XML 84 R136.htm IDEA: XBRL DOCUMENT

Derivative Instruments (Balance Sheet Offsetting) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative assets, Gross (as reported)	$ 38.6	$ 26.7
Derivative assets, Net	33.0us-gaap_DerivativeAssets	23.5us-gaap_DerivativeAssets
Derivative liabilities, Gross (as reported)	37.6	20.8
Derivative liabilities, Net	32.0us-gaap_DerivativeLiabilities	17.6us-gaap_DerivativeLiabilities
IPL [Member]
Derivative [Line Items]
Derivative assets, Gross (as reported)	28.0	21.1
Derivative assets, Net	24.7	19.5
Derivative liabilities, Gross (as reported)	19.5	5.2
Derivative liabilities, Net	16.2	3.6
WPL [Member]
Derivative [Line Items]
Derivative assets, Gross (as reported)	10.6	5.6
Derivative assets, Net	8.3	4.0
Derivative liabilities, Gross (as reported)	18.1	15.6
Derivative liabilities, Net	$ 15.8	$ 14.0

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.

+ References+ Details

- 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.

+ References+ Details