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BENEFIT PLANS: (Tables) | 6 Months Ended
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Jun. 30, 2026
Post retirement defined benefit plans |
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 periods ended June 30, 2026 and 2025 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended
​ | ​ | June 30,
(in millions) | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
Service cost | ​ | $ | 1.6 | ​ | $ | 1.2
Interest cost | ​ |  | 2.0 | ​ |  | 1.9
Expected return on plan assets | ​ |  | (4.7) | ​ |  | (3.6)
Amortization of prior service cost / (credit) | ​ |  | 0.1 | ​ |  | 0.1
Amortization of net loss/(gain) | ​ |  | (0.6) | ​ |  | 0.1
Net periodic (benefit) cost | ​ | $ | (1.6) | ​ | $ | (0.3)
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 periods ended June 30, 2026 and 2025 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
(in millions) | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
Interest cost | ​ | $ | 1.2 | ​ | $ | 1.0
Amortization of net loss (gain) | ​ |  | — | ​ |  | —
Net periodic cost | ​ | $ | 1.2 | ​ | $ | 1.0
​

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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