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Segments and Related Information (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Schedule of Financial Information by Reportable Segment
 
For the Three Months Ended March 31
Revenue:
2018
 
2017
Communications (a)
$
627.1

 
$
559.5

Oil and Gas
536.5

 
455.9

Electrical Transmission
114.0

 
98.8

Power Generation and Industrial
117.6

 
46.6

Other
1.9

 
1.7

Eliminations
(0.3
)
 
(4.3
)
Consolidated revenue
$
1,396.8

 
$
1,158.2

(a)
Revenue generated primarily by utilities customers represented 17.8% and 13.4% of Communications segment revenue for the three month periods ended March 31, 2018 and 2017, respectively.
 
For the Three Months Ended March 31
EBITDA:
2018
 
2017
Communications
$
82.1

 
$
48.4

Oil and Gas
33.0

 
93.9

Electrical Transmission
4.6

 
3.2

Power Generation and Industrial
4.8

 
0.8

Other
5.9

 
(5.3
)
Corporate
(25.8
)
 
(17.5
)
Consolidated EBITDA
$
104.6

 
$
123.5


 
For the Three Months Ended March 31
Depreciation and Amortization:
2018
 
2017
Communications
$
14.6

 
$
12.0

Oil and Gas
25.5

 
21.9

Electrical Transmission
5.3

 
5.8

Power Generation and Industrial
3.0

 
1.5

Other
0.0

 
0.0

Corporate
1.5

 
1.7

Consolidated depreciation and amortization
$
49.9

 
$
42.9
Reconciliation of Consolidated Income before Income Taxes to EBITDA

 
For the Three Months Ended March 31
EBITDA Reconciliation:
2018
 
2017
Income before income taxes
$
37.6

 
$
68.0

Plus:
 
 
 
Interest expense, net
17.1

 
12.6

Depreciation and amortization
49.9

 
42.9

Consolidated EBITDA
$
104.6

 
$
123.5
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 March 31
Customer:
2018
 
2017
AT&T (including DIRECTV®) (a)
27%
 
36%
Energy Transfer affiliates (b)
26%
 
17%

(a)
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.
(b)
The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., and its 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.