Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 189.3	$ 193.8	$ 393.2	$ 396.8
Other comprehensive income/(loss), net of tax (Note 7):
Unrealized gains/(losses) on investment securities	(6.8)	3.9	(5.8)	6.7
Unrealized gains/(losses) on hedging activities	(38.2)	2.2	2.4	3.8
Foreign currency translation adjustments	(1.7)	(0.2)	(4.3)	(7.2)
Defined benefit pension plan adjustments	1.3	1.6	3.1	3.2
Total other comprehensive income/(loss)	(45.4)	7.5	(4.6)	6.5
Comprehensive income	$ 143.9	$ 201.3	$ 388.6	$ 403.3