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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory [Abstract]  
Schedule of Inventory, Current [Table Text Block] The components of inventories at December 31, 2017 and 2016 were as follows:
 
2017
2016
Manufacturing supplies
$
29.0

$
28.2

Raw materials
90.4

54.9

Work in process
245.2

182.9

Finished products
404.3

308.8

Subtotal
$
768.9

$
574.8

Allowance for surplus and obsolete inventory
(30.0
)
(21.1
)
Total Inventories, net
$
738.9

$
553.7