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v3.22.2.2

Debt - Long Term Debt (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Mar. 10, 2022 | Feb. 15, 2022 | Dec. 31, 2021 | Sep. 22, 2020 | Jul. 02, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | $ 1,386.4 |  |  | $ 1,121.9 |  |
Derivative, Gain (Loss) on Derivative, Net | 0.5 |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0.4 |  |  |  |  |
2.400% Senior Notes due September 30, 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt |  |  |  |  | $ 395.8 |
Senior Notes, 3.800 Percent Due February 23, 2033 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt |  |  | $ 395.1 |  |  |
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt |  | $ 144.7 |  |  |  |
Senior Notes | 5.000% Senior Notes due September 19, 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | 0.0 |  |  | 276.7 |  |
Stated interest rate |  |  |  |  |  | 5.00%
Senior Notes | 5.000% Senior Notes due September 19, 2022 | Infinity Property and Casualty Corporation |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Business combination, liabilities assumed, long-term debt |  |  |  |  |  | $ 282.1
Senior Notes | 4.350% Senior Notes due February 15, 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | $ 449.3 |  |  | 449.0 |  |
Stated interest rate | 4.35% |  |  |  |  |
Senior Notes | 2.400% Senior Notes due September 30, 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | $ 396.5 |  |  | 396.2 |  |
Stated interest rate |  |  |  |  | 2.40% |
Senior Notes | Senior Notes, 3.800 Percent Due February 23, 2033 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | 395.3 |  |  | 0.0 |  |
Stated interest rate |  |  | 3.80% |  |  |
Senior Notes | Senior Notes, 5.875 Percent Due March 15, 2062 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | $ 145.3 |  |  | $ 0.0 |  |
Junior Debt | Senior Notes, 5.875 Percent Due March 15, 2062 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  | 5.875% |  |  |  |

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