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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in Plan Assets |  |  |
Non-Current Liabilities | $ (118.2) | $ (160.8) |
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated Benefit Obligation | 701.7 | 729.5 |
Change in Benefit Obligation [Roll Forward] |  |  |
Obligation, Beginning of Year | 746.3 | 739.7 |
Service Cost | 6.6 | 6.5 | $ 9.3
Interest Cost | 38.6 | 40.5 | 27.2
Actuarial (Gain) Loss | (17.1) | 13.9 |
Benefits Paid | (61.9) | (60.9) |
Participant Contributions | 7.0 | 6.6 |
Obligation, End of Year | 719.5 | 746.3 | 739.7
Change in Plan Assets |  |  |
Fair Value, Beginning of Year | 589.0 | 568.6 |
Actual Return on Plan Assets | 43.0 | 55.1 |
Employer Contribution | 34.0 | 26.2 |
Benefits Paid | (61.9) | (60.9) |
Fair Value, End of Year | 604.1 | 589.0 | 568.6
Funded Status, End of Year | (115.4) | (157.3) |
Current Liabilities | (1.9) | (2.1) |
Non-Current Liabilities | (113.5) | (155.2) |
Postretirement Health and Life Obligation and Funded Status |  |  |
Change in Benefit Obligation [Roll Forward] |  |  |
Obligation, Beginning of Year | 73.9 | 110.4 |
Service Cost | 1.5 | 2.0 | 3.0
Interest Cost | 3.9 | 5.6 | 4.4
Actuarial (Gain) Loss | (1.9) | (9.3) |
Benefits Paid | (6.4) | (8.1) |
Participant Contributions | 1.4 | 2.4 |
Plan Amendments | 0.0 | (29.1) |
Obligation, End of Year | 72.4 | 73.9 | 110.4
Change in Plan Assets |  |  |
Fair Value, Beginning of Year | 173.8 | 162.6 |
Actual Return on Plan Assets | 14.8 | 20.3 |
Employer Contribution (Withdrawal) | (9.4) | (3.4) |
Participant Contributions | 1.4 | 2.4 |
Benefits Paid | (6.4) | (8.1) |
Fair Value, End of Year | 174.2 | 173.8 | $ 162.6
Funded Status, End of Year | 101.8 | 99.9 |
Non-Current Assets | 107.6 | 106.3 |
Current Liabilities | (0.2) | (0.2) |
Non-Current Liabilities | $ (5.6) | $ (6.2) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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