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Debt - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 16, 2021 | Jun. 04, 2019 | Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 22, 2020 | Jul. 05, 2019 | Jul. 02, 2018 | Jun. 08, 2018 | Feb. 28, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 1,122,600,000 | $ 1,122,600,000 |  | $ 1,172,800,000 |  |  |  |  |
Interest and other expenses |  |  |  | 11,100,000 | $ 7,500,000 |  |  |  |  |  |
Interest paid, including capitalized interest, operating and investing activities |  |  |  | 21,700,000 | $ 17,100,000 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt | $ 50,000,000.0 |  |  |  |  |  |  |  |  |  |
Secured Debt | Term Loan due July 5, 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 50,000,000.0 |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 0 | 0 |  | 49,900,000 |  | $ 49,900,000 |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 448,900,000 | 448,900,000 |  | 448,800,000 |  |  |  |  |
Senior Notes | 5.000% Senior Notes due September 19, 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 277,900,000 | $ 277,900,000 |  | 278,300,000 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 5.00% |  |
Senior Notes | 5.000% Senior Notes due September 19, 2022 | Infinity Property and Casualty Corporation |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 275,000,000.0 |  |
Business combination, liabilities assumed, long-term debt |  |  |  |  |  |  |  |  | 282,100,000 |  |
Unamortized premium |  |  |  |  |  |  |  |  | $ 7,100,000 |  |
Effective interest rate |  |  |  |  |  |  |  |  | 4.36% |  |
Senior Notes | 4.350% Senior Notes due February 15, 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.35% | 4.35% |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 450,000,000.0 | $ 450,000,000.0 |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0
Increase in senior notes |  |  | 200,000,000.0 |  |  |  |  |  |  |  |
Senior Notes | 2.400% Senior Notes due September 30, 2030 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 395,800,000 | 395,800,000 |  | $ 395,800,000 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 2.40% |  |  |  |
Long-term debt, gross |  |  | 400,000,000.0 | 400,000,000.0 |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  | 2.52% |  |  |  |
Revolving Credit Facility | Notes Payable under Revolving Credit Agreement | Second Amended and Restated Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 400,000,000.0 |  |  |  |  |  |  |  | $ 300,000,000.0 |
Increase in revolving credit borrowing capacity |  | 100,000,000.0 |  |  |  |  |  |  |  |  |
Debt issuance costs |  | 100,000 |  |  |  |  |  |  |  |  |
Remaining unamortized costs |  | $ 800,000 |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  | $ 0 | $ 0 |  |  |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120520924&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(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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=120391452&loc=d3e13212-122682 Reference 4: 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=120398452&loc=d3e534808-122878 + Details
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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=120391452&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=120398452&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=120400017&loc=d3e572229-122910 + Details
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