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BENEFIT PLANS: (Tables)

9 Months Ended

Sep. 30, 2025

Defined contribution plan and 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 nine-month periods ended September 30, 2025 and 2024 are as follows (in millions):

​

​	​	​	​	​	​	​
​	​	Nine months ended
​	​	September 30,
(in millions)		2025			2024
Service cost	​	$	1.9	​	$	1.9
Interest cost	​		2.8	​		2.8
Expected return on plan assets	​		(5.5)	​		(4.7)
Amortization of prior service cost / (credit)	​		0.1	​		0.2
Amortization of net loss/(gain)	​		0.1	​		0.3
Net periodic (benefit) cost	​	$	(0.6)	​	$	0.5

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, 2025 and 2024 are as follows (in millions):

​

​	​	​	​	​	​	​
​	​	Nine months ended September 30,
(in millions)		2025			2024
Interest cost	​	$	1.6	​	$	1.5
Amortization of net loss (gain)	​		—	​		—
Amortization of prior service cost/ (credit)	​		(*)	​		(*)
Net periodic benefit cost	​	$	1.6	​	$	1.5

(*) Less than $0.1 million.

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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.

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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

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