SEGMENTS OF BUSINESS

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

SEGMENTS OF BUSINESS

Segments of Business

At March 31, 2015, we had four segments related to our continuing operations and one segment related to the discontinued operations of IES's retail energy business. Our reportable segments are described below.

• The natural gas utility segment includes the natural gas utility operations of MERC, MGU, NSG, PGL, and WPS.

• The electric utility segment includes the electric utility operations of WPS, as well as the operations of UPPCO prior to its sale to Balfour Beatty Infrastructure Partners LP in August 2014. See Note 4, 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 IES segment includes the nonregulated energy operations of IES's retail energy business. Since we sold IES's retail energy business in November 2014, this segment only includes discontinued operations. See Note 4, Dispositions, for more information on the sale of IES's retail energy business. The remaining energy asset business, PDI, was reclassified to the holding company and other segment.

• The holding company and other segment includes the operations of the Integrys Energy Group holding company, ITF, PDI, and the PELLC holding company, along with any nonutility activities at IBS, MERC, MGU, NSG, PGL, UPPCO, and WPS.

The tables below present information related to our reportable segments:

	Regulated Operations											Nonutility and Nonregulated Operations
(Millions)	Natural Gas Utility			Electric Utility			Electric Transmission Investment		Total Regulated Operations			IES			Holding Company and Other			Reconciling Eliminations			Integrys Energy Group Consolidated
Three Months Ended
March 31, 2015
External revenues	$	839.5		$	295.8		$	—	$	1,135.3		$	—		$	27.9		$	—		$	1,163.2
Intersegment revenues	2.6			—			—		2.6			—			0.2			(2.8		)	—
Depreciation and amortization expense	40.6			25.0			—		65.6			—			9.2			(0.1		)	74.7
Earnings from equity method investments	—			—			17.0		17.0			—			0.5			—			17.5
Miscellaneous income	0.7			2.8			—		3.5			—			5.1			(2.0		)	6.6
Interest expense	14.3			10.9			—		25.2			—			15.0			(2.0		)	38.2
Provision (benefit) for income taxes	65.9			16.4			6.7		89.0			—			(10.1		)	—			78.9
Net income (loss) from continuing operations	97.8			28.6			10.3		136.7			—			(5.5		)	—			131.2
Discontinued operations	—			—			—		—			(0.8		)	(0.1		)	—			(0.9		)
Preferred stock dividends of subsidiary	(0.1		)	(0.7		)	—		(0.8		)	—			—			—			(0.8		)
Net income (loss) attributed to common shareholders	97.7			27.9			10.3		135.9			(0.8		)	(5.6		)	—			129.5

	Regulated Operations											Nonutility and Nonregulated Operations
(Millions)	Natural Gas Utility			Electric Utility			Electric Transmission Investment		Total Regulated Operations			IES		Holding Company and Other			Reconciling Eliminations			Integrys Energy Group Consolidated
Three Months Ended
March 31, 2014
External revenues	$	1,267.6		$	349.2		$	—	$	1,616.8		$	—	$	21.2		$	—		$	1,638.0
Intersegment revenues	4.4			—			—		4.4			—		0.4			(4.8		)	—
Depreciation and amortization expense	36.4			25.6			—		62.0			—		8.7			(0.1		)	70.6
Earnings from equity method investments	—			—			22.5		22.5			—		0.4			—			22.9
Miscellaneous income	0.3			3.5			—		3.8			—		5.3			(3.3		)	5.8
Interest expense	13.4			11.7			—		25.1			—		17.1			(3.3		)	38.9
Provision (benefit) for income taxes	66.7			18.1			8.8		93.6			—		(11.7		)	—			81.9
Net income (loss) from continuing operations	99.2			31.8			13.7		144.7			—		(4.5		)	—			140.2
Discontinued operations	—			—			—		—			13.0		(0.1		)	—			12.9
Preferred stock dividends of subsidiary	(0.1		)	(0.7		)	—		(0.8		)	—		—			—			(0.8		)
Noncontrolling interest in subsidiaries	—			—			—		—			—		0.1			—			0.1
Net income (loss) attributed to common shareholders	99.1			31.1			13.7		143.9			13.0		(4.5		)	—			152.4