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Segments and Related Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of Financial Information by Reportable Segment
Summarized financial information for MasTec’s reportable segments is presented and reconciled to consolidated financial information for total MasTec in the following tables (in millions):
 
For the Three Months Ended September 30
 
For the Nine Months Ended September 30
Revenue:
2017
 
2016
 
2017
 
2016
Communications (a)
$
610.5

 
$
624.3

 
$
1,762.2

 
$
1,728.0

Oil and Gas
1,161.0

 
736.0

 
2,757.2

 
1,454.3

Electrical Transmission
81.8

 
101.7

 
277.3

 
283.6

Power Generation and Industrial
96.9

 
123.6

 
204.1

 
324.7

Other
10.6

 
7.6

 
14.2

 
14.9

Eliminations
(5.0
)
 
(7.0
)
 
(10.9
)
 
(12.7
)
Consolidated revenue
$
1,955.8

 
$
1,586.2

 
$
5,004.1

 
$
3,792.8

(a)
Revenue generated primarily by utilities customers represented 13.0% and 11.1% of Communications segment revenue for the three month periods ended September 30, 2017 and 2016, respectively, and represented 12.6% and 10.9% for the nine month periods ended September 30, 2017 and 2016, respectively.
 
For the Three Months Ended September 30
 
For the Nine Months Ended September 30
EBITDA:
2017
 
2016
 
2017
 
2016
Communications
$
65.3

 
$
62.8

 
$
173.2

 
$
190.9

Oil and Gas
108.1

 
117.8

 
356.1

 
187.6

Electrical Transmission
4.5

 
(8.3
)
 
11.2

 
(42.0
)
Power Generation and Industrial
9.3

 
6.1

 
14.8

 
13.8

Other
10.1

 
(3.1
)
 
11.6

 
(2.6
)
Corporate
(22.0
)
 
(24.3
)
 
(69.2
)
 
(55.1
)
Consolidated EBITDA
$
175.3

 
$
151.0

 
$
497.7

 
$
292.6


 
For the Three Months Ended September 30
 
For the Nine Months Ended September 30
Depreciation and Amortization:
2017
 
2016
 
2017
 
2016
Communications
$
13.8

 
$
12.5

 
$
39.4

 
$
37.2

Oil and Gas
26.0

 
20.7

 
71.1

 
58.2

Electrical Transmission
5.8

 
6.1

 
17.3

 
17.1

Power Generation and Industrial
2.9

 
1.6

 
5.8

 
4.6

Other
0.0

 
0.0

 
0.1

 
0.0

Corporate
1.6

 
1.7

 
4.7

 
5.1

Consolidated depreciation and amortization
$
50.1

 
$
42.6

 
$
138.4

 
$
122.2
Reconciliation of Consolidated Income before Income Taxes to EBITDA
The following table, which may contain slight summation differences due to rounding, presents a reconciliation of consolidated income before income taxes to EBITDA (in millions):
 
For the Three Months Ended September 30
 
For the Nine Months Ended September 30
EBITDA Reconciliation:
2017
 
2016
 
2017
 
2016
Income before income taxes
$
107.6

 
$
95.3

 
$
314.3

 
$
132.4

Plus:
 
 
 
 
 
 
 
Interest expense, net
17.6

 
13.1

 
45.0

 
37.9

Depreciation and amortization
50.1

 
42.6

 
138.4

 
122.2

Consolidated EBITDA
$
175.3

 
$
151.0

 
$
497.7

 
$
292.6
Schedule of Significant Customers, Revenue Concentration Information
Revenue concentration information for significant customers as a percentage of total consolidated revenue was as follows:
 
For the Three Months Ended September 30
 
For the Nine Months Ended September 30
Customer:
2017
 
2016
 
2017
 
2016
Energy Transfer affiliates (a)
49%
 
35%
 
40%
 
26%
AT&T (including DIRECTV®) (b)
21%
 
30%
 
25%
 
34%

(a)
The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., and their subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.
(b)
The Company’s relationship with AT&T is based upon multiple separate master service and other service agreements, including for installation and maintenance services, as well as construction/installation contracts for AT&T’s: (i) wireless business; (ii) wireline/fiber businesses; and (iii) various install-to-the-home businesses, including DIRECTV®. Revenue from AT&T is included in the Communications segment.