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SEGMENT INFORMATION (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Financial information of reportable segments
The following tables show summarized financial information related to our reportable segments for the three months ended March 31, 2018 and 2017:
 
 
Utility Operations
 
 
 
 
 
 
 
 
 
 
(in millions)
 
Wisconsin
 
Illinois
 
Other States
 
Total Utility
Operations
 
Electric Transmission
 
Non-Utility Energy Infrastructure
 
Corporate
and Other
 
Reconciling
Eliminations
 
WEC Energy Group Consolidated
Three Months Ended
 
 

 
 

 
 
 
 

 
 
 
 
 
 

 
 

 
 

March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
1,589.1

 
$
507.3

 
$
169.9

 
$
2,266.3

 
$
—

 
$
18.8

 
$
1.4

 
$
—

 
$
2,286.5

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
99.3

 
—

 
(99.3
)
 
—

Other operation and maintenance
 
468.5

 
112.2

 
26.6

 
607.3

 
—

 
1.7

 
(0.3
)
 
(96.8
)
 
511.9

Depreciation and amortization
 
135.1

 
40.9

 
6.6

 
182.6

 
—

 
18.3

 
7.7

 
—

 
208.6

Operating income (loss)
 
273.7

 
147.6

 
36.2

 
457.5

 
—

 
93.0

 
(5.4
)
 
—

 
545.1

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
32.8

 
—

 
—

 
—

 
32.8

Interest expense
 
49.4

 
12.3

 
2.1

 
63.8

 
—

 
16.1

 
28.0

 
(1.2
)
 
106.7


 
 
Utility Operations
 
 
 
 
 
 
 
 
 
 
(in millions)
 
Wisconsin
 
Illinois
 
Other States
 
Total Utility
Operations
 
Electric Transmission
 
Non-Utility Energy Infrastructure
 
Corporate
and Other
 
Reconciling
Eliminations
 
WEC Energy Group Consolidated
Three Months Ended
 
 

 
 

 
 
 
 

 
 
 
 
 
 

 
 

 
 

March 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
1,612.1

 
$
525.3

 
$
157.9

 
$
2,295.3

 
$
—

 
$
6.3

 
$
2.9

 
$
—

 
$
2,304.5

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
109.0

 
—

 
(109.0
)
 
—

Other operation and maintenance *
 
465.7

 
119.6

 
28.2

 
613.5

 
—

 
0.4

 
(0.4
)
 
(109.0
)
 
504.5

Depreciation and amortization
 
129.3

 
36.2

 
6.0

 
171.5

 
—

 
17.5

 
5.6

 
—

 
194.6

Operating income (loss) *
 
329.5

 
156.7

 
33.5

 
519.7

 
—

 
97.4

 
(2.4
)
 
—

 
614.7

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
41.9

 
—

 
—

 
—

 
41.9

Interest expense
 
48.7

 
11.1

 
2.3

 
62.1

 
—

 
15.3

 
29.1

 
(1.8
)
 
104.7



*
Includes the retroactive restatement impacts of the implementation of ASU 2017-07. See Note 14, Employee Benefits, for more information on this new standard.