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Receivables (Advances For Customer Energy Efficiency Projects) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer advances, current portion	$ 14.9	$ 22.2
Customer advances, non-current portion	13.0	28.2
Customer advances	27.9	50.4
IPL [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer advances, current portion	0.8	1.7
Customer advances, non-current portion	0.6	1.7
Customer advances	1.4	3.4
WPL [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer advances, current portion	14.1	20.5
Customer advances, non-current portion	12.4	26.5
Customer advances	$ 26.5	$ 47.0

An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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