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Stock Based Compensation - Stock Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 60 Months Ended | 86 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | May 06, 2015 | Jun. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Options granted (in shares) |  |  | 296,100 |  |  |
Intrinsic value of options |  |  | $ 5.0 | $ 7.3 |  |
RLI Corp. Long-Term Incentive Plan (2010 LTIP) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized for grant |  |  |  |  | 4,000,000 |
Options granted (in shares) |  |  |  |  | 2,878,000 |
RLI Corp. Long-Term Incentive Plan (2015 LTIP) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized for grant | 4,000,000 |  | 4,000,000 |  |  | 4,000,000
Options granted (in shares) |  |  | 312,805 |  |  | 3,213,225
Stock-based compensation expenses | $ 2.3 | $ 1.7 | $ 3.7 | 3.2 |  |
Income tax benefit from stock-based compensation | 0.4 | $ 0.3 | 0.6 | $ 0.5 |  |
Unrecognized stock-based compensation expense | $ 10.1 |  | $ 10.1 |  |  | $ 10.1
Stock-based compensation expenses, recognition period |  |  | 2 years 3 months 7 days |  |  |
RLI Corp. Long-Term Incentive Plan (LTIP 2010 and LTIP 2015) | Stock Options |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 5 years |  |  |
Term of options |  |  | 8 years |  |  |
Age and period of service of the participant to be eligible for retirement |  |  | 75 years |  |  |

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- Definition Represents the participant's age and period of service to be considered retirement eligible under the plan. + References No definition available. + Details
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