Fair Value Measurement (Narrative) (Details) In Millions	0 Months Ended	12 Months Ended
May 28, 2010 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2011 Auralis Limited [Member] GBP (£)	Jun. 30, 2011 Auralis Limited [Member] USD ($)	May 28, 2010 Auralis Limited [Member] GBP (£)
Contingent consideration, potential cash payment			£ 10.0	$ 16.0
Fair value of contingent consideration	9.0				6.2
Fair value of contingent consideration			8.6	13.9
Change in other operating expenses due to change in fair value of acquisition	$ 3.9	$ 2.5

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details

- Definition

Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date.

+ References

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+ Details