SEGMENTS OF BUSINESS (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2014
External revenues	$	321.4		$	234.3		$	555.7		$	—	$	—		$	555.7
Intersegment revenues	—			4.4			4.4			0.3		(4.7		)	—
Depreciation and amortization expense	23.5			4.0			27.5			0.2		(0.1		)	27.6
Miscellaneous income	3.5			—			3.5			3.8		—			7.3
Interest expense	10.9			2.6			13.5			0.5		—			14.0
Provision for income taxes	15.5			13.3			28.8			1.0		—			29.8
Preferred stock dividend requirements	(0.7		)	(0.1		)	(0.8		)	—		—			(0.8		)
Net income attributed to common shareholder	27.2			20.7			47.9			2.4		—			50.3
	Regulated Utilities
(Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Three Months Ended March 31, 2013
External revenues	$	307.9		$	125.5		$	433.4		$	—	$	—		$	433.4
Intersegment revenues	—			1.8			1.8			0.3		(2.1		)	—
Depreciation and amortization expense	19.5			3.9			23.4			0.1		(0.1		)	23.4
Miscellaneous income	1.6			0.1			1.7			3.3		—			5.0
Interest expense	8.2			2.1			10.3			0.6		—			10.9
Provision for income taxes	14.6			10.6			25.2			0.9		—			26.1
Preferred stock dividend requirements	(0.7		)	(0.1		)	(0.8		)	—		—			(0.8		)
Net income attributed to common shareholder	25.7			17.1			42.8			1.8		—			44.6