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Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Components of inventories The components of inventories at March 31, 2017 and December 31, 2016 were as follows:
 
March 31,
2017
December 31,
2016
Manufacturing supplies
$
27.8

$
28.2

Raw materials
58.8

54.9

Work in process
197.2

182.9

Finished products
305.9

308.8

Subtotal
589.7

574.8

Allowance for obsolete and surplus inventory
(23.5
)
(21.1
)
Total Inventories, net
$
566.2

$
553.7