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Investments (Tables) | 12 Months Ended
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Dec. 31, 2013
Investments [Abstract] |
Other Investments and ALLETE Properties [Table Text Block] |
Other Investments |  |
As of December 31 | 2013 |  | 2012 |
Millions |  |
ALLETE Properties |  | $89.9 |  |  | $91.1 |
Available-for-sale Securities (a) | 17.7 |  | 26.8 |
Cash Equivalents | 34.2 |  | 20.7 |
Other | 4.5 |  | 4.9 |
Total Other Investments |  | $146.3 |  |  | $143.5 |
(a) | As of December 31, 2013, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.6 million, in one year to less than three years was $4.7 million, in three years to less than five years was $2.0 million, and in five or more years was $2.5 million.
ALLETE Properties | December 31, 2013 |  | December 31, 2012 |
Millions |  |
Land Inventory Beginning Balance |  | $86.5 |  |  | $86.0 |
Cost of Sales | (1.5 | ) | (0.2 | )
Other | 0.4 |  | 0.7 |
Land Inventory Ending Balance | 85.4 |  | 86.5 |
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6) | 1.4 |  | 1.4 |
Other | 3.1 |  | 3.2 |
Total Real Estate Assets |  | $89.9 |  |  | $91.1 |
Available-for-sale Securities [Table Text Block] |
Available-For-Sale Securities
Millions |  | Gross Unrealized |
As of December 31 | Cost | Gain | (Loss) | Fair Value
2013 | $18.3 | — | $(0.6) | $17.7
2012 | $27.4 | $0.5 | $(1.1) | $26.8
2011 | $27.3 | $0.1 | $(2.7) | $24.7
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
2013 | $16.1 | $2.2 | — | —
2012 | $1.5 | — | — | $1.2
2011 | $7.8 | — | — | $(0.3)

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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=27724398&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 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: 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=27724398&loc=d3e27337-111563 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: 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 7: 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=27724398&loc=d3e27161-111563 + Details
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