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Short-Term and Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Long-term Debt [Table Text Block] |
Long-Term Debt |  |
As of December 31 | 2015 |  | 2014 |
Millions |  |
First Mortgage Bonds |  |
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 |
2.80% Series Due 2020 | 40.0 |  | — |
4.85% Series Due 2021 | 15.0 |  | 15.0 |
3.02% Series Due 2021 | 60.0 |  | 60.0 |
3.40% Series Due 2022 | 75.0 |  | 75.0 |
6.02% Series Due 2023 | 75.0 |  | 75.0 |
3.69% Series Due 2024 | 60.0 |  | 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 |  | 50.0 |
3.86% Series Due 2030 | 60.0 |  | — |
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 |  | 40.0 |
5.05% Series Due 2044 | 40.0 |  | 40.0 |
4.39% Series Due 2044 | 50.0 |  | 50.0 |
Unsecured Term Loan Variable Rate Due 2015 | — |  | 75.0 |
Unsecured Term Loan Variable Rate Due 2017 | 125.0 |  | — |
Senior Unsecured Notes 5.99% Due 2017 | 50.0 |  | 50.0 |
Variable Demand Revenue Refunding Bonds Series 1997 A Due 2015 – 2020 | 13.5 |  | 24.6 |
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025 | 27.8 |  | 27.8 |
Armenia Mountain Senior Secured Notes 3.26% Due 2024 | 83.3 |  | — |
SWL&P First Mortgage Bonds 4.15% Series Due 2028 | 15.0 |  | 15.0 |
Other Long-Term Debt, 0.08% – 7.45% Due 2016 – 2037 | 68.4 |  | 59.1 |
Total Long-Term Debt | 1,605.0 |  | 1,373.5 |
Less: Due Within One Year | 36.3 |  | 100.7 |
Net Long-Term Debt |  | $1,568.7 |  |  | $1,272.8 |
On September 24, 2015, we issued $100.0 million of ALLETE first mortgage bonds (Bonds) in the private placement market as shown below:
Maturity Date | Principal Amount | Interest Rate
September 15, 2020 | $40 Million | 2.80%
September 16, 2030 | $60 Million | 3.86%

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