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PROPERTY, PLANT & EQUIPMENT
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT & EQUIPMENT PROPERTY, PLANT & EQUIPMENT
The major classes of depreciable assets are as follows:
 December 31,
In millions20192018
Machinery and equipment$1,363.8  $749.8  
Buildings and improvements774.2  248.1  
Land and improvements78.0  38.7  
Property, plant and equipment2,216.0  1,036.6  
Less: accumulated depreciation(560.2) (472.8) 
Total$1,655.8  $563.8  
 The estimated useful lives of property, plant and equipment are as follows:
 Years
Land improvements10 to 20
Building and improvements20 to 40
Machinery and equipment3 to 15
 Depreciation expense was $157.8 million, $66.4 million, and $66.7 million for 2019, 2018 and 2017, respectively.