SEGMENTS OF BUSINESS (Tables)

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Schedule of information related to reportable segments

The tables below present information related to our reportable segments:

	Regulated Utilities
(Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Three Months Ended September 30, 2014
External revenues	$	327.4		$	43.0		$	370.4		$	—	$	—		$	370.4
Intersegment revenues	—			3.4			3.4			0.3		(3.7		)	—
Depreciation and amortization expense	24.6			4.1			28.7			0.1		(0.1		)	28.7
Miscellaneous income	2.1			—			2.1			3.5		—			5.6
Interest expense	11.4			2.6			14.0			0.6		—			14.6
Provision (benefit) for income taxes	27.3			(2.3		)	25.0			1.0		—			26.0
Preferred stock dividend requirements	(0.7		)	—			(0.7		)	—		—			(0.7		)
Net income (loss) attributed to common shareholder	43.1			(3.0		)	40.1			2.1		—			42.2
	Regulated Utilities
(Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Three Months Ended September 30, 2013
External revenues	$	331.7		$	40.2		$	371.9		$	—	$	—		$	371.9
Intersegment revenues	—			4.1			4.1			0.5		(4.6		)	—
Depreciation and amortization expense	23.6			3.9			27.5			0.2		(0.1		)	27.6
Miscellaneous income	2.8			—			2.8			3.2		—			6.0
Interest expense	7.9			2.1			10.0			0.7		—			10.7
Provision (benefit) for income taxes	23.8			(2.0		)	21.8			1.0		—			22.8
Preferred stock dividend requirements	(0.6		)	(0.1		)	(0.7		)	—		—			(0.7		)
Net income (loss) attributed to common shareholder	38.3			(3.0		)	35.3			1.7		—			37.0
	Regulated Utilities
(Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Nine Months Ended September 30, 2014
External revenues	$	940.2		$	344.7		$	1,284.9		$	—	$	—		$	1,284.9
Intersegment revenues	—			10.5			10.5			1.0		(11.5		)	—
Depreciation and amortization expense	72.3			12.2			84.5			0.5		(0.4		)	84.6
Miscellaneous income	8.4			0.1			8.5			11.0		—			19.5
Interest expense	33.5			7.8			41.3			1.6		—			42.9
Provision for income taxes	52.5			11.2			63.7			3.0		—			66.7
Preferred stock dividend requirements	(2.0		)	(0.3		)	(2.3		)	—		—			(2.3		)
Net income attributed to common shareholder	85.2			17.6			102.8			6.8		—			109.6
	Regulated Utilities
(Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Nine Months Ended September 30, 2013
External revenues	$	946.0		$	227.1		$	1,173.1		$	—	$	—		$	1,173.1
Intersegment revenues	—			8.3			8.3			1.1		(9.4		)	—
Depreciation and amortization expense	66.9			11.8			78.7			0.5		(0.4		)	78.8
Miscellaneous income	6.5			0.1			6.6			10.3		—			16.9
Interest expense	23.8			6.4			30.2			1.7		—			31.9
Provision for income taxes	52.9			8.9			61.8			2.9		—			64.7
Preferred stock dividend requirements	(1.9		)	(0.4		)	(2.3		)	—		—			(2.3		)
Net income attributed to common shareholder	87.1			14.4			101.5			6.0		—			107.5