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Business Segments (Tables) | 3 Months Ended
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Mar. 31, 2015
Business Segments [Abstract] |
Business Segments [Table Text Block] |
| 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 Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 + Details
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