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Short-Term and Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Short-Term and Long-Term Debt [Table Text Block] |
December 31, 2018 | Principal |  |  | Unamortized Debt Issuance Costs |  | Total |
Millions |  |  |  |  |
Short-Term Debt |  | $57.9 |  |  | $(0.4) |  |  | $57.5 |
Long-Term Debt | 1,437.3 |  |  | (8.8) |  | 1,428.5 |
Total Debt |  | $1,495.2 |  |  | $(9.2) |  |  | $1,486.0 |
The following tables present the Company’s short-term and long-term debt as of March 31, 2019, and December 31, 2018:
March 31, 2019 | Principal |  |  | Unamortized Debt Issuance Costs |  | Total |
Millions |  |  |  |  |
Short-Term Debt |  | $14.7 |  |  | $(0.4) |  |  | $14.3 |
Long-Term Debt | 1,534.3 |  |  | (9.3) |  | 1,525.0 |
Total Debt |  | $1,549.0 |  |  | $(9.7) |  |  | $1,539.3 |
Schedule of Long-term Debt Instruments [Table Text Block] | On March 1, 2019, ALLETE issued and sold the following First Mortgage Bonds (the Bonds):
Maturity Date | Principal Amount | Interest Rate
March 1, 2029 | $70 Million | 4.08%
March 1, 2049 | $30 Million | 4.47%

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