Defined Benefit Pension Plans (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The net periodic pension cost included the following components:

	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Service cost	$	1.1		$	1.4
Other components of net periodic pension cost:
Interest cost	2.9			3.2
Expected return on plan assets	(3.4		)	(3.3		)
Amortization of prior service cost 1	0.1			0.2
Amortization of net loss 1	1.6			1.4
Net periodic pension cost	$	2.3		$	2.9
Net periodic pension cost included in cost of sales	$	0.7		$	0.9
Net periodic pension cost included in selling, general, and administrative expenses	0.4			0.4
Net periodic pension cost included in other non-operating items	1.2			1.6
	$	2.3		$	2.9