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Employee Retirement and Benefit Plans - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) employee plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |
Number of defined contributions benefit plan | plan | 2 |  |
Defined contribution plan, maximum annual contributions per employee, percent | 75.00% |  |
Defined benefit plan, contributions by employer | $ 0.6 | $ 0.6 | $ 0.2
Defined contribution plan, employers matching contribution, vesting period | 5 years |  |
Total contributions for multiemployer pension and benefit plans |  | 5.00% |
Pension Plans | American Acquisition |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Number of employees participating in multiemployer benefit and pension plans | employee | 1,800 |  |
Expenses related multiemployer health and welfare and defined benefit pension plans | $ 7.1 | $ 11.8 | $ 11.0

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