Property, Plant and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

9. Property, Plant and Equipment, Net

The components of net property, plant and equipment were as follows:

	December 31,
(in millions)	2018			2017
Land and improvements	$	25.2		$	28.0
Buildings and improvements to leaseholds	144.2			152.6
Machinery and equipment	440.7			453.5
Construction in progress	8.6			11.1
	618.7			645.2
Less: accumulated depreciation	(355.0		)	(366.7		)
Property, plant and equipment, net(1)	$	263.7		$	278.5

(1) Net property, plant and equipment as of December 31, 2018 and 2017 contained $51.9 million and $42.1 million, respectively of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Amortization expense for software was $8.2 million, $7.1 million and $7.0 million for the years ended December 31, 2018, 2017 and 2016, respectively.