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Derivative Instruments (Balance Sheet Offsetting) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative Instruments [Line Items]
Derivative assets, Gross (as reported)	$ 16.9	$ 38.6
Derivative assets, Net	10.3us-gaap_DerivativeAssets	33.0us-gaap_DerivativeAssets
Derivative liabilities, Gross (as reported)	42.7	37.6
Derivative liabilities, Net	36.1us-gaap_DerivativeLiabilities	32.0us-gaap_DerivativeLiabilities
IPL [Member]
Derivative Instruments [Line Items]
Derivative assets, Gross (as reported)	6.5	28.0
Derivative assets, Net	5.1	24.7
Derivative liabilities, Gross (as reported)	20.0	19.5
Derivative liabilities, Net	18.6	16.2
WPL [Member]
Derivative Instruments [Line Items]
Derivative assets, Gross (as reported)	10.4	10.6
Derivative assets, Net	5.2	8.3
Derivative liabilities, Gross (as reported)	22.7	18.1
Derivative liabilities, Net	$ 17.5	$ 15.8

Fair value, after the effects of master netting arrangements, of a financial asset or other 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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