Segment Information

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

At December 31, 2016, we reported six segments, which are described below.

• The Wisconsin segment includes the electric and natural gas utility operations of WE, WG, and WPS, including WE's and WPS's electric and natural gas operations in the state of Michigan that were transferred to UMERC effective January 1, 2017.

• The Illinois segment includes the natural gas utility and non-utility operations of PGL and NSG.

• The other states segment includes the natural gas utility and non-utility operations of MERC and MGU.

• The electric transmission segment includes our approximate 60% ownership interest in ATC, a for-profit, electric transmission company regulated by the FERC and certain state regulatory commissions.

• The We Power segment includes our nonregulated entity that owns and leases generating facilities to WE.

• The corporate and other segment includes the operations of the WEC Energy Group holding company, the Integrys holding company, the Peoples Energy, LLC holding company, Wispark, Bostco, Wisvest, WECC, WBS, PDL, and ITF. The sale of ITF was completed in the first quarter of 2016. In the second quarter of 2016, we sold certain assets of Wisvest. See Note 3, Dispositions, for more information on these sales.

All of our operations and assets are located within the United States. The following tables show summarized financial information related to our reportable segments for the years ended December 31, 2016, 2015, and 2014.

	Regulated Operations
2016 (in millions)	Wisconsin		Illinois		Other States		Electric Transmission		Total Regulated Operations		We Power		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 affiliate	—		—		—		146.5		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		1,476.9		29,917.3		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.

	Regulated Operations
2015 (in millions)	Wisconsin		Illinois		Other States		Electric Transmission		Total Regulated Operations		We Power		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 affiliate	—		—		—		96.1		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		1,381.0		28,875.4		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.

	Regulated Operations
2014 (in millions)	Wisconsin		Illinois		Other States		Electric Transmission		Total Regulated Operations		We Power		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
External revenues	$	4,932.1	$	—	$	—	$	—	$	4,932.1	$	55.7	$	9.3		$	—		$	4,997.1
Intersegment revenues	9.2		—		—		—		9.2		383.4		—			(392.6		)	—
Other operation and maintenance	1,462.7		—		—		—		1,462.7		4.4		33.0			(387.7		)	1,112.4
Depreciation and amortization	323.2		—		—		—		323.2		66.7		1.5			—			391.4
Operating income (loss)	770.2		—		—		—		770.2		368.0		(26.1		)	—			1,112.1
Equity in earnings of transmission affiliate	—		—		—		66.0		66.0		—		—			—			66.0
Interest expense	127.6		—		—		—		127.6		64.6		48.8			(0.7		)	240.3
Capital expenditures	715.0		—		—		—		715.0		41.0		5.2			—			761.2
Total assets *	14,403.8		—		—		424.1		14,827.9		2,789.9		253.3			(2,966.1		)	14,905.0

* Total assets at December 31, 2014 reflect an elimination of $2,172.9 million for all lease activity between We Power and WE.