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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Inventories [Abstract]  
Inventories
Inventories as of September 30, 2018 and December 31, 2017 consisted of the following.

  
September 30,
2018
 
 
December 31,
2017
 
Raw materials, including parts and subassemblies
 
$
368.1
  
$
362.6
 
Work-in-process
  
84.6
   
57.9
 
Finished goods
  
84.0
   
60.6
 
   
536.7
   
481.1
 
Excess of LIFO costs over FIFO costs
  
13.4
   
13.4
 
Inventories
 
$
550.1
  
$
494.5