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Schedule II | 12 Months Ended
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Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II | 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 |  |  |  |  |
2021 Trade Accounts Receivable | $2.5 |  | $1.2 | — |  | $1.9 |  | $1.8 |
2022 Trade Accounts Receivable | $1.8 |  | $1.9 | — |  | $2.1 |  | $1.6 |
2023 Trade Accounts Receivable | $1.6 |  | $1.3 |  | — |  | $1.3 |  | $1.6 |
Deferred Asset Valuation Allowance |  |  |  |  |
2021 Deferred Tax Assets | $69.9 |  | $(0.9) | — |  | — |  | $69.0 |
2022 Deferred Tax Assets | $69.0 |  | $(8.8) | — |  | — |  | $60.2 |
2023 Deferred Tax Assets | $60.2 |  | $(2.2) | — |  | — |  | $58.0 |
(a) Includes uncollectible accounts written-off.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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- References No definition available. + Details
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