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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT
At December 31, the major classes of property, plant and equipment were as follows:
In millions
 
2019
 
2018
Land
 
$
60.6

 
$
53.2

Buildings
 
921.2

 
870.7

Machinery and equipment
 
2,210.0

 
2,079.9

Software
 
847.9

 
831.4

 
 
4,039.7

 
3,835.2

Accumulated depreciation
 
(2,233.5
)
 
(2,104.4
)
Total
 
$
1,806.2

 
$
1,730.8


Depreciation expense for the years ended December 31, 2019, 2018 and 2017 was $221.2 million, $217.4 million and $217.3 million, which include amounts for software amortization of $25.3 million, $25.7 million and $28.6 million, respectively.