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Pension and Other Postretirement Benefit Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |
Estimated Future Benefit Payments [Table Text Block] |
Estimated Future Benefit Payments | Pension | Postretirement Health and Life
Millions |  |
2019 |  | $47.9 |  |  | $9.7 |
2020 |  | $47.4 |  |  | $9.7 |
2021 |  | $47.3 |  |  | $9.8 |
2022 |  | $47.1 |  |  | $9.8 |
2023 |  | $47.0 |  |  | $9.7 |
Years 2024 – 2028 |  | $231.1 |  |  | $51.1 |
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, 2019, are as follows:
| Pension | Postretirement Health and Life
Millions |  |
Net Loss | $7.3 | $0.4
Prior Service Credit | (0.2 | ) | (1.7 | )
Total Pension and Postretirement Health and Life Cost (Credit) | $7.1 | $(1.3)
Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs [Table Text Block] |
Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31 | 2018 | 2017 | 2016
Discount Rate | 3.81 - 3.96% | 4.53 - 4.57% | 4.72 - 4.73%
Expected Long-Term Return on Plan Assets |  |  |
Pension | 7.50% | 7.50% | 8.00%
Postretirement Health and Life | 6.00 - 7.50% | 6.00 - 7.50% | 6.40 - 8.00%
Rate of Compensation Increase | 3.70 - 4.10% | 3.70 - 4.30% | 3.70 - 4.30%
Assumptions Used to Determine Benefit Obligation
As of December 31 | 2018 | 2017
Discount Rate |  |
Pension | 4.39 - 4.53% | 3.81 - 3.96%
Postretirement Health and Life | 4.47% | 3.86%
Rate of Compensation Increase | 3.70 - 4.10% | 3.70 - 4.10%
Health Care Trend Rates |  |
Trend Rate | 5.00 - 6.46% | 5.00 - 6.73%
Ultimate Trend Rate | 4.50% | 4.50%
Year Ultimate Trend Rate Effective | 2038 | 2038
Plan Asset Actual and Target Allocations [Table Text Block] | Following are the current targeted allocations as of December 31, 2018:
Plan Asset Target Allocations | Pension | Postretirement Health and Life (a)
Equity Securities | 32 | % | 60 | %
Fixed Income Securities | 56 | % | 37 | %
Private Equity | 6 | % | 3 | %
Real Estate | 6 | % | — |
| 100 | % | 100 | %
(a) | Includes VEBAs and irrevocable grantor trusts.
Actual Plan Asset Allocations | Pension | Postretirement Health and Life (a)
| 2018 | 2017 | 2018 | 2017
Equity Securities | 32 | % | 53 | % | 62 | % | 64 | %
Fixed Income Securities | 60 | % | 38 | % | 34 | % | 31 | %
Private Equity | 5 | % | 5 | % | 4 | % | 5 | %
Real Estate | 3 | % | 4 | % | — |  | — |
| 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 | 2018 |  | 2017 |
Millions |  |
Accumulated Benefit Obligation |  | $713.7 |  |  | $745.4 |
Change in Benefit Obligation |  |  |  |
Obligation, Beginning of Year |  | $793.2 |  |  | $743.3 |
Service Cost | 11.0 |  | 10.2 |
Interest Cost | 29.6 |  | 32.5 |
Plan Amendments | (1.5 | ) | — |
Plan Curtailments | (6.9 | ) | — |
Actuarial (Gain) Loss | (53.0 | ) | 44.8 |
Benefits Paid | (49.5 | ) | (51.0 | )
Participant Contributions | 24.1 |  | 13.4 |
Obligation, End of Year |  | $747.0 |  |  | $793.2 |
Change in Plan Assets |  |  |  |
Fair Value, Beginning of Year |  | $628.2 |  |  | $557.5 |
Actual Return on Plan Assets | (21.2 | ) | 91.6 |
Employer Contribution (a) | 40.5 |  | 30.1 |
Benefits Paid | (49.5 | ) | (51.0 | )
Fair Value, End of Year |  | $598.0 |  |  | $628.2 |
Funded Status, End of Year | $(149.0) | $(165.0)
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of: |  |  |  |
Current Liabilities | $(1.6) | $(1.4)
Non-Current Liabilities | $(147.4) | $(163.6)
(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 | 2018 |  | 2017 |
Millions |  |
Net Loss | $(230.5) | $(236.2)
Prior Service Cost | 1.4 |  | — |
Accumulated Contributions in Excess of Net Periodic Benefit Cost (Prepaid Pension Asset) | 80.1 |  | 71.2 |
Total Net Pension Amounts Recognized in Consolidated Balance Sheet | $(149.0) | $(165.0)
Components of Net Periodic Cost [Table Text Block] |
Components of Net Periodic Pension Cost
Year Ended December 31 | 2018 |  | 2017 |  | 2016 |
Millions |  |  |
Service Cost |  | $11.0 |  |  | $10.2 |  |  | $8.1 |
Non-Service Cost Components (a) |  |  |
Interest Cost | 29.6 |  | 32.5 |  | 33.2 |
Expected Return on Plan Assets | (44.4 | ) | (42.4 | ) | (43.6 | )
Amortization of Loss | 11.4 |  | 9.9 |  | 9.5 |
Amortization of Prior Service Cost | (0.1 | ) | — |  | — |
Net Pension Cost |  | $7.5 |  |  | $10.2 |  |  | $7.2 |
(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 | 2018 |  | 2017 |
Millions |  |
Projected Benefit Obligation |  | $747.0 |  |  | $793.2 |
Accumulated Benefit Obligation |  | $713.7 |  |  | $745.4 |
Fair Value of Plan Assets |  | $598.0 |  |  | $628.2 |
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 | 2018 |  | 2017 |
Millions |  |
Net (Gain) Loss | $5.8 | $(4.3)
Amortization of Prior Service Cost | 0.1 |  | — |
Prior Service Cost Arising During the Period | (1.6 | ) | — |
Amortization of Loss | (11.4 | ) | (9.9 | )
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities | $(7.1) | $(14.2)
Recurring Fair Value Measures [Table Text Block] |
| Fair Value as of December 31, 2018
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: |  |  |  |
U.S. Large-cap (a) | — |  |  | $59.1 |  | — |  |  | $59.1 |
U.S. Mid-cap Growth (a) | — |  | 28.1 |  | — |  | 28.1 |
U.S. Small-cap (a) | — |  | 27.2 |  | — |  | 27.2 |
International | — |  | 75.8 |  | — |  | 75.8 |
Fixed Income Securities | — |  | 352.9 |  | — |  | 352.9 |
Cash and Cash Equivalents |  | $6.3 |  | — |  | — |  | 6.3 |
Private Equity Funds | — |  | — |  |  | $27.8 |  | 27.8 |
Real Estate | — |  | — |  | 20.8 |  | 20.8 |
Total Fair Value of Assets |  | $6.3 |  |  | $543.1 |  |  | $48.6 |  |  | $598.0 |
(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.
NOTE 15. PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Continued) Fair Value (Continued)
Recurring Fair Value Measures |  |
Activity in Level 3 | Private Equity Funds | Real Estate
Millions |  |
Balance as of December 31, 2017 |  | $33.2 |  |  | $25.5 |
Actual Return on Plan Assets | 2.8 |  | 0.7 |
Purchases, Sales, and Settlements – Net | (8.2 | ) | (5.4 | )
Balance as of December 31, 2018 |  | $27.8 |  |  | $20.8 |
| 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 |
Fixed Income Securities | — |  | 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, 2017 |  | $33.2 |  |  | $25.5 |
Actual Return on Plan Assets | 2.8 |  | 0.7 |
Purchases, Sales, and Settlements – Net | (8.2 | ) | (5.4 | )
Balance as of December 31, 2018 |  | $27.8 |  |  | $20.8 |
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 | 2018 |  | 2017 |
Millions |  |
Change in Benefit Obligation |  |
Obligation, Beginning of Year |  | $190.1 |  |  | $173.4 |
Service Cost | 4.7 |  | 4.4 |
Interest Cost | 7.1 |  | 7.7 |
Actuarial (Gain) Loss | (15.8 | ) | 15.5 |
Benefits Paid | (11.6 | ) | (12.2 | )
Participant Contributions | 3.6 |  | 3.1 |
Plan Amendments | (2.1 | ) | (1.8 | )
Obligation, End of Year |  | $176.0 |  |  | $190.1 |
Change in Plan Assets |  |
Fair Value, Beginning of Year |  | $171.0 |  |  | $154.3 |
Actual Return on Plan Assets | (9.6 | ) | 24.5 |
Employer Contribution | 1.0 |  | 1.3 |
Participant Contributions | 3.6 |  | 3.1 |
Benefits Paid | (11.7 | ) | (12.2 | )
Fair Value, End of Year |  | $154.3 |  |  | $171.0 |
Funded Status, End of Year | $(21.7) | $(19.1)
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of: |  |
Non-Current Assets | $0.4 | $3.0
Current Liabilities | $(1.0) | $(1.1)
Non-Current Liabilities | $(21.1) | $(21.0)
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 | 2018 |  | 2017 |
Millions |  |
Net Loss (a) | $(25.0) | $(21.1)
Prior Service Credit | 4.6 |  | 4.6 |
Accumulated Net Periodic Benefit Cost in Excess of Contributions (a) | (1.3 | ) | (2.6 | )
Total Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet | $(21.7) | $(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 | 2018 |  | 2017 |  | 2016 |
Millions |  |  |
Service Cost |  | $4.7 |  |  | $4.4 |  |  | $3.9 |
Non-Service Cost Components (a) |  |  |
Interest Cost | 7.1 |  | 7.7 |  | 7.4 |
Expected Return on Plan Assets | (10.9 | ) | (10.5 | ) | (11.2 | )
Amortization of Loss | 0.8 |  | 0.3 |  | 0.2 |
Amortization of Prior Service Credit | (2.1 | ) | (2.0 | ) | (2.9 | )
Net Postretirement Health and Life Credit | $(0.4) | $(0.1) | $(2.6)
(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 | 2018 |  | 2017 |
Millions |  |  |
Net Loss |  | $4.7 |  |  | $1.6 |
Prior Service Credit Arising During the Period | (2.1 | ) | (1.8 | )
Amortization of Prior Service Credit | 2.1 |  | 2.0 |
Amortization of Loss | (0.8 | ) | (0.3 | )
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities | $3.9 | $1.5
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 | 2018 |  | 2017 |
Millions |  |
Net Loss | $25.0 | $21.1
Prior Service Credit | (4.6 | ) | (4.6 | )
Total Unrecognized Postretirement Health and Life Cost | $20.4 | $16.5
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 |  | $2.0 |  | $(1.6)
Effect on Postretirement Health and Life Obligation |  | $20.7 |  | $(17.2)
Recurring Fair Value Measures [Table Text Block] |
| 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 |
Fixed Income Securities: |  |  |  |  |  |  |  |
Mutual Funds | 49.8 |  | — |  | — |  | 49.8 |
Debt Securities | — |  |  | $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).
| Fair Value as of December 31, 2018
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: (a) |  |  |  |
U.S. Large-cap |  | $29.1 |  | — |  | — |  |  | $29.1 |
U.S. Mid-cap Growth | 21.2 |  | — |  | — |  | 21.2 |
U.S. Small-cap | 12.9 |  | — |  | — |  | 12.9 |
International | 30.4 |  | — |  | — |  | 30.4 |
Fixed Income Securities: |  |  |  |  |  |  |  |
Mutual Funds | 49.6 |  | — |  | — |  | 49.6 |
Debt Securities | — |  |  | $4.0 |  | — |  | 4.0 |
Cash and Cash Equivalents | 0.6 |  | — |  | — |  | 0.6 |
Private Equity Funds | — |  | — |  |  | $6.5 |  | 6.5 |
Total Fair Value of Assets |  | $143.8 |  |  | $4.0 |  |  | $6.5 |  |  | $154.3 |
(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, 2017 |  | $8.2 |
Actual Return on Plan Assets | 0.9 |
Purchases, Sales, and Settlements – Net | (2.6 | )
Balance as of December 31, 2018 |  | $6.5 |
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 |

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- Definition Tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period. + References No definition available. + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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