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BENEFIT PLANS: (Tables) | 9 Months Ended
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Sep. 30, 2022
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 nine-month periods ended September 30, 2022 and 2021 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2022 |  | 2021
Service cost | ​ | $ | 1.3 | ​ | $ | 1.1
Interest cost | ​ |  | 1.7 | ​ |  | 1.2
Expected return on plan assets | ​ |  | (2.9) | ​ |  | (2.6)
Amortization of prior service cost / (credit) | ​ |  | 0.1 | ​ |  | 0.1
Amortization of net loss/(gain) | ​ |  | 0.3 | ​ |  | 0.2
Net periodic benefit cost | ​ | $ | 0.5 | ​ | $ | (0.0)
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 nine-month periods ended September 30, 2022 and 2021 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2022 |  | 2021
Interest cost | ​ | $ | 1.2 | ​ | $ | 1.3
Amortization of net loss (gain) | ​ |  | 0.1 | ​ |  | 0.1
Amortization of prior service cost/ (credit) | ​ |  | (*) | ​ |  | (*)
Net periodic benefit cost | ​ | $ | 1.3 | ​ | $ | 1.4

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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