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PROPERTY, PLANT & EQUIPMENT
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT & EQUIPMENT PROPERTY, PLANT & EQUIPMENT
The major classes of depreciable assets are as follows:
 December 31,
In millions20202019
Machinery and equipment$1,474.6 $1,363.8 
Buildings and improvements801.1 774.2 
Land and improvements97.6 78.0 
Property, plant and equipment2,373.3 2,216.0 
Less: accumulated depreciation(771.7)(560.2)
Total$1,601.6 $1,655.8 
 The estimated useful lives of property, plant and equipment are as follows:
 Years
Land improvements
10 to 20
Building and improvements
20 to 40
Machinery and equipment
3 to 15
 Depreciation expense was $183.1 million, $157.8 million, and $66.4 million for 2020, 2019 and 2018, respectively.