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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]  
Estimated Future Benefit Payments [Table Text Block]
Estimated Future Benefit Payments
    Pension
Postretirement Health and Life
Millions
 

 
2017

$45.0


$9.3

2018

$45.2


$9.4

2019

$45.4


$9.7

2020

$45.5


$9.9

2021

$45.8


$10.0

Years 2022 – 2026

$231.0


$51.4
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, 2017, are as follows:
 
      Pension
Postretirement
Health and Life
Millions
 
 
Net Loss
$9.9
$0.3
Prior Service Credit
—

(2.0)
Total Pension and Postretirement Health and Life Cost (Credit)
$9.9
$(1.7)
Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs [Table Text Block]
Assumptions Used to Determine Benefit Obligation
As of December 31
2016
2015
Discount Rate
 
 
Pension
4.53%
4.72%
Postretirement Health and Life
4.57%
4.73%
Rate of Compensation Increase
3.70 - 4.30%
3.70 - 4.30%
Health Care Trend Rates
 
 
Trend Rate
5.00 - 7.00%
6.50%
Ultimate Trend Rate
4.50%
5.00%
Year Ultimate Trend Rate Effective
2038
2022
NOTE 15. PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Continued)
Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31
2016
2015
2014
Discount Rate
4.72 - 4.73%
4.30 - 4.33%
4.93 - 4.96%
Expected Long-Term Return on Plan Assets (a)
 
 
 
Pension
8.00%
8.00%
8.00%
Postretirement Health and Life
6.40 - 8.00%
6.40 - 8.00%
6.40 - 8.00%
Rate of Compensation Increase
3.70 - 4.30%
3.70 - 4.30%
3.70 - 4.30%

(a)
The expected long-term rates of return used to determine net periodic benefit expense for 2017 have been reduced to 7.50 percent for pension expense and 6.00 percent to 7.50 percent for postretirement health and life expense.
Plan Asset Actual and Target Allocations [Table Text Block]
Following are the current targeted allocations as of December 31, 2016:
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.
Actual Plan Asset Allocations
Pension
Postretirement
Health and Life (a)
 
2016
2015
2016
2015
Equity Securities
49
%
47
%
60
%
57
%
Debt Securities
39
%
39
%
34
%
35
%
Private Equity
7
%
8
%
6
%
8
%
Real Estate
5
%
6
%
—

—

 
100
%
100
%
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
As of December 31
2016

2015

Millions
 
 
Accumulated Benefit Obligation

$698.8


$665.0

Change in Benefit Obligation
 

 

Obligation, Beginning of Year

$709.8


$714.5

Service Cost
8.1

10.1

Interest Cost
33.2

29.9

Actuarial (Gain) Loss
12.4

(31.2
)
Benefits Paid
(44.5
)
(40.2
)
Participant Contributions
24.3

26.7

Obligation, End of Year

$743.3


$709.8

Change in Plan Assets
 

 

Fair Value, Beginning of Year

$521.3


$544.2

Actual Return on Plan Assets
48.8

(10.8
)
Employer Contribution (a)
31.9

28.1

Benefits Paid
(44.5
)
(40.2
)
Fair Value, End of Year

$557.5


$521.3

Funded Status, End of Year
$(185.8)
$(188.5)
 
 
 
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of:
 

 

Current Liabilities
$(1.4)
$(1.3)
Non-Current Liabilities
$(184.4)
$(187.2)

(a)
Includes Participant Contributions noted above.
Components of Net Periodic Expense [Table Text Block]
Components of Net Periodic Pension Expense
Year Ended December 31
2016

2015

2014

Millions
 
 
 
Service Cost

$8.1


$10.1


$8.3

Interest Cost
33.2

29.9

29.8

Expected Return on Plan Assets
(43.6
)
(40.7
)
(38.2
)
Amortization of Loss
9.5

17.9

14.2

Amortization of Prior Service Cost
—

0.2

0.3

Net Pension Expense

$7.2


$17.4


$14.4
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
2016

2015

Millions
 
 
Net Loss
$7.2

$20.2

Amortization of Prior Service Cost
—

(0.2
)
Amortization of Loss
(9.5
)
(17.9
)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
$(2.3)

$2.1
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
2016

2015

Millions
 
 
Projected Benefit Obligation

$743.3


$709.8

Accumulated Benefit Obligation

$698.8


$665.0

Fair Value of Plan Assets

$557.5


$521.3
Recurring Fair Value Measures [Table Text Block]
 
Fair Value as of December 31, 2015
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$33.9


$42.1

—


$76.0

U.S. Mid-cap Growth (a)
14.2

17.7

—

31.9

U.S. Small-cap (a)
14.5

17.9

—

32.4

Mutual Funds
8.4

—

—

8.4

International
44.7

42.0

—

86.7

Debt Securities:
 

 

 

 

Mutual Funds
0.1

—

—

0.1

Fixed Income
2.7

185.3

—

188.0

Cash and Cash Equivalents
25.6

—

—

25.6

Private Equity Funds
—

—


$43.3

43.3

Real Estate
—

—

28.9

28.9

Total Fair Value of Assets

$144.1


$305.0


$72.2


$521.3

(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, 2016
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$94.6

—

—


$94.6

U.S. Mid-cap Growth (a)
—


$44.8

—

44.8

U.S. Small-cap (a)
—

45.0

—

45.0

International
46.7

42.3

—

89.0

Debt Securities:
 

 

 

 

Fixed Income
—

200.1

—

200.1

Cash and Cash Equivalents
17.8

—

—

17.8

Private Equity Funds
—

—


$40.6

40.6

Real Estate
—

—

25.6

25.6

Total Fair Value of Assets

$159.1


$332.2


$66.2


$557.5

(a)
The underlying investments classified under U.S. Equity Securities consist of money market funds (Level 1), mutual 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 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, 2014
 

$43.3


$28.9

Actual Return on Plan Assets
 
2.6

2.9

Purchases, Sales, and Settlements – Net
 
(2.6
)
(2.9
)
Balance as of December 31, 2015
 

$43.3


$28.9

Recurring Fair Value Measures
 
 
Activity in Level 3
Private Equity Funds
    Real Estate
Millions
 
 
Balance as of December 31, 2015

$43.3


$28.9

Actual Return on Plan Assets
5.0

2.3

Purchases, Sales, and Settlements – Net
(7.7
)
(5.6
)
Balance as of December 31, 2016

$40.6


$25.6
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
As of December 31
2016

2015

Millions
 
 
Change in Benefit Obligation
 
 
Obligation, Beginning of Year

$160.2


$170.9

Service Cost
3.9

4.3

Interest Cost
7.4

7.2

Actuarial (Gain) Loss
11.9

(14.4
)
Benefits Paid
(13.1
)
(10.7
)
Participant Contributions
3.1

2.9

Obligation, End of Year

$173.4


$160.2

Change in Plan Assets
 
 
Fair Value, Beginning of Year

$153.4


$163.2

Actual Return on Plan Assets
9.6

(3.5
)
Employer Contribution
1.3

1.5

Participant Contributions
3.1

2.9

Benefits Paid
(13.1
)
(10.7
)
Fair Value, End of Year

$154.3


$153.4

Funded Status, End of Year
$(19.1)
$(6.8)
 
 
 
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of:
 
 
Non-Current Assets
$1.4
$6.4
Current Liabilities
$(1.1)
$(1.0)
Non-Current Liabilities
$(19.4)
$(12.2)
Unrecognized Costs [Table Text Block]
The postretirement health and life costs that are reported as a component within the 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
2016

2015

Millions
 
 
Net Loss
$19.8
$6.5
Prior Service Credit
(4.7
)
(7.6
)
Total Unrecognized Postretirement Health and Life Cost (Credit)
$15.1
$(1.1)
Components of Net Periodic Expense [Table Text Block]
Components of Net Periodic Postretirement Health and Life Expense
Year Ended December 31
2016

2015

2014

Millions
 
 
 
Service Cost

$3.9


$4.3


$3.4

Interest Cost
7.4

7.2

7.3

Expected Return on Plan Assets
(11.2
)
(10.9
)
(10.3
)
Amortization of Loss
0.2

0.4

0.5

Amortization of Prior Service Credit
(2.9
)
(3.0
)
(2.5
)
Net Postretirement Health and Life Credit
$(2.6)
$(2.0)
$(1.6)
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
2016

2015

Millions
 

 
Net Loss

$13.5

—

Amortization of Prior Service Credit
2.9


$3.0

Amortization of Loss
(0.2
)
(0.4
)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
$16.2
$2.6
Sensitivity of a One Percent Change in Health Care Trend Rates [Table Text Block]
Sensitivity of a One Percent 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

$20.1

$(16.7)
Effect on Postretirement Health and Life Obligation

$1.8

$(1.4)
Recurring Fair Value Measures [Table Text Block]
 
Fair Value as of December 31, 2016
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$27.9

—

—


$27.9

U.S. Mid-cap Growth (a)
20.7

—

—

20.7

U.S. Small-cap (a)
14.0

—

—

14.0

International
27.9

—

—

27.9

Debt Securities:
 

 

 

 

Mutual Funds
48.6

—

—

48.6

Fixed Income
—


$4.6

—

4.6

Cash and Cash Equivalents
1.1

—

—

1.1

Private Equity Funds
—

—


$9.5

9.5

Total Fair Value of Assets

$140.2


$4.6


$9.5


$154.3


(a)
The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).
 
Fair Value as of December 31, 2015
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)

$28.2

—

—


$28.2

U.S. Mid-cap Growth (a)
19.1

—

—

19.1

U.S. Small-cap (a)
12.1

—

—

12.1

International
26.8

—

—

26.8

Debt Securities:
 

 

 

 

Mutual Funds
45.2

—

—

45.2

Fixed Income
—


$8.4

—

8.4

Cash and Cash Equivalents
1.6

—

—

1.6

Private Equity Funds
—

—


$12.0

12.0

Total Fair Value of Assets

$133.0


$8.4


$12.0


$153.4


(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, 2014

$12.9

Actual Return on Plan Assets
1.2

Purchases, Sales, and Settlements – Net
(2.1
)
Balance as of December 31, 2015

$12.0

Recurring Fair Value Measures
 
Activity in Level 3
Private Equity Funds
Millions
 
Balance as of December 31, 2015

$12.0

Actual Return on Plan Assets
1.4

Purchases, Sales, and Settlements – Net
(3.9
)
Balance as of December 31, 2016

$9.5