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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
A summary of changes in property, plant and equipment follows (in millions):
December 31,
2019
Additions / (Depreciation)December 31,
2020
Land
$1.2 $— $1.2 
Buildings and leasehold improvements2.5 1.4 3.9 
Machinery and equipment
1.1 0.3 1.4 
Other
1.1 — 1.1 
Property, plant and equipment, gross
5.9 1.7 7.6 
Accumulated depreciation
(2.2)(0.5)(2.7)
Property, plant and equipment, net
$3.7 $1.2 $4.9