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Pension and Postretirement Benefit Costs (Tables)

6 Months Ended

Jun. 30, 2025

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Net periodic postretirement benefit credit included the following components:

			Three Months Ended June 30,												Six Months Ended June 30,
			2025						2024						2025						2024
			(Dollars in millions)
Service cost for benefits earned			$	0.1					$	0.1					$	0.2					$	0.2
Interest cost on accumulated postretirement benefit obligation			1.9						2.3						3.9						4.6
Expected return on plan assets			(0.1)						(0.1)						(0.2)						(0.2)
Amortization of prior service credit			(10.2)						(13.3)						(20.4)						(26.5)
Net periodic postretirement benefit credit			$	(8.3)					$	(11.0)					$	(16.5)					$	(21.9)

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- 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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