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Business Segments (Tables) | 6 Months Ended
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Jun. 30, 2018
Segment Reporting [Abstract] |
Business Segments [Table Text Block] |
| Quarter Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2018 | 2017 |  | 2018 | 2017
Millions |  |  |  |  |
Operating Revenue (a) |  |  |  |  |
Regulated Operations |  |  |  |  |
Residential |  | $30.7 |  |  | $27.6 |  |  |  | $71.4 |  |  | $67.1 |
Commercial | 36.2 |  | 33.7 |  |  | 72.8 |  | 71.9 |
Municipal | 13.7 |  | 12.3 |  |  | 27.7 |  | 30.5 |
Industrial | 115.3 |  | 121.6 |  |  | 230.2 |  | 243.3 |
Other Power Suppliers | 42.7 |  | 41.7 |  |  | 86.4 |  | 82.9 |
CIP Financial Incentive (b) | — |  | 5.5 |  |  | — |  | 5.5 |
Other | 19.2 |  | 22.5 |  |  | 39.5 |  | 45.3 |
Total Regulated Operations | 257.8 |  | 264.9 |  |  | 528.0 |  | 546.5 |
Energy Infrastructure and Related Services |  |  |  |  |
ALLETE Clean Energy |  |  |  |  |
Long-term PSA | 12.4 |  | 13.7 |  |  | 31.0 |  | 31.5 |
Other | 5.9 |  | 5.9 |  |  | 11.9 |  | 11.8 |
Total ALLETE Clean Energy | 18.3 |  | 19.6 |  |  | 42.9 |  | 43.3 |
U.S. Water Services |  |  |  |  |
Point-in-Time | 25.7 |  | 23.9 |  |  | 48.0 |  | 45.7 |
Contract | 9.5 |  | 8.8 |  |  | 19.0 |  | 17.7 |
Capital Project | 6.3 |  | 5.7 |  |  | 12.7 |  | 7.1 |
Total U.S. Water Services | 41.5 |  | 38.4 |  |  | 79.7 |  | 70.5 |
Corporate and Other |  |  |  |  |  |  |
Long-term Contract | 22.7 |  | 23.2 |  |  | 42.7 |  | 45.3 |
Other | 3.8 |  | 7.2 |  |  | 9.0 |  | 13.3 |
Total Corporate and Other | 26.5 |  | 30.4 |  |  | 51.7 |  | 58.6 |
Total Operating Revenue |  | $344.1 |  |  | $353.3 |  |  |  | $702.3 |  |  | $718.9 |
Net Income (Loss) |  |  |  |  |
Regulated Operations |  | $26.0 |  |  | $32.4 |  |  |  | $69.9 |  |  | $75.9 |
Energy Infrastructure and Related Services |  |  |  |  |
ALLETE Clean Energy | 6.8 |  | 3.8 |  |  | 14.9 |  | 10.5 |
U.S. Water Services | 0.2 |  | 0.6 |  |  | (1.2 | ) | 0.3 |
Corporate and Other | (1.7 | ) | 0.1 |  |  | (1.3 | ) | (0.8 | )
Total Net Income |  | $31.3 |  |  | $36.9 |  |  |  | $82.3 |  |  | $85.9 |
(a) | With the adoption of new revenue recognition guidance, the Company has enhanced the presentation of business segment Operating Revenue. (See Note 1. Operations and Significant Accounting Policies.)
(b) | See Note 6. Regulatory Matters.
NOTE 14. BUSINESS SEGMENTS (Continued)
| June 30, 2018 |  | December 31, 2017 |
Millions |  |
Assets |  |
Regulated Operations |  | $3,898.2 |  |  | $3,886.6 |
Energy Infrastructure and Related Services |  |
ALLETE Clean Energy | 620.2 |  | 600.5 |
U.S. Water Services | 291.8 |  | 292.4 |
Corporate and Other | 304.5 |  | 300.5 |
Total Assets |  | $5,114.7 |  |  | $5,080.0 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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