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Inventories
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories:
     
The components of inventories are as follows (in millions):
 
As of March 31, 2019
 
As of December 31, 2018
Finished goods
$
429.2

 
$
330.5

Work in process
5.4

 
10.0

Raw materials and parts
225.3

 
229.1

Subtotal
659.9

 
569.6

Excess of current cost over last-in, first-out cost
(59.8
)
 
(59.8
)
Total inventories, net
$
600.1

 
$
509.8