Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Derivatives
Derivative instruments maturity period (in months)	36 months
Derivative, Notional Amount	$ 1,108.2		$ 965.5
Deferred tax expense (benefit)	(14.1)		(14.1)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(22.7)	9.6	(22.5)	11.4
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	19.5
Deferred gain on derivative instruments reclassified from OCI to earnings during next twelve months, net of tax	12.1
Derivative Instruments Not Designated as Hedging Instruments, Loss	(1.8)	0.2
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	0.1
Aggregate fair value of derivative instruments in liability positions	43.5
Trading Securities	13.5
Interest-bearing deposits, fair value	6.8
Foreign Currency Derivative Purchase Contract [Domain] | Forward Contracts PHP [Member]
Derivatives
Derivative, Notional Amount	38,354.0
Foreign Currency Derivative Purchase Contract [Domain] | Forward Contracts INR [Member]
Derivatives
Derivative, Notional Amount	10,424.0
Foreign Currency Derivative Purchase Contract [Domain] | Forward Contracts CAD [Member]
Derivatives
Derivative, Notional Amount	41.3
Foreign Currency Derivative Purchase Contract [Domain] | Forward Contracts COP [Member]
Derivatives
Derivative, Notional Amount	15,300.0
Cash Flow Hedging [Member] | Forward Contracts PHP [Member]
Derivatives
Derivative, Notional Amount	881.5
Cash Flow Hedging [Member] | Forward Contracts INR [Member]
Derivatives
Derivative, Notional Amount	168.0
Cash Flow Hedging [Member] | Forward Contracts CAD [Member]
Derivatives
Derivative, Notional Amount	39.2
Cash Flow Hedging [Member] | Forward Contracts COP [Member]
Derivatives
Derivative, Notional Amount	8.0
Cash Flow Hedging [Member] | Forward Contracts AUD [Member]
Derivatives
Derivative, Notional Amount	11.5
Foreign Currency Derivative Sale Contract [Member] | Forward Contracts AUD [Member]
Derivatives
Derivative, Notional Amount	$ 11.3