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Short-Term and Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Short-Term and Long-Term Debt [Table Text Block] | The following tables present the Company’s short-term and long-term debt as of June 30, 2020, and December 31, 2019:
June 30, 2020 | Principal |  | Unamortized Debt Issuance Costs |  | Total
Millions |  |  |  |  |
Short-Term Debt | $510.0 |  |  | $(0.3) |  | $509.7 |
Long-Term Debt | 1,389.0 |  |  | (8.0) |  | 1,381.0 |
Total Debt | $1,899.0 |  |  | $(8.3) |  | $1,890.7 |
December 31, 2019 | Principal |  | Unamortized Debt Issuance Costs |  | Total
Millions |  |  |  |  |
Short-Term Debt | $213.3 |  |  | $(0.4) |  | $212.9 |
Long-Term Debt | 1,409.3 |  |  | (8.4) |  | 1,400.9 |
Total Debt | $1,622.6 |  |  | $(8.8) |  | $1,613.8 |
Schedule of Long-term Debt Instruments [Table Text Block] | On March 26, 2020, ALLETE agreed to sell first mortgage bonds (Bonds) to certain institutional buyers in the private placement market, which were issued on August 3, 2020, in two series as follows:
Maturity Date | Principal Amount | Interest Rate
August 1, 2030 | $46 Million | 2.50%
August 1, 2050 | $94 Million | 3.30%

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