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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment NOTE 6. PROPERTY, PLANT AND EQUIPMENT
The classes of property, plant and equipment as of December 31 are summarized as follows ($ in millions):
 
2018
 
2017
Land and improvements
$
63.1

 
$
64.9

Buildings and leasehold improvements
343.6

 
341.4

Machinery and equipment
1,059.2

 
1,028.5

Gross property, plant and equipment
1,465.9

 
1,434.8

Less: accumulated depreciation
(889.8
)
 
(824.4
)
Property, plant and equipment, net
$
576.1

 
$
610.4


No interest was capitalized related to capitalized expenditures in any period.