Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Note 15 – Related Party Transactions MasTec purchases, rents and leases equipment and purchases various types of supplies and services used in its business, including ancillary construction services, project-related site restoration and marketing and business development activities, from a number of different vendors on a non-exclusive basis, and from time to time, rents equipment to, sells certain supplies, or performs construction services on behalf of, entities in which members of subsidiary management have ownership or commercial interests. For the years ended December 31, 2020, 2019 and 2018, such payments to related party entities totaled approximately $80.9 million, $108.0 million and $134.4 million, respectively. Payables associated with such arrangements totaled approximately $8.9 million and $14.7 million as of December 31, 2020 and 2019, respectively. Revenue from such related party arrangements totaled approximately $4.1 million, $2.3 million and $10.3 million for the years ended December 31, 2020, 2019 and 2018. Related amounts receivable, net, as of December 31, 2020 totaled approximately $0.5 million, and as of December 31, 2019, were de minimis. In 2018, MasTec acquired a construction management firm specializing in steel building systems, of which Juan Carlos Mas, who is the brother of Jorge Mas, Chairman of MasTec’s Board of Directors, and José R. Mas, MasTec’s Chief Executive Officer, was a minority owner, for approximately $6.1 million in cash and an estimated earn-out liability of approximately $1.4 million, net, as adjusted. Amounts outstanding for advances made by the Company on behalf of this entity, net, totaled approximately $0.1 million and $0.5 million as of December 31, 2020 and 2019, respectively, which are expected to be settled under customary terms associated with the related purchase agreement. The Company rents and leases equipment and purchases equipment supplies and servicing from CCI. Juan Carlos Mas serves as the chairman of CCI, and a member of management of a MasTec subsidiary and an entity that is owned by the Mas family are minority owners. For the years ended December 31, 2020, 2019 and 2018, MasTec paid CCI $6.8 million, $41.7 million and $57.6 million, net of rebates, respectively, related to this activity. Amounts payable to CCI, net of rebates receivable, totaled approximately $4.2 million and $0.2 million as of December 31, 2020 and 2019, respectively. The Company has also rented equipment to CCI. Revenue from equipment rentals to CCI totaled approximately $0.9 million for the year ended December 31, 2020, for which the related receivables were de minimis as of December 31, 2020. MasTec has a subcontracting arrangement with an entity for the performance of construction services, the minority owners of which include an entity controlled by Jorge Mas and José R. Mas, along with two members of management of a MasTec subsidiary. For the years ended December 31, 2020, 2019 and 2018, MasTec incurred subcontracting expenses of approximately $1.9 million, $10.3 million and $9.9 million, respectively, under these arrangements. As of December 31, 2020 and 2019, related amounts payable totaled approximately $1.4 million and $0.2 million, respectively. MasTec has a leasing arrangement for an aircraft that is owned by an entity that Jorge Mas owns. For the years ended December 31, 2020, 2019 and 2018, MasTec paid approximately $2.6 million, $2.4 million and $2.7 million, respectively, related to this leasing arrangement. MasTec performs construction services on behalf of a professional Miami soccer franchise (the “Franchise”) in which Jorge Mas and José R. Mas are minority owners. Services provided by MasTec include the construction of a soccer facility and stadium as well as wireless infrastructure services. For the years ended December 31, 2020 and 2019, MasTec charged approximately $7.1 million and $12.6 million under these arrangements, respectively. Amounts outstanding as of December 31, 2020 were de minimis, and as of December 31, 2019, totaled approximately $3.9 million. Payments for other expenses related to the Franchise totaled $0.3 million for the year ended December 31, 2020, and as of December 31, 2020, there were no amounts outstanding. MasTec leases employees and provides satellite communications services to a customer in which Jorge Mas and José R. Mas own a majority interest. For the years ended December 31, 2020, 2019 and 2018, charges to this customer totaled approximately $1.3 million, $1.4 million and $1.7 million, respectively, related to these arrangements. As of December 31, 2020 and 2019, outstanding receivables totaled approximately $0.9 million and $0.8 million, respectively. The Company has a 25% interest in an entity associated with an acquisition, under which the acquired business and the entity have a subcontracting arrangement. The Company’s interest in this entity is accounted for as an equity method investment. For the year ended December 31, 2020, MasTec received payments totaling approximately $0.4 million from this investee, and as of December 31, 2020, the Company’s net investment in this entity was a liability of approximately $2.0 million, which net amount includes approximately $1.9 million of accounts receivable, net, less deferred revenue, related to the subcontracting arrangement. Additionally, the Company has a strategic arrangement with an entity associated with a separate acquisition, in which members of management of the acquired business have an ownership interest. For the year ended December 31, 2020, approximately $0.9 million of income and recovery of costs was recognized in connection with this arrangement, and as of December 31, 2020, amounts receivable totaled $0.4 million. In addition, for the year ended December 31, 2020, the Company advanced $1.2 million on behalf of this entity, which amount was collected as of December 31, 2020. One of the Company’s subsidiaries has a subcontracting arrangement with a contractual joint venture in which it holds a 35% undivided interest, for which the related project was complete as of December 31, 2020. Outstanding performance guarantees on behalf of this contractual joint venture totaled Canadian $26.4 million as of both December 31, 2020 and 2019, or approximately $20.7 million and $20.3 million, respectively. Non-controlling interests in entities consolidated by the Company represent ownership interests held by members of management of certain of the Company’s subsidiaries, primarily in the Company’s Oil and Gas segment. Split Dollar Agreements MasTec has an amended and restated split dollar life insurance agreement with (i) Jorge Mas, and José R. Mas and Juan Carlos Mas, as trustees of the Jorge Mas Irrevocable Trust (the “Jorge Mas trust”); and (ii) José R. Mas, and Jorge Mas, Juan Carlos Mas and Patricia Mas, as trustees of the José Ramon Mas Irrevocable Trust (the “José R. Mas trust”). The Company is the sole owner of each of the policies and is designated as the named fiduciary under each split dollar agreement, and the policies subject to the split dollar agreement may not be surrendered without the express written consent of the applicable trust. The total maximum face amount of the insurance policies subject to the split dollar agreements is capped at $200 million in the case of Jorge Mas and $75 million in the case of José R. Mas. Upon the death of the applicable executive or the survivor of the applicable executive and his wife, the Company is entitled to receive a portion of the death benefit under the policy equal to the greater of (i) premiums paid by the Company on the policy and (ii) the then cash value of the policy (excluding surrender charges or other similar charges or reductions) immediately before the triggering death. In addition, each executive is entitled to purchase the applicable policy under certain events, including a change in control of the Company. The Company paid approximately $1.1 million in each of the years ended December 31, 2020, 2019 and 2018 in connection with the split dollar agreements for Jorge Mas, and paid approximately $0.7 million in each of the years ended December 31, 2020, 2019 and 2018 in connection with the split dollar agreements for José R. Mas. Life insurance assets associated with these agreements, which amounts are included within other long-term assets, totaled approximately $22.2 million and $20.3 million as of December 31, 2020 and 2019, respectively.