Segments (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Revenues:
Transaction fees	$ 988.3		$ 1,029.0	$ 1,936.9		$ 2,016.9
Foreign exchange revenues	362.1		344.3	700.1		673.6
Other revenues	33.2		32.3	67.5		65.9
Total revenues	1,383.6		1,405.6	2,704.5		2,756.4
Operating income/(loss):
Operating income/(loss)	250.8		278.3	523.1		550.3
Operating Segments [Member] | Consumer-to-Consumer [Member]
Revenues:
Transaction fees	816.1		867.1	1,592.3		1,692.7
Foreign exchange revenues	268.9		249.6	513.0		485.6
Other revenues	16.5		15.4	34.5		31.3
Total revenues	1,101.5		1,132.1	2,139.8		2,209.6
Operating income/(loss):
Operating income/(loss)	256.6		257.5	496.8		504.5
Operating Segments [Member] | Consumer-to-Business [Member]
Revenues:
Transaction fees	151.6		139.4	303.0		280.1
Foreign exchange and other revenues	6.3		6.5	12.7		13.0
Total revenues	157.9		145.9	315.7		293.1
Operating income/(loss):
Operating income/(loss)	(6.4)	[1]	23.6	23.1	[1]	53.4
Operating Segments [Member] | Business Solutions [Member]
Revenues:
Foreign exchange revenues	87.5		87.7	175.4		178.1
Transaction fees and other revenues	10.1		10.5	20.2		19.5
Total revenues	97.6		98.2	195.6		197.6
Operating income/(loss):
Operating income/(loss)	(0.4)		(3.3)	1.7		(6.9)
Segment Reconciling Items [Member]
Revenues:
Total revenues	26.6		29.4	53.4		56.1
Operating income/(loss):
Operating income/(loss)	$ 1.0		$ 0.5	$ 1.5		$ (0.7)

[1] For both the three and six months ended June 30, 2015, Consumer-to-Business operating income/(loss) included $35.3 million of expenses related to the Paymap Settlement Agreement. For additional information on the Paymap Settlement Agreement, refer to Note 4.