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v3.25.2

Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | $ 0.6 | $ 0.7 | $ 1.3 | $ 1.3
Interest cost | 3.5 | 3.2 | 6.8 | 6.7
Expected return on plan assets | (4.0) | (4.1) | (7.9) | (7.9)
Amortization of prior service benefit (cost) | 0.0 | 0.0 | 0.1 | 0.1
Amortization of net loss | 1.5 | 1.3 | 2.9 | 3.0
Net periodic benefit cost | 1.6 | 1.1 | 3.2 | 3.2
Other Postretirement Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | 0.1 | 0.1 | 0.1 | 0.1
Interest cost | 0.9 | 0.9 | 1.9 | 1.9
Amortization of prior service benefit (cost) | 0.0 | (0.1) | 0.0 | (0.1)
Amortization of net loss | 0.1 | 0.3 | 0.3 | 0.3
Net periodic benefit cost | $ 1.1 | $ 1.2 | $ 2.3 | $ 2.2

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