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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2012
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment [Table Text Block] |
Property, Plant and Equipment |  |  |
As of December 31 | 2012 |  | 2011
Millions |  |  |
Regulated Utility |  | $3,232.9 |  |  |  | $2,794.8 |
Construction Work in Progress | 151.8 |  |  | 155.0 |
Accumulated Depreciation | (1,102.8 | ) |  | (1,024.6 | )
Regulated Utility Plant - Net | 2,281.9 |  |  | 1,925.2 |
Non-Rate Base Energy Operations | 118.0 |  |  | 106.4 |
Construction Work in Progress | 4.2 |  |  | 2.3 |
Accumulated Depreciation | (56.7 | ) |  | (51.4 | )
Non-Rate Base Energy Operations Plant - Net | 65.5 |  |  | 57.3 |
Other Plant - Net | 0.2 |  |  | 0.2 |
Property, Plant and Equipment - Net |  | $2,347.6 |  |  |  | $1,982.7 |
Estimated Useful Lives of Property, Plant and Equipment [Table Text Block] |
Estimated Useful Lives of Property, Plant and Equipment
Regulated Utility – | Generation | 3 to 35 years | Non-Rate Base Operations | 3 to 61 years
| Transmission | 42 to 61 years | Other Plant | 5 to 25 years
| Distribution | 14 to 65 years |  |
Asset Retirement Obligation [Table Text Block] |
Asset Retirement Obligation |  |
Millions |  |
Obligation as of December 31, 2010 |  |  | $50.3 |
Accretion Expense |  | 6.4 |
Additional Liabilities Incurred in 2011 |  | 0.3 |
Obligation as of December 31, 2011 |  | 57.0 |
Accretion Expense |  | 3.8 |
Additional Liabilities Incurred in 2012 |  | 17.1 |
Obligation as of December 31, 2012 |  |  | $77.9 |

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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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 4: 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 + 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 property plant and equipment. + 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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