Schedule II

12 Months Ended

Dec. 31, 2018

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
2016 Trade Accounts Receivable		$1.0		$4.1	—		$2.0		$3.1
Finance Receivables – Long-Term		$0.6	—		—	$0.6		—
2017 Trade Accounts Receivable		$3.1		$0.8	—		$1.8		$2.1
Finance Receivables – Long-Term	—		—		—	—		—
2018 Trade Accounts Receivable		$2.1	$0.9		—		$1.3		$1.7
Finance Receivables – Long-Term	—		—		—	—		—
Deferred Asset Valuation Allowance
2016 Deferred Tax Assets		$31.6	$11.4		—	—			$43.0
2017 Deferred Tax Assets		$43.0	$17.0		—	—			$60.0
2018 Deferred Tax Assets		$60.0		$6.5	—	—			$66.5

(a) Includes uncollectible accounts written-off.