Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Revenues:
Transaction fees	$ 994.9	$ 1,040.8	$ 2,931.8		$ 3,057.7
Foreign exchange revenues	372.3	360.6	1,072.4		1,034.2
Other revenues	32.0	39.5	99.5		105.4
Total revenues	1,399.2	1,440.9	4,103.7		4,197.3
Operating income/(loss):
Operating income/(loss)	304.5	314.1	827.6		864.4
Operating Segments [Member] | Consumer-to-Consumer [Member]
Revenues:
Transaction fees	820.4	874.0	2,412.7		2,566.7
Foreign exchange revenues	276.1	258.3	789.1		743.9
Other revenues	16.4	18.6	50.9		49.9
Total revenues	1,112.9	1,150.9	3,252.7		3,360.5
Operating income/(loss):
Operating income/(loss)	283.3	286.1	780.1		790.6
Operating Segments [Member] | Consumer-to-Business [Member]
Revenues:
Transaction fees	154.1	144.0	457.1		424.1
Foreign exchange and other revenues	6.0	6.4	18.7		19.4
Total revenues	160.1	150.4	475.8		443.5
Operating income/(loss):
Operating income/(loss)	26.2	23.2	49.3	[1]	76.6
Operating Segments [Member] | Business Solutions [Member]
Revenues:
Foreign exchange revenues	90.6	94.4	266.0		272.5
Transaction fees and other revenues	10.6	11.4	30.8		30.9
Total revenues	101.2	105.8	296.8		303.4
Operating income/(loss):
Operating income/(loss)	(2.7)	(0.2)	(1.0)		(7.1)
Segment Reconciling Items [Member]
Revenues:
Total revenues	25.0	33.8	78.4		89.9
Operating income/(loss):
Operating income/(loss)	$ (2.3)	$ 5.0	$ (0.8)		$ 4.3

[1] For the nine months ended September 30, 2015, Consumer-to-Business operating income included $35.3 million of expenses related to the Paymap Settlement Agreement. For additional information on the Paymap Settlement Agreement, refer to Note 4.