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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Components of inventories The components of inventories at June 30, 2017 and December 31, 2016 were as follows:
 
June 30,
2017
December 31,
2016
Manufacturing supplies
$
28.9

$
28.2

Raw materials
71.1

54.9

Work in process
214.5

182.9

Finished products
331.9

308.8

Subtotal
$
646.4

$
574.8

Allowance for obsolete and surplus inventory
(29.4
)
(21.1
)
Total Inventories, net
$
617.0

$
553.7