Short-Term and Long-Term Debt (Tables)

9 Months Ended

Sep. 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 September 30, 2020, and December 31, 2019:

September 30, 2020	Principal	Unamortized Debt Issuance Costs	Total
Millions
Short-Term Debt	$404.8	$(0.3)	$404.5
Long-Term Debt	1,617.7	(9.7)	1,608.0
Total Debt	$2,022.5	$(10.0)	$2,012.5

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 August 3, 2020, ALLETE issued first mortgage bonds (Bonds) to certain institutional buyers in the private placement market as follows:

Maturity Date	Principal Amount	Interest Rate
August 1, 2030	$46 Million	2.50%
August 1, 2050	$94 Million	3.30%