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v3.26.1

Other Postretirement Benefit Plans (Details) - Postretirement Plan - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Components of net periodic benefit credit: |  |  |  |
Interest cost | $ 0.4 | $ 0.4 | $ 0.8 | $ 0.9
Amortization of prior service credit | (2.1) | (2.0) | (4.1) | (4.1)
Net periodic benefit cost | $ (1.7) | $ (1.6) | $ (3.3) | $ (3.2)

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