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v3.23.2

BENEFIT PLANS: (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 USD ($) plan | Jun. 30, 2022 USD ($)
Benefit plans |  |
Number of noncontributory defined benefit pension plans | plan | 2 |
Post retirement defined benefit plans and defined contribution plan |  |
Defined benefit plan, net periodic benefit costs |  |
Service cost | $ 1.0 | $ 0.9
Interest cost | 1.7 | 1.1
Expected return on plan assets | (2.7) | (1.9)
Amortization of prior service cost / (credit) |  | 0.1
Amortization of net loss (gain) | 0.2 | 0.3
Net periodic benefit cost | 0.2 | 0.5
Post-retirement Health care plans |  |
Defined benefit plan, net periodic benefit costs |  |
Interest cost | 1.0 | 0.8
Amortization of net loss (gain) |  | 0.1
Net periodic benefit cost | $ 1.0 | $ 0.9

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