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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment

The components of property, plant and equipment at December 31 were as follows:
 
2019
 
2018
Land
$
2.2

 
$
2.2

Buildings
84.7

 
76.7

Machinery and other equipment
218.1

 
218.0

Computer equipment
96.4

 
79.4

Software
73.3

 
64.4

 
474.7

 
440.7

Accumulated depreciation
(334.8
)
 
(312.0
)
 
$
139.9

 
$
128.7



Depreciation and amortization expense related to property, plant and equipment was $49.2, $49.5 and $49.5 for the years ended December 31, 2019, 2018 and 2017, respectively.