Acquisitions (Schedule of Business Acquisition Pro Forma Information) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition, Pro Forma Information [Abstract]
Business acquisition, pro forma information, description	The unaudited pro forma combined financial information presented below has been prepared by adjusting the historical results of MasTec to include the historical results of the acquisitions described above. The unaudited pro forma combined historical results were then adjusted (i) to remove one-time acquisition costs; (ii) to increase amortization expense resulting from the incremental intangible assets acquired in such acquisitions; (iii) to increase interest expense as a result of the cash consideration paid; and (iv) to reduce interest expense from the repayment of acquired debt. The unaudited pro forma financial information does not include any adjustments to reflect the impact of cost savings or other synergies that may result from these acquisitions. As noted above, the unaudited pro forma financial information does not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods presented or that may be achieved by the combined company in the future.
Business acquisitions, pro forma revenue	$ 4,444.0	$ 4,201.4	$ 3,037.8
Business acquisitions, pro forma net income from continuing operations	156.4	137.5	104.2
Acquiree revenue, year over year incremental impact	406.6	170.8	258.9
Acquiree net income from continuing operations, year over year incremental impact	$ 20.0	$ 11.8	$ 10.7