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v3.21.2

Other Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Schedule of Covered Employees and Contributions, Multiemployer Plans | Total contributions to multiemployer plans and the related number of employees covered by these plans for the periods indicated were as follows:
| Multiemployer Plans
| Covered Employees |  | Contributions (in millions)
| Low |  | High |  | Pension |  | Other Multiemployer |  | Total
For the Three Months Ended June 30: |  |  |  |  |  |  |  |  |
2021 | 2,532 |  |  | 6,979 |  |  | $ | 21.7 |  |  | $ | 8.0 |  |  | $ | 29.7 |
2020 | 1,424 |  |  | 1,469 |  |  | $ | 6.9 |  |  | $ | 2.1 |  |  | $ | 9.0 |
For the Six Months Ended June 30: |  |  |  |  |  |  |  |  |
2021 | 2,412 |  |  | 6,979 |  |  | $ | 44.2 |  |  | $ | 10.2 |  |  | $ | 54.4 |
2020 | 1,119 |  |  | 1,469 |  |  | $ | 12.3 |  |  | $ | 3.8 |  |  | $ | 16.1 |

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