Pension and Postretirement Plans (Tables)

6 Months Ended

Jun. 30, 2019

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Schedule of Pension and Postretirement Costs (Benefits)

For the three and six months ended June 30, 2019 and 2018, pension and postretirement costs (benefits) were as follows:

	Three Months Ended June 30,
	2019			2018			2019			2018
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	—		$	—		$	0.1		$	—
Other components of pension and postretirement benefit plans expense:
Interest cost on projected benefit obligation		6.0			4.1			1.3			0.8
Expected return on plan assets		(7.5	)		(6.2	)		—			—
Amortization of:
Prior service benefit		—			—			(0.7	)		(0.8	)
Actuarial loss		3.4			4.2			0.5			1.1
Total amortization		3.4			4.2			(0.2	)		0.3
Pension / postretirement costs	$	1.9		$	2.1		$	1.2		$	1.1

	Six Months Ended June 30,
	2019			2018			2019			2018
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	—		$	—		$	0.3		$	0.1
Other components of pension and postretirement benefit plans expense:
Interest cost on projected benefit obligation		12.0			8.3			2.5			1.6
Expected return on plan assets		(15.3	)		(12.4	)		—			—
Amortization of:
Prior service benefit		—			—			(1.3	)		(1.6	)
Actuarial loss		6.8			8.5			0.9			2.1
Total amortization		6.8			8.5			(0.4	)		0.5
Pension / postretirement costs	$	3.5		$	4.4		$	2.4		$	2.2