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Other Retirement Plans | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Other Retirement Plans | Other Retirement Plans Multiemployer Plans. Certain of MasTec’s subsidiaries contribute amounts to multiemployer pension and other multiemployer benefit plans and trusts (“MEPPs”). Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. Multiemployer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at a given time, and the plans in which they participate, vary depending upon the location and number of ongoing projects and the need for union resources in connection with those projects. 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 |
The fluctuations in the number of employees covered under multiemployer plans and related contributions in the table above related to the timing of activity for the Company’s union resource-based projects, the majority of which are within its oil and gas operations, as well as the effect of the Company’s 2021 acquisitions.

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