Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Amount of deferred tax liability attributable to taxable temporary differences from capitalized costs.

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Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

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Amount of realized and unrealized loss of derivative instruments not designated or qualifying as hedging instruments.

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Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Derivatives
Derivative instruments maturity period (in months)	39 months
Derivative, Notional Amount	$ 968.6				$ 590.4
Deferred tax expense (benefit)	(14.2)				7.1
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(22.4)		(16.4)	9.6	11.4
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	(15.3)
Deferred gain on derivative instruments reclassified from OCI to earnings during next twelve months, net of tax	(9.4)
Derivative Instruments Not Designated as Hedging Instruments, Loss	4.5	(1.0)
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	3.4
Aggregate fair value of derivative instruments in liability positions	44.2
Trading Securities	13.5
Interest-bearing deposits, fair value	113.0
Foreign Currency Derivative Purchase Contract [Domain] \| Forward Contracts PHP [Member]
Derivatives
Derivative, Notional Amount	29,802.0
Foreign Currency Derivative Purchase Contract [Domain] \| Forward Contracts INR [Member]
Derivatives
Derivative, Notional Amount	11,663.0
Foreign Currency Derivative Purchase Contract [Domain] \| Forward Contracts CAD [Member]
Derivatives
Derivative, Notional Amount	28.3
Foreign Currency Derivative Purchase Contract [Domain] \| Forward Contracts COP [Member]
Derivatives
Derivative, Notional Amount	26,400.0
Cash Flow Hedging [Member] \| Forward Contracts PHP [Member]
Derivatives
Derivative, Notional Amount	696.8
Cash Flow Hedging [Member] \| Forward Contracts INR [Member]
Derivatives
Derivative, Notional Amount	196.5
Cash Flow Hedging [Member] \| Forward Contracts CAD [Member]
Derivatives
Derivative, Notional Amount	27.3
Cash Flow Hedging [Member] \| Forward Contracts COP [Member]
Derivatives
Derivative, Notional Amount	13.8
Cash Flow Hedging [Member] \| Forward Contracts AUD [Member]
Derivatives
Derivative, Notional Amount	34.2
Foreign Currency Derivative Sale Contract [Member] \| Forward Contracts AUD [Member]
Derivatives
Derivative, Notional Amount	$ 33.6