OTHER ASSETS

Included in other assets were the following:



	June 30, 2017		December 31, 2016		June 30, 2016
	($ in millions)
Investments in non-consolidated affiliates	$	27.7	$	26.7	$	25.6
Deferred debt issuance costs	2.8		2.6		2.9
Tax-related receivables	16.0		17.5		18.2
Interest rate swaps	4.7		7.7		3.7
Supply contracts	554.1		566.7		518.8
Other	20.3		23.2		19.4
Other assets	$	625.6	$	644.4	$	588.6

In connection with the Acquisition, Olin and TDCC entered into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin made upfront payments of $433.5 million on the Closing Date in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $416.1 million which will be amortized over the life of the contracts as ethylene is received. During 2016, one of the options to reserve additional future ethylene supply at producer economics was exercised by us and, accordingly, additional payments will be made to TDCC of approximately $209.4 million in 2017, which will increase the value of the long-term asset. On February 27, 2017, we exercised the remaining option to reserve additional future ethylene supply and, in connection with the exercise, we also secured a long-term customer arrangement. Consequently, additional payments will be made to TDCC of between $425 million and $465 million on or about the fourth quarter of 2020, which will increase the value of the long-term asset.

During 2016, Olin entered into arrangements to increase our supply of low cost electricity. In conjunction with these arrangements, Olin made payments of $175.7 million in 2016, including $85.0 million for the six months ended June 30, 2016. The payments made under these arrangements will be amortized over the life of the contracts as electrical power is received.

Amortization expense of $6.3 million and $4.4 million for the three months ended June 30, 2017 and 2016, respectively, and $12.6 million and $8.7 million for the six months ended June 30, 2017 and 2016, respectively, was recognized within cost of goods sold related to these supply contracts and is reflected in depreciation and amortization on the condensed statements of cash flows. The long-term supply contracts are monitored for impairment each reporting period.