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Employee Benefit Plans (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($)
Employee Benefit Plans |  |  |
Percentage of contributions of covered employees' salaries or wages | 2.50% |  |
Contribution | $ 16.3 | $ 14.2 | $ 10.8
Amount payable to plan | $ 0.5 | $ 0.3 |
Number of employees who are union members | item | 6 | 7 |
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 | $ 4.0 | $ 4.1 |

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- Definition Represents the period in which certain individuals are entitled to fixed annual payments. + References No definition available. + Details
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- Definition Represents the period of completed service over which 50 percent of benefits are vested. + References No definition available. + Details
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- Definition Represents the period of completed service over which 75 percent of benefits are vested. + References No definition available. + Details
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- Definition Represents the period of service over which benefits are fully vested. + References No definition available. + Details
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- Definition Represents the portion of benefits vesting after fifteen years of completed service. + References No definition available. + Details
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- Definition Represents the portion of benefits vesting after ten years of completed service. + References No definition available. + Details
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- Definition Represents the amount payable to defined contribution plan. + References No definition available. + Details
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- Definition Represents the number of employees who are union members and have participated in the multi-employer pension plans. + References No definition available. + Details
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