Condensed Parent Company Financial Statements (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 26.0		$ 35.6		$ 14.1		$ 24.5
Prepaid taxes and other	145.7		145.5
Total Current Assets	1,551.1		1,272.6
Property and Investments
Investment in subsidiary companies	402.7		378.3
Other	322.5		204.2
Total Deferred Charges and Other Assets	1,872.9		2,026.4
Total Assets	14,769.4	[1]	14,285.0	[1]	13,862.1	[1]
Current Liabilities
Short-term debt	537.4		394.6
Other	177.3		165.4
Total Current Liabilities	1,496.4		1,441.4
Long-term debt	4,363.2		4,453.8
Other Long-term liabilities	295.9		285.2
Stockholder's equity	4,233.0		4,135.1		3,963.3		3,802.1
Total Capitalization and Liabilities	14,769.4		14,285.0
Wisconsin Energy Corporation [Member]
Current Assets
Cash and cash equivalents	0.3		0.9		0.5		0.6
Accounts and notes receivable from associated companies	37.4		32.9
Prepaid taxes and other	297.6		176.3
Total Current Assets	335.3		210.1
Property and Investments
Investment in subsidiary companies	4,761.8		4,662.3
Other	1.8		2.1
Total Property and Investments	4,763.6		4,664.4
Total Deferred Charges and Other Assets	143.2		331.4
Total Assets	5,242.1		5,205.9
Current Liabilities
Short-term debt	72.0		67.0
Notes payable due associated companies	113.8		140.6
Other	11.8		34.7
Total Current Liabilities	197.6		242.3
Long-term debt	695.0		694.3
Other Long-term liabilities	116.5		134.2
Stockholder's equity	4,233.0		4,135.1
Total Capitalization and Liabilities	$ 5,242.1		$ 5,205.9

[1] An elimination of $2,231.2 million, $2,286.7 million and $2,369.0 million is included in Total Assets as of December 31, 2013, 2012 and 2011, respectively, for all PTF-related activity between We Power and Wisconsin Electric.