Inventory (Tables)

12 Months Ended

Dec. 31, 2015

Inventory Disclosure [Abstract]

Components of inventory

	As of December 31,
(In millions)	2015		2014
Raw materials	$	213.0	$	128.3
Work in process	577.6		511.5
Finished goods	143.0		164.2
Total inventory	$	933.6	$	804.0
Balance Sheet Classification:
Inventory	$	893.4	$	804.0
Investments and other assets	40.2		—
Total inventory	$	933.6	$	804.0