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Debt - Narrative (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 07, 2019 | Jun. 04, 2019 | Dec. 28, 2018 | Jun. 29, 2018 | May 31, 2019 | Jun. 30, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 05, 2019 | Dec. 31, 2018 | Jul. 02, 2018 | Jun. 08, 2018 | Mar. 31, 2018 | Feb. 28, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 215,000,000.0 |  | $ 35,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | $ 778,700,000 |  | $ 778,700,000 |  |  | $ 909,000,000.0 |  |  |  |
Loss from Early Extinguishment of Debt |  |  |  |  |  |  | 5,800,000 | $ 0 | 5,800,000 | $ 0 |  |  |  |  |  |
Collateralized Investment Borrowings |  |  |  |  |  |  | 137,600,000 |  | 137,600,000 |  |  | 10,000,000.0 |  |  |  |
Interest and other expenses |  |  |  |  |  |  | 9,200,000 | 13,400,000 | 32,500,000 | 29,300,000 |  |  |  |  |  |
Interest paid, including capitalized interest, operating and investing activities |  |  |  |  |  |  | 18,900,000 | $ 19,700,000 | 43,000,000.0 | $ 35,000,000.0 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  | $ 249,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | 5.0% Senior Notes due September 19, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 50,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | 49,900,000 |  | 49,900,000 |  | $ 49,900,000 | 0 |  |  |  |
Senior Notes | 5.0% Senior Notes due September 19, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  | 281,500,000 |  |  |  |
Senior Notes | 4.35% Senior Notes due February 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | $ 448,500,000 |  | $ 448,500,000 |  |  | 448,400,000 |  |  |  |
Stated interest rate |  |  |  |  |  |  | 4.35% |  | 4.35% |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0
Increase in senior notes |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |
Subordinated Debt | 7.375% Subordinated Debentures due February 27, 2054 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  | 144,200,000 |  |  |  |
Stated interest rate | 7.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross | $ 150,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Infinity Property and Casualty Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, liabilities assumed, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 282,100,000 |  |  |
Infinity Property and Casualty Corporation | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred, liabilities incurred |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Infinity Property and Casualty Corporation | Senior Notes | 5.0% Senior Notes due September 19, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | 280,300,000 |  | 280,300,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000.0 |  |  |
Business combination, liabilities assumed, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | 282,100,000 |  |  |
Unamortized premium |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,100,000 |  |  |
Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.36% |  |  |
Revolving Credit Facility | Notes Payable under Revolving Credit Agreement | Second Amended and Restated Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 400,000,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000.0 |  |
Increase in revolving credit borrowing capacity |  | 100,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining unamortized costs |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  |  |  | 0 |  | 0 |  |  | 0 |  |  |  |
Federal Home Loan Bank of Chicago |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Investment Borrowings |  |  |  |  |  |  | 137,600,000 |  | 137,600,000 |  |  | 10,000,000.0 |  |  |  |
United Insurance Company of America | Federal Home Loan Bank of Chicago |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | 137,600,000 |  | 137,600,000 |  |  |  |  |  |  |
Federal Home Loan Bank stock |  |  |  |  |  |  | 2,800,000 |  | 2,800,000 |  |  | 800,000 |  |  |  |
Federal Home Loan Bank, amount of advances |  |  |  |  |  |  | 385,600,000 |  | 385,600,000 |  |  |  |  |  | $ 10,000,000.0 |
Collateral amount |  |  |  |  |  |  | 184,100,000 |  | 184,100,000 |  |  | 15,700,000 |  |  |  |
Repayment of collateralized investment borrowings |  |  |  |  |  |  |  |  | 247,900,000 |  |  |  |  |  |  |
Collateralized Investment Borrowings |  |  |  |  |  |  | 137,600,000 |  | 137,600,000 |  |  |  |  |  |  |
Trinity Universal Insurance Company | Federal Home Loan Bank of Dallas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank stock |  |  |  |  |  |  | $ 3,300,000 |  | $ 3,300,000 |  |  | $ 3,300,000 |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for repayment of Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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