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Benefit Plans | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Benefit Plans | Benefit Plans Components of net periodic benefit expense for our pension plans for the three and six months ended June 30, 2025 and 2024 were as follows:
| Three months ended |  | Six months ended
In millions | June 30, 2025 | June 30, 2024 |  | June 30, 2025 | June 30, 2024
Service cost | $ | 0.3 |  | $ | 0.4 |  |  | $ | 0.6 |  | $ | 0.8 |
Interest cost | 1.0 |  | 1.0 |  |  | 2.0 |  | 2.0 |
Expected return on plan assets | (0.2) |  | (0.1) |  |  | (0.4) |  | (0.2) |
Net periodic benefit expense | $ | 1.1 |  | $ | 1.3 |  |  | $ | 2.2 |  | $ | 2.6 |
Components of net periodic benefit expense for our other post-retirement plans for the three and six months ended June 30, 2025 and 2024 were not material

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