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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2013
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment [Table Text Block] |
Property, Plant and Equipment |  |  |
As of December 31 | 2013 |  | 2012
Millions |  |  |
Regulated Utility |  | $3,380.0 |  |  |  | $3,232.9 |
Construction Work in Progress | 303.9 |  |  | 151.8 |
Accumulated Depreciation | (1,181.7 | ) |  | (1,102.8 | )
Regulated Utility Plant - Net | 2,502.2 |  |  | 2,281.9 |
Non-Rate Base Energy Operations | 131.3 |  |  | 118.0 |
Construction Work in Progress | 3.4 |  |  | 4.2 |
Accumulated Depreciation | (60.4 | ) |  | (56.7 | )
Non-Rate Base Energy Operations Plant - Net | 74.3 |  |  | 65.5 |
Other Plant - Net | — |  |  | 0.2 |
Property, Plant and Equipment - Net |  | $2,576.5 |  |  |  | $2,347.6 |
Estimated Useful Lives of Property, Plant and Equipment [Table Text Block] |
Estimated Useful Lives of Property, Plant and Equipment
Generation | 5 to 35 years |  | Distribution | 14 to 65 years
Transmission | 42 to 61 years |  | Other Plant | 5 to 25 years
Asset Retirement Obligation [Table Text Block] |
Asset Retirement Obligation |  |
Millions |  |
Obligation as of December 31, 2011 |  |  | $57.0 |
Accretion Expense |  | 3.8 |
Revisions in estimated cash flows |  | 17.1 |
Obligation as of December 31, 2012 |  | 77.9 |
Accretion Expense |  | 4.6 |
Revisions in estimated cash flows |  | (0.7 | )
Obligation as of December 31, 2013 |  |  | $81.8 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499596&loc=d3e42232-110370 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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