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Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 countries customers	Mar. 31, 2011 customers countries	Mar. 31, 2012 United States	Dec. 31, 2011 United States	Mar. 31, 2012 Foreign locations [Member]	Dec. 31, 2011 Foreign locations [Member]
Segment Reporting Information [Line Items]
Property and equipment, net			$ 210.6	$ 194.0	$ 92.9	$ 99.0
Percentage of revenue from outside U.S.	28.00%	30.00%
Percentage of revenues related to Europe	17.00%	18.00%
Number of foreign countries greater than 10% revenue	0	0
Number of customers accounted for 10% or more of total revenues	0	0

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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