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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Components of inventories The components of inventories at June 30, 2018 and December 31, 2017 were as follows:
 
June 30,
2018
December 31,
2017
Manufacturing supplies
$
30.4

$
29.0

Raw materials
98.7

90.4

Work in process
264.9

245.2

Finished products
418.4

404.3

     Subtotal
812.4

768.9

Allowance for obsolete and surplus inventory
(35.0
)
(30.0
)
     Total Inventories, net
$
777.4

$
738.9