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Business Segments (Tables) | 9 Months Ended
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Sep. 30, 2015
Business Segments [Abstract] |
Business Segments [Table Text Block] |
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2015 | 2014 |  | 2015 | 2014
Millions |  |  |  |  |
Operating Revenue |  |  |  |  |
Regulated Operations | $250.2 | $255.8 |  | $743.0 | $749.6
Energy Infrastructure and Related Services |  |  |  |  |
ALLETE Clean Energy | 151.1 |  | 6.8 |  |  | 197.5 |  | 22.6 |
U.S. Water Services | 36.1 |  | — |  |  | 86.0 |  | — |
Corporate and Other | 25.1 |  | 26.3 |  |  | 79.3 |  | 73.9 |
Total Operating Revenue |  | $462.5 |  |  | $288.9 |  |  |  | $1,105.8 |  |  | $846.1 |
Net Income (Loss) Attributable to ALLETE |  |  |  |  |
Regulated Operations (a) |  | $43.8 |  |  | $40.9 |  |  |  | $108.1 |  |  | $91.6 |
Energy Infrastructure and Related Services |  |  |  |  |
ALLETE Clean Energy | 13.2 |  | 0.5 |  |  | 18.7 |  | 1.2 |
U.S. Water Services | 1.0 |  | — |  |  | 1.5 |  | — |
Corporate and Other (a) | 2.4 |  | 0.2 |  |  | (5.5 | ) | (0.9 | )
Total Net Income Attributable to ALLETE |  | $60.4 |  |  | $41.6 |  |  |  | $122.8 |  |  | $91.9 |
(a) | During the third quarter of 2015, the Company entered into an intercompany loan agreement, and allocated long-term debt to ALLETE Transmission Holdings, which owns approximately 8 percent of ATC, to better reflect the capital requirements of ALLETE Transmission Holdings and our investment in ATC. ALLETE Transmission Holdings recognized interest expense of approximately $0.3 million after-tax in the third quarter of 2015 which is reflected in our Regulated Operations segment. Our Corporate and Other segment recognized interest income of the same amount. The amounts are eliminated in consolidation. Prior period segment results have been revised to conform to the current presentation as if the intercompany loan existed as of January 1, 2014.
As of September 30, | 2015 |  | 2014 |
Millions |  |
Assets |  |
Regulated Operations | $3,836.3 | $3,519.9
Energy Infrastructure and Related Services |  |
ALLETE Clean Energy | 565.7 |  | 184.4 |
U.S. Water Services | 257.8 |  | — |
Corporate and Other | 272.0 |  | 363.6 |
Total Assets |  | $4,931.8 |  |  | $4,067.9 |

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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 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 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=51669610&loc=d3e8813-108599 Reference 3: 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=51669610&loc=d3e8721-108599 Reference 4: 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 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=51669610&loc=d3e8736-108599 + Details
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