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Condensed Parent Company Financial Statements (Details 6) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial Instruments
Long-term debt including current portion, carrying value	$ 4,772.9	$ 4,541.4
Long-term debt including current portion, fair value	5,447.3	5,179.9
Carrying Amount [Member] \| Wisconsin Energy Corporation [Member]
Financial Instruments
Long-term debt including current portion, carrying value	700.0	700.0
Fair Value [Member] \| Wisconsin Energy Corporation [Member]
Financial Instruments
Long-term debt including current portion, fair value	$ 805.9	$ 750.8

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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