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Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets, Gross (as reported) | $ 26.7 | $ 26.2
Derivative assets, Net | 23.5 | 19.3
Derivative liabilities, Gross (as reported) | 20.8 | 40.4
Derivative liabilities, Net | 17.6 | 33.5
IPL [Member] |  |
Derivative [Line Items] |  |
Derivative assets, Gross (as reported) | 21.1 | 17.5
Derivative assets, Net | 19.5 | 14.5
Derivative liabilities, Gross (as reported) | 5.2 | 16.1
Derivative liabilities, Net | 3.6 | 13.1
WPL [Member] |  |
Derivative [Line Items] |  |
Derivative assets, Gross (as reported) | 5.6 | 8.7
Derivative assets, Net | 4.0 | 4.8
Derivative liabilities, Gross (as reported) | 15.6 | 24.3
Derivative liabilities, Net | $ 14.0 | $ 20.4

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