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Property and Equipment
 12 Months Ended
Dec. 30, 2023
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment (which are carried at cost) as of 2023 and 2022 year end are as follows: 
(Amounts in millions)20232022
Land$34.5 $32.6 
Buildings and improvements452.8 434.7 
Machinery, equipment and computer software1,083.1 1,069.3 
Property and equipment – gross1,570.4 1,536.6 
Accumulated depreciation and amortization(1,031.1)(1,024.0)
Property and equipment – net$539.3 $512.6 

The estimated service lives of property and equipment are principally as follows: 

Buildings and improvements  
3 to 50 years
Machinery, equipment and computer software  
2 to 15 years
Depreciation expense was $72.2 million, $71.5 million and $75.6 million in 2023, 2022 and 2021, respectively.