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Acquisition of Business - Narrative (Details) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 28, 2018 | Jul. 13, 2018 | Jul. 02, 2018 | Jun. 29, 2018 | May 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  |  | $ 383,600,000 | $ 2,500,000 | $ 2,900,000
Repayments of debt | $ 215,000,000.0 |  |  |  | $ 35,000,000.0 |  |  |
Goodwill |  |  |  |  |  | 1,114,000,000.0 | $ 1,112,400,000 |
Infinity Property and Casualty Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 100.00% |  |  |  |  |
Total consideration transferred |  |  | $ 1,500,000,000 |  |  |  |  |
Business acquisition, interest issued (in shares) |  |  | 13,184,107 |  |  |  |  |
Business acquisition, fair value of interests issued |  |  | $ 982,500,000 |  |  |  |  |
Share price |  |  | $ 74.53 |  |  |  |  |
Cash consideration |  |  | $ 564,600,000 |  |  |  |  |
Assumed legal and tax accruals |  |  |  |  |  | 1,800,000 |  |
Acquired current income tax assets |  |  |  |  |  | 200,000 |  |
Goodwill |  |  | 791,000,000.0 |  |  | $ 1,600,000 |  |
Secured Debt | Infinity Property and Casualty Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  | $ 110,000,000.0 | $ 250,000,000.0 |  |  |  |
Repayments of secured debt |  | $ 110,000,000.0 |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, interest issued (in shares) |  |  | 44,010 |  |  |  |  |
Restricted Stock Units (RSUs) | Infinity Property and Casualty Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, fair value of interests issued |  |  | $ 3,300,000 |  |  |  |  |
Consideration related to pre-close activities |  |  | 1,600,000 |  |  |  |  |
Consideration related to future services |  |  | $ 1,700,000 |  |  |  |  |

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