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Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Components of inventories
The components of inventories at June 30, 2019 and December 31, 2018 were as follows:
 
June 30,
2019
December 31,
2018
Manufacturing supplies
$
33.5

$
32.4

Raw materials
107.3

102.4

Work in process
294.9

287.7

Finished products
451.6

452.7

     Subtotal
887.3

875.2

Allowance for obsolete and surplus inventory
(43.5
)
(39.5
)
     Total Inventories, net
$
843.8

$
835.7