Defined Benefit Pension Plans (Tables)

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [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	2017			2016
Service cost	$	1.4		$	1.2
Interest cost	3.2			3.3
Expected return on plan assets	(3.3		)	(3.3		)
Amortization of prior service cost 1	0.2			0.1
Amortization of net loss 1	1.4			1.4
Net periodic pension cost	$	2.9		$	2.7