Short-Term and Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2019

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, 2019, and December 31, 2018:

June 30, 2019	Principal		Unamortized Debt Issuance Costs	Total
Millions
Short-Term Debt		$28.1	$(0.4)		$27.7
Long-Term Debt	1,514.9		(9.0)	1,505.9
Total Debt		$1,543.0	$(9.4)		$1,533.6

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

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%