Property, Plant and Equipment

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

8.Property, Plant and Equipment

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

	As of December 31,
	2023			2022
Land	$	18.9		$	19.2
Building and equipment		2,245.9			2,093.4
Capitalized software costs		552.2			518.2
Instruments		3,748.6			3,683.5
Construction in progress		200.6			144.1
		6,766.2			6,458.4
Accumulated depreciation		(4,705.8	)		(4,585.9	)
Property, plant and equipment, net	$	2,060.4		$	1,872.5

Depreciation expense was $390.2 million, $399.6 million and $408.1 million for the years ended December 31, 2023, 2022 and 2021, respectively.

We had $30.8 million and $17.0 million of property, plant and equipment included in accounts payable as of December 31, 2023 and 2022, respectively.