Defined Benefit Pension Plans (Tables)

9 Months Ended

Sep. 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						Nine Months Ended
	September 30,						September 30,
Dollar amounts in millions	2018			2017			2018			2017
Service cost	$	1.2		$	1.4		$	3.4		$	4.1
Other components of net periodic pension cost:
Interest cost	2.9			3.3			8.6			9.7
Expected return on plan assets	(3.3		)	(3.3		)	(10.1		)	(9.8		)
Amortization of prior service cost 1	0.1			0.2			0.3			0.6
Amortization of net loss 1	1.5			1.4			4.7			4.2
Net periodic pension cost	$	2.4		$	3.0		$	6.9		$	8.8
Net periodic pension cost included in cost of sales	$	0.8		$	0.9		$	2.1		$	2.7
Net periodic pension cost included in selling, general, and administrative expenses	0.4			0.5			1.3			1.4
Net periodic pension cost included in other non-operating items	1.2			1.6			3.5			4.7
	$	2.4		$	3.0		$	6.9		$	8.8