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v3.23.3

BENEFIT PLANS: (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2023 USD ($) plan | Sep. 30, 2022 USD ($)
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 | $ 1.6 | $ 1.3
Interest cost | 2.6 | 1.7
Expected return on plan assets | (4.2) | (2.9)
Amortization of prior service cost / (credit) | 0.1 | 0.1
Amortization of net loss (gain) | 0.3 | 0.3
Net periodic benefit cost | 0.4 | 0.5
Post-retirement Health care plans |  |
Defined benefit plan, net periodic benefit costs |  |
Interest cost | 1.6 | 1.2
Amortization of net loss (gain) |  | 0.1
Net periodic benefit cost | $ 1.6 | 1.3
Post-retirement Health care plans | Maximum |  |
Defined benefit plan, net periodic benefit costs |  |
Amortization of prior service cost / (credit) |  | $ 0.1

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