Subsequent Events (Details) (Subsequent Event [Member]) In Millions, unless otherwise specified		0 Months Ended
	Aug. 14, 2014 USD ($)	Aug. 14, 2014 Network1 [Member] USD ($)	Aug. 14, 2014 Network1 [Member] BRL	Aug. 14, 2014 Imago [Member] USD ($)	Aug. 14, 2014 Imago [Member] GBP (£)
Subsequent Event [Line Items]
Expected payments to acquire businesses		$ 70.4	159.6
Estimated purchase price		135.4	307.0	41.0	24.5
Stock repurchase, authorized amount	$ 120.0