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BENEFIT PLANS: (Tables) | 6 Months Ended
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Jun. 30, 2024
Post retirement defined benefit plans and defined contribution plan |
Components of net periodic benefit costs |
Schedule of the components of net periodic benefit costs | The components of net periodic benefit costs for the six-month period ended June 30, 2024 and 2023 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2024 |  | 2023
Service cost | ​ | $ | 1.3 | ​ | $ | 1.0
Interest cost | ​ |  | 2.0 | ​ |  | 1.7
Expected return on plan assets | ​ |  | (3.2) | ​ |  | (2.7)
Amortization of prior service cost / (credit) | ​ |  | 0.2 | ​ |  | 0.2
Amortization of net loss/(gain) | ​ |  | — | ​ |  | —
Net periodic benefit cost | ​ | $ | 0.3 | ​ | $ | 0.2
Post-retirement health care plans |
Components of net periodic benefit costs |
Schedule of the components of net periodic benefit costs | The components of net periodic benefit cost for the six-month period ended June 30, 2024 and 2023 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2024 |  | 2023
Interest cost | ​ | $ | 1.1 | ​ | $ | 1.0
Amortization of net loss (gain) | ​ |  | — | ​ |  | —
Amortization of prior service cost/ (credit) | ​ |  | — | ​ |  | —
Net periodic benefit cost | ​ | $ | 1.1 | ​ | $ | 1.0
​

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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