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Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost (Credit) | The components of the net periodic benefit cost (credit) for our plans were as follows:
|  | Defined Benefit Pension Plan |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 4.0 |  |  | $ | 3.9 |  |  | $ | 8.1 |  |  | $ | 7.7 |
Interest cost |  |  | 4.8 |  |  |  | 5.3 |  |  |  | 9.6 |  |  |  | 10.5 |
Expected return on assets |  |  | (4.6 | ) |  |  | (4.8 | ) |  |  | (9.3 | ) |  |  | (9.4 | )
Curtailments |  |  | (1.3 | ) |  |  | — |  |  |  | (1.3 | ) |  |  | — |
Net gain |  |  | (0.4 | ) |  |  | (0.8 | ) |  |  | (0.8 | ) |  |  | (1.7 | )
Prior service cost |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.3 |  |  |  | 0.3 |
Total benefit cost |  | $ | 2.6 |  |  | $ | 3.7 |  |  | $ | 6.6 |  |  | $ | 7.4 |
|  | Retiree Health Care Plan |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Interest cost |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.3 |
Prior service credit |  |  | (0.2 | ) |  |  | — |  |  |  | (0.4 | ) |  |  | — |
Net gain |  |  | — |  |  |  | (0.2 | ) |  |  | — |  |  |  | (0.4 | )
Total benefit credit |  | $ | (0.1 | ) |  | $ | — |  |  | $ | (0.2 | ) |  | $ | (0.1 | )

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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 -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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