Acquisitions (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Acquisitions [Abstract]
Purchase price in excess of the identifiable assets and liabilities recorded to goodwill	$ 6.8
OneMind Connect, Inc. [Member]
Business Acquisition [Line Items]
Amount paid upon closing for the acquisition	5.5
Contingent consideration	1.6
Current year or future payments based on terms of the agreement	1.3
Galaxy Technologies, Inc. [Member]
Business Acquisition [Line Items]
Amount paid upon closing for the acquisition	7.4
Contingent consideration	1.4
Current year or future payments based on terms of the agreement	1.4
Human Concepts [Member]
Business Acquisition [Line Items]
Amount paid upon closing for the acquisition	10.8
Current year or future payments based on terms of the agreement	$ 1.2