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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]  
Estimated Future Benefit Payments [Table Text Block]
Estimated Future Benefit Payments
 
 
Postretirement
 
Pension
Health and Life
Millions
 
 
2013

$31.2


$7.6

2014

$32.1


$8.2

2015

$33.2


$8.9

2016

$34.4


$9.4

2017

$35.5


$9.7

Years 2018 – 2022

$189.4


$52.0
Defined Benefit Costs Recorded in Regulatory Long-Term Assets and Accumulated Other Comprehensive Income Expected to be Recognized over Next Fiscal Year [Table Text Block]
The pension and postretirement health and life costs recorded in regulatory long-term assets and accumulated other comprehensive income expected to be recognized as a component of net pension and postretirement benefit costs for the year ending December 31, 2013, are as follows:

 
Pension
Postretirement
Health and Life
Millions
 
 
Net Loss

$21.4


$1.6

Prior Service Cost (Credit)
0.3

(2.5
)
Total Pension and Postretirement Health and Life Cost (Credit)

$21.7

$(0.9)
Weighted-Average Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs [Table Text Block]
Weighted-Average Assumptions Used to Determine Benefit Obligation
As of December 31
2012
2011
Discount Rate
 
 
Pension
4.10%
4.54%
Postretirement Health and Life
4.13%
4.56%
Rate of Compensation Increase
4.3 - 4.6%
4.3 - 4.6%
Health Care Trend Rates
 
 
Trend Rate
9.25%
10%
Ultimate Trend Rate
5%
5%
Year Ultimate Trend Rate Effective
2019
2018

Weighted-Average Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31
2012
2011
2010
Discount Rate
4.54 - 4.56%
5.36 - 5.40%
5.81%
Expected Long-Term Return on Plan Assets
 
 
 
Pension
8.25%
8.5%
8.5%
Postretirement Health and Life
6.6 - 8.25%
6.8 - 8.5%
6.8 - 8.5%
Rate of Compensation Increase
4.3 - 4.6%
4.3 - 4.6%
4.3 - 4.6%
Plan Asset Allocations, Actual and Target [Table Text Block]
Actual Plan Asset Allocations
 
Pension
Postretirement
Health and Life (a)
 
2012
2011
2012
2011
Equity Securities
54
%
52
%
56
%
51
%
Debt Securities
28
%
27
%
35
%
39
%
Private Equity
13
%
16
%
9
%
10
%
Real Estate
5
%
5
%
—

—

 
100
%
100
%
100
%
100
%
(a)
Includes VEBAs and irrevocable grantor trusts.

Plan Asset Target Allocations
 
 
Postretirement
 
Pension
Health and Life (a)
Equity Securities
52
%
48
%
Debt Securities
30
%
34
%
Real Estate
9
%
9
%
Private Equity
9
%
9
%
 
100
%
100
%
(a)
Includes VEBAs and irrevocable grantor trusts.
Recurring Fair Value Measures [Table Text Block]
 
Fair Value as of December 31, 2012
Recurring Fair Value Measures
Level 1
 
Level 2
 
Level 3
 
Total
Millions
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Investments
 
 
 
 
 
 
 
Available-for-sale Securities – Equity Securities

$18.0

 
—

 
—

 

$18.0

Available-for-sale Securities – Corporate Debt Securities
—

 

$8.8

 
—

 
8.8

Cash Equivalents
20.7

 
—

 
—

 
20.7

Total Fair Value of Assets

$38.7

 

$8.8

 
—

 

$47.5

 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
Deferred Compensation
—

 

$14.0

 
—

 

$14.0

Derivatives – Interest Rate Swap
—

 
0.7

 
—

 
0.7

Total Fair Value of Liabilities
—

 

$14.7

 
—

 

$14.7

Total Net Fair Value of Assets (Liabilities)

$38.7

 
$(5.9)
 
—

 

$32.8

 
Fair Value as of December 31, 2011
Recurring Fair Value Measures
Level 1
 
Level 2
 
Level 3
 
Total
Millions
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Investments
 
 
 
 
 
 
 
Available-for-sale Securities – Equity Securities

$17.6

 
—

 
—

 

$17.6

Available-for-sale Securities – Corporate Debt Securities
—

 

$8.2

 
—

 
8.2

Cash Equivalents
11.4

 
—

 
—

 
11.4

Total Fair Value of Assets

$29.0

 

$8.2

 
—

 

$37.2

 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
Deferred Compensation
—

 

$12.8

 
—

 

$12.8

Derivatives – Interest Rate Swap
—

 

$0.4

 
—

 

$0.4

Total Fair Value of Liabilities
—

 

$13.2

 
—

 

$13.2

Total Net Fair Value of Assets (Liabilities)

$29.0

 
$(5.0)
 
—

 

$24.0
Recurring Fair Value Measures - Activity in Level 3 [Table Text Block]
Recurring Fair Value Measures
Activity in Level 3
Debt Securities
Issued by States
of the United
States (ARS)
Millions
 
Balance as of December 31, 2010

$6.7

Redeemed During the Period (a)
(6.7
)
Balance as of December 31, 2011

$—


(a)
The ARS were redeemed at carrying value on January 5, 2011.
Pension [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Obligation and Funded Status [Table Text Block]
Pension Obligation and Funded Status
Year Ended December 31
2012
2011
Millions
 
 
Accumulated Benefit Obligation

$598.7


$550.6

Change in Benefit Obligation
 

 

Obligation, Beginning of Year

$597.5


$525.6

Service Cost
9.1

7.6

Interest Cost
26.4

27.4

Actuarial Loss
38.5

54.6

Benefits Paid
(30.9
)
(28.6
)
Participant Contributions
11.5

10.9

Obligation, End of Year

$652.1


$597.5

Change in Plan Assets
 

 

Fair Value, Beginning of Year

$432.4


$382.0

Actual Return on Plan Assets
38.7

33.2

Employer Contribution
19.9

45.8

Benefits Paid
(30.9
)
(28.6
)
Fair Value, End of Year

$460.1


$432.4

Funded Status, End of Year
$(192.0)
$(165.1)
 
 
 
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of:
 

 

Current Liabilities
$(1.1)
$(1.1)
Non-Current Liabilities
$(190.9)
$(164.0)
Unrecognized Benefit Costs [Table Text Block]
The pension costs that are reported as a component within our Consolidated Balance Sheet, reflected in long-term regulatory assets and accumulated other comprehensive income, consist of the following:

Unrecognized Pension Costs
Year Ended December 31
2012
2011
Millions
 
 
Net Loss

$286.8


$269.0

Prior Service Cost
0.7

1.1

Total Unrecognized Pension Costs

$287.5


$270.1
Components of Net Periodic Expense [Table Text Block]
Components of Net Periodic Pension Expense
Year Ended December 31
2012
2011
2010
Millions
 
 
 
Service Cost

$9.1


$7.6


$6.2

Interest Cost
26.4

27.4

26.2

Expected Return on Plan Assets
(35.4
)
(34.6
)
(33.7
)
Amortization of Loss
17.5

12.1

6.6

Amortization of Prior Service Cost
0.3

0.3

0.5

Net Pension Expense

$17.9


$12.8


$5.8
Other Changes in Defined Benefit Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets [Table Text Block]
Other Changes in Pension Plan Assets and Benefit Obligations Recognized in
Other Comprehensive Income and Regulatory Assets
Year Ended December 31
2012
2011
Millions
 
 
Net Loss

$35.2


$56.1

Amortization of Prior Service Cost
(0.3
)
(0.3
)
Amortization of Loss
(17.5
)
(12.2
)
Total Recognized in Other Comprehensive Income and Regulatory Assets

$17.4


$43.6
Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]
Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets
Year Ended December 31
2012
2011
Millions
 
 
Projected Benefit Obligation

$652.1


$597.5

Accumulated Benefit Obligation

$598.7


$550.6

Fair Value of Plan Assets

$460.1


$432.4
Recurring Fair Value Measures [Table Text Block]
 
Fair Value as of December 31, 2012
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$43.0


$36.0

—


$79.0

U.S. Mid-cap Growth (a)
18.3

15.3

—

33.6

U.S. Small-cap (a)
18.3

15.3

—

33.6

International
50.5

45.9

—

96.4

Debt Securities:
 

 

 

 

Mutual Funds
72.5

—

—

72.5

Fixed Income
10.4

50.8

—

61.2

Other Types of Investments:
 

 

 

 

Private Equity Funds
—

—


$58.9

58.9

Real Estate
—

—

24.9

24.9

Total Fair Value of Assets

$213.0


$163.3


$83.8


$460.1

(a)
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. 
 
Fair Value as of December 31, 2011
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$32.1


$37.3

—


$69.4

U.S. Mid-cap Growth (a)
13.5

15.8

—

29.3

U.S. Small-cap (a)
13.1

15.2

—

28.3

International
—

75.1

—

75.1

ALLETE
21.3

—

—

21.3

Debt Securities:
 

 

 

 

Mutual Funds
72.8

—

—

72.8

Fixed Income
—

45.5

—

45.5

Other Types of Investments:
 

 

 

 

Private Equity Funds
—

—


$69.0

69.0

Real Estate
—

—

21.7

21.7

Total Fair Value of Assets

$152.8


$188.9


$90.7


$432.4

(a)
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. 
Recurring Fair Value Measures - Activity in Level 3 [Table Text Block]
 Recurring Fair Value Measures
 
 
Activity in Level 3
Private Equity Funds
Real Estate
Millions
 
 
Balance as of December 31, 2011

$69.0


$21.7

Actual Return on Plan Assets
(9.7
)
3.4

Purchases, sales, and settlements, net
(0.4
)
(0.2
)
Balance as of December 31, 2012

$58.9


$24.9

Recurring Fair Value Measures
 
 
 
Activity in Level 3
Equity Securities (ARS)
Private Equity Funds
Real Estate
Millions
 
 
 
Balance as of December 31, 2010

$6.7


$50.7


$20.1

Actual Return on Plan Assets
—

30.9

3.5

Purchases, sales, and settlements, net
(6.7
)
(12.6
)
(1.9
)
Balance as of December 31, 2011
—


$69.0


$21.7
Postretirement Health and Life [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Obligation and Funded Status [Table Text Block]
Postretirement Health and Life Obligation and Funded Status
Year Ended December 31
2012
2011
Millions
 
 
Change in Benefit Obligation
 
 
Obligation, Beginning of Year

$210.6


$204.1

Service Cost
4.2

3.8

Interest Cost
9.4

10.8

Actuarial Gain
(43.2
)
(2.9
)
Participant Contributions
2.6

2.5

Plan Amendments
(5.3
)
—

Benefits Paid
(9.5
)
(7.7
)
Obligation, End of Year

$168.8


$210.6

Change in Plan Assets
 
 
Fair Value, Beginning of Year

$121.0


$114.7

Actual Return on Plan Assets
14.3

—

Employer Contribution
2.3

11.4

Participant Contributions
2.5

2.5

Benefits Paid
(9.1
)
(7.6
)
Fair Value, End of Year

$131.0


$121.0

Funded Status, End of Year
$(37.8)
$(89.6)
 
 
 
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of:
 
 
Current Liabilities
$(0.8)
$(0.9)
Non-Current Liabilities
$(37.0)
$(88.7)
Unrecognized Benefit Costs [Table Text Block]
The postretirement health and life costs that are reported as a component within our Consolidated Balance Sheet, reflected in regulatory long-term assets and accumulated other comprehensive income, consist of the following:

Unrecognized Postretirement Health and Life Costs
Year Ended December 31
2012
2011
Millions
 
 
Net Loss

$23.5


$78.5

Prior Service Credit
(13.1
)
(9.5
)
Transition Obligation
—

0.1

Total Unrecognized Postretirement Health and Life Costs

$10.4


$69.1
Components of Net Periodic Expense [Table Text Block]
Components of Net Periodic Postretirement Health and Life Expense
Year Ended December 31
2012
2011
2010
Millions
 
 
 
Service Cost

$4.2


$3.8


$4.8

Interest Cost
9.4

10.8

10.9

Expected Return on Plan Assets
(9.9
)
(9.7
)
(9.5
)
Amortization of Prior Service Credit
(1.7
)
(1.7
)
(0.1
)
Amortization of Loss
7.5

8.5

4.8

Amortization of Transition Obligation
0.1

0.1

2.5

Net Postretirement Health and Life Expense

$9.6


$11.8


$13.4
Other Changes in Defined Benefit Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets [Table Text Block]
Other Changes in Postretirement Benefit Plan Assets and Benefit Obligations
Recognized in Other Comprehensive Income and Regulatory Assets
Year Ended December 31
2012
2011
Millions
 
 
Net (Gain) Loss
$(47.5)

$6.9

Prior Service Credit Arising During the Period
(5.3
)
—

Amortization of Prior Service Credit
1.7

1.7

Amortization of Transition Obligation
(0.1
)
(0.1
)
Amortization of Loss
(7.5
)
(8.5
)
Total Recognized in Other Comprehensive Income and Regulatory Assets
$(58.7)
—
Sensitivity of a One-Percentage-Point Change in Health Care Trend Rates [Table Text Block]
Sensitivity of a One-Percentage-Point Change in Health Care Trend Rates
 
One Percent
One Percent
 
Increase
Decrease
Millions
 
 
Effect on Total of Postretirement Health and Life Service and Interest Cost

$2.0

$(1.6)
Effect on Postretirement Health and Life Obligation

$18.2

$(15.1)
Recurring Fair Value Measures [Table Text Block]
 
Fair Value as of December 31, 2012
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$16.7

—

—


$16.7

U.S. Mid-cap Growth (a)
13.2

—

—

13.2

U.S. Small-cap (a)
13.3

—

—

13.3

International
30.3

—

—

30.3

Debt Securities:
 

 

 

 

Mutual Funds
25.5

—

—

25.5

Fixed Income
0.2


$18.3

—

18.5

Other Types of Investments:
 

 

 

 

Private Equity Funds
—

—


$13.5

13.5

Total Fair Value of Assets

$99.2


$18.3


$13.5


$131.0


(a)
The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).
 
Fair Value as of December 31, 2011
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$15.9

—

—


$15.9

U.S. Mid-cap Growth (a)
11.5

—

—

11.5

U.S. Small-cap (a)
11.2

—

—

11.2

International
25.1

—

—

25.1

Debt Securities:
 

 

 

 

Mutual Funds
24.1

—

—

24.1

Fixed Income
0.3


$18.9

—

19.2

Other Types of Investments:
 

 

 

 

Private Equity Funds
—

—


$14.0

14.0

Total Fair Value of Assets

$88.1


$18.9


$14.0


$121.0


(a)
The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1). 
Recurring Fair Value Measures - Activity in Level 3 [Table Text Block]
Recurring Fair Value Measures
 
Activity in Level 3
Private Equity Funds
Millions
 
Balance as of December 31, 2011

$14.0

Actual Return on Plan Assets
0.2

Purchases, sales, and settlements, net
(0.7
)
Balance as of December 31, 2012

$13.5

Recurring Fair Value Measures
 
Activity in Level 3
Private Equity Funds
Millions
 
Balance as of December 31, 2010

$12.4

Actual Return on Plan Assets
1.1

Purchases, sales, and settlements, net
0.5

Balance as of December 31, 2011

$14.0