Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Loss Contingencies by Contingency [Table Text Block]

maintain reserves for various contingent liabilities as follows:

	December 31,
Dollar amounts in millions	2017			2016
Environmental reserves	$	15.0		$	15.9
Other reserves	0.1			0.2
Total contingencies	15.1			16.1
Current portion	(3.4		)	(3.4		)
Long-term portion	$	11.7		$	12.7

Schedule of Environmental Loss Contingencies by Site [Table Text Block]

The activity in our reserve for estimated environmental loss contingency reserves for the last three years is summarized in the following table.

	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Beginning balance	$	15.9		$	16.6		$	13.6
Adjusted to expense (income) during the year	1.2			0.7			0.5
Adjusted to expense (income) through other operating credits and charges, net	—			—			3.2
Payments made	(2.1		)	(1.4		)	(0.7		)
Ending balance	$	15.0		$	15.9		$	16.6