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Inventory (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventory are summarized as follows:
(In millions)
As of
June 30,
2019
 
As of
December 31,
2018
Raw materials
$
205.0

 
$
196.3

Work in process
427.6

 
606.7

Finished goods
144.1

 
133.5

Total inventory
$
776.7

 
$
936.5

 
 
 
 
Balance Sheet Classification:
 
 
 
Inventory
$
776.7

 
$
929.9

Investments and other assets

 
6.6

Total inventory
$
776.7

 
$
936.5