Pension and Postretirement Plans (Tables)

9 Months Ended

Sep. 30, 2020

Compensation And Retirement Disclosure [Abstract]

Schedule of Pension and Postretirement Costs (Benefits)

For the three and nine months ended September 30, 2020 and 2019, pension and postretirement costs (benefits) were as follows:

	Three Months Ended September 30,
	2020			2019			2020			2019
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	—		$	—		$	0.1		$	0.2
Other components of pension and postretirement benefit plans expense:
Interest cost on projected benefit obligation		4.6			5.9			0.9			1.3
Expected return on plan assets		(7.1	)		(7.7	)		—			—
Amortization of:
Prior service benefit		—			—			(0.6	)		(0.6	)
Actuarial loss		4.5			3.5			0.3			0.4
Pension / postretirement costs	$	2.0		$	1.7		$	0.7		$	1.3

	Nine Months Ended September 30,
	2020			2019			2020			2019
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	—		$	—		$	0.3		$	0.5
Other components of pension and postretirement benefit plans expense:
Interest cost on projected benefit obligation		14.2			17.9			2.8			3.8
Expected return on plan assets		(21.6	)		(23.0	)		—			—
Amortization of:
Prior service benefit		—			—			(1.9	)		(1.9	)
Actuarial loss		13.5			10.3			0.9			1.3
Pension settlement charges		1.1			—			—			—
Pension / postretirement costs	$	7.2		$	5.2		$	2.1		$	3.7