SEGMENTS OF BUSINESS

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

SEGMENTS OF BUSINESS

Segments of Business

We reorganized our business segments during the second quarter of 2015 to reflect our new internal organization and management structure. We use net income to measure segment profitability and allocate resources to our businesses. All prior period amounts impacted by this change were reclassified to conform to the new presentation. At June 30, 2015, we reported five segments, which are described below.

• The Wisconsin segment includes the electric and natural gas utility and nonutility operations of WPS.

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

• The Other States segment includes the natural gas utility and nonutility operations of MERC and MGU, as well as the operations of UPPCO prior to its sale to Balfour Beatty Infrastructure Partners LP in August 2014. See Note 3, Dispositions, for more information on the sale of UPPCO.

• The Electric Transmission Investment segment includes our approximate 34% ownership interest in ATC. ATC is a federally regulated electric transmission company.

• The Corporate and Other segment includes the operations of the holding company, ITF, PDL, the PELLC holding company, and any nonutility activities at WBS, as well as the operations of IES's retail energy business prior to its sale in November 2014 to Exelon Generation Company, LLC. See Note 3, Dispositions, for more information on the sale of IES's retail energy business.

The tables below present information related to our reportable segments:

	Regulated Operations
(Millions)	Wisconsin		Illinois		Other States		Electric Transmission Investment		Total Regulated Operations		Corporate and Other			Reconciling Eliminations			Integrys Holding Consolidated
Three Months Ended
June 30, 2015
External revenues	$	330.2	$	218.6	$	67.9	$	—	$	616.7	$	21.6		$	—		$	638.3
Depreciation and amortization expense	30.2		30.8		4.8		—		65.8		6.3			—			72.1
Merger costs	—		—		—		—		—		59.3			—			59.3
Impairment loss on property, plant, and equipment at PDL	—		—		—		—		—		10.7			—			10.7
Gain on sale of certain PDL solar power generation plants	—		—		—		—		—		(5.2		)	—			(5.2		)
Equity in earnings of transmission affiliate	—		—		—		22.4		22.4		—			—			22.4
Miscellaneous income (expense)	4.3		0.2		—		—		4.5		(0.2		)	(2.5		)	1.8
Interest expense	14.5		9.9		2.7		—		27.1		15.4			(2.5		)	40.0
Provision (benefit) for income taxes	13.0		3.6		0.6		8.9		26.1		(34.2		)	—			(8.1		)
Net income (loss)	21.0		4.7		0.9		13.5		40.1		(49.4		)	—			(9.3		)

	Regulated Operations
(Millions)	Wisconsin		Illinois			Other States			Electric Transmission Investment		Total Regulated Operations		Corporate and Other			Reconciling Eliminations			Integrys Holding Consolidated
Three Months Ended
June 30, 2014
External revenues	$	353.1	$	351.0		$	106.5		$	—	$	810.6	$	26.5		$	—		$	837.1
Intersegment revenues	5.8		—			—			—		5.8		—			(5.8		)	—
Depreciation and amortization expense	29.0		28.4			6.6			—		64.0		8.8			—			72.8
Merger costs	—		—			—			—		—		5.9			—			5.9
Equity in earnings of transmission affiliate	—		—			—			23.0		23.0		—			—			23.0
Miscellaneous income (expense)	4.2		(0.5		)	—			—		3.7		5.2			(3.1		)	5.8
Interest expense	15.1		8.2			3.1			—		26.4		16.0			(3.1		)	39.3
Provision (benefit) for income taxes	9.9		(3.8		)	(2.2		)	9.2		13.1		(8.6		)	—			4.5
Net income (loss) from continuing operations	15.5		(5.4		)	(2.6		)	13.8		21.3		(13.3		)	—			8.0
Discontinued operations	—		—			—			—		—		(0.8		)	—			(0.8		)
Net income (loss)	15.5		(5.4		)	(2.6		)	13.8		21.3		(14.1		)	—			7.2

	Regulated Operations
(Millions)	Wisconsin		Illinois			Other States		Electric Transmission Investment		Total Regulated Operations		Corporate and Other			Reconciling Eliminations			Integrys Holding Consolidated
Six Months Ended
June 30, 2015
External revenues	$	755.3	$	750.2		$	250.4	$	—	$	1,755.9	$	45.9		$	—		$	1,801.8
Depreciation and amortization expense	60.1		62.5			9.5		—		132.1		15.4			—			147.5
Merger costs	—		—			—		—		—		60.0			—			60.0
Impairment loss on property, plant, and equipment at PDL	—		—			—		—		—		10.7			—			10.7
Gain on sale of certain PDL solar power generation plants	—		—			—		—		—		(5.2		)	—			(5.2		)
Equity in earnings of transmission affiliate	—		—			—		39.4		39.4		—			—			39.4
Miscellaneous income	8.8		0.9			—		—		9.7		3.9			(4.5		)	9.1
Interest expense	29.2		19.4			5.0		—		53.6		29.9			(4.5		)	79.0
Provision (benefit) for income taxes	35.1		52.3			12.3		15.6		115.3		(44.4		)	—			70.9
Net income (loss) from continuing operations	58.6		76.2			18.3		23.8		176.9		(55.9		)	—			121.0
Discontinued operations	—		—			—		—		—		(0.8		)	—			(0.8		)
Net income (loss)	58.6		76.2			18.3		23.8		176.9		(56.7		)	—			120.2
	Regulated Operations
(Millions)	Wisconsin		Illinois			Other States		Electric Transmission Investment		Total Regulated Operations		Corporate and Other			Reconciling Eliminations			Integrys Holding Consolidated
Six Months Ended
June 30, 2014
External revenues	$	903.7	$	1,127.8		$	399.7	$	—	$	2,431.2	$	44.2		$	—		$	2,475.4
Intersegment revenues	11.2		—			—		—		11.2		—			(11.2		)	—
Depreciation and amortization expense	57.4		56.4			13.1		—		126.9		17.3			—			144.2
Merger costs	—		—			—		—		—		5.9			—			5.9
Equity in earnings of transmission affiliate	—		—			—		45.5		45.5		—			—			45.5
Miscellaneous income (expense)	9.2		(0.2		)	—		—		9.0		9.8			(6.5		)	12.3
Interest expense	29.9		16.5			6.5		—		52.9		32.6			(6.5		)	79.0
Provision (benefit) for income taxes	38.7		35.6			14.1		18.0		106.4		(20.0		)	—			86.4
Net income (loss) from continuing operations	64.3		52.3			22.0		27.5		166.1		(18.6		)	—			147.5
Discontinued operations	—		—			—		—		—		12.1			—			12.1
Net income (loss)	64.3		52.3			22.0		27.5		166.1		(6.5		)	—			159.6