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Inventories (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Components of inventories
The components of inventories are as follows (in millions):
 
As of June 30, 2016
 
As of December 31, 2015
Finished goods
$
360.4

 
$
300.0

Work in process
6.8

 
4.2

Raw materials and parts
201.9

 
178.3

Subtotal
569.1

 
482.5

Excess of current cost over last-in, first-out cost
(63.4
)
 
(63.7
)
Total inventories, net
$
505.7

 
$
418.8