	0
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2019 - $933.8; 2018 - $911.2)	908.5	909
Long-term Debt, Fair Value	933.8	911.2
Federal Home Loan Bank of Chicago [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	187.7	10	$ 10
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		10
Loans To Policyholders [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure	574.5	542.6
Mortgage Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure	$ 10.6	$ 0

Contingencies Gain Contingency

Contingencies Gain Contingency (Details) - USD ($)	Apr. 25, 2019	Sep. 26, 2018	Oct. 31, 2017
Gain Contingencies [Line Items]
Gain Contingency, Unrecorded Amount			$ 84,300,000
Litigation Settlement Interest			0.09
Litigation Settlement, Expense			$ 7,200,000
Litigation Settlement, Amount Awarded from Other Party		$ 141,700,000
Proceeds from Legal Settlements		$ 35,700,000
Subsequent Event [Member]
Gain Contingencies [Line Items]
Proceeds from Legal Settlements	$ 20,100,000

Related Parties (Details)

Related Parties (Details) - Pension Plans [Member] - Investment Management Services for Defined Benefit Plan [Member] - FS&C [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Related Party Transaction [Line Items]
Assets under Management, Carrying Amount	$ 143
Investment expenses	$ 0.2	$ 0.2

Changes in Shareholders' Equity

Changes in Shareholders' Equity Changes in Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity Attributable to Parent	$ 3,320.1
Other Comprehensive Income (Loss)	129.1	$ (95.7)
Total Comprehensive Income (Loss)	284.4	(41.9)
Cash Dividends and Dividend Equivalents to Shareholders ($0.24 per share)	(16.4)	(12.5)
Equity-based Compensation Cost	7.6	3.4
Equity-based Awards, Net of Shares Exchanged	(5.6)	(0.8)
Stockholders' Equity Attributable to Parent	3,050.1
AOCI Attributable to Parent [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 18.2
Other Comprehensive Income (Loss)	129.1	(95.7)
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (18.2)
Cash Dividends and Dividend Equivalents to Shareholders ($0.24 per share)	(16.4)	(12.5)
Equity-based Awards, Net of Shares Exchanged	$ (4.7)	$ (1.2)

Uncategorized Items - kmpr20190

Label	Element	Value
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ 2,115,600,000
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1,224,800,000
AOCI Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ 212,600,000
Common Stock [Member]
Shares, Issued	us-gaap_SharesIssued	51,500,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ 5,100,000
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ 673,100,000