OTHER FINANCIAL STATEMENT DATA

The following provides additional information concerning selected balance sheet accounts:



	December 31,
(in millions)	2018		2017
Receivables
Trade	$	703.7	$	563.6
Non-trade	136.1		81.3
	839.8		644.9
Less allowance for doubtful accounts	1.3		2.3
	$	838.5	$	642.6
Inventories
Raw materials	$	147.5	$	37.8
Work in process	625.5		349.9
Finished goods	1,343.8		1,035.1
Final price deferred ^(a)	39.3		38.6
Operating materials and supplies	114.1		85.8
	$	2,270.2	$	1,547.2
Other current assets
Income and other taxes receivable	$	149.2	$	141.3
Prepaid expenses	86.8		69.0
Other	44.6		62.9
	$	280.6	$	273.2
Other assets
Restricted cash	$	15.8	$	32.6
MRO inventory	134.6		114.8
Marketable securities held in trust - restricted	632.3		628.0
Indemnification asset	30.7		—
Long-term receivable	91.7		—
Other	352.7		492.1
	$	1,257.8	$	1,267.5



	December 31,
(in millions)	2018		2017
Accrued liabilities
Accrued dividends	$	11.8	$	12.1
Payroll and employee benefits	217.5		159.5
Asset retirement obligations	136.3		98.1
Customer prepayments	199.8		140.4
Accrued income tax	65.5		1.4
Other	461.6		342.9
	$	1,092.5	$	754.4
Other noncurrent liabilities
Asset retirement obligations	$	1,023.8	$	761.2
Accrued pension and postretirement benefits	146.3		53.7
Unrecognized tax benefits	33.0		33.5
Other	255.6		119.4
	$	1,458.7	$	967.8

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(a)	Final price deferred is product that has shipped to customers, but the price has not yet been agreed upon.

Interest expense, net was comprised of the following in 2018, 2017 and 2016: