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Derivative Instruments (Fair Value Of Financial Instruments) (Details) - Commodity Contracts [Member] - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Current derivative assets	$ 19.5	$ 30.5
Non-current derivative assets	0.8	8.1
Current derivative liabilities	35.4	28.1
Non-current derivative liabilities	23.7	9.5
IPL [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	17.8	27.4
Non-current derivative assets	0.7	0.6
Current derivative liabilities	15.2	16.4
Non-current derivative liabilities	6.8	3.1
WPL [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	1.7	3.1
Non-current derivative assets	0.1	7.5
Current derivative liabilities	20.2	11.7
Non-current derivative liabilities	$ 16.9	$ 6.4

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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