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Schedule 2 - Parent Company Financial Statements - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jul. 02, 2018
5.0% Senior Notes due September 19, 2022 | Senior Notes |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Stated interest rate, percentage | 5.00% |  |
5.0% Senior Notes due September 19, 2022 | Senior Notes | Infinity Property and Casualty Corporation |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Stated interest rate, percentage |  |  | 5.00%
Subsidiary of Common Parent | Non-cash Dividends |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Related party transaction, amounts of transaction | $ 0 | $ 574,000,000 |
Subsidiary of Common Parent | Non-cash Capital Contributions |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Related party transaction, amounts of transaction | $ 0 | $ 350,000,000 |

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