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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Inventories) (Table)
 12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following (in millions):
 
December 31, 2019
 
December 31, 2018
 
Titled
Inventory
 
Supply & Offtake
Agreements (1)
 
Total
 
Titled
Inventory
 
Supply & Offtake
Agreements (1)
 
Total
Raw materials
$
48.3

 
$
11.6

 
$
59.9

 
$
30.2

 
$
22.2

 
$
52.4

Work in process
35.0

 
29.1

 
64.1

 
39.7

 
19.2

 
58.9

Finished goods
124.8

 
43.8

 
168.6

 
128.9

 
43.9

 
172.8

 
$
208.1

 
$
84.5

 
$
292.6

 
$
198.8

 
$
85.3

 
$
284.1


 
(1) 
Amounts represent LIFO value and do not necessarily represent the value at which the inventory was sold. Please read Note 9 - “Inventory Financing Agreements” for further information