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Pension and Postretirement Benefit Costs (Tables)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Net periodic pension credit included the following components:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2022						2021						2022						2021
			(Dollars in millions)
Service cost for benefits earned			$	0.1					$	—					$	0.1					$	0.1
Interest cost on projected benefit obligation			5.3						5.2						16.0						15.4
Expected return on plan assets			(6.0)						(5.8)						(17.9)						(17.2)
Net periodic pension credit			$	(0.6)					$	(0.6)					$	(1.8)					$	(1.7)

Net periodic postretirement benefit credit included the following components:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2022						2021						2022						2021
			(Dollars in millions)
Service cost for benefits earned			$	0.2					$	0.3					$	0.6					$	0.8
Interest cost on accumulated postretirement benefit obligation			1.7						2.9						5.2						8.7
Expected return on plan assets			(0.2)						(0.3)						(0.6)						(0.7)
Amortization of prior service credit			(13.4)						(11.0)						(40.3)						(33.0)
Net periodic postretirement benefit credit			$	(11.7)					$	(8.1)					$	(35.1)					$	(24.2)

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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