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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]  
Estimated Future Benefit Payments [Table Text Block]
Estimated Future Benefit Payments
    Pension
Postretirement Health and Life
Millions
 

 
2015

$36.5


$8.0

2016

$37.1


$8.5

2017

$38.2


$8.8

2018

$39.0


$9.0

2019

$39.9


$9.4

Years 2020 – 2024

$207.8


$49.4
Defined Benefit Costs Recorded in Regulatory Long-Term Assets or Liabilities 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 or liabilities 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, 2015, are as follows:
 
      Pension
Postretirement
Health and Life
Millions
 
 
Net Loss

$17.9


$0.4

Prior Service Cost (Credit)
0.2

(3.0
)
Total Pension and Postretirement Health and Life Cost (Credit)

$18.1

$(2.6)
Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs [Table Text Block]
Assumptions Used to Determine Benefit Obligation
As of December 31
2014
2013
Discount Rate
 
 
Pension
4.30%
4.93%
Postretirement Health and Life
4.33%
4.96%
Rate of Compensation Increase
3.70 - 4.30%
3.70 - 4.30%
Health Care Trend Rates
 
 
Trend Rate
6.75%
7.25%
Ultimate Trend Rate
5.00%
5.00%
Year Ultimate Trend Rate Effective
2022
2020

Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31
2014
2013
2012
Discount Rate
4.93 - 4.96%
4.10 - 4.13%
4.54 - 4.56%
Expected Long-Term Return on Plan Assets
 
 
 
Pension
8.00%
8.25%
8.25%
Postretirement Health and Life
6.40 - 8.00%
6.60 - 8.25%
6.60 - 8.25%
Rate of Compensation Increase
3.70 - 4.30%
4.30 - 4.60%
4.30 - 4.60%
Plan Asset Allocations, Actual and Target [Table Text Block]
Actual Plan Asset Allocations
Pension
Postretirement
Health and Life (a)
 
2014
2013
2014
2013
Equity Securities
48
%
52
%
58
%
63
%
Debt Securities
39
%
34
%
34
%
29
%
Private Equity
8
%
9
%
8
%
8
%
Real Estate
5
%
5
%
—

—

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

Plan Asset Target Allocations
    Pension
Postretirement
Health and Life (a)
Equity Securities
56
%
60
%
Debt Securities
35
%
37
%
Real Estate
9
%
3
%
 
100
%
100
%
(a)
Includes VEBAs and irrevocable grantor trusts.
Pension [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Obligation and Funded Status [Table Text Block]
Pension Obligation and Funded Status
At December 31
2014

2013

Millions
 
 
Accumulated Benefit Obligation

$661.4


$577.6

Change in Benefit Obligation
 

 

Obligation, Beginning of Year

$622.8


$652.1

Service Cost
8.3

9.9

Interest Cost
29.8

26.0

Actuarial (Gain) Loss
72.6

(49.2
)
Benefits Paid
(36.9
)
(33.5
)
Participant Contributions
17.9

17.5

Obligation, End of Year

$714.5


$622.8

Change in Plan Assets
 

 

Fair Value, Beginning of Year

$501.6


$460.1

Actual Return on Plan Assets
41.0

56.5

Employer Contribution (a)
38.5

18.5

Benefits Paid
(36.9
)
(33.5
)
Fair Value, End of Year

$544.2


$501.6

Funded Status, End of Year
$(170.3)
$(121.2)
 
 
 
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of:
 

 

Current Liabilities
$(1.2)
$(1.1)
Non-Current Liabilities
$(169.1)
$(120.1)

(a)
Includes participant contributions noted above.
Unrecognized Costs [Table Text Block]
The pension costs that are reported as a component within our Consolidated Balance Sheet, reflected in long-term regulatory assets or liabilities and accumulated other comprehensive income, consist of the following:

Unrecognized Pension Costs
As of December 31
2014

2013

Millions
 
 
Net Loss

$250.4


$194.9

Prior Service Cost
0.2

0.4

Total Unrecognized Pension Costs

$250.6


$195.3
Components of Net Periodic Expense [Table Text Block]
Components of Net Periodic Pension Expense
Year Ended December 31
2014

2013

2012

Millions
 
 
 
Service Cost

$8.3


$9.9


$9.1

Interest Cost
29.8

26.0

26.4

Expected Return on Plan Assets
(38.2
)
(35.2
)
(35.4
)
Amortization of Loss
14.2

21.5

17.5

Amortization of Prior Service Cost
0.3

0.3

0.3

Net Pension Expense

$14.4


$22.5


$17.9
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities [Table Text Block]
Other Changes in Pension Plan Assets and Benefit Obligations Recognized in
Other Comprehensive Income and Regulatory Assets or Liabilities
Year Ended December 31
2014

2013

Millions
 
 
Net (Gain) Loss
$69.8
$(70.4)
Amortization of Prior Service Cost
(0.3
)
(0.3
)
Amortization of Loss
(14.2
)
(21.5
)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
$55.3
$(92.2)
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
As of December 31
2014

2013

Millions
 
 
Projected Benefit Obligation

$714.5


$622.8

Accumulated Benefit Obligation

$661.4


$577.6

Fair Value of Plan Assets

$544.2


$501.6
Recurring Fair Value Measures [Table Text Block]
 
Fair Value as of December 31, 2014
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$32.1


$56.4

—


$88.5

U.S. Mid-cap Growth (a)
13.6

23.9

—

37.5

U.S. Small-cap (a)
13.9

24.4

—

38.3

International
46.1

45.9

—

92.0

Debt Securities:
 

 

 

 

Mutual Funds
0.1

—

—

0.1

Fixed Income
2.7

201.0

—

203.7

Cash Equivalents
11.9

—

—

11.9

Other Types of Investments:
 

 

 

 

Private Equity Funds
—

—


$43.3

43.3

Real Estate
—

—

28.9

28.9

Total Fair Value of Assets

$120.4


$351.6


$72.2


$544.2

(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, 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, 2013
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$20.9


$59.3

—


$80.2

U.S. Mid-cap Growth (a)
9.4

26.7

—

36.1

U.S. Small-cap (a)
9.9

28.2

—

38.1

International
61.2

43.5

—

104.7

Debt Securities:
 

 

 

 

Mutual Funds
130.1

—

—

130.1

Fixed Income
—

36.4

—

36.4

Cash Equivalents
2.7

—

—

2.7

Other Types of Investments:
 

 

 

 

Private Equity Funds
—

—


$46.8

46.8

Real Estate
—

—

26.5

26.5

Total Fair Value of Assets

$234.2


$194.1


$73.3


$501.6

(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, 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, 2012
 

$58.9


$24.9

Actual Return on Plan Assets
 
2.3

2.1

Purchases, sales, and settlements, net
 
(14.4
)
(0.5
)
Balance as of December 31, 2013
 

$46.8


$26.5

Recurring Fair Value Measures
 
 
Activity in Level 3
Private Equity Funds
    Real Estate
Millions
 
 
Balance as of December 31, 2013

$46.8


$26.5

Actual Return on Plan Assets
1.2

2.8

Purchases, sales, and settlements, net
(4.7
)
(0.4
)
Balance as of December 31, 2014

$43.3


$28.9
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
At December 31
2014

2013

Millions
 
 
Change in Benefit Obligation
 
 
Obligation, Beginning of Year

$151.9


$168.8

Service Cost
3.4

3.9

Interest Cost
7.3

6.8

Actuarial (Gain) Loss
18.1

(18.8
)
Benefits Paid
(8.9
)
(9.9
)
Participant Contributions
2.6

2.7

Plan Amendments
(2.9
)
—

Plan Curtailments
(0.6
)
—

Settlements (a)
—

(1.6
)
Obligation, End of Year

$170.9


$151.9

Change in Plan Assets
 
 
Fair Value, Beginning of Year

$157.0


$131.0

Actual Return on Plan Assets
11.6

21.4

Employer Contribution
1.1

11.7

Participant Contributions
2.6

2.7

Benefits Paid
(9.1
)
(9.8
)
Fair Value, End of Year

$163.2


$157.0

Funded Status, End of Year
$(7.7)
$5.1
 
 
 
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of:
 
 
Non-Current Assets
$6.6
$19.4
Current Liabilities
$(0.9)
$(0.9)
Non-Current Liabilities
$(13.4)
$(13.4)

(a)
Result of the termination of a legacy benefit plan.
Unrecognized 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 or liabilities and accumulated other comprehensive income, consist of the following:

Unrecognized Postretirement Health and Life Costs
As of December 31
2014

2013

Millions
 
 
Net (Gain) Loss
$6.9
$(9.0)
Prior Service Credit
(10.6
)
(10.1
)
Total Unrecognized Postretirement Health and Life Credit
$(3.7)
$(19.1)
Components of Net Periodic Expense [Table Text Block]
Components of Net Periodic Postretirement Health and Life Expense
Year Ended December 31
2014

2013

2012

Millions
 
 
 
Service Cost

$3.4


$3.9


$4.2

Interest Cost
7.3

6.8

9.4

Expected Return on Plan Assets
(10.3
)
(9.7
)
(9.9
)
Amortization of Loss
0.5

1.6

7.5

Amortization of Prior Service Credit
(2.5
)
(2.5
)
(1.7
)
Amortization of Transition Obligation
—

—

0.1

Effect of Plan Settlement (a)
—

(1.6
)
—

Net Postretirement Health and Life Expense (Credit)
$(1.6)
$(1.5)

$9.6


(a)
Result of the termination of a legacy benefit plan.
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities [Table Text Block]
Other Changes in Postretirement Benefit Plan Assets and Benefit Obligations
Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
Year Ended December 31
2014

2013

Millions
 
 
Net (Gain) Loss
$16.4
$(30.2)
Prior Service Credit Arising During the Period
(3.0
)
—

Amortization of Prior Service Credit
2.5

2.5

Amortization of Loss
(0.5
)
(1.6
)
Amount Recognized due to Plan Settlement (a)
—

(0.2
)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
$15.4
$(29.5)

(a)
Result of the termination of a legacy benefit plan.
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
Increase
One Percent
Decrease
Millions
 
 
Effect on Total of Postretirement Health and Life Service and Interest Cost

$1.5

$(1.2)
Effect on Postretirement Health and Life Obligation

$21.6

$(17.7)
Recurring Fair Value Measures [Table Text Block]
 
Fair Value as of December 31, 2013
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$28.3

—

—


$28.3

U.S. Mid-cap Growth (a)
17.6

—

—

17.6

U.S. Small-cap (a)
18.2

—

—

18.2

International
33.4

—

—

33.4

Debt Securities:
 

 

 

 

Mutual Funds
30.8

—

—

30.8

Fixed Income
—


$15.5

—

15.5

Cash Equivalents
0.1

—

—

0.1

Other Types of Investments:
 

 

 

 

Private Equity Funds
—

—


$13.1

13.1

Total Fair Value of Assets

$128.4


$15.5


$13.1


$157.0


(a)
The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1). 
 
Fair Value as of December 31, 2014
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$29.3

—

—


$29.3

U.S. Mid-cap Growth (a)
20.0

—

—

20.0

U.S. Small-cap (a)
12.6

—

—

12.6

International
30.6

—

—

30.6

Debt Securities:
 

 

 

 

Mutual Funds
44.5

—

—

44.5

Fixed Income
—


$9.9

—

9.9

Cash Equivalents
3.4

—

—

3.4

Other Types of Investments:
 

 

 

 

Private Equity Funds
—

—


$12.9

12.9

Total Fair Value of Assets

$140.4


$9.9


$12.9


$163.2


(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, 2013

$13.1

Actual Return on Plan Assets
1.4

Purchases, sales, and settlements, net
(1.6
)
Balance as of December 31, 2014

$12.9

Recurring Fair Value Measures
 
Activity in Level 3
Private Equity Funds
Millions
 
Balance as of December 31, 2012

$13.5

Actual Return on Plan Assets
2.4

Purchases, sales, and settlements, net
(2.8
)
Balance as of December 31, 2013

$13.1