Other Retirement Plans

9 Months Ended

Sep. 30, 2023

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 are 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:
2023	7,760	11,025	$	34.8	$	15.2	$	50.0
2022	6,774	7,136	$	23.0	$	14.5	$	37.5
For the Nine Months Ended September 30:
2023	6,806	11,025	$	77.9	$	45.1	$	123.0
2022	6,601	7,136	$	62.3	$	41.6	$	103.9

The fluctuations in the number of employees covered under multiemployer plans and associated contributions in the table above related primarily to the timing of activity for the Company’s union resource-based projects, as well as the effects of the Company’s recent acquisitions. For the three and nine month periods ended September 30, 2023, multiemployer plan activity was driven primarily by project work within the Company’s Power Delivery and Oil and Gas operations, and, to a lesser extent, by acquisition-related project work within the Company’s Clean Energy and Infrastructure operations, whereas for the three and nine month periods ended September 30, 2022, activity was driven primarily by acquisition-related project work within the Company’s Power Delivery operations, and, to a lesser extent, project work within its Oil and Gas operations.