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Property and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment at cost, less accumulated depreciation, is as follows:

December 31,
(in millions)20242023
Land$12.3 $12.7 
Building and land improvements158.8 149.1 
Construction in progress3.9 20.3 
Manufacturing and office equipment266.7 249.0 
Aviation equipment4.6 4.6 
Less accumulated depreciation(264.4)(248.1)
Total$181.9 $187.6 

Depreciation expense was $22.0 million, $20.1 million and $19.4 million for the years ended December 31, 2024, 2023 and 2022, respectively.