Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)

9 Months Ended

Sep. 30, 2022

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

The components of Pension (Benefit) Expense for the Pension Plan for the nine and three months ended September 30, 2022 and 2021 were:

	Nine Months Ended				Three Months Ended
(Dollars in Millions)	Sep 30, 2022		Sep 30, 2021		Sep 30, 2022		Sep 30, 2021
Interest Cost on Projected Benefit Obligation	$	6.5	$	5.3	$	2.2	$	1.8
Expected Return on Plan Assets	(5.6)		(7.0)		(1.9)		(2.3)
Amortization of Prior Service Cost	0.5		—		0.2		—
Amortization of Net Actuarial Loss	1.3		2.2		0.4		0.7
Total Pension (Benefit) Expense	$	2.7	$	0.5	$	0.9	$	0.2

Postretirement Benefits Other than Pensions

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

The components of OPEB benefits for the OPEB Plans for the nine and three months ended September 30, 2022 and 2021 were:

	Nine Months Ended				Three Months Ended
(Dollars in Millions)	Sep 30, 2022		Sep 30, 2021		Sep 30, 2022		Sep 30, 2021
Service Cost	$	0.1	$	0.2	$	—	$	0.1
Interest Cost on Accumulated Postretirement Benefit Obligation	0.1		0.1		—		—
Amortization of Prior Service Credit	(1.0)		(1.0)		(0.3)		(0.3)
Amortization of Net Gain	(1.3)		(1.3)		(0.5)		(0.6)
Total OPEB (Benefit) Expense	$	(2.1)	$	(2.0)	$	(0.8)	$	(0.8)