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Inventory

12 Months Ended

Dec. 31, 2011

6. Inventory

The components of inventory are summarized as follows:


	As of December 31,
(In millions)	2011		2010
Raw materials	$	83.8	$	59.0
Work in process		169.4		142.2
Finished goods		73.6		87.9

Total inventory	$	326.8	$	289.1

The components of inventory by product are summarized as follows:


	As of December 31,
(In millions)	2011		2010
AVONEX	$	113.3	$	87.0
TYSABRI		114.7		117.0
Other		15.0		26.1

Total finished goods and work in process		243.0		230.1

Raw materials		83.8		59.0

Total inventory	$	326.8	$	289.1

Amounts written down related to excess, obsolete or unmarketable inventory are charged to cost of sales, and totaled $25.4 million, $11.8 million, and $16.9 million for the years ended December 31, 2011, 2010, and 2009, respectively.

- Definition

The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.

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