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Supplemental Cash Flow Information | 12 Months Ended
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Dec. 31, 2016
Supplemental Cash Flow Information [Abstract] |
Cash Flow, Supplemental Disclosures [Text Block] | Supplemental Cash Flow Information The following table discloses information about investing and financing activities that affected recognized assets and liabilities but 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) | 2016 | 2015 | 2014
NON-CASH INVESTING AND FINANCING ACTIVITIES |  |  |
Power plant long-term service agreement | $ | 39.5 |  | $ | 2.3 |  | $ | — |
SUPPLEMENTAL CASH FLOW INFORMATION |  |  |
Cash paid during the period for |  |  |
Interest (net of interest capitalized) (A) | $ | 141.9 |  | $ | 145.4 |  | $ | 150.8 |
Income taxes (net of income tax refunds) | (5.9 | ) | (3.4 | ) | 0.2 |
(A) | Net of interest capitalized of $7.5 million, $4.2 million and $2.4 million in 2016, 2015 and 2014, respectively.

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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
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