Short-Term and Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Schedule of Short-Term and Long-Term Debt [Table Text Block]

The following tables present ALLETE’s short-term and long-term debt as of June 30, 2017, and December 31, 2016:

June 30, 2017	Principal		Unamortized Debt Issuance Costs	Total
Millions
Short-Term Debt		$118.2	$(0.5)		$117.7
Long-Term Debt	1,411.4		(10.0)	1,401.4
Total Debt		$1,529.6	$(10.5)		$1,519.1

December 31, 2016	Principal		Unamortized Debt Issuance Costs	Total
Millions
Short-Term Debt		$188.3	$(0.6)		$187.7
Long-Term Debt	1,380.8		(10.4)	1,370.4
Total Debt		$1,569.1	$(11.0)		$1,558.1