SEGMENTS OF BUSINESS (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Schedule of information related to reportable segments

The tables below present information related to our reportable segments:

	Regulated Operations											Nonutility and Nonregulated Operations
2013 (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
Income Statement
External revenues	$	2,093.6		$	1,332.0		$	—	$	3,425.6		$	2,166.2		$	42.8		$	—		$	5,634.6
Intersegment revenues	11.4			0.1			—		11.5			1.3			1.4			(14.2		)	—
Depreciation and amortization expense	136.0			98.6			—		234.6			11.4			21.1			(0.5		)	266.6
Earnings from equity method investments	—			—			89.1		89.1			1.3			1.1			—			91.5
Miscellaneous income	1.2			9.8			—		11.0			8.5			23.6			(13.3		)	29.8
Interest expense	50.2			36.4			—		86.6			2.0			52.9			(13.3		)	128.2
Provision (benefit) for income taxes	78.9			67.3			35.2		181.4			48.0			(18.6		)	—			210.8
Net income (loss) from continuing operations	124.0			113.4			53.9		291.3			79.4			(20.7		)	—			350.0
Discontinued operations	—			—			—		—			(1.1		)	5.9			—			4.8
Preferred stock dividends of subsidiary	(0.6		)	(2.5		)	—		(3.1		)	—			—			—			(3.1		)
Noncontrolling interest in subsidiaries	—			—			—		—			—			0.1			—			0.1
Net income (loss) attributed to common shareholders	123.4			110.9			53.9		288.2			78.3			(14.7		)	—			351.8
Total assets	5,672.0			3,514.4			508.5		9,694.9			989.2			1,345.9			(786.5		)	11,243.5
Cash expenditures for long-lived assets	370.0			615.0			—		985.0			15.8			60.0			—			1,060.8

	Regulated Operations											Nonutility and Nonregulated Operations
2012 (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
Income Statement
External revenues	$	1,662.1		$	1,297.4		$	—	$	2,959.5		$	1,217.6		$	35.3		$	—		$	4,212.4
Intersegment revenues	9.9			—			—		9.9			0.9			1.9			(12.7		)	—
Depreciation and amortization expense	131.8			89.0			—		220.8			10.3			20.1			(0.5		)	250.7
Earnings from equity method investments	—			—			85.3		85.3			1.1			0.8			—			87.2
Miscellaneous income	0.6			2.6			—		3.2			1.1			20.9			(15.9		)	9.3
Interest expense	47.3			35.9			—		83.2			2.1			50.8			(15.9		)	120.2
Provision (benefit) for income taxes	61.4			49.4			32.9		143.7			25.8			(19.7		)	—			149.8
Net income (loss) from continuing operations	94.0			110.4			52.4		256.8			52.6			(15.4		)	—			294.0
Discontinued operations	—			—			—		—			(11.5		)	1.8			—			(9.7		)
Preferred stock dividends of subsidiary	(0.6		)	(2.5		)	—		(3.1		)	—			—			—			(3.1		)
Noncontrolling interest in subsidiaries	—			—			—		—			—			0.2			—			0.2
Net income (loss) attributed to common shareholders	93.4			107.9			52.4		253.7			41.1			(13.4		)	—			281.4
Total assets	5,446.2			3,041.3			476.6		8,964.1			749.2			1,267.8			(653.7		)	10,327.4
Cash expenditures for long-lived assets	375.1			163.9			—		539.0			30.9			24.4			—			594.3

	Regulated Operations											Nonutility and Nonregulated Operations
2011 (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
Income Statement
External revenues	$	1,987.2		$	1,307.3		$	—	$	3,294.5		$	1,372.0		$	19.4		$	—		$	4,685.9
Intersegment revenues	10.8			—			—		10.8			1.1			1.5			(13.4		)	—
Depreciation and amortization expense	126.1			88.5			—		214.6			10.3			23.3			(0.5		)	247.7
Earnings (losses) from equity method investments	—			—			79.1		79.1			(0.7		)	1.0			—			79.4
Miscellaneous income	2.2			0.8			—		3.0			1.0			18.3			(17.0		)	5.3
Interest expense	48.4			41.8			—		90.2			1.7			53.3			(17.0		)	128.2
Provision (benefit) for income taxes	61.2			59.2			31.3		151.7			(7.7		)	(10.7		)	—			133.3
Net income (loss) from continuing operations	103.9			103.0			47.8		254.7			(7.1		)	(17.6		)	—			230.0
Discontinued operations	—			—			—		—			1.0			(0.5		)	—			0.5
Preferred stock dividends of subsidiary	(0.6		)	(2.5		)	—		(3.1		)	—			—			—			(3.1		)
Net income (loss) attributed to common shareholders	103.3			100.5			47.8		251.6			(6.1		)	(18.1		)	—			227.4
Total assets	5,033.0			2,982.9			439.4		8,455.3			891.5			1,215.3			(578.9		)	9,983.2
Cash expenditures for long-lived assets	199.3			84.1			—		283.4			16.7			10.0			—			310.1