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Employee Benefit Plans (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) employee | Dec. 31, 2022 USD ($) employee | Dec. 31, 2021 USD ($)
Employee Benefit Plans |  |  |
Percentage of contributions of covered employees' salaries or wages | 2.50% |  |
Contribution | $ 22.9 | $ 19.8 | $ 16.1
Amount payable to plan | $ 0.5 |  |
Number of employees who are union members | employee | 7 | 12 |
Contributions made to multi-employer pension plans | $ 0.0 | $ 0.0 | $ 0.0
Period in which certain individuals are entitled to fixed annual payments | 15 years |  |
Maximum age under which certain individuals are entitled to fixed annual payments | 65 years |  |
Portion of benefits vesting after ten years of completed service (as a percent) | 50.00% |  |
Period of completed service over which 50% of benefits are vested | 10 years |  |
Portion of benefits vesting after fifteen years of completed service (as a percent) | 75.00% |  |
Period of completed service over which 75% of benefits are vested | 15 years |  |
Period of service over which benefits are fully vested | 20 years |  |
Unfunded benefit liability | $ 3.5 | $ 3.7 |

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