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Inventories, net (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories, net are comprised of:
In millions
June 30, 2017
 
December 31, 2016
Raw materials
$
41.4

 
$
50.8

Production materials, stores and supplies
12.4

 
12.0

Finished and in-process goods
110.8

 
109.8

Subtotal
164.6

 
172.6

Less: excess of cost over LIFO cost
(10.0
)
 
(21.4
)
Inventories, net
$
154.6

 
$
151.2