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Commitments, Guarantees and Contingencies - Transmission (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CapX2020 [Member]
Transmission [Line Items]
Number of Projects	3
Minimum Amount Expected to be Invested in Transmission Projects	$ 100
Maximum Amount Expected to be Invested in Transmission Projects	110
Capital Cost Spent to Date	48.2	27.8
CapX2020 Fargo to Monticello Project [Member]
Transmission [Line Items]
Transmission Line Length (Miles)	238
Transmission Line Capacity (kV)	345
Capital Cost Spent to Date	37.3	20.4
CapX2020 Monticello to St. Cloud Project [Member]
Transmission [Line Items]
Transmission Line Length (Miles)	28
Transmission Line Capacity (kV)	345
CapX2020 Bemidji to Grand Rapids Project [Member]
Transmission [Line Items]
Transmission Line Length (Miles)	70
Transmission Line Capacity (kV)	230
Capital Cost Spent to Date	$ 10.9	$ 7.4