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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018, 2017, and 2016.
 
 
Utility Operations
 
 
 
 
 
 
 
 
 
 
2018 (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
 
$
5,794.7

 
$
1,400.0

 
$
438.2

 
$
7,632.9

 
$
—

 
$
37.9

 
$
8.7

 
$
—

 
$
7,679.5

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
430.5

 
—

 
(430.5
)
 
—

Other operation and maintenance
 
2,076.1

 
472.3

 
101.0

 
2,649.4

 
—

 
12.6

 
1.8

 
(393.3
)
 
2,270.5

Depreciation and amortization
 
546.6

 
170.3

 
24.1

 
741.0

 
—

 
75.7

 
29.1

 
—

 
845.8

Operating income (loss)
 
800.2

 
255.8

 
68.8

 
1,124.8

 
—

 
365.8

 
(22.2
)
 
—

 
1,468.4

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
136.7

 
—

 
—

 
—

 
136.7

Interest expense
 
200.7

 
51.2

 
8.7

 
260.6

 
0.3

 
63.7

 
125.8

 
(5.3
)
 
445.1

Capital
  expenditures and asset acquisitions
 
1,466.1

 
547.1

 
103.6

 
2,116.8

 
—

 
260.6

 
39.7

 
—

 
2,417.1

Total assets *
 
23,407.0

 
6,483.3

 
1,147.9

 
31,038.2

 
1,665.3

 
3,227.2

 
959.6

 
(3,414.5
)
 
33,475.8


*
Total assets at December 31, 2018 reflect an elimination of $1,968.5 million for all lease activity between We Power and WE.
 
 
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)
 
1,923.2

 
464.2

 
101.1

 
2,488.5

 
—

 
7.3

 
1.4

 
(441.1
)
 
2,056.1

Depreciation and amortization
 
523.9

 
152.6

 
24.8

 
701.3

 
—

 
71.4

 
25.9

 
—

 
798.6

Operating income (loss) (1)
 
1,055.2

 
279.9

 
54.4

 
1,389.5

 
—

 
400.5

 
(13.9
)
 
—

 
1,776.1

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 (2)
 
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


(1) 
Includes the retroactive restatement impacts of the implementation of ASU 2017-07. See Note 18, Employee Benefits, for more information on this new standard.

(2) 
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 (1)
 
2,034.6

 
463.6

 
108.8

 
2,607.0

 
—

 
4.3

 
(16.4
)
 
(423.6
)
 
2,171.3

Depreciation and amortization
 
496.6

 
134.0

 
21.1

 
651.7

 
—

 
68.3

 
42.6

 
—

 
762.6

Operating income (loss) (1)
 
1,017.8

 
261.1

 
51.2

 
1,330.1

 
—

 
375.6

 
(9.4
)
 
—

 
1,696.3

Equity in earnings of transmission affiliate
 
—

 
—

 
—

 
—

 
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 (2)
 
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


(1) 
Includes the retroactive restatement impacts of the implementation of ASU 2017-07. See Note 18, Employee Benefits, for more information on this new standard.

(2) 
Total assets at December 31, 2016 reflect an elimination of $2,029.5 million for all lease activity between We Power and WE.