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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT
A summary of changes in property, plant and equipment follows (in millions):
December 31,
2020		Additions / (Depreciation)December 31,
2021
Land
$1.2 $— $1.2 
Buildings and leasehold improvements3.9 0.7 4.6 
Machinery and equipment
1.4 — 1.4 
Other
1.1 — 1.1 
Property, plant and equipment, gross
7.6 0.7 8.3 
Accumulated depreciation
(2.7)(0.3)(3.0)
Property, plant and equipment, net
$4.9 $0.4 $5.3 

Depreciation expense was $0.6 million in 2021 and $0.5 million in 2020.