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Investments (Cash Surrender Value Of Life Insurance Policies) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Cash surrender value	$ 49.2	$ 48.3
IPL [Member]
Cash surrender value	15.1	14.3
WPL [Member]
Cash surrender value	$ 11.9	$ 12.4

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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