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Short-Term and Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

First Mortgage Bonds Issued March 1, 2019 [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%

Long-term Debt [Table Text Block]

Long-Term Debt
As of December 31	2019			2018
Millions
First Mortgage Bonds
8.17% Series Due 2019	—				$42.0
5.28% Series Due 2020		$35.0		35.0
2.80% Series Due 2020	40.0			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
4.08% Series Due 2029	70.0			—
3.74% Series Due 2029	50.0			50.0
3.86% Series Due 2030	60.0			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
4.07% Series Due 2048	60.0			60.0
4.47% Series Due 2049	30.0			—
Variable Demand Revenue Refunding Bonds Series 1997 A Due 2020	13.5			13.5
Unsecured Term Loan Variable Rate Due 2020	110.0			10.0
Armenia Mountain Senior Secured Notes 3.26% Due 2024	47.8			57.2
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025	27.8			27.8
Senior Unsecured Notes 3.11% Due 2027	80.0			80.0
SWL&P First Mortgage Bonds 4.15% Series Due 2028	15.0			15.0
SWL&P First Mortgage Bonds 4.14% Series Due 2048	12.0			12.0
Other Long-Term Debt, 3.11% – 5.75% Due 2020 – 2037	46.5			67.7
Unamortized Debt Issuance Costs	(8.8		)	(9.2		)
Total Long-Term Debt	1,613.8			1,486.0
Less: Due Within One Year	212.9			57.5
Net Long-Term Debt		$1,400.9			$1,428.5

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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.

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