OTHER ASSETS (Tables)

3 Months Ended

Mar. 31, 2018

Other Assets [Abstract]

Schedule of Other Assets

Included in other assets were the following:

	March 31, 2018		December 31, 2017		March 31, 2017
	($ in millions)
Investments in non-consolidated affiliates	$	29.0	$	28.5	$	27.2
Deferred debt issuance costs	2.4		2.5		3.0
Tax-related receivables	5.3		10.2		16.1
Derivative contracts	4.0		3.6		8.3
Supply contracts	1,127.7		1,137.1		560.4
Other	28.6		26.5		22.2
Other assets	$	1,197.0	$	1,208.4	$	637.2