Original Cost
Estimated Useful Life
(years)
20252024
Land and land improvements
(1)
$19.3 $17.2 
Buildings and building improvements
15-30
52.4 47.3 
Machinery, tools and equipment
3-12
36.8 32.2 
Leasehold improvements (2)
10
10.5 3.5 
Computer equipment and software
3-10
34.6 18.4 
Furniture and fixtures
5-8
25.5 15.9 
Tooling
5
26.8 21.9 
Construction in progress19.7 13.5 
Less accumulated depreciation(81.0)(41.8)
Right-of use operating lease assets141.4 118.1 
Total property plant and equipment, net$286.0 $246.2 
(1)Estimated useful life for land and land improvements is perpetual and 15 years, respectively.
(2)The estimated useful life for leasehold improvements is the lesser of 10 years or the term of the lease.

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.