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Pension and Other Postretirement Benefit Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |
Estimated Future Benefit Payments [Table Text Block] |
Estimated Future Benefit Payments | Pension | Postretirement Health and Life
Millions |  |
2022 | $54.6 | $8.4 |
2023 | $54.4 | $8.4 |
2024 | $54.4 | $8.4 |
2025 | $53.8 | $8.2 |
2026 | $53.1 | $8.1 |
Years 2027 – 2031 | $257.2 | $41.6 |
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 | 2021 | 2020
Discount Rate |  |
Pension | 3.05% | 2.62%
Postretirement Health and Life | 3.09% | 2.70%
Rate of Compensation Increase | 3.58% | 3.61%
Health Care Trend Rates |  |
Trend Rate | 5.66% | 5.81%
Ultimate Trend Rate | 4.50% | 4.50%
Year Ultimate Trend Rate Effective | 2038 | 2038
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31 | 2021 | 2020 | 2019
Discount Rate |  |  |
Pension | 2.87% | 3.52% | 4.67%
Postretirement Health and Life | 2.70% | 3.45% | 4.47%
Expected Long-Term Return on Plan Assets (a) |  |  |
Pension | 6.50% | 6.75% | 7.25%
Postretirement Health and Life | 5.85% | 6.08% | 6.51%
Rate of Compensation Increase | 3.62% | 4.06% | 4.04%
(a)The expected long-term rates of return used to determine net periodic benefit expense for 2022 have been reduced to 6.00 percent for pension expense and 4.80 percent to 6.00 percent for postretirement health and life expense.
Plan Asset Actual and Target Allocations [Table Text Block] |
Actual Plan Asset Allocations | Pension | Postretirement Health and Life (a)
| 2021 | 2020 | 2021 | 2020
Equity Securities | 49% | 36% | 70% | 67%
Fixed Income Securities | 48% | 61% | 29% | 32%
Private Equity | — | 1 | 1% | 1%
Real Estate | 3% | 2% | — | —
| 100% | 100% | 100% | 100%
(a)Includes VEBAs and irrevocable grantor trusts. Following are the current targeted allocations as of December 31, 2021:
Plan Asset Target Allocations | Pension | Postretirement Health and Life (a)
Equity Securities | 49 | % | 60 | %
Fixed Income Securities | 49 | % | 37 | %
Private Equity | 1 | % | — |
Real Estate | 1 | % | 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 | 2021 | 2020
Millions |  |
Accumulated Benefit Obligation | $875.5 | $931.2
Change in Benefit Obligation |  |
Obligation, Beginning of Year | $965.7 | $854.0
Service Cost | 11.0 | 10.7
Interest Cost | 24.6 | 27.9
Plan Curtailments | (1.4) | —
Actuarial (Gain) Loss (a) | (39.0) | 118.7
Benefits Paid | (56.5) | (54.4)
Participant Contributions | 7.3 | 8.8
Obligation, End of Year | $911.7 | $965.7
Change in Plan Assets |  |
Fair Value, Beginning of Year | $759.4 | $699.6
Actual Return on Plan Assets | 23.1 | 93.0
Employer Contribution (b) | 19.7 | 21.2
Benefits Paid | (56.5) | (54.4)
Fair Value, End of Year | $745.7 | $759.4
Funded Status, End of Year | $(166.0) | $(206.3)
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of: |  |
Current Liabilities | $(2.1) | $(2.2)
Non-Current Liabilities | $(163.9) | $(204.1)
(a) Actuarial (gain) loss was primarily the result of increases in discount rates in 2021 compared to decreases in 2020. (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 31 | 2021 | 2020
Millions |  |
Net Loss | $(260.2) | $(299.0)
Prior Service Credit | 1.0 | 1.1
Accumulated Contributions in Excess of Net Periodic Benefit Cost (Prepaid Pension Asset) | 93.2 | 91.6
Total Net Pension Amounts Recognized in Consolidated Balance Sheet | $(166.0) | $(206.3)
Components of Net Periodic Cost [Table Text Block] |
Components of Net Periodic Pension Cost
Year Ended December 31 | 2021 | 2020 | 2019
Millions |  |  |
Service Cost | $11.0 | $10.7 | $9.3
Non-Service Cost Components (a) |  |  |
Interest Cost | 24.6 | 27.9 | 31.9
Expected Return on Plan Assets | (43.4) | (42.7) | (44.2)
Amortization of Loss | 18.8 | 12.8 | 7.5
Amortization of Prior Service Credit | (0.2) | (0.2) | (0.1)
Net Pension Cost | $10.8 | $8.5 | $4.4
(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 31 | 2021 | 2020
Millions |  |
Projected Benefit Obligation | $911.7 |  | $965.7 |
Accumulated Benefit Obligation | $875.5 |  | $931.2 |
Fair Value of Plan Assets | $745.7 |  | $759.4 |
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 | 2021 | 2020
Millions |  |
Net (Gain) Loss | $(20.1) | $68.4
Amortization of Prior Service Credit | 0.2 |  | 0.2 |
Amortization of Loss | (18.8) |  | (12.8) |
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities | $(38.7) | $55.8
Recurring Fair Value Measures [Table Text Block] |
| Fair Value as of December 31, 2021
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: |  |  |  |
U.S. Large-cap (a) | — | $113.8 | — | $113.8
U.S. Mid-cap Growth (a) | — | 47.6 | — | 47.6
U.S. Small-cap (a) | — | 46.2 | — | 46.2
International | — | 158.2 | — | 158.2
Fixed Income Securities (a) | — | 346.1 | — | 346.1
Cash and Cash Equivalents | $12.2 | — | — | 12.2
Private Equity Funds | — | — | — | —
Real Estate | — | — | $21.6 | 21.6
Total Fair Value of Assets | $12.2 | $711.9 | $21.6 | $745.7
(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, 2020
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
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 | — |  | — |  | $7.0 |  | 7.0 |
Real Estate | — |  | — |  | 18.0 |  | 18.0 |
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.
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, 2020 | $7.0 | $18.0
Actual Return on Plan Assets | (3.5) | 3.6
Purchases, Sales, and Settlements – Net | (3.5) | —
Balance as of December 31, 2021 | — | $21.6
Recurring Fair Value Measures |  |  |
Activity in Level 3 |  | Private Equity Funds | Real Estate
Millions |  |  |
Balance as of December 31, 2019 |  | $8.0 |  | $18.0 |
Actual Return on Plan Assets |  | 0.1 |  | — |
Purchases, Sales, and Settlements – Net |  | (1.1) |  | — |
Balance as of December 31, 2020 |  | $7.0 |  | $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 31 | 2021 | 2020
Millions |  |
Change in Benefit Obligation |  |
Obligation, Beginning of Year | $167.6 | $149.8
Service Cost | 3.6 | 3.3
Interest Cost | 4.4 | 5.0
Actuarial (Gain) Loss (a) | (19.7) | 19.2
Benefits Paid | (10.6) | (12.6)
Participant Contributions | 2.9 | 3.2
Plan Curtailments | — | (0.3)
Obligation, End of Year | $148.2 | $167.6
Change in Plan Assets |  |
Fair Value, Beginning of Year | $186.0 | $173.7
Actual Return on Plan Assets | 22.8 | 20.9
Employer Contribution | 0.7 | 0.8
Participant Contributions | 2.9 | 3.2
Benefits Paid | (10.6) | (12.6)
Fair Value, End of Year | $201.8 | $186.0
Funded Status, End of Year | $53.6 | $18.4
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of: |  |
Non-Current Assets | $64.8 | $34.2
Current Liabilities | $(1.4) | $(0.6)
Non-Current Liabilities | $(9.8) | $(15.2)
(a)Actuarial (gain) loss was primarily the result of increases in discount rates in 2021 compared to decreases in 2020.
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 | 2021 | 2020
Millions |  |
Net Gain (Loss) (a) | $12.7 | $(23.0)
Prior Service Credit | 20.7 | 28.3
Accumulated Net Periodic Benefit Cost in Excess of Contributions (a) | 20.2 | 13.1
Total Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet | $53.6 | $18.4
(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 | 2021 | 2020 | 2019
Millions |  |  |
Service Cost | $3.6 |  | $3.3 |  | $3.9 |
Non-Service Cost Components (a) |  |  |
Interest Cost | 4.4 |  | 5.0 |  | 7.3 |
Expected Return on Plan Assets | (9.9) |  | (9.7) |  | (10.5) |
Amortization of Loss | 3.0 |  | 1.0 |  | 0.5 |
Amortization of Prior Service Credit | (7.6) |  | (8.0) |  | (2.8) |
Effect of Plan Curtailment | — |  | (0.3) |  | (2.1) |
Net Postretirement Health and Life Credit | $(6.5) | $(8.7) | $(3.7)
(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 31 | 2021 | 2020
Millions |  |
Net (Gain) Loss | $(32.7) | $8.1
Amortization of Prior Service Credit | 7.6 |  | 8.0 |
Amortization of Loss | (3.0) |  | (1.0) |
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities | $(28.1) | $15.1
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 | 2021 | 2020
Millions |  |
Net (Gain) Loss | $(12.7) | $23.0
Prior Service Credit | (20.7) | (28.3)
Total Unrecognized Postretirement Health and Life Cost | $(33.4) | $(5.3)
Recurring Fair Value Measures [Table Text Block] |
| Fair Value as of December 31, 2021
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: (a) |  |  |  |
U.S. Large-cap | $40.1 |  | — |  | — |  | $40.1 |
U.S. Mid-cap Growth | 37.3 |  | — |  | — |  | 37.3 |
U.S. Small-cap | 19.3 |  | — |  | — |  | 19.3 |
International | 43.7 |  | — |  | — |  | 43.7 |
Fixed Income Securities: |  |  |  |
Mutual Funds | 56.7 |  | — |  | — |  | 56.7 |
Debt Securities | — |  | $1.8 |  | — |  | 1.8 |
Cash and Cash Equivalents | 0.9 |  | — |  | — |  | 0.9 |
Private Equity Funds | — |  | — |  | $2.0 |  | 2.0 |
Total Fair Value of Assets | $198.0 |  | $1.8 |  | $2.0 |  | $201.8 |
(a)The underlying investments consist of mutual funds (Level 1).
| Fair Value as of December 31, 2020
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
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 |
International | 41.5 |  | — |  | — |  | 41.5 |
Fixed Income Securities: |  |  |  |
Mutual Funds | 57.3 |  | — |  | — |  | 57.3 |
Debt Securities | — |  | $2.2 |  | — |  | 2.2 |
Cash and Cash Equivalents | 1.1 |  | — |  | — |  | 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).
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, 2020 | $1.7 |
Actual Return on Plan Assets | 0.8 |
Purchases, Sales, and Settlements – Net | (0.5) |
Balance as of December 31, 2021 | $2.0 |
Recurring Fair Value Measures |
Activity in Level 3 | Private 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 |

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