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Pension and Other Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of net periodic pension and retiree medical (income) loss were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Interest cost | $ | 7.8 |  |  | $ | 7.4 |  |  | $ | 23.2 |  |  | $ | 22.2 |
Expected return on plan assets | (7.4) |  |  | (7.9) |  |  | (21.9) |  |  | (23.7) |
Amortization of net gain | (0.2) |  |  | (0.1) |  |  | (0.6) |  |  | (0.5) |
Net periodic pension and retiree medical (income) loss (1) | $ | 0.2 |  |  | $ | (0.6) |  |  | $ | 0.7 |  |  | $ | (2.0) |
(1)Included in Other, net in our Condensed Consolidated Statements of Operations.

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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