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BENEFIT PLANS: (Tables)

3 Months Ended

Mar. 31, 2023

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 three-month periods ended March 31, 2023 and 2022 are as follows (in millions):

​	​	​	​	​	​	​
​	​	Years ended
​	​	December 31,
(in millions)		2023			2022
Service cost	​	$	0.5	​	$	0.4
Interest cost	​		0.8	​		0.5
Expected return on plan assets	​		(1.3)	​		(1.0)
Amortization of net loss/(gain)	​		0.1	​		0.1
Net periodic benefit cost	​	$	0.1	​	$	—

​

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 three-month periods ended March 31, 2023 and 2022 are as follows (in millions):

​

​	​	​	​	​	​	​
(in millions)		2023			2022
Interest cost	​	$	0.5	​	$	0.4
Amortization of net loss (gain)	​		(*)	​		(*)
Amortization of prior service cost/ (credit)	​		(*)	​		(*)
Net periodic benefit cost	​	$	0.5	​	$	0.4

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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://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

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