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Property, Plant and Equipment - Components of property, plant and equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment    
Total cost $ 762.6 $ 756.1
Less accumulated depreciation (460.8) (461.8)
Property, plant and equipment — net 301.8 294.3
Land    
Property, Plant and Equipment    
Total cost 19.6 20.3
Building and Improvements    
Property, Plant and Equipment    
Total cost 200.4 203.7
Machinery, Equipment and Tooling    
Property, Plant and Equipment    
Total cost 293.6 292.6
Furniture and Fixtures    
Property, Plant and Equipment    
Total cost 15.1 21.0
Computer Hardware and Software    
Property, Plant and Equipment    
Total cost 125.7 119.3
Rental Cranes    
Property, Plant and Equipment    
Total cost 94.4 90.2
Construction in Progress    
Property, Plant and Equipment    
Total cost $ 13.8 $ 9.0