Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2022 and 2021 were:

	Three Months Ended
(Dollars in Millions)	Mar 31, 2022		Mar 31, 2021
Interest Cost on Projected Benefit Obligation	$	2.2	$	1.8
Expected Return on Plan Assets	(1.9)		(2.3)
Amortization of Prior Service Cost	0.2		—
Amortization of Net Actuarial Loss	0.4		0.7
Total Pension (Benefit) Expense	$	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 three months ended March 31, 2022 and 2021 were:

	Three Months Ended
(Dollars in Millions)	Mar 31, 2022		Mar 31, 2021
Service Cost	$	0.1	$	0.1
Interest Cost on Accumulated Postretirement Benefit Obligation	—		—
Amortization of Prior Service Credit	(0.3)		(0.3)
Amortization of Net Gain	(0.4)		(0.4)
Total OPEB (Benefit) Expense	$	(0.6)	$	(0.6)