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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Components of inventories The components of inventories at September 30, 2017 and December 31, 2016 were as follows:
 
September 30,
2017
December 31,
2016
Manufacturing supplies
$
29.5

$
28.2

Raw materials
85.7

54.9

Work in process
238.4

182.9

Finished products
367.4

308.8

Subtotal
$
721.0

$
574.8

Allowance for obsolete and surplus inventory
(33.5
)
(21.1
)
Total Inventories, net
$
687.5

$
553.7