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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2014
Supplemental Cash Flow Information [Abstract] |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | The following table discloses information about investing and financing activities that affected recognized assets and liabilities but which did not result in cash receipts or payments. Also disclosed in the table is cash paid for interest, net of interest capitalized, and cash paid for income taxes, net of income tax refunds.
Year ended December 31 (In millions) | 2014 | 2013 | 2012
NON-CASH INVESTING AND FINANCING ACTIVITIES |  |  |
Installment payments for Tinker electric distribution system | $ | — |  | $ | — |  | $ | 10.6 |
Power plant long-term service agreement | — |  | 9.7 |  | — |
Investment in Enable (Note 3) | — |  | 1,248.6 |  | — |
SUPPLEMENTAL CASH FLOW INFORMATION |  |  |
Cash Paid During the Period for |  |  |
Interest (net of interest capitalized) (A) | $ | 150.8 |  | $ | 151.1 |  | $ | 161.3 |
Income taxes (net of income tax refunds) | 0.2 |  | (1.1 | ) | (9.1 | )
(A) | Net of interest capitalized of $2.4 million, $5.4 million and $8.0 million in 2014, 2013 and 2012, respectively.

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