Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Silicon Manufacturing Partners Pte Ltd. [Member]
Related Party Transactions (Textual) [Abstract]
Company's equity interest in SMP joint venture	51.00%
Purchase of inventory from SMP	$ 49.0	$ 44.0	$ 46.1
Amounts payable to SMP	5.0	1.2
Seagate Technology [Member]
Related Party Transactions (Textual) [Abstract]
Revenues from sales to Seagate	520.5	355.5	344.2
Accounts receivable from Seagate	$ 90.3	$ 55.0