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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment and Estimated Useful Lives of Property, Plant and Equipment [Table Text Block] |
Estimated Useful Lives of Property, Plant and Equipment
Regulated Operations |  |  | ALLETE Clean Energy | 5 to 44 years
Generation | 10 to 50 years |  | U.S. Water Services | 3 to 39 years
Transmission | 44 to 67 years |  | Corporate and Other | 3 to 39 years
Distribution | 18 to 65 years |  |  |
Property, Plant and Equipment |  |  |
As of December 31 | 2015 |  |  | 2014 |
Millions |  |  |
Regulated Operations |  | $4,336.7 |  |  |  | $3,903.3 |
Construction Work in Progress | 101.2 |  |  | 355.4 |
Accumulated Depreciation | (1,323.8 | ) |  | (1,260.2 | )
Regulated Operations – Net | 3,114.1 |  |  | 2,998.5 |
ALLETE Clean Energy | 467.3 |  |  | 203.7 |
Construction Work in Progress | 4.0 |  |  | 1.3 |
Accumulated Depreciation | (24.0 | ) |  | (8.4 | )
ALLETE Clean Energy – Net | 447.3 |  |  | 196.6 |
U.S. Water Services | 15.6 |  |  | — |
Accumulated Depreciation | (3.4 | ) |  | — |
U.S. Water Services – Net | 12.2 |  |  | — |
Corporate and Other (a) | 165.6 |  |  | 152.5 |
Construction Work in Progress | 4.5 |  |  | 4.6 |
Accumulated Depreciation | (74.6 | ) |  | (67.4 | )
Corporate and Other – Net | 95.5 |  |  | 89.7 |
Property, Plant and Equipment – Net |  | $3,669.1 |  |  |  | $3,284.8 |
(a) | Primarily includes BNI Energy and a small amount of non-rate base generation.
Asset Retirement Obligations [Table Text Block] |
Asset Retirement Obligations |  |
Millions |  |
Obligation as of December 31, 2013 |  |  | $81.8 |
Accretion |  | 5.5 |
Liabilities Recognized (a) |  | 23.0 |
Liabilities Settled |  | (0.5 | )
Revisions in Estimated Cash Flows |  | (0.6 | )
Obligation as of December 31, 2014 |  | 109.2 |
Accretion |  | 7.3 |
Liabilities Recognized (b) |  | 5.1 |
Liabilities Settled |  | (2.6 | )
Revisions in Estimated Cash Flows |  | 12.4 |
Obligation as of December 31, 2015 |  |  | $131.4 |
(a) | The increase in 2014 is related to BNI Energy for coal mining expansion and ALLETE Clean Energy due to wind energy facilities acquisitions.(See Note 7. Acquisitions.)
(b) | The increase in 2015 is related to the ALLETE Clean Energy wind energy facilities acquisitions in 2015. (See Note 7. Acquisitions.)

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: 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 2: 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 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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- 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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