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v3.21.2

BENEFIT PLANS: (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 USD ($) plan | Jun. 30, 2020 USD ($)
Benefit plans |  |
Number of noncontributory defined benefit pension plans | plan | 2 |
Maximum |  |
Defined benefit plan, net periodic benefit costs |  |
Amortization of net loss (gain) |  | $ (0.1)
Post retirement defined benefit plans and defined contribution plan |  |
Defined benefit plan, net periodic benefit costs |  |
Service cost | $ 0.7 | 0.7
Interest cost | 0.7 | 0.9
Expected return on plan assets | (1.7) | (1.4)
Amortization of prior service cost (credit) | 0.1 | 0.1
Amortization of net loss (gain) | 0.1 | 0.1
Net periodic benefit cost | (0.1) | 0.4
Post-retirement Health care plans |  |
Defined benefit plan, net periodic benefit costs |  |
Interest cost | 0.8 | 0.6
Amortization of net loss (gain) | 0.1 |
Net periodic benefit cost | 0.9 | 0.6
Post-retirement Health care plans | Maximum |  |
Defined benefit plan, net periodic benefit costs |  |
Amortization of prior service cost (credit) | $ 0.1 | $ 0.1

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