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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Change in Plan Assets [Roll Forward] |  |  |  |
Non-Current Liabilities |  | $ (179.7) | $ (179.5) |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net Loss | [1] | 9.2 | 12.7 |
Change in Benefit Obligation [Roll Forward] |  |  |  |
Obligation, Beginning of Year |  | 148.2 | 167.6 |
Service Cost |  | 3.0 | 3.6 | $ 3.3
Interest Cost | [2] | 4.4 | 4.4 | 5.0
Actuarial (Gain) Loss | [3] | (38.7) | (19.7) |
Benefits Paid |  | (9.2) | (10.6) |
Participant Contributions |  | 2.7 | 2.9 |
Obligation, End of Year |  | 110.4 | 148.2 | 167.6
Change in Plan Assets [Roll Forward] |  |  |  |
Fair Value, Beginning of Year |  | 201.8 | 186.0 |
Actual Return on Plan Assets |  | (33.0) | 22.8 |
Employer Contribution |  | 0.3 | 0.7 |
Defined Benefit Plan Contributions by Plan Participants, Excluding Key Employees |  | 2.7 | 2.9 |
Benefits Paid |  | (9.2) | (10.6) |
Fair Value, End of Year |  | 162.6 | 201.8 | 186.0
Funded Status, End of Year |  | 52.2 | 53.6 |
Non-Current Assets |  | 58.8 | 64.8 |
Current Liabilities |  | (0.2) | (1.4) |
Non-Current Liabilities |  | (6.4) | (9.8) |
Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net Loss |  | (260.2) | (260.2) |
Accumulated Benefit Obligation |  | 724.5 | 875.5 |
Change in Benefit Obligation [Roll Forward] |  |  |  |
Obligation, Beginning of Year |  | 911.7 | 965.7 |
Service Cost |  | 9.3 | 11.0 | 10.7
Interest Cost | [4] | 27.2 | 24.6 | 27.9
Plan Amendments |  | 0.8 | 0.0 |
Actuarial (Gain) Loss | [5] | (160.6) | (39.0) |
Benefits Paid |  | (58.9) | (56.5) |
Participant Contributions |  | 10.2 | 7.3 |
Plan Curtailments |  | 0.0 | (1.4) |
Obligation, End of Year |  | 739.7 | 911.7 | 965.7
Change in Plan Assets [Roll Forward] |  |  |  |
Fair Value, Beginning of Year |  | 745.7 | 759.4 |
Actual Return on Plan Assets |  | (130.5) | 23.1 |
Employer Contribution | [6] | 12.3 | 19.7 |
Benefits Paid |  | (58.9) | (56.5) |
Fair Value, End of Year |  | 568.6 | 745.7 | $ 759.4
Funded Status, End of Year |  | (171.1) | (166.0) |
Current Liabilities |  | (2.1) | (2.1) |
Non-Current Liabilities |  | $ (169.0) | $ (163.9) |
[1] | Excludes gains, losses and contributions associated with irrevocable grantor trusts.
[2] | 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.
[3] | Actuarial gain was primarily the result of increases in discount rates in 2022 and 2021.
[4] | These components of net periodic pension cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.
[5] | Actuarial gain was primarily the result of increases in discount rates in 2022 and 2021.
[6] | Includes Participant Contributions noted above, any contributions made by the Company to pension plan trusts and any direct benefit payments made under certain plans.(c) Presented here net of amounts related to prepaid pension for SWL&P that are reclassified to Regulatory Assets on the Consolidated Balance Sheet.

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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