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Inventories
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories:
     
The components of inventories are as follows (in millions):
 
As of June 30, 2018
 
As of December 31, 2017
Finished goods
$
365.3

 
$
331.9

Work in process
6.4

 
5.5

Raw materials and parts
221.0

 
199.2

Subtotal
592.7

 
536.6

Excess of current cost over last-in, first-out cost
(52.5
)
 
(52.4
)
Total inventories, net
$
540.2

 
$
484.2