Acquisition (Tables)

6 Months Ended

Jun. 30, 2015

Business Combinations [Abstract]

Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable [Table Text Block]

The total consideration transferred was based on the closing price of Wisconsin Energy common stock on June 29, 2015, and was calculated as follows:

	Stock		Cash		Total
	(Millions of Dollars, except per share amounts)
Integrys common shares outstanding at June 29, 2015	79,963,091		79,963,091
Exchange ratio	1.128
Wisconsin Energy shares issued for Integrys shares (a)	90,187,884
Closing price of Wisconsin Energy common shares on June 29, 2015	$45.16
Fair value of common stock issued	$	4,072.9			$	4,072.9
Cash paid per share of Integrys shares outstanding			$18.58
Fair value of cash paid for Integrys shares (a)			$	1,486.2	$	1,486.2
Consideration attributable to settlement of equity awards, net of tax			$	24.0	$	24.0
Total purchase price	$	4,072.9	$	1,510.2	$	5,583.1
(a) 10,483 fractional shares totaling $0.5 million were paid in cash.

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

The preliminary purchase price allocation of the acquisition was as follows:

	(Millions of Dollars)
Current assets	$	1,178.2
Net property, plant and equipment	7,098.2
Goodwill	2,944.6
Deferred charges and other assets, excluding goodwill	2,410.5
Current liabilities, including current maturities of long-term debt	(1,260.1		)
Deferred credits and other liabilities	(3,769.6		)
Long-term debt	(2,967.6		)
Preferred stock of subsidiary	(51.1		)
Total purchase price	$	5,583.1

Business Acquisition, Pro Forma Information [Table Text Block]

Unaudited Pro Forma Financial Information	Three Months Ended June 30				Six Months Ended June 30
	2015		2014		2015		2014
	(Millions of Dollars, Except Per Share Amounts)
Operating Revenues	$	1,629.2	$	1,879.5	$	4,180.1	$	5,208.2
Net Income	$	159.1	$	143.2	$	488.7	$	499.5
Earnings per share (Basic)	$	0.50	$	0.46	$	1.55	$	1.54
Earnings per share (Diluted)	$	0.50	$	0.45	$	1.54	$	1.53