Intangible Assets and Goodwill - Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Mar. 31, 2012 BeCompliant Corporation (Encryptx)	Sep. 30, 2011 BeCompliant Corporation (Encryptx)	Sep. 30, 2012 Mobil Security reporting unit
Goodwill [Line Items]
Goodwill	$ 31.3		$ 31.3			$ 31.3			$ 31.3
Goodwill acquired							1.6
Goodwill impairment	0	0	0	1.6				1.6
Goodwill Impairment Test, Reporting Unit, at Carrying Value	$ 48.5		$ 48.5		$ 50.2
Goodwill Impairment Test, Estimated Fair Value in Excess of Carrying Value, Percentage	17.70%		17.70%		43.30%