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Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost (Credit) | The components of the net periodic benefit cost (credit) for our retirement plans were as follows:
|  | Defined Benefit Pension Plan |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Service cost |  | $ | 4.0 |  |  | $ | 4.2 |  |  | $ | 11.4 |  |  | $ | 12.3 |
Interest cost |  |  | 5.2 |  |  |  | 4.8 |  |  |  | 14.9 |  |  |  | 14.4 |
Expected return on assets |  |  | (5.4 | ) |  |  | (4.8 | ) |  |  | (15.4 | ) |  |  | (14.1 | )
Net (gain) loss |  |  | — |  |  |  | (0.3 | ) |  |  | 0.2 |  |  |  | (1.1 | )
Prior service cost |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.5 |  |  |  | 0.5 |
Curtailments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1.3 | )
Total benefit cost |  | $ | 4.0 |  |  | $ | 4.1 |  |  | $ | 11.6 |  |  | $ | 10.7 |
|  | Retiree Health Care Plan |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Interest cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | 0.3 |
Prior service credit |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.6 | ) |  |  | (0.6 | )
Total benefit credit |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (0.3 | ) |  | $ | (0.3 | )

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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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