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Transactions with Related Parties (Details) (Alabama Gas Corporation, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Alabama Gas Corporation
Related Party Transaction [Line Items]
Net trade receivables from affiliates	$ 2.8	$ 0.7
Interest expense in affiliated company	$ 0.4	$ 0.3	$ 0.2
Weighted average interest rate	1.72%	1.56%

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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