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Schedule II | 12 Months Ended
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Dec. 31, 2015
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 |  |  |  |  |
2013 Trade Accounts Receivable |  | $1.0 |  |  | $1.3 |  | — |  |  | $1.2 |  |  | $1.1 |
Finance Receivables – Long-Term |  | $0.6 |  | — |  | — |  | — |  |  | $0.6 |
2014 Trade Accounts Receivable |  | $1.1 |  |  | $1.8 |  | — |  |  | $1.8 |  |  | $1.1 |
Finance Receivables – Long-Term |  | $0.6 |  | — |  | — |  | — |  |  | $0.6 |
2015 Trade Accounts Receivable |  | $1.1 |  |  | $1.6 |  | — |  |  | $1.7 |  |  | $1.0 |
Finance Receivables – Long-Term |  | $0.6 |  | — |  | — |  | — |  |  | $0.6 |
Deferred Asset Valuation Allowance |  |  |  |  |
2013 Deferred Tax Assets |  | $2.4 |  | $5.6 | — |  | — |  |  | $8.0 |
2014 Deferred Tax Assets |  | $8.0 |  | $14.1 | — |  | — |  |  | $22.1 |
2015 Deferred Tax Assets |  | $22.1 |  |  | $9.5 |  | — |  | — |  |  | $31.6 |
(a) | Includes uncollectible accounts written off.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- References No definition available. + Details
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