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Derivative Instruments (Fair Value Of Financial Instruments) (Details) (Commodity Contracts [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Current derivative assets	$ 51.1	$ 23.5
Non-current derivative assets	9.4	2.7
Current derivative liabilities	21.8	31.1
Non-current derivative liabilities	15.3	9.3
IPL [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	44.4	17.0
Non-current derivative assets	0.7	0.5
Current derivative liabilities	8.4	14.1
Non-current derivative liabilities	1.3	2.0
WPL [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	6.7	6.5
Non-current derivative assets	8.7	2.2
Current derivative liabilities	13.4	17.0
Non-current derivative liabilities	$ 14.0	$ 7.3

X

- Definition

Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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