The following table shows the components of other assets reported on our balance sheets as of December 31 (in millions):



	2015		2014
Inventory	$	55.2	$	52.0
Office furniture, fixtures and other equipment, net of accumulated depreciation	31.8		34.1
Derivatives	12.7		11.5
Deferred financing costs	3.4		4.0
Assets held for sale	106.0		7.0
Other investments	4.2		6.0
Prepaid items	14.3		12.4
Prepaid pension	0.7		—
Other	84.1		84.4
	$	312.4	$	211.4

Assets held for sale increased at December 31, 2015 as a result of management's decision to exit the majority of our marine investments within the Portfolio Management segment. For additional information, see "Note 11. Asset Impairments."

The following table shows the components of other liabilities reported on our balance sheets as of December 31 (in millions):



	2015		2014
Accrued operating lease expense	$	19.3	$	43.4
Accrued pension and other post-retirement benefits	94.6		86.6
Deferred gains on sale-leasebacks	44.8		49.0
Unrecognized tax benefits	3.8		3.6
Environmental accruals	13.2		13.8
Deferred income	7.7		5.6
Derivatives	3.7		7.5
Other	33.5		36.6
	$	220.6	$	246.1

Accrued operating lease expense decreased at December 31, 2015 as a result of the purchase of railcars previously on operating leases during the year.