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Commitments, Guarantees and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |  |  |
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Jun. 30, 2011 mW kV Mi mWh | Jun. 30, 2011 North Dakota Wind Development Bison 1 [Member] mW | Jun. 30, 2011 North Dakota Wind Development Bison 2 [Member] mW | Jun. 30, 2011 North Dakota Wind Development Bison 3 [Member] mW | Jun. 30, 2011 BNI Coal Reclamation Project [Member] | Jun. 30, 2011 Allete Properties Performance and Maintenance Obligations [Member] | Jun. 30, 2011 Town Center Community Development District [Member] | Dec. 31, 2010 Town Center Community Development District [Member] | Jun. 30, 2011 Palm Coast Park Community Development District [Member] | Dec. 31, 2010 Palm Coast Park Community Development District [Member]
Square Butte PPA |  |  |  |  |  |  |  |  |  |
Square Butte expiration date | Dec. 31, 2026 |  |  |  |  |  |  |  |  |
Coal-fired generating unit capacity | 455 |  |  |  |  |  |  |  |  |
Total debt outstanding for power cooperative corporation | $ 424.1 |  |  |  |  |  |  |  |  |
Annual debt service for power cooperative corporation | 39.0 |  |  |  |  |  |  |  |  |
Portion of debt service obligation on debt for power cooperative corporation (in hundredths) | 50.00% |  |  |  |  |  |  |  |  |
Minnkota Power Sales Agreement |  |  |  |  |  |  |  |  |  |
DC transmission line capacity | 250 |  |  |  |  |  |  |  |  |
Minnkota Power expiration date | Dec. 31, 2025 |  |  |  |  |  |  |  |  |
DC transmission line length | 465 |  |  |  |  |  |  |  |  |
Wind PPAs |  |  |  |  |  |  |  |  |  |
Number of long-term wind PPAs | 2 |  |  |  |  |  |  |  |  |
Oliver I capacity | 50 |  |  |  |  |  |  |  |  |
Oliver II capacity | 48 |  |  |  |  |  |  |  |  |
Length of wind PPAs | 25Y |  |  |  |  |  |  |  |  |
Hydro PPAs |  |  |  |  |  |  |  |  |  |
Manitoba Hydro expiration date | Apr. 30, 2015 |  |  |  |  |  |  |  |  |
Manitoba Hydro capacity | 50 |  |  |  |  |  |  |  |  |
Manitoba Hydro surplus energy start date | May 01, 2011 |  |  |  |  |  |  |  |  |
Manitoba Hydro surplus energy end date | Apr. 30, 2022 |  |  |  |  |  |  |  |  |
Minimum surplus energy | 1,000,000 |  |  |  |  |  |  |  |  |
North Dakota Wind Development |  |  |  |  |  |  |  |  |  |
Total expected capital cost |  | 177.0 | 160.0 | 160.0 |  |  |  |  |  |
Total capital costs spent |  | 137.4 |  |  |  |  |  |  |  |
Total wind development capacity |  | 82 | 105 | 105 |  |  |  |  |  |
Length of phase one transmission line | 22 |  |  |  |  |  |  |  |  |
Capacity of phase one transmission line | 230 |  |  |  |  |  |  |  |  |
Number of phase one turbines | 16 |  |  |  |  |  |  |  |  |
Capacity of phase one turbines | 2.3 |  |  |  |  |  |  |  |  |
Number of phase two turbines | 15 |  |  |  |  |  |  |  |  |
Capacity of phase two turbines | 3.0 |  |  |  |  |  |  |  |  |
Leasing Agreements |  |  |  |  |  |  |  |  |  |
Leasing agreement expiration date | Dec. 31, 2027 |  |  |  |  |  |  |  |  |
Dragline lease | 2.8 |  |  |  |  |  |  |  |  |
Termination fee | 3.0 |  |  |  |  |  |  |  |  |
Operating leases, future minimum payment obligation, current year | 8.1 |  |  |  |  |  |  |  |  |
Operating leases, future minimum payment obligation, in two years | 8.4 |  |  |  |  |  |  |  |  |
Operating leases, future minimum payment obligation, in three years | 8.5 |  |  |  |  |  |  |  |  |
Operating leases, future minimum payment obligation, in four years | 8.7 |  |  |  |  |  |  |  |  |
Operating leases, future minimum payment obligation, in five years | 8.4 |  |  |  |  |  |  |  |  |
Operating leases, future minimum payment obligation, thereafter | 44.7 |  |  |  |  |  |  |  |  |
Coal, Rail and Shipping Contracts |  |  |  |  |  |  |  |  |  |
Minimum annual payment obligations for purchase contracts, current year | 31.8 |  |  |  |  |  |  |  |  |
Minimum annual payment obligations for purchase contracts, year two | 15.8 |  |  |  |  |  |  |  |  |
Minimum annual payment obligations for purchase contracts, year three | 16.3 |  |  |  |  |  |  |  |  |
Transmission |  |  |  |  |  |  |  |  |  |
Amount spent for transmission line projects | 17.5 |  |  |  |  |  |  |  |  |
Minimum amount expected to be invested in transmission line projects | 100.0 |  |  |  |  |  |  |  |  |
Maximum amount expected to be invested in transmission line projects | 125.0 |  |  |  |  |  |  |  |  |
Length of Fargo to Monticello transmission line | 238 |  |  |  |  |  |  |  |  |
Capacity of Fargo to Monticello transmission line | 345 |  |  |  |  |  |  |  |  |
Length of Bemidji to Grand Rapids transmission line | 70 |  |  |  |  |  |  |  |  |
Capacity of Bemidji to Grand Rapids line | 230 |  |  |  |  |  |  |  |  |
Solid And Hazardous Waste |  |  |  |  |  |  |  |  |  |
Amount of liability for manufactured gas site | 0.5 |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |
Total current estimated reclamation liability | 8.0 |  |  |  |  |  |  |  |  |
Interest rate on tax-exempt capital improvement revenue bonds (in hundredths) |  |  |  |  |  |  | 6.00% |  | 5.70% |
Ownership percentage of benefited property |  |  |  |  |  |  | 73.00% | 69.00% | 93.00% | 93.00%
Annual assessments on projects at current ownership level |  |  |  |  |  |  | 1.5 |  | 2.2 |
Surety bonds |  |  |  |  | 29.7 | 10.2 |  |  |  |
Capital improvement and special assessment bonds (dollars) |  |  |  |  |  |  | 26.4 |  | 31.8 |
Capital improvement and special assessment bonds payable | 31Y |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |
Amount of damages being sought from Company related to lawsuit from fire as a result of failure of certain electrical protective equipment | $ 20.0 |  |  |  |  |  |  |  |  |

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant