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Debt (Credit Facilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Amount outstanding	$ 102.8	$ 47.4
Weighted average interest rates	0.30%	0.30%
IPL [Member]
Amount outstanding	7.1
Weighted average interest rates	0.40%	0.00%
WPL [Member]
Amount outstanding	$ 25.7	$ 47.4
Weighted average interest rates	0.30%	0.30%

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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