Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)

6 Months Ended

Jun. 30, 2021

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

The components of Pension Income for the Pension Plan for the six and three months ended June 30, 2021 and 2020 were:

	Six Months Ended				Three Months Ended
(Dollars in Millions)	Jun 30, 2021		Jun 30, 2020		Jun 30, 2021		Jun 30, 2020
Interest Cost on Projected Benefit Obligation	$	3.5	$	9.0	$	1.7	$	4.5
Expected Return on Plan Assets	(4.7)		(14.7)		(2.4)		(7.4)
Amortization of Net Actuarial Loss	1.5		3.0		0.8		1.5
Total Pension (Benefit) Expense	$	0.3	$	(2.7)	$	0.1	$	(1.4)

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 six and three months ended June 30, 2021 and 2020 were:

	Six Months Ended				Three Months Ended
(Dollars in Millions)	Jun 30, 2021		Jun 30, 2020		Jun 30, 2021		Jun 30, 2020
Service Cost	$	0.1	$	0.1	$	—	$	—
Interest Cost on Accumulated Postretirement Benefit Obligation	0.1		0.2		0.1		0.1
Amortization of Prior Service Credit	(0.7)		(0.7)		(0.4)		(0.4)
Amortization of Net Gain	(0.7)		(1.0)		(0.3)		(0.5)
Total OPEB (Benefit) Expense	$	(1.2)	$	(1.4)	$	(0.6)	$	(0.8)