Schedule II

12 Months Ended

Dec. 31, 2020

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II [Text Block]

Schedule II

ALLETE

Valuation and Qualifying Accounts and Reserves

	Balance at Beginning of Period	Additions		Deductions from Reserves (a)	Balance at End of Period
		Charged to Income	Other Charges
Millions
Reserve Deducted from Related Assets
Reserve For Uncollectible Accounts
2018 Trade Accounts Receivable	$2.1	$0.9	—	$1.3	$1.7
Finance Receivables – Long-Term	—	—	—	—	—
2019 Trade Accounts Receivable	$1.7	$(0.1)	—	$0.7	$0.9
Finance Receivables – Long-Term	—	—	—	—	—
2020 Trade Accounts Receivable	$0.9	$2.7	—	$1.1	$2.5
Finance Receivables – Long-Term	—	—	—	—	—
Deferred Asset Valuation Allowance
2018 Deferred Tax Assets	$60.0	$6.5	—	—	$66.5
2019 Deferred Tax Assets	$66.5	$3.5	—	—	$70.0
2020 Deferred Tax Assets	$70.0	$(0.1)	—	—	$69.9

(a)    Includes uncollectible accounts written-off.