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v3.21.2

Other Retirement Plans (Tables) | 9 Months Ended
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Sep. 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 September 30: |  |  |  |  |  |  |  |  |
2021 | 5,116 |  |  | 6,979 |  |  | $ | 36.9 |  |  | $ | 11.7 |  |  | $ | 48.6 |
2020 | 1,452 |  |  | 1,469 |  |  | $ | 7.2 |  |  | $ | 1.7 |  |  | $ | 8.9 |
For the Nine Months Ended September 30: |  |  |  |  |  |  |  |  |
2021 | 2,412 |  |  | 6,979 |  |  | $ | 81.1 |  |  | $ | 21.9 |  |  | $ | 103.0 |
2020 | 1,119 |  |  | 1,469 |  |  | $ | 19.5 |  |  | $ | 5.5 |  |  | $ | 25.0 |

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