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Property, Plant, and Equipment, net (Notes)
6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net
6. Property, Plant, and Equipment, net

The following table details the major components of property, plant, and equipment, net:
(in millions)
June 30, 2018
 
December 31, 2017
Land
$
7.4

 
$
7.7

Buildings and improvements
103.1

 
103.2

Machinery, equipment, and other
485.5

 
441.1

Subtotal
596.0

 
552.0

Less accumulated depreciation
(390.9
)
 
(369.0
)
Total
$
205.1

 
$
183.0



Depreciation expense totaled $11.5 million and $11.6 million for the three months ended June 30, 2018 and 2017, respectively. For the six months ended June 30, 2018 and 2017, depreciation expense totaled $23.4 million and $23.3 million, respectively.

During the three months ended June 30, 2017, the Company recorded a $5.1 million impairment charge on fixed assets. See Note 4. Impairments for more information.