Property, Plant and Equipment

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

7. Property, Plant and Equipment

Property, plant and equipment consisted of the following (in millions):

	As of December 31,
	2019			2018
Land	$	27.6		$	28.0
Building and equipment		2,007.0			1,885.6
Capitalized software costs		482.4			425.8
Instruments		3,250.5			2,950.5
Construction in progress		149.3			147.2
		5,916.8			5,437.1
Accumulated depreciation		(3,839.4	)		(3,421.7	)
Property, plant and equipment, net	$	2,077.4		$	2,015.4

Depreciation expense was $421.8 million, $442.6 million and $454.1 million for the years ended December 31, 2019, 2018 and 2017, respectively.

We had $39.8 million and $49.3 million of property, plant and equipment included in accounts payable as of December 31, 2019 and 2018, respectively.