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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Schedule of information concerning our reportable segments
The following tables show summarized financial information related to our reportable segments for the years ended December 31, 2017, 2016, and 2015.
 
 
Utility Operations
 
 
 
 
 
 
 
 
 
 
2017 (in millions)
 
Wisconsin
 
Illinois
 
Other States
 
Total Utility
Operations
 
Electric Transmission
 
Non-Utility Energy Infrastructure
 
Corporate and Other
 
Reconciling
Eliminations
 
WEC Energy Group Consolidated
External revenues
 
$
5,829.2

 
$
1,355.5

 
$
411.2

 
$
7,595.9

 
$
—

 
$
38.9

 
$
13.7

 
$
—

 
$
7,648.5

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
446.3

 
—

 
(446.3
)
 
—

Other operation and maintenance
 
1,912.5

 
471.1

 
101.3

 
2,484.9

 
—

 
7.3

 
(4.1
)
 
(441.1
)
 
2,047.0

Depreciation and amortization
 
523.9

 
152.6

 
24.8

 
701.3

 
—

 
71.4

 
25.9

 
—

 
798.6

Operating income (loss)
 
1,065.9

 
273.0

 
54.2

 
1,393.1

 
—

 
400.5

 
(8.4
)
 
—

 
1,785.2

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
154.3

 
—

 
—

 
—

 
154.3

Interest expense
 
193.7

 
45.0

 
8.7

 
247.4

 
—

 
62.8

 
107.3

 
(1.8
)
 
415.7

Capital expenditures
 
1,152.3

 
545.2

 
74.5

 
1,772.0

 
—

 
35.4

 
152.1

 
—

 
1,959.5

Total assets *
 
22,237.1

 
6,144.7

 
1,067.8

 
29,449.6

 
1,593.4

 
2,992.8

 
953.6

 
(3,398.9
)
 
31,590.5


*
Total assets at December 31, 2017 reflect an elimination of $2,038.1 million for all lease activity between We Power and WE.
 
 
Utility Operations
 
 
 
 
 
 
 
 
 
 
2016 (in millions)
 
Wisconsin
 
Illinois
 
Other States
 
Total Utility
Operations
 
Electric Transmission
 
Non-Utility Energy Infrastructure
 
Corporate and Other
 
Reconciling
Eliminations
 
WEC Energy Group Consolidated
External revenues
 
$
5,805.4

 
$
1,242.2

 
$
376.5

 
$
7,424.1

 
$
—

 
$
24.9

 
$
23.3

 
$
—

 
$
7,472.3

Intersegment revenues
 
0.3

 
—

 
—

 
0.3

 
—

 
423.3

 
—

 
(423.6
)
 
—

Other operation and maintenance
 
2,025.4

 
485.1

 
110.1

 
2,620.6

 
—

 
4.3

 
(15.8
)
 
(423.6
)
 
2,185.5

Depreciation and amortization
 
496.6

 
134.0

 
21.1

 
651.7

 
—

 
68.3

 
42.6

 
—

 
762.6

Operating income (loss)
 
1,027.0

 
239.6

 
49.9

 
1,316.5

 
—

 
375.6

 
(10.0
)
 
—

 
1,682.1

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
146.5

 
—

 
—

 
—

 
146.5

Interest expense
 
180.9

 
38.9

 
8.5

 
228.3

 
—

 
62.1

 
120.9

 
(8.6
)
 
402.7

Capital expenditures
 
910.9

 
293.2

 
59.5

 
1,263.6

 
—

 
62.3

 
97.8

 
—

 
1,423.7

Total assets *
 
21,730.7

 
5,714.6

 
995.1

 
28,440.4

 
1,476.9

 
2,777.1

 
778.0

 
(3,349.2
)
 
30,123.2


*
Total assets at December 31, 2016 reflect an elimination of $2,029.5 million for all lease activity between We Power and WE.
 
 
Utility Operations
 
 
 
 
 
 
 
 
 
 
2015 (in millions)
 
Wisconsin
 
Illinois
 
Other States
 
Total Utility
Operations
 
Electric Transmission
 
Non-Utility Energy Infrastructure
 
Corporate and Other
 
Reconciling
Eliminations
 
WEC Energy Group Consolidated
External revenues
 
$
5,186.1

 
$
503.4

 
$
149.3

 
$
5,838.8

 
$
—

 
$
40.0

 
$
47.3

 
$
—

 
$
5,926.1

Intersegment revenues
 
5.0

 
—

 
—

 
5.0

 
—

 
405.2

 
—

 
(410.2
)
 
—

Other operation and maintenance
 
1,741.0

 
219.6

 
50.0

 
2,010.6

 
—

 
4.3

 
103.7

 
(409.3
)
 
1,709.3

Depreciation and amortization
 
408.6

 
63.3

 
10.0

 
481.9

 
—

 
67.5

 
12.4

 
—

 
561.8

Operating income (loss)
 
884.2

 
78.1

 
6.0

 
968.3

 
—

 
373.4

 
(91.2
)
 
—

 
1,250.5

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
96.1

 
—

 
—

 
—

 
96.1

Interest expense
 
157.1

 
19.9

 
5.1

 
182.1

 
—

 
63.4

 
91.0

 
(5.1
)
 
331.4

Capital expenditures
 
950.3

 
194.4

 
34.7

 
1,179.4

 
—

 
53.4

 
33.4

 
—

 
1,266.2

Total assets *
 
21,113.5

 
5,462.9

 
918.0

 
27,494.4

 
1,381.0

 
2,779.0

 
1,132.5

 
(3,431.7
)
 
29,355.2



*
Total assets at December 31, 2015 reflect an elimination of $2,105.3 million for all lease activity between We Power and WE.