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Investments (Tables) | 12 Months Ended
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Dec. 31, 2011
Investments [Abstract] |
Other Investments and ALLETE Properties [Table Text Block] |
Investments |  |  |
As of December 31 | 2011 |  | 2010
Millions |  |  |
ALLETE Properties |  | $91.3 |  |  |  | $94.0 |
Available-for-sale Securities | 24.7 |  |  | 25.2 |
Other | 16.3 |  |  | 6.8 |
Total Investments |  | $132.3 |  |  |  | $126.0 |
Note 7. | Investments (Continued)
ALLETE Properties |  |  |
As of December 31 | 2011 |  | 2010
Millions |  |  |
Land Inventory Beginning Balance |  | $86.0 |  |  |  | $74.9 |
Deeds to Collateralized Property (a) | 1.8 |  |  | 9.9 |
Land Impairment (b) | (1.7 | ) |  | — |
Cost of Real Estate Sold | (0.3 | ) |  | — |
Capitalized Improvements and Other | 0.2 |  |  | 1.2 |
Land Inventory Ending Balance | 86.0 |  |  | 86.0 |
Long-Term Finance Receivables (net of allowances of $0.6 and $0.8) (a) | 2.0 |  |  | 3.7 |
Other | 3.3 |  |  | 4.3 |
Total Real Estate Assets |  | $91.3 |  |  |  | $94.0 |
(a) | In 2010, the deeds to collateralized property resulted primarily from an entity which filed for Chapter 11 bankruptcy and were recorded at fair value net of estimated selling costs.
(b) | The land impairment charge was a result of an impairment analysis conducted in the fourth quarter of 2011 where the cost basis was reduced to the estimated fair value.
Available-for-sale Securities Reconciliation [Table Text Block] |
Available-For-Sale Securities
Millions |  | Gross Unrealized |
As of December 31 | Cost |  | Gain |  | (Loss) | Fair Value |
2011 |  | $27.3 |  |  | $0.1 |  | $(2.7) |  | $24.7 |
2010 |  | $27.4 |  |  | $0.2 |  | $(2.4) |  | $25.2 |
2009 |  | $33.1 |  |  | $0.1 |  | $(3.7) |  | $29.5 |
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
2011 |  | $5.5 |  | — |  | — |  | $(0.4)
2010 | $(1.7) | — |  | — |  |  | $1.4 |
2009 |  | $6.7 |  | — |  | — |  |  | $4.5 |

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