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Property, Plant and Equipment, Net
 6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net PROPERTY, PLANT AND EQUIPMENT, NET
 June 30, 2021December 31, 2020
Property, plant and equipment$2,350.3 $2,317.9 
Accumulated depreciation(1,167.0)(1,123.4)
Property, plant, and equipment, net$1,183.3 $1,194.5 
Depreciation expense amounted to $32.9 million, $64.8 million, $31.7 million and $73.3 million for the three and six months ended June 30, 2021 and 2020, respectively.
During May 2021, approximately $55.0 million of capitalized project costs related to an enterprise resource planning system previously classified as construction in progress were placed in service and depreciation was initiated. The majority of the costs will be depreciated over a 15 year useful life.