SEGMENTS OF BUSINESS (Tables)

6 Months Ended

Jun. 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 June 30, 2014
External revenues	$	291.4		$	67.4		$	358.8		$	—	$	—		$	358.8
Intersegment revenues	—			2.7			2.7			0.4		(3.1		)	—
Depreciation and amortization expense	24.2			4.1			28.3			0.2		(0.2		)	28.3
Miscellaneous income	2.8			0.1			2.9			3.7		—			6.6
Interest expense	11.2			2.6			13.8			0.5		—			14.3
Provision for income taxes	9.7			0.2			9.9			1.0		—			10.9
Preferred stock dividend requirements	(0.6		)	(0.2		)	(0.8		)	—		—			(0.8		)
Net income attributed to common shareholder	14.9			(0.1		)	14.8			2.3		—			17.1
	Regulated Utilities
(Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Three Months Ended June 30, 2013
External revenues	$	306.4		$	61.4		$	367.8		$	—	$	—		$	367.8
Intersegment revenues	—			2.4			2.4			0.3		(2.7		)	—
Depreciation and amortization expense	23.8			4.0			27.8			0.2		(0.2		)	27.8
Miscellaneous income	2.1			—			2.1			3.8		—			5.9
Interest expense	7.7			2.2			9.9			0.4		—			10.3
Provision for income taxes	14.5			0.3			14.8			1.0		—			15.8
Preferred stock dividend requirements	(0.6		)	(0.2		)	(0.8		)	—		—			(0.8		)
Net income attributed to common shareholder	23.1			0.3			23.4			2.5		—			25.9
	Regulated Utilities
(Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Six Months Ended June 30, 2014
External revenues	$	612.8		$	301.7		$	914.5		$	—	$	—		$	914.5
Intersegment revenues	—			7.1			7.1			0.7		(7.8		)	—
Depreciation and amortization expense	47.7			8.1			55.8			0.4		(0.3		)	55.9
Miscellaneous income	6.3			0.1			6.4			7.5		—			13.9
Interest expense	22.1			5.2			27.3			1.0		—			28.3
Provision for income taxes	25.2			13.5			38.7			2.0		—			40.7
Preferred stock dividend requirements	(1.3		)	(0.3		)	(1.6		)	—		—			(1.6		)
Net income attributed to common shareholder	42.1			20.6			62.7			4.7		—			67.4
	Regulated Utilities
(Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Six Months Ended June 30, 2013
External revenues	$	614.3		$	186.9		$	801.2		$	—	$	—		$	801.2
Intersegment revenues	—			4.2			4.2			0.6		(4.8		)	—
Depreciation and amortization expense	43.3			7.9			51.2			0.3		(0.3		)	51.2
Miscellaneous income	3.7			0.1			3.8			7.1		—			10.9
Interest expense	15.9			4.3			20.2			1.0		—			21.2
Provision for income taxes	29.1			10.9			40.0			1.9		—			41.9
Preferred stock dividend requirements	(1.3		)	(0.3		)	(1.6		)	—		—			(1.6		)
Net income attributed to common shareholder	48.8			17.4			66.2			4.3		—			70.5