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Schedule 2 - Parent Company Financial Statements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jul. 02, 2018
5.000% 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	$ 189.0	$ 106.0
Parent Company | Non-cash Capital Contributions
Condensed Financial Statements, Captions [Line Items]
Related party transaction, amounts of transaction	$ 103.3

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