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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment

11. Property, Plant and Equipment

Property, plant and equipment consisted of the following (in millions):

 

 

June 30,
2024

 

 

December 31,
2023

 

Land and land improvements

 

$

102.3

 

 

$

100.5

 

Buildings

 

 

500.9

 

 

 

478.3

 

Machinery and equipment

 

 

1,087.2

 

 

 

1,013.4

 

Software and related costs

 

 

225.4

 

 

 

222.0

 

Construction in progress

 

 

321.9

 

 

 

348.4

 

Property, plant and equipment, gross

 

 

2,237.7

 

 

 

2,162.6

 

Less accumulated depreciation

 

 

(1,132.1

)

 

 

(1,093.1

)

Property, plant and equipment, net

 

$

1,105.6

 

 

$

1,069.5

 

Depreciation expense was $27.2 million and $25.8 million for the three months ended June 30, 2024 and 2023, respectively, and $53.3 million and $49.1 million for the six months ended June 30, 2024 and 2023, respectively.