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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment – net consist of the following (in millions):
December 31,
 20202019
Property$43.6 $40.9 
Plant250.1 168.1 
Equipment390.2 358.3 
Leasehold improvements49.9 55.8 
Construction in progress31.1 101.1 
Property, plant and equipment – gross764.9 724.2 
Less: Accumulated depreciation(358.3)(334.8)
Property, plant and equipment – net$406.6 $389.4 

Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was $42.3 million, $39.6 million and $39.0 million, respectively. During 2020, the Company completed construction of a manufacturing facility in Watertown, South Dakota. Related assets were placed in service and transferred from construction in progress to plant and equipment.