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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]  
Estimated Future Benefit Payments [Table Text Block]
Estimated Future Benefit Payments    PensionPostretirement Health and Life
Millions
2021$54.9$8.7 
2022$54.5$8.7 
2023$54.2$8.5 
2024$54.0$8.5 
2025$53.4$8.5 
Years 2026 – 2030$258.0$43.2 
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 3120202019
Discount Rate  
Pension2.62%3.38%
Postretirement Health and Life2.70%3.45%
Rate of Compensation Increase3.61%4.07%
Health Care Trend Rates
Trend Rate5.81%6.06%
Ultimate Trend Rate4.50%4.50%
Year Ultimate Trend Rate Effective20382038

Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31202020192018
Discount Rate
Pension3.52%4.67%4.05%
Postretirement Health and Life3.45%4.47%3.86%
Expected Long-Term Return on Plan Assets (a)
   
Pension6.75%7.25%7.50%
Postretirement Health and Life6.08%6.51%6.72%
Rate of Compensation Increase4.06%4.04%4.03%
(a)The expected long-term rates of return used to determine net periodic benefit expense for 2021 have been reduced to 6.50 percent for pension expense and 5.20 percent to 6.50 percent for postretirement health and life expense.
Plan Asset Actual and Target Allocations [Table Text Block]
Actual Plan Asset AllocationsPension
Postretirement
Health and Life (a)
 2020201920202019
Equity Securities36%34%67%66%
Fixed Income Securities61%62%32%33%
Private Equity1%1%1%1%
Real Estate2%3%——
 100%100%100%100%
(a)Includes VEBAs and irrevocable grantor trusts.
Following are the current targeted allocations as of December 31, 2020:
Plan Asset Target Allocations    Pension
Postretirement
Health and Life (a)
Equity Securities32 %60 %
Fixed Income Securities56 %37 %
Private Equity6 %— 
Real Estate6 %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 3120202019
Millions  
Accumulated Benefit Obligation$931.2$812.0
Change in Benefit Obligation  
Obligation, Beginning of Year$854.0$747.0
Service Cost10.79.3
Interest Cost27.931.9
Actuarial Loss (a)
118.798.3
Benefits Paid(54.4)(53.4)
Participant Contributions8.820.9
Obligation, End of Year$965.7$854.0
Change in Plan Assets  
Fair Value, Beginning of Year$699.6$598.0
Actual Return on Plan Assets93.0122.1
Employer Contribution (b)
21.232.9
Benefits Paid(54.4)(53.4)
Fair Value, End of Year$759.4$699.6
Funded Status, End of Year$(206.3)$(154.4)
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of:  
Current Liabilities$(2.2)$(1.6)
Non-Current Liabilities$(204.1)$(152.8)
(a)    Actuarial loss was primarily the result of decreases in discount rates in 2020 and 2019.
(b)    Includes Participant Contributions noted above.
Amounts Recognized in Consolidated Balance Sheet [Table Text Block]
Reconciliation of Net Pension Amounts Recognized in Consolidated Balance Sheet
As of December 3120202019
Millions  
Net Loss$(299.0)$(243.4)
Prior Service Credit1.11.3
Accumulated Contributions in Excess of Net Periodic Benefit Cost (Prepaid Pension Asset)91.687.7
Total Net Pension Amounts Recognized in Consolidated Balance Sheet$(206.3)$(154.4)
Components of Net Periodic Cost [Table Text Block]
Components of Net Periodic Pension Cost
Year Ended December 31202020192018
Millions   
Service Cost$10.7$9.3$11.0
Non-Service Cost Components (a)
Interest Cost27.931.929.6
Expected Return on Plan Assets(42.7)(44.2)(44.4)
Amortization of Loss12.87.511.4
Amortization of Prior Service Credit(0.2)(0.1)(0.1)
Net Pension Cost$8.5$4.4$7.5
(a)These components of net periodic pension cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.
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 3120202019
Millions  
Projected Benefit Obligation$965.7 $854.0 
Accumulated Benefit Obligation$931.2 $812.0 
Fair Value of Plan Assets$759.4 $699.6 
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities [Table Text Block]
Other Changes in Pension Plan Assets and Benefit Obligations Recognized in
Other Comprehensive Income and Regulatory Assets or Liabilities
Year Ended December 3120202019
Millions  
Net Loss$68.4$20.4
Amortization of Prior Service Credit0.2 0.1 
Amortization of Loss(12.8)(7.5)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities$55.8$13.0
Recurring Fair Value Measures [Table Text Block]
 Fair Value as of December 31, 2020
Recurring Fair Value MeasuresLevel 1Level 2Level 3Total
Millions    
Assets:    
Equity Securities:    
U.S. Large-cap (a)
—$91.7—$91.7
U.S. Mid-cap Growth (a)
—40.0—40.0
U.S. Small-cap (a)
—40.7—40.7
International—97.1—97.1
Fixed Income Securities (a)
—461.7—461.7
Cash and Cash Equivalents$3.2——3.2
Private Equity Funds——$7.07.0
Real Estate——18.018.0
Total Fair Value of Assets$3.2$731.2$25.0$759.4
(a)The underlying investments consist of actively-managed funds managed to achieve the returns of certain U.S. equity and fixed income securities indexes.
 Fair Value as of December 31, 2019
Recurring Fair Value MeasuresLevel 1Level 2Level 3Total
Millions    
Assets:    
Equity Securities:    
U.S. Large-cap (a)
— $78.5 — $78.5 
U.S. Mid-cap Growth (a)
— 35.9 — 35.9 
U.S. Small-cap (a)
— 34.6 — 34.6 
International— 92.1 — 92.1 
Fixed Income Securities (a)
— 425.4 — 425.4 
Cash and Cash Equivalents$7.1 — — 7.1 
Private Equity Funds— — $8.0 8.0 
Real Estate— — 18.0 18.0 
Total Fair Value of Assets$7.1 $666.5 $26.0 $699.6 
(a)The underlying investments consist of actively-managed funds managed to achieve the returns of certain U.S. equity and fixed income securities indexes.
Recurring Fair Value Measures - Activity in Level 3 [Table Text Block]
Recurring Fair Value Measures  
Activity in Level 3Private Equity Funds    Real Estate
Millions  
Balance as of December 31, 2019$8.0$18.0
Actual Return on Plan Assets0.1—
Purchases, Sales, and Settlements – Net(1.1)—
Balance as of December 31, 2020$7.0$18.0
Recurring Fair Value Measures  
Activity in Level 3Private Equity Funds   Real Estate
Millions   
Balance as of December 31, 2018$27.8 $20.8 
Actual Return on Plan Assets0.4 (1.3)
Purchases, Sales, and Settlements – Net(20.2)(1.5)
Balance as of December 31, 2019$8.0 $18.0 
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 3120202019
Millions  
Change in Benefit Obligation  
Obligation, Beginning of Year$149.8$176.0
Service Cost3.33.9
Interest Cost5.07.3
Actuarial Loss (a)
19.210.5
Benefits Paid(12.6)(14.7)
Participant Contributions3.23.5
Plan Amendments (b)
—(34.6)
Plan Curtailments(0.3)(2.1)
Obligation, End of Year$167.6$149.8
Change in Plan Assets  
Fair Value, Beginning of Year$173.7$154.3
Actual Return on Plan Assets20.929.5
Employer Contribution0.81.1
Participant Contributions3.23.5
Benefits Paid(12.6)(14.7)
Fair Value, End of Year$186.0$173.7
Funded Status, End of Year$18.4$23.9
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of:  
Non-Current Assets$34.2$37.5
Current Liabilities$(0.6)$(0.7)
Non-Current Liabilities$(15.2)$(12.9)
(a)Actuarial loss was primarily the result of decreases in discount rates in 2020 and 2019.
(b)Plan design changes under the other postretirement benefit plans resulted in a decrease to the benefit obligation of $34.6 million in 2019.
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 3120202019
Millions  
Net Loss (a)
$(23.0)$(16.0)
Prior Service Credit28.336.3
Accumulated Net Periodic Benefit Cost in Excess of Contributions (a)
13.13.6
Total Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet$18.4$23.9
(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 31202020192018
Millions   
Service Cost$3.3 $3.9 $4.7 
Non-Service Cost Components (a)
Interest Cost5.0 7.3 7.1 
Expected Return on Plan Assets(9.7)(10.5)(10.9)
Amortization of Loss1.0 0.5 0.8 
Amortization of Prior Service Credit(8.0)(2.8)(2.1)
Effect of Plan Curtailment(0.3)(2.1)— 
Net Postretirement Health and Life Credit$(8.7)$(3.7)$(0.4)
(a)These components of net periodic postretirement health and life cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.
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 3120202019
Millions  
Net (Gain) Loss$8.1$(10.6)
Prior Service Credit Arising During the Period— (34.6)
Amortization of Prior Service Credit8.0 2.8 
Amortization of Loss(1.0)(0.5)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities$15.1$(42.9)
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 3120202019
Millions  
Net Loss$23.0$16.0
Prior Service Credit(28.3)(36.3)
Total Unrecognized Postretirement Health and Life Cost$(5.3)$(20.3)
Recurring Fair Value Measures [Table Text Block]
 Fair Value as of December 31, 2020
Recurring Fair Value MeasuresLevel 1Level 2Level 3Total
Millions    
Assets:    
Equity Securities: (a)
    
U.S. Large-cap $34.2 — — $34.2 
U.S. Mid-cap Growth 31.4 — — 31.4 
U.S. Small-cap 16.6 — — 16.6 
International41.5 — — 41.5 
Fixed Income Securities:    
Mutual Funds57.3 — — 57.3 
Debt Securities— $2.2 — 2.2 
Cash and Cash Equivalents1.1 — — 1.1 
Private Equity Funds— — $1.7 1.7 
Total Fair Value of Assets$182.1 $2.2 $1.7 $186.0 
(a)The underlying investments consist of mutual funds (Level 1).
 Fair Value as of December 31, 2019
Recurring Fair Value MeasuresLevel 1Level 2Level 3Total
Millions    
Assets:    
Equity Securities: (a)
    
U.S. Large-cap $33.6 — — $33.6 
U.S. Mid-cap Growth 27.7 — — 27.7 
U.S. Small-cap 14.3 — — 14.3 
International37.8 — — 37.8 
Fixed Income Securities:    
Mutual Funds53.4 — — 53.4 
Debt Securities— $4.1 — 4.1 
Cash and Cash Equivalents1.1 — — 1.1 
Private Equity Funds— — $1.7 1.7 
Total Fair Value of Assets$167.9 $4.1 $1.7 $173.7 
(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 3Private Equity Funds
Millions 
Balance as of December 31, 2019$1.7 
Actual Return on Plan Assets— 
Purchases, Sales, and Settlements – Net— 
Balance as of December 31, 2020$1.7 
Recurring Fair Value Measures
Activity in Level 3Private Equity Funds
Millions 
Balance as of December 31, 2018$6.5 
Actual Return on Plan Assets0.7 
Purchases, Sales, and Settlements – Net(5.5)
Balance as of December 31, 2019$1.7