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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

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).

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration