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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Pension [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | $ 460.1 |  | $ 432.4 |  | $ 382.0
Pension [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 213.0 |  | 152.8 |  |
Pension [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 163.3 |  | 188.9 |  |
Pension [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 83.8 |  | 90.7 |  |
Pension [Member] | U.S. Large-Cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 79.0 | [1] | 69.4 | [1] |
Pension [Member] | U.S. Large-Cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 43.0 | [1] | 32.1 | [1] |
Pension [Member] | U.S. Large-Cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 36.0 | [1] | 37.3 | [1] |
Pension [Member] | U.S. Large-Cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Pension [Member] | U.S. Mid-Cap Growth [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 33.6 | [1] | 29.3 | [1] |
Pension [Member] | U.S. Mid-Cap Growth [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 18.3 | [1] | 13.5 | [1] |
Pension [Member] | U.S. Mid-Cap Growth [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 15.3 | [1] | 15.8 | [1] |
Pension [Member] | U.S. Mid-Cap Growth [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Pension [Member] | U.S. Small Cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 33.6 | [1] | 28.3 | [1] |
Pension [Member] | U.S. Small Cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 18.3 | [1] | 13.1 | [1] |
Pension [Member] | U.S. Small Cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 15.3 | [1] | 15.2 | [1] |
Pension [Member] | U.S. Small Cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Pension [Member] | International [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 96.4 |  | 75.1 |  |
Pension [Member] | International [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 50.5 |  | 0 |  |
Pension [Member] | International [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 45.9 |  | 75.1 |  |
Pension [Member] | International [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Pension [Member] | ALLETE [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets |  |  | 21.3 |  |
Pension [Member] | ALLETE [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets |  |  | 21.3 |  |
Pension [Member] | ALLETE [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets |  |  | 0 |  |
Pension [Member] | ALLETE [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets |  |  | 0 |  |
Pension [Member] | Mutual Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 72.5 |  | 72.8 |  |
Pension [Member] | Mutual Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 72.5 |  | 72.8 |  |
Pension [Member] | Mutual Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Pension [Member] | Mutual Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Pension [Member] | Fixed Income [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 61.2 |  | 45.5 |  |
Pension [Member] | Fixed Income [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 10.4 |  | 0 |  |
Pension [Member] | Fixed Income [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 50.8 |  | 45.5 |  |
Pension [Member] | Fixed Income [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Pension [Member] | Private Equity Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 58.9 |  | 69.0 |  |
Pension [Member] | Private Equity Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Pension [Member] | Private Equity Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Pension [Member] | Private Equity Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 58.9 |  | 69.0 |  |
Pension [Member] | Real Estate [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 24.9 |  | 21.7 |  |
Pension [Member] | Real Estate [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Pension [Member] | Real Estate [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Pension [Member] | Real Estate [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 24.9 |  | 21.7 |  |
Postretirement Health and Life [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 131.0 |  | 121.0 |  | 114.7
Postretirement Health and Life [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 99.2 |  | 88.1 |  |
Postretirement Health and Life [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 18.3 |  | 18.9 |  |
Postretirement Health and Life [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 13.5 |  | 14.0 |  |
Postretirement Health and Life [Member] | U.S. Large-Cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 16.7 |  | 15.9 |  |
Postretirement Health and Life [Member] | U.S. Large-Cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 16.7 | [2] | 15.9 | [2] |
Postretirement Health and Life [Member] | U.S. Large-Cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | U.S. Large-Cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | U.S. Mid-Cap Growth [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 13.2 |  | 11.5 |  |
Postretirement Health and Life [Member] | U.S. Mid-Cap Growth [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 13.2 | [2] | 11.5 | [2] |
Postretirement Health and Life [Member] | U.S. Mid-Cap Growth [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | U.S. Mid-Cap Growth [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | U.S. Small Cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 13.3 |  | 11.2 |  |
Postretirement Health and Life [Member] | U.S. Small Cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 13.3 | [2] | 11.2 | [2] |
Postretirement Health and Life [Member] | U.S. Small Cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | U.S. Small Cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | International [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 30.3 |  | 25.1 |  |
Postretirement Health and Life [Member] | International [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 30.3 |  | 25.1 |  |
Postretirement Health and Life [Member] | International [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | International [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Mutual Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 25.5 |  | 24.1 |  |
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 25.5 |  | 24.1 |  |
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Fixed Income [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 18.5 |  | 19.2 |  |
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0.2 |  | 0.3 |  |
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 18.3 |  | 18.9 |  |
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 13.5 |  | 14.0 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Plan Assets | $ 13.5 |  | $ 14.0 |  |
[1] | The underlying investments classified under U.S. Equity Securities consist of money market funds (Level 1) and actively-managed funds (Level 2), which are combined with futures, and settle daily, in a portable alpha program to achieve the returns of the U.S. Equity Securities Large-cap, Mid-cap Growth, and Small-cap funds. Our exposure with respect to these investments includes both the futures and the underlying investments.
[2] | The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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