Pension and Postretirement Plans (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits, Description [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

For the three and nine months ended September 30, 2018 and 2017, pension and postretirement benefit costs (benefits) were as follows:

	Three Months Ended September 30,
	2018			2017			2018			2017
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	—		$	—		$	0.1		$	0.1
Other components of pension and postretirement benefit plans expense:
Interest cost on projected benefit obligation	4.2			4.9			0.8			0.8
Expected return on plan assets	(6.2		)	(6.5		)	—			—
Amortization of:
Prior service benefit	—			—			(0.7		)	(1.2		)
Actuarial loss	4.2			4.3			1.0			1.2
Total amortization	4.2			4.3			0.3			—
Pension / postretirement costs	$	2.2		$	2.7		$	1.2		$	0.9

	Nine Months Ended September 30,
	2018			2017			2018			2017
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	—		$	—		$	0.2		$	0.2
Other components of pension and postretirement benefit plans expense:
Interest cost on projected benefit obligation	12.5			14.6			2.4			2.4
Expected return on plan assets	(18.6		)	(19.5		)	—			—
Amortization of:
Prior service benefit	—			—			(2.3		)	(3.4		)
Actuarial loss	12.7			13.1			3.1			3.5
Total amortization	12.7			13.1			0.8			0.1
Pension / postretirement costs	$	6.6		$	8.2		$	3.4		$	2.7

The following provides the components of benefit costs (income) for the applicable periods (dollars in thousands):

	Three Months Ended September 30, 2018
(dollars in millions)	Pension Benefits			Postretirement and Other Benefits
Service cost	$	—		$	0.2
Other components of pension and postretirement benefit plans expense:
Interest cost on projected benefit obligation	1.7			0.5
Expected return on plan assets	(2.5		)	—
Pension / postretirement costs	$	(0.8	)	$	0.7

Schedule of Assumptions Used [Table Text Block]

The following are the weighted-average assumptions used in accounting for and measuring the projected benefit obligations as of the acquisition date:

	Pension Benefits		Postretirement and Other Benefits
	2018		2018
Discount rate	4.14	%	4.22	%

Schedule of Health Care Cost Trend Rates [Table Text Block]

The assumed healthcare cost trend rate used to measure the postretirement health benefit obligation as of the acquisition date is shown below:

	2018
Healthcare cost trend	7.0	%
Rate to which the cost trend is assumed to decline (ultimate trend rate)	5.0	%
Year the rates reach the ultimate trend rate	2026