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Short-Term and Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2014
Short-Term and Long-Term Debt [Abstract] |
Long-term Debt [Table Text Block] | During 2014, we issued $375.0 million of ALLETE first mortgage bonds (Bonds) in the private placement market as shown below:
Issue Date | Maturity Date | Principal Amount | Interest Rate
March 4, 2014 | March 15, 2024 | $60 Million | 3.69%
March 4, 2014 | March 15, 2044 | $40 Million | 4.95%
June 26, 2014 | July 15, 2022 | $75 Million | 3.40%
June 26, 2014 | July 15, 2044 | $40 Million | 5.05%
September 16, 2014 | September 15, 2021 | $60 Million | 3.02%
September 16, 2014 | September 15, 2029 | $50 Million | 3.74%
September 16, 2014 | September 15, 2044 | $50 Million | 4.39%
Long-Term Debt |  |
As of December 31 | 2014 |  | 2013 |
Millions |  |
First Mortgage Bonds |  |
6.94% Series Due 2014 | — |  | $18.0
7.70% Series Due 2016 | $20.0 | 20.0 |
1.83% Series Due 2018 | 50.0 |  | 50.0 |
8.17% Series Due 2019 | 42.0 |  | 42.0 |
5.28% Series Due 2020 | 35.0 |  | 35.0 |
4.85% Series Due 2021 | 15.0 |  | 15.0 |
3.02% Series Due 2021 | 60.0 |  | — |
3.40% Series Due 2022 | 75.0 |  | — |
4.95% Pollution Control Series F Due 2022 | — |  | 111.0 |
6.02% Series Due 2023 | 75.0 |  | 75.0 |
3.69% Series Due 2024 | 60.0 |  | — |
4.90% Series Due 2025 | 30.0 |  | 30.0 |
5.10% Series Due 2025 | 30.0 |  | 30.0 |
3.20% Series Due 2026 | 75.0 |  | 75.0 |
5.99% Series Due 2027 | 60.0 |  | 60.0 |
3.30% Series Due 2028 | 40.0 |  | 40.0 |
3.74% Series Due 2029 | 50.0 |  | — |
5.69% Series Due 2036 | 50.0 |  | 50.0 |
6.00% Series Due 2040 | 35.0 |  | 35.0 |
5.82% Series Due 2040 | 45.0 |  | 45.0 |
4.08% Series Due 2042 | 85.0 |  | 85.0 |
4.21% Series Due 2043 | 60.0 |  | 60.0 |
4.95% Series Due 2044 | 40.0 |  | — |
5.05% Series Due 2044 | 40.0 |  | — |
4.39% Series Due 2044 | 50.0 |  | — |
Unsecured Term Loan Variable Rate Due 2015 | 75.0 |  | 75.0 |
Senior Unsecured Notes 5.99% Due 2017 | 50.0 |  | 50.0 |
Variable Demand Revenue Refunding Bonds Series 1997 A Due 2015 – 2020 | 24.6 |  | 24.6 |
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025 | 27.8 |  | 27.8 |
SWL&P First Mortgage Bonds 4.15% Series Due 2028 | 15.0 |  | 15.0 |
Other Long-Term Debt, 0.08% – 7.50% Due 2015 – 2037 | 59.1 |  | 41.8 |
Total Long-Term Debt | 1,373.5 |  | 1,110.2 |
Less: Due Within One Year | 100.7 |  | 27.2 |
Net Long-Term Debt |  | $1,272.8 |  |  | $1,083.0 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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