SEGMENTS OF BUSINESS

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

SEGMENTS OF BUSINESS

SEGMENTS OF BUSINESS

At September 30, 2013, we reported five segments, which are described below.

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

• The electric utility segment includes the regulated electric utility operations of UPPCO and WPS.

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

• Integrys Energy Services is a diversified nonregulated retail energy supply and services company that primarily sells electricity and natural gas in deregulated markets. In addition, Integrys Energy Services invests in energy assets with renewable attributes.

• The holding company and other segment includes the operations of the Integrys Energy Group holding company, ITF, 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			Integrys Energy Services			Holding Company and Other			Reconciling Eliminations			Integrys Energy Group Consolidated
Three Months Ended
September 30, 2013
External revenues	$	253.0		$	353.9		$	—	$	606.9		$	512.7		$	10.1		$	—		$	1,129.7
Intersegment revenues	4.2			0.1			—		4.3			0.3			0.3			(4.9		)	—
Depreciation and amortization expense	35.6			25.7			—		61.3			2.9			5.5			(0.1		)	69.6
Earnings from equity method investments	—			—			22.3		22.3			0.5			0.3			—			23.1
Miscellaneous income	0.4			2.8			—		3.2			6.2			5.7			(3.0		)	12.1
Interest expense	12.7			8.8			—		21.5			0.5			14.1			(3.0		)	33.1
Provision (benefit) for income taxes	(19.5		)	25.1			8.6		14.2			6.6			(2.8		)	—			18.0
Net income (loss) from continuing operations	(19.5		)	40.9			13.7		35.1			12.3			(8.0		)	—			39.4
Discontinued operations	—			—			—		—			(0.6		)	—			—			(0.6		)
Preferred stock dividends of subsidiary	(0.1		)	(0.6		)	—		(0.7		)	—			—			—			(0.7		)
Net income (loss) attributed to common shareholders	(19.6		)	40.3			13.7		34.4			11.7			(8.0		)	—			38.1

	Regulated Operations											Nonutility and Nonregulated Operations
(Millions)	Natural Gas Utility			Electric Utility			Electric Transmission Investment		Total Regulated Operations			Integrys Energy Services			Holding Company and Other			Reconciling Eliminations			Integrys Energy Group Consolidated
Three Months Ended
September 30, 2012
External revenues	$	215.5		$	366.8		$	—	$	582.3		$	335.5		$	9.9		$	—		$	927.7
Intersegment revenues	4.5			—			—		4.5			0.1			0.3			(4.9		)	—
Depreciation and amortization expense	33.2			22.3			—		55.5			2.7			4.8			(0.1		)	62.9
Earnings from equity method investments	—			—			21.7		21.7			0.5			—			—			22.2
Miscellaneous income	0.1			0.9			—		1.0			0.3			5.7			(3.9		)	3.1
Interest expense	11.7			8.9			—		20.6			0.5			12.7			(3.9		)	29.9
Provision (benefit) for income taxes	(11.5		)	19.5			8.3		16.3			16.1			(2.8		)	—			29.6
Net income (loss) from continuing operations	(13.9		)	47.8			13.4		47.3			32.2			(5.2		)	—			74.3
Discontinued operations	—			—			—		—			(8.0		)	—			—			(8.0		)
Preferred stock dividends of subsidiary	(0.1		)	(0.6		)	—		(0.7		)	—			—			—			(0.7		)
Noncontrolling interest in subsidiaries	—			—			—		—			—			0.1			—			0.1
Net income (loss) attributed to common shareholders	(14.0		)	47.2			13.4		46.6			24.2			(5.1		)	—			65.7

	Regulated Operations											Nonutility and Nonregulated Operations
(Millions)	Natural Gas Utility			Electric Utility			Electric Transmission Investment		Total Regulated Operations			Integrys Energy Services			Holding Company and Other			Reconciling Eliminations			Integrys Energy Group Consolidated
Nine Months Ended
September 30, 2013
External revenues	$	1,412.4		$	1,012.7		$	—	$	2,425.1		$	1,470.7		$	28.1		$	—		$	3,923.9
Intersegment revenues	8.6			0.1			—		8.7			0.9			1.0			(10.6		)	—
Depreciation and amortization expense	100.1			73.0			—		173.1			8.4			14.9			(0.4		)	196.0
Earnings from equity method investments	—			—			66.0		66.0			1.2			1.0			—			68.2
Miscellaneous income	0.8			6.6			—		7.4			8.0			18.0			(10.1		)	23.3
Interest expense	37.3			26.4			—		63.7			1.5			35.9			(10.1		)	91.0
Provision (benefit) for income taxes	43.1			56.9			25.3		125.3			11.7			(12.7		)	—			124.3
Net income (loss) from continuing operations	72.0			94.5			40.7		207.2			22.5			(12.0		)	—			217.7
Discontinued operations	—			—			—		—			(1.2		)	5.9			—			4.7
Preferred stock dividends of subsidiary	(0.4		)	(1.9		)	—		(2.3		)	—			—			—			(2.3		)
Noncontrolling interest in subsidiaries	—			—			—		—			—			0.1			—			0.1
Net income (loss) attributed to common shareholders	71.6			92.6			40.7		204.9			21.3			(6.0		)	—			220.2

	Regulated Operations											Nonutility and Nonregulated Operations
(Millions)	Natural Gas Utility			Electric Utility			Electric Transmission Investment		Total Regulated Operations			Integrys Energy Services			Holding Company and Other			Reconciling Eliminations			Integrys Energy Group Consolidated
Nine Months Ended
September 30, 2012
External revenues	$	1,131.3		$	985.6		$	—	$	2,116.9		$	873.7		$	24.6		$	—		$	3,015.2
Intersegment revenues	8.1			—			—		8.1			0.6			1.5			(10.2		)	—
Depreciation and amortization expense	98.3			66.4			—		164.7			7.4			15.9			(0.4		)	187.6
Earnings from equity method investments	—			—			63.8		63.8			1.2			0.5			—			65.5
Miscellaneous income	0.6			1.5			—		2.1			0.8			16.4			(12.1		)	7.2
Interest expense	35.1			27.1			—		62.2			1.5			38.4			(12.1		)	90.0
Provision (benefit) for income taxes	32.6			42.4			24.0		99.0			23.6			(16.0		)	—			106.6
Net income (loss) from continuing operations	53.8			94.3			39.8		187.9			46.0			(9.1		)	—			224.8
Discontinued operations	—			—			—		—			(11.0		)	1.8			—			(9.2		)
Preferred stock dividends of subsidiary	(0.4		)	(1.9		)	—		(2.3		)	—			—			—			(2.3		)
Noncontrolling interest in subsidiaries	—			—			—		—			—			0.1			—			0.1
Net income (loss) attributed to common shareholders	53.4			92.4			39.8		185.6			35.0			(7.2		)	—			213.4