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Condensed Parent Company Financial Statements (Details 6) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Financial Instruments
Long-term debt including current portion, carrying value	$ 4,541.4	$ 4,288.0
Long-term debt including current portion, fair value	5,179.9	4,578.0
Carrying Amount [Member] \| Wisconsin Energy Corporation [Member]
Financial Instruments
Long-term debt including current portion, carrying value	700.0	1,150.0
Fair Value [Member] \| Wisconsin Energy Corporation [Member]
Financial Instruments
Long-term debt including current portion, fair value	$ 750.8	$ 1,217.4

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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