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Acquisition of Business - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 23, 2020 USD ($) | Dec. 28, 2018 USD ($) | Jul. 13, 2018 USD ($) | Jul. 02, 2018 USD ($) $ / shares shares | Jun. 29, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) agent | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  |  | $ 304.8 | $ 383.6 | $ 2.5
Repayments of debt |  | $ 215.0 |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,114.0 | 1,114.0 |
Current Fiscal Year End Date |  |  |  |  |  | --12-31 |  |
American Access Casualty Company |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total consideration transferred | $ 370.0 |  |  |  |  |  |  |
Direct premiums written |  |  |  |  |  |  | $ 370.0 |
Number of independent agents | agent |  |  |  |  |  |  | 500 |
Number of captive agents | agent |  |  |  |  |  |  | 110 |
Infinity Property and Casualty Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  | $ 1,500.0 |  |  |  |
Percentage of voting interests acquired |  |  |  | 100.00% |  |  |  |
Business acquisition, interest issued (in shares) | shares |  |  |  | 13,184,107 |  |  |  |
Business acquisition, fair value of interests issued |  |  |  | $ 982.5 |  |  |  |
Share price | $ / shares |  |  |  | $ 74.53 |  |  |  |
Cash consideration |  |  |  | $ 564.6 |  |  |  |
Assumed legal and tax accruals |  |  |  |  |  |  | $ 1.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  |  |  | 10.8 |  |  |  |
Increase current income taxes assets |  |  |  | 1.0 |  |  | 0.2 |
Goodwill |  |  |  | 791.0 |  |  | $ 1.6 |
Secured Debt | Infinity Property and Casualty Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  |  | $ 110.0 | $ 250.0 |  |  |
Repayments of secured debt |  |  | $ 110.0 |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, interest issued (in shares) | shares |  |  |  | 44,010 |  |  |  |
Restricted Stock Units (RSUs) | Infinity Property and Casualty Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, fair value of interests issued |  |  |  | $ 3.3 |  |  |  |
Consideration related to pre-close activities |  |  |  | 1.6 |  |  |  |
Consideration related to future services |  |  |  | $ 1.7 |  |  |  |

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