SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2021

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, 2021 and 2020:

	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, 2021
External revenues	$	1,731.7	$	703.4	$	233.3	$	2,668.4	$	—	$	22.9	$	0.1	$	—	$	2,691.4
Intersegment revenues	—		—		—		—		—		114.7		—		(114.7)		—
Other operation and maintenance	341.9		109.3		23.2		474.4		—		8.9		(1.8)		(1.6)		479.9
Depreciation and amortization	176.2		52.7		9.2		238.1		—		31.0		6.6		(14.3)		261.4
Equity in earnings of transmission affiliates	—		—		—		—		42.6		—		—		—		42.6
Interest expense	140.1		16.5		1.5		158.1		4.9		18.0		24.2		(85.7)		119.5
Income tax expense (benefit)	48.1		41.4		8.4		97.9		9.8		0.1		(32.9)		—		74.9
Net income	256.6		112.1		24.7		393.4		28.0		71.3		17.6		—		510.3
Net income attributed to common shareholders	256.3		112.1		24.7		393.1		28.0		71.4		17.6		—		510.1

	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, 2020
External revenues	$	1,498.9	$	447.6	$	146.4	$	2,092.9	$	—	$	15.2	$	0.5	$	—	$	2,108.6
Intersegment revenues	—		—		—		—		—		114.4		—		(114.4)		—
Other operation and maintenance	330.8		104.1		21.7		456.6		—		5.2		(1.6)		(4.5)		455.7
Depreciation and amortization	165.4		47.5		7.8		220.7		—		24.5		6.1		(12.2)		239.1
Equity in earnings of transmission affiliates	—		—		—		—		39.8		—		—		—		39.8
Interest expense	143.1		16.0		2.2		161.3		4.8		15.3		35.1		(87.1)		129.4
Income tax expense (benefit)	51.2		39.5		8.9		99.6		9.9		11.2		(30.7)		—		90.0
Net income (loss)	247.0		107.3		26.3		380.6		25.0		65.3		(18.3)		—		452.6
Net income (loss) attributed to common shareholders	246.7		107.3		26.3		380.3		25.0		65.5		(18.3)		—		452.5