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Inventory (Tables)
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Components of inventory
 
As of December 31,
(In millions)
2016
 
2015
Raw materials
$
170.4

 
$
213.0

Work in process
698.7

 
577.6

Finished goods
170.3

 
143.0

Total inventory
$
1,039.4

 
$
933.6

 
 
 
 
Balance Sheet Classification:
 
 
 
Inventory
$
1,001.6

 
$
893.4

Investments and other assets
37.8

 
40.2

Total inventory
$
1,039.4

 
$
933.6