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Fair Value Measurements
9 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Fair Value Measurements
4.   Fair Value Measurements
    In accordance with authoritative guidance for fair value measurements, certain assets and liabilities are required to be recorded at fair value and classified within a fair value hierarchy based on inputs used when measuring fair value. We have investments in equity securities classified as available-for-sale and an immaterial amount of forward exchange contracts that are adjusted to fair value on a recurring basis. The fair values of our investments in available-for-sale securities were determined using quoted market prices from daily exchange traded markets and are classified within Level 1 of the valuation hierarchy. The fair values of our available-for-sale securities are $13.5 million and $22.6 million as of September 30, 2011 and December 31, 2010, respectively, and are included in other non-current assets in the Consolidated Balance Sheets.
 
    Other financial instruments, including cash and equivalents and short-term investments, are recorded at cost, which approximates fair value. The fair value of our long-term borrowings is $1.3 billion as of September 30, 2011 and December 31, 2010, and was estimated based on quoted market prices.