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Inventory | 12 Months Ended
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Dec. 31, 2013
Inventory Disclosure [Abstract] |
Inventory |
| Inventory
The components of inventory are summarized as follows:
| As of December 31,
(In millions) | 2013 |  | 2012
Raw materials | $ | 115.0 |  |  | $ | 101.8 |
Work in process | 435.4 |  |  | 244.9 |
Finished goods | 108.6 |  |  | 100.7 |
Total inventory | $ | 659.0 |  |  | $ | 447.4 |
In prior years AVONEX PEN units, which have been assembled but not yet packaged, were classified as finished goods. For the year ended December 31, 2013, they are classified as work in process. We reclassified $14.4 million as of December 31, 2012 to be consistent with this new presentation. The components of inventory by product are summarized as follows:
| As of December 31,
(In millions) | 2013 |  | 2012
AVONEX | $ | 176.9 |  |  | $ | 144.0 |
TYSABRI | 170.9 |  |  | 114.8 |
TECFIDERA | 33.6 |  |  | — |
Other | 162.6 |  |  | 86.8 |
Total finished goods and work in process | 544.0 |  |  | 345.6 |
Raw materials | 115.0 |  |  | 101.8 |
Total inventory | $ | 659.0 |  |  | $ | 447.4 |
As of December 31, 2013 and 2012, $93.7 million and $38.3 million, respectively, of our inventory, including costs associated with our ELOCTATE, ALPROLIX and PLEGRIDY programs, have been capitalized in advance of regulatory approval and included in Other in the table above. For information on our pre-approval policy, please read Note 1, Summary of Significant Accounting Policies to these consolidated financial statements Amounts written down related to excess, obsolete, unmarketable or other inventory are charged to cost of sales, and totaled $47.3 million, $24.8 million, and $25.4 million for the years ended December 31, 2013, 2012, and 2011, respectively.

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a, b, c -Article 5 + Details
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