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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
Property, plant and equipment – net consist of the following (in millions):
December 31,
 20212020
Property$53.1 $43.6 
Plant284.4 250.1 
Equipment402.4 390.2 
Leasehold improvements50.0 49.9 
Construction in progress26.9 31.1 
Property, plant and equipment – gross816.8 764.9 
Less: Accumulated depreciation(387.2)(358.3)
Property, plant and equipment – net$429.6 $406.6 

Depreciation expense was $44.3 million, $42.3 million and $39.6 million for the years ended December 31, 2021, 2020 and 2019, respectively.