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Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Investments [Abstract] |
Investments and ALLETE Properties [Table Text Block] |
Investments |  |  |
As of December 31 | 2012 |  | 2011
Millions |  |  |
ALLETE Properties |  | $91.1 |  |  |  | $91.3 |
Available-for-sale Securities | 26.8 |  |  | 24.7 |
Other | 25.6 |  |  | 16.3 |
Total Investments |  | $143.5 |  |  |  | $132.3 |
NOTE 7. INVESTMENTS (Continued)
ALLETE Properties |  |  |
As of December 31 | 2012 |  | 2011
Millions |  |  |
Land Inventory Beginning Balance |  | $86.0 |  |  |  | $86.0 |
Deeds to Collateralized Property | 0.5 |  |  | 1.8 |
Land Impairment | — |  |  | (1.7 | )
Cost of Sales | (0.2 | ) |  | (0.3 | )
Capitalized Improvements and Other | 0.2 |  |  | 0.2 |
Land Inventory Ending Balance | 86.5 |  |  | 86.0 |
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6) | 1.4 |  |  | 2.0 |
Other | 3.2 |  |  | 3.3 |
Total Real Estate Assets |  | $91.1 |  |  |  | $91.3 |
Available-for-sale Securities [Table Text Block] |
Available-For-Sale Securities
Millions |  | Gross Unrealized |
As of December 31 | Cost | Gain | (Loss) | Fair Value
2012 | $27.4 | $0.5 | $(1.1) | $26.8
2011 | $27.3 | $0.1 | $(2.7) | $24.7
2010 | $27.4 | $0.2 | $(2.4) | $25.2
Available-for-sale Securities [Table Text Block] |
| Net | Gross Realized | Net Unrealized Gain (Loss) in Other
Year Ended December 31 | Proceeds | Gain | (Loss) | Comprehensive Income
2012 | $1.5 | — | — | $1.2
2011 | $7.8 | — | — | $(0.3)
2010 | $0.6 | — | — | $0.8

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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