SEGMENTS OF BUSINESS (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Schedule of information related to reportable segments

The table below presents information related to our reportable segments:

	Regulated Utilities
2013 (Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Income Statement
External revenues	$	1,241.8		$	337.5		$	1,579.3		$	—	$	—		$	1,579.3
Intersegment revenues	—			10.9			10.9			1.4		(12.3		)	—
Depreciation and amortization expense	90.5			15.6			106.1			0.6		(0.5		)	106.2
Miscellaneous income	9.9			0.2			10.1			13.4		—			23.5
Interest expense	33.0			8.5			41.5			2.2		—			43.7
Provision for income taxes	61.6			16.1			77.7			4.2		—			81.9
Preferred stock dividend requirements	(2.5		)	(0.6		)	(3.1		)	—		—			(3.1		)
Net income attributed to common shareholder	102.3			25.0			127.3			7.5		—			134.8
Total Assets	3,241.8			633.8			3,875.6			85.7		—			3,961.3
Cash expenditures for long-lived assets	595.5			37.7			633.2			—		—			633.2
	Regulated Utilities
2012 (Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Income Statement
External revenues	$	1,212.0		$	287.2		$	1,499.2		$	—	$	—		$	1,499.2
Intersegment revenues	—			9.2			9.2			1.4		(10.6		)	—
Depreciation and amortization expense	81.1			15.0			96.1			0.6		(0.5		)	96.2
Miscellaneous income	2.6			0.1			2.7			13.0		—			15.7
Interest expense	32.4			7.9			40.3			2.2		—			42.5
Provision for income taxes	44.6			14.5			59.1			3.5		—			62.6
Preferred stock dividend requirements	(2.5		)	(0.6		)	(3.1		)	—		—			(3.1		)
Net income attributed to common shareholder	99.1			24.9			124.0			7.7		—			131.7
Total Assets	2,747.5			668.2			3,415.7			106.2		—			3,521.9
Cash expenditures for long-lived assets	149.4			30.1			179.5			—		—			179.5
	Regulated Utilities
2011 (Millions)	Electric Utility			Natural Gas Utility			Total Utility			Other		Reconciling Eliminations			WPS Consolidated
Income Statement
External revenues	$	1,220.7		$	342.4		$	1,563.1		$	—	$	—		$	1,563.1
Intersegment revenues	—			10.2			10.2			1.4		(11.6		)	—
Depreciation and amortization expense	80.8			14.7			95.5			0.6		(0.5		)	95.6
Miscellaneous income (expense)	0.6			(0.1		)	0.5			12.7		—			13.2
Interest expense	38.1			9.0			47.1			2.4		—			49.5
Provision for income taxes	55.5			14.2			69.7			3.5		—			73.2
Preferred stock dividend requirements	(2.5		)	(0.6		)	(3.1		)	—		—			(3.1		)
Net income attributed to common shareholder	93.9			22.3			116.2			6.6		—			122.8
Total Assets	2,689.8			632.7			3,322.5			105.0		—			3,427.5
Cash expenditures for long-lived assets	68.5			22.7			91.2			0.3		—			91.5