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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2023
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,
 20232022
Property$75.1 $40.2 
Plant302.4 246.8 
Equipment492.3 418.9 
Leasehold improvements51.8 49.9 
Construction in progress73.4 92.9 
Property, plant and equipment – gross995.0 848.7 
Less: Accumulated depreciation(425.2)(383.1)
Property, plant and equipment – net$569.8 $465.6 

Depreciation expense was $51.7 million, $42.4 million and $44.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.