Defined Benefit Pension Plans (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The net periodic pension cost included the following components:

	Quarter Ended June 30,						Six Months Ended June 30,
Dollar amounts in millions	2018			2017			2018			2017
Service cost	$	1.1		$	1.4		$	2.2		$	2.7
Other components of net periodic pension cost:
Interest cost	2.9			3.3			5.8			6.5
Expected return on plan assets	(3.3		)	(3.3		)	(6.7		)	(6.5		)
Amortization of prior service cost 1	0.1			0.2			0.2			0.4
Amortization of net loss 1	1.5			1.4			3.1			2.8
Net periodic pension cost	$	2.3		$	3.0		$	4.6		$	5.9
Net periodic pension cost included in cost of sales	$	0.6		$	0.9		$	1.3		$	1.7
Net periodic pension cost included in selling, general, and administrative expenses	0.5			0.5			0.9			1.0
Net periodic pension cost included in other non-operating items	1.2			1.6			2.4			3.2
	$	2.3		$	3.0		$	4.6		$	5.9