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Property and Equipment
12 Months Ended
Dec. 31, 2021
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)20212020
Land$13.9 $15.6 
Building and land improvements154.3 148.3 
Construction in progress7.6 3.1 
Manufacturing and office equipment239.2 238.7 
Aviation equipment4.7 4.7 
Less accumulated depreciation(248.0)(237.6)
Total$171.7 $172.8 

Depreciation expense was $20.1 million, $20.8 million and $21.4 million for the years ended December 31, 2021, 2020 and 2019, respectively.