Property, Plant and Equipment—Net

Property, plant and equipment—net consisted of the following:



	December 31,
	2017		2016
	(in millions)
Land	$	1.4	$	1.4
Buildings and improvements	16.9		16.7
Machinery and equipment	568.3		562.3
Construction in progress	41.1		21.9
Property, plant and equipment	627.7		602.3
Less: Accumulated depreciation and amortization	337.5		301.0
Property, plant and equipment—net	$	290.2	$	301.3

Property, plant and equipment used to produce nitrogen fertilizer products are subject to the Services and Offtake Agreement with an affiliate of the General Partner, which is accounted for as an operating lease. See Note 10—Related Party Transactions for additional information.

Additions to property, plant and equipment included in our consolidated statements of cash flows represents cash outflows for capital expenditures; therefore, it does not include the net increase (decrease) in amounts accrued for capital expenditures, which were $0.6 million, $1.8 million and $(2.2) million for the years ended December 31, 2017, 2016 and 2015, respectively.

Losses on the disposal of certain machinery and equipment were zero, $0.1 million and $2.0 million for the years ended December 31, 2017, 2016 and 2015, respectively, and are included in other general and administrative expenses in our consolidated statements of operations.

Plant turnarounds—Scheduled inspections, replacements and overhauls of machinery and equipment at our continuous process manufacturing facility are referred to as plant turnarounds. The expenditures related to turnarounds are capitalized in property, plant and equipment when incurred. The following is a summary of capitalized plant turnaround costs:



	Year ended December 31,
	2017			2016			2015
	(in millions)
Net capitalized turnaround costs:
Beginning balance	$	26.6		$	37.8		$	16.7
Additions	2.3			4.9			33.6
Depreciation	(14.2		)	(16.1		)	(12.5		)
Ending balance	$	14.7		$	26.6		$	37.8

Scheduled replacements and overhauls of machinery and equipment include the dismantling, repair or replacement and installation of various components including piping, valves, motors, turbines, pumps, compressors, heat exchangers and the replacement of catalyst when a full plant shutdown occurs. Scheduled inspections are also conducted during full plant shutdowns, including required safety inspections which entail the disassembly of various components such as steam boilers, pressure vessels and other equipment requiring safety certifications. Internal employee costs and overhead are not considered turnaround costs and are not capitalized.