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Derivative Instruments (Fair Value Of Financial Instruments) (Details) - Commodity Contracts [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Current derivative assets	$ 21.1	$ 29.4
Non-current derivative assets	4.0	12.0
Current derivative liabilities	18.7	13.3
Non-current derivative liabilities	23.0	15.3
IPL [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	15.8	19.1
Non-current derivative assets	1.3	1.7
Current derivative liabilities	5.0	2.7
Non-current derivative liabilities	14.4	5.6
WPL [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	5.3	10.3
Non-current derivative assets	2.7	10.3
Current derivative liabilities	13.7	10.6
Non-current derivative liabilities	$ 8.6	$ 9.7

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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