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Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |
Total Property, Plant and Equipment - Net | $ 2,576.5 | $ 2,347.6
Asset Retirement Obligation [Roll Forward] |  |
Beginning Obligation | 77.9 | 57.0
Accretion Expense | 4.6 | 3.8
Revisions in estimated cash flows | (0.7) | 17.1
Ending Obligation | 81.8 | 77.9
Regulated Utiity [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment | 3,380.0 | 3,232.9
Construction Work in Progress | 303.9 | 151.8
Accumulated Depreciation | (1,181.7) | (1,102.8)
Property, Plant and Equipment - Net | 2,502.2 | 2,281.9
Regulated Utiity [Member] | Generation Plant [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 5 to 35 years |
Regulated Utiity [Member] | Transmission [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 42 to 61 years |
Regulated Utiity [Member] | Distribution [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 14 to 65 years |
Non-Rate Base Energy Operations and Other Plant [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment | 131.3 | 118.0
Construction Work in Progress | 3.4 | 4.2
Accumulated Depreciation | (60.4) | (56.7)
Property, Plant and Equipment - Net | 74.3 | 65.5
Other Plant - Net | $ 0 | $ 0.2
Non-Rate Base Energy Operations and Other Plant [Member] | Other Plant [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 5 to 25 years |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + 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 a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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