Short-Term and Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2020, and December 31, 2019:

March 31, 2020	Principal		Unamortized Debt Issuance Costs	Total
Millions
Short-Term Debt		$323.3	$(0.3)		$323.0
Long-Term Debt	1,408.0		(8.1)	1,399.9
Total Debt		$1,731.3	$(8.4)		$1,722.9

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 will be issued on or before 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%