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Business Segments | 3 Months Ended
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Mar. 31, 2015
Business Segments [Abstract] |
Business Segments [Text Block] | BUSINESS SEGMENTS Regulated Operations includes our regulated utilities, Minnesota Power and SWL&P, as well as our investment in ATC, a Wisconsin-based regulated utility that owns and maintains electric transmission assets in parts of Wisconsin, Michigan, Minnesota and Illinois. Investments and Other is comprised primarily of our Energy Infrastructure and Related Services businesses: ALLETE Clean Energy, our business aimed at acquiring or developing capital projects that create energy solutions by way of wind, solar, biomass, hydro, natural gas, shale resources, clean coal technology and other emerging energy innovations, U.S. Water Services, our integrated water management company which was acquired on February 10, 2015, and BNI Coal, our coal mining operations in North Dakota. Investments and Other also includes ALLETE Properties, our Florida real estate investment, and other business development and corporate expenditures, unallocated interest expense, a small amount of non-rate base generation, approximately 5,000 acres of land in Minnesota, and earnings on cash and investments. Future acquisitions or growth may impact segment reporting.
| Consolidated |  | Regulated Operations |  | Investments and Other |
Millions |  |  |
Three Months Ended March 31, 2015 |  |  |
Operating Revenue |  | $320.0 |  |  | $262.8 |  |  | $57.2 |
Fuel and Purchased Power | 86.0 |  | 86.0 |  | — |
Transmission Services | 14.9 |  | 14.9 |  | — |
Cost of Sales | 31.2 |  | 4.5 |  | 26.7 |
Operating and Maintenance | 79.7 |  | 58.7 |  | 21.0 |
Depreciation and Amortization | 39.0 |  | 32.1 |  | 6.9 |
Taxes Other than Income Taxes | 12.8 |  | 11.6 |  | 1.2 |
Operating Income | 56.4 |  | 55.0 |  | 1.4 |
Interest Expense | (15.1 | ) | (13.0 | ) | (2.1 | )
Equity Earnings in ATC | 3.9 |  | 3.9 |  | — |
Other Income | 1.1 |  | 0.9 |  | 0.2 |
Income (Loss) Before Non-Controlling Interest and Income Taxes | 46.3 |  | 46.8 |  | (0.5 | )
Income Tax Expense | 6.2 |  | 5.4 |  | 0.8 |
Net Income (Loss) | 40.1 |  | 41.4 |  | (1.3 | )
Less: Non-Controlling Interest in Subsidiaries | 0.2 |  | — |  | 0.2 |
Net Income (Loss) Attributable to ALLETE |  | $39.9 |  |  | $41.4 |  | $(1.5)
As of March 31, 2015 |  |  |
Total Assets |  | $4,580.1 |  |  | $3,748.4 |  |  | $831.7 |
Property, Plant and Equipment – Net |  | $3,319.2 |  |  | $3,025.3 |  |  | $293.9 |
Accumulated Depreciation |  | $1,367.0 |  |  | $1,286.9 |  |  | $80.1 |
Capital Additions |  | $57.3 |  |  | $54.9 |  |  | $2.4 |
NOTE 2. BUSINESS SEGMENTS (Continued)
| Consolidated |  | Regulated Operations |  | Investments and Other |
Millions |  |  |
Three Months Ended March 31, 2014 |  |  |
Operating Revenue |  | $296.5 |  |  | $264.2 |  |  | $32.3 |
Fuel and Purchased Power | 96.2 |  | 96.2 |  | — |
Transmission Services | 10.8 |  | 10.8 |  | — |
Cost of Sales | 23.5 |  | 8.7 |  | 14.8 |
Operating and Maintenance | 74.3 |  | 60.5 |  | 13.8 |
Depreciation and Amortization | 32.2 |  | 28.8 |  | 3.4 |
Taxes Other than Income Taxes | 11.2 |  | 10.2 |  | 1.0 |
Operating Income (Loss) | 48.3 |  | 49.0 |  | (0.7 | )
Interest Expense | (12.8 | ) | (11.5 | ) | (1.3 | )
Equity Earnings in ATC | 5.1 |  | 5.1 |  | — |
Other Income | 2.0 |  | 1.8 |  | 0.2 |
Income (Loss) Before Non-Controlling Interest and Income Taxes | 42.6 |  | 44.4 |  | (1.8 | )
Income Tax Expense (Benefit) | 8.8 |  | 10.5 |  | (1.7 | )
Net Income (Loss) | 33.8 |  | 33.9 |  | (0.1 | )
Less: Non-Controlling Interest in Subsidiaries | 0.3 |  | — |  | 0.3 |
Net Income (Loss) Attributable to ALLETE |  | $33.5 |  |  | $33.9 |  | $(0.4)
As of March 31, 2014 |  |  |  |  |  |
Total Assets |  | $3,749.2 |  |  | $3,335.5 |  |  | $413.7 |
Property, Plant and Equipment – Net |  | $2,905.1 |  |  | $2,671.3 |  |  | $233.8 |
Accumulated Depreciation |  | $1,266.7 |  |  | $1,202.9 |  |  | $63.8 |
Capital Additions |  | $195.2 |  |  | $193.5 |  |  | $1.7 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599 + Details
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