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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
NON-CASH INVESTING AND FINANCING ACTIVITIES
Installment payments for Tinker electric distribution system	$ 10.6	$ 0	$ 0
Power plant long-term service agreement	0	1.7	2.7
Future installment payments to wind farm developer	0	0	2.3
SUPPLEMENTAL CASH FLOW INFORMATION
Interest (net of interest capitalized)	122.1	108.2	100.2
Income taxes (net of income tax refunds)	(1.2)	4.5	(113.9)
Interest costs capitalized	$ 3.5	$ 10.4	$ 5.5

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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