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Property, Plant and Equipment - Components of property, plant and equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment      
Total cost $ 789.6 $ 846.3  
Less accumulated depreciation (480.8) (435.6)  
Property, plant and equipment-net 308.8 410.7  
Asset impairment expense 96.9 15.3 $ 0.0
Land      
Property, Plant and Equipment      
Total cost 23.6 23.7  
Building and improvements      
Property, Plant and Equipment      
Total cost 225.0 218.7  
Machinery, equipment and tooling      
Property, Plant and Equipment      
Total cost 292.6 274.4  
Furniture and fixtures      
Property, Plant and Equipment      
Total cost 16.7 16.6  
Computer hardware and software      
Property, Plant and Equipment      
Total cost 126.0 132.4  
Rental cranes      
Property, Plant and Equipment      
Total cost 89.0 99.5  
Property, plant and equipment-net 57.9 69.4  
Construction in progress      
Property, Plant and Equipment      
Total cost $ 16.7 $ 81.0