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Inventories (Tables)
 9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Components of inventories
The components of inventories at September 30, 2019 and December 31, 2018 were as follows:
 
September 30,
2019
December 31,
2018
Manufacturing supplies
$
31.9

$
32.4

Raw materials
102.4

102.4

Work in process
289.0

287.7

Finished products
426.5

452.7

     Subtotal
849.8

875.2

Allowance for obsolete and surplus inventory
(44.5
)
(39.5
)
     Total Inventories, net
$
805.3

$
835.7