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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]  
Estimated Future Benefit Payments [Table Text Block]
Estimated Future Benefit Payments
    Pension
Postretirement Health and Life
Millions
 

 
2018

$46.3


$9.2

2019

$46.2


$9.5

2020

$45.9


$9.6

2021

$45.8


$9.6

2022

$45.8


$9.6

Years 2023 – 2027

$228.0


$49.7
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, 2018, are as follows:
 
      Pension
Postretirement
Health and Life
Millions
 
 
Net Loss
$12.0
$0.7
Prior Service Credit
—

(1.8
)
Total Pension and Postretirement Health and Life Cost (Credit)
$12.0
$(1.1)
Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs [Table Text Block]
Assumptions Used to Determine Benefit Obligation
As of December 31
2017
2016
Discount Rate
 
 
Pension
3.81 - 3.96%
4.53%
Postretirement Health and Life
3.86%
4.57%
Rate of Compensation Increase
3.70 - 4.10%
3.70 - 4.30%
Health Care Trend Rates
 
 
Trend Rate
5.00 - 6.73%
5.00 - 7.00%
Ultimate Trend Rate
4.50%
4.50%
Year Ultimate Trend Rate Effective
2038
2038
Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31
2017
2016
2015
Discount Rate
4.53 - 4.57%
4.72 - 4.73%
4.30 - 4.33%
Expected Long-Term Return on Plan Assets
 
 
 
Pension
7.50%
8.00%
8.00%
Postretirement Health and Life
6.00 - 7.50%
6.40 - 8.00%
6.40 - 8.00%
Rate of Compensation Increase
3.70 - 4.30%
3.70 - 4.30%
3.70 - 4.30%
Plan Asset Actual and Target Allocations [Table Text Block]
Actual Plan Asset Allocations
Pension
Postretirement
Health and Life (a)
 
2017
2016
2017
2016
Equity Securities
53
%
49
%
64
%
60
%
Debt Securities
38
%
39
%
31
%
34
%
Private Equity
5
%
7
%
5
%
6
%
Real Estate
4
%
5
%
—

—

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

Following are the current targeted allocations as of December 31, 2017:
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
As of December 31
2017

2016

Millions
 
 
Accumulated Benefit Obligation

$745.4


$698.8

Change in Benefit Obligation
 

 

Obligation, Beginning of Year

$743.3


$709.8

Service Cost
10.2

8.1

Interest Cost
32.5

33.2

Actuarial Loss
44.8

12.4

Benefits Paid
(51.0
)
(44.5
)
Participant Contributions
13.4

24.3

Obligation, End of Year

$793.2


$743.3

Change in Plan Assets
 

 

Fair Value, Beginning of Year

$557.5


$521.3

Actual Return on Plan Assets
91.6

48.8

Employer Contribution (a)
30.1

31.9

Benefits Paid
(51.0
)
(44.5
)
Fair Value, End of Year

$628.2


$557.5

Funded Status, End of Year
$(165.0)
$(185.8)
 
 
 
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of:
 

 

Current Liabilities
$(1.4)
$(1.4)
Non-Current Liabilities
$(163.6)
$(184.4)

(a)
Includes Participant Contributions noted above.
Amounts Recognized in Consolidated Balance Sheet [Table Text Block]
Reconciliation of Net Pension Amounts Recognized in Consolidated Balance Sheet
As of December 31
2017

2016

Millions
 
 
Net Loss
$(236.2)
$(250.4)
Accumulated Contributions in Excess of Net Periodic Benefit Cost (Prepaid Pension Asset)
71.2

64.6

Total Net Pension Amounts Recognized in Consolidated Balance Sheet
$(165.0)
$(185.8)
Components of Net Periodic Cost [Table Text Block]
Components of Net Periodic Pension Cost
Year Ended December 31
2017

2016

2015

Millions
 
 
 
Service Cost

$10.2


$8.1


$10.1

Interest Cost
32.5

33.2

29.9

Expected Return on Plan Assets
(42.4
)
(43.6
)
(40.7
)
Amortization of Loss
9.9

9.5

17.9

Amortization of Prior Service Cost
—

—

0.2

Net Pension Cost

$10.2


$7.2


$17.4
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
2017

2016

Millions
 
 
Net (Gain) Loss
$(4.3)

$7.2

Amortization of Loss
(9.9
)
(9.5
)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
$(14.2)
$(2.3)
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
2017

2016

Millions
 
 
Projected Benefit Obligation

$793.2


$743.3

Accumulated Benefit Obligation

$745.4


$698.8

Fair Value of Plan Assets

$628.2


$557.5
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)

$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.
 
Fair Value as of December 31, 2017
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities:
 
 
 
 
U.S. Large-cap (a)
—


$108.6

—


$108.6

U.S. Mid-cap Growth (a)
—

51.9

—

51.9

U.S. Small-cap (a)
—

51.5

—

51.5

International
—

122.3

—

122.3

Debt Securities:
 

 

 

 

Fixed Income
—

222.8

—

222.8

Cash and Cash Equivalents

$12.4

—

—

12.4

Private Equity Funds
—

—


$33.2

33.2

Real Estate
—

—

25.5

25.5

Total Fair Value of Assets

$12.4


$557.1


$58.7


$628.2

(a)
The underlying investments consist of actively-managed funds managed to achieve the returns of certain U.S. equity securities large‑cap, mid-cap and small-cap indexes.
Recurring Fair Value Measures
 
 
Activity in Level 3
Private Equity Funds
    Real Estate
Millions
 
 
Balance as of December 31, 2016

$40.6


$25.6

Actual Return on Plan Assets
7.1

1.7

Purchases, Sales, and Settlements – Net
(14.5
)
(1.8
)
Balance as of December 31, 2017

$33.2


$25.5
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, 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

Recurring Fair Value Measures
 
 
Activity in Level 3
Private Equity Funds
    Real Estate
Millions
 
 
Balance as of December 31, 2016

$40.6


$25.6

Actual Return on Plan Assets
7.1

1.7

Purchases, Sales, and Settlements – Net
(14.5
)
(1.8
)
Balance as of December 31, 2017

$33.2


$25.5
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
2017

2016

Millions
 
 
Change in Benefit Obligation
 
 
Obligation, Beginning of Year

$173.4


$160.2

Service Cost
4.4

3.9

Interest Cost
7.7

7.4

Actuarial Loss
15.5

11.9

Benefits Paid
(12.2
)
(13.1
)
Participant Contributions
3.1

3.1

Plan Amendments
(1.8
)
—

Obligation, End of Year

$190.1


$173.4

Change in Plan Assets
 
 
Fair Value, Beginning of Year

$154.3


$153.4

Actual Return on Plan Assets
24.5

9.6

Employer Contribution
1.3

1.3

Participant Contributions
3.1

3.1

Benefits Paid
(12.2
)
(13.1
)
Fair Value, End of Year

$171.0


$154.3

Funded Status, End of Year
$(19.1)
$(19.1)
 
 
 
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of:
 
 
Non-Current Assets
$3.0
$1.4
Current Liabilities
$(1.1)
$(1.1)
Non-Current Liabilities
$(21.0)
$(19.4)
Amounts Recognized in Consolidated Balance Sheet [Table Text Block]
Reconciliation of Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet
As of December 31
2017

2016

Millions
 
 
Net Loss (a)
$(21.1)
$(19.8)
Prior Service Credit
4.6

4.7

Accumulated Net Periodic Benefit Cost in Excess of Contributions (a)
(2.6
)
(4.0
)
Total Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet
$(19.1)
$(19.1)
(a)
Excludes gains, losses and contributions associated with irrevocable grantor trusts.
Components of Net Periodic Cost [Table Text Block]
Components of Net Periodic Postretirement Health and Life Cost
Year Ended December 31
2017

2016

2015

Millions
 
 
 
Service Cost

$4.4


$3.9


$4.3

Interest Cost
7.7

7.4

7.2

Expected Return on Plan Assets
(10.5
)
(11.2
)
(10.9
)
Amortization of Loss
0.3

0.2

0.4

Amortization of Prior Service Credit
(2.0
)
(2.9
)
(3.0
)
Net Postretirement Health and Life Credit
$(0.1)
$(2.6)
$(2.0)
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
2017

2016

Millions
 

 
Net Loss

$1.6


$13.5

Prior Service Credit Arising During the Period
(1.8
)
—

Amortization of Prior Service Credit
2.0

2.9

Amortization of Loss
(0.3
)
(0.2
)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
$1.5
$16.2
Unrecognized Postretirement Health and Life 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
2017

2016

Millions
 
 
Net Loss
$21.1
$19.8
Prior Service Credit
(4.6
)
(4.7
)
Total Unrecognized Postretirement Health and Life Cost
$16.5
$15.1
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

$1.9


($1.5
)
Effect on Postretirement Health and Life Obligation

$23.4


($19.3
)
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: (a)
 
 
 
 
U.S. Large-cap

$27.9

—

—


$27.9

U.S. Mid-cap Growth
20.7

—

—

20.7

U.S. Small-cap
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 consist of mutual funds (Level 1). 
 
Fair Value as of December 31, 2017
Recurring Fair Value Measures
Level 1
Level 2
Level 3
Total
Millions
 
 
 
 
Assets:
 
 
 
 
Equity Securities: (a)
 
 
 
 
U.S. Large-cap

$32.1

—

—


$32.1

U.S. Mid-cap Growth
24.3

—

—

24.3

U.S. Small-cap
15.5

—

—

15.5

International
35.8

—

—

35.8

Debt Securities:
 

 

 

 

Mutual Funds
49.8

—

—

49.8

Fixed Income
—


$4.5

—

4.5

Cash and Cash Equivalents
0.8

—

—

0.8

Private Equity Funds
—

—


$8.2

8.2

Total Fair Value of Assets

$158.3


$4.5


$8.2


$171.0


(a)
The underlying investments 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, 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

Recurring Fair Value Measures
 
Activity in Level 3
Private Equity Funds
Millions
 
Balance as of December 31, 2016

$9.5

Actual Return on Plan Assets
2.6

Purchases, Sales, and Settlements – Net
(3.9
)
Balance as of December 31, 2017

$8.2