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Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Property, Plant and Equipment [Line Items] |  |  |
Total Property, Plant and Equipment - Net | $ 2,347.6 | $ 1,982.7 |
Asset Retirement Obligation [Roll Forward] |  |  |
Beginning Obligation | 57.0 | 50.3 |
Accretion Expense | 3.8 | 6.4 |
Additional Liabilities Incurred | 17.1 | 0.3 | 2.8
Ending Obligation | 77.9 | 57.0 | 50.3
Regulated Utiity [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | 3,232.9 | 2,794.8 |
Construction Work in Progress | 151.8 | 155.0 |
Accumulated Depreciation | (1,102.8) | (1,024.6) |
Property, Plant and Equipment - Net | 2,281.9 | 1,925.2 |
Estimated Useful Life - Generation | 3 to 35 years |  |
Estimated Useful Life - Transmission | 42 to 61 years |  |
Estimated Useful Life - Distribution | 14 to 65 years |  |
Non-Rate Base Energy Operations and Other Plant [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | 118.0 | 106.4 |
Construction Work in Progress | 4.2 | 2.3 |
Accumulated Depreciation | (56.7) | (51.4) |
Property, Plant and Equipment - Net | 65.5 | 57.3 |
Other Plant - Net | $ 0.2 | $ 0.2 |
Estimated Useful Life - Non-Rate Base Operations | 3 to 61 years |  |
Estimated Useful Life - Other Plant | 5 to 25 years |  |

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