Financial Instruments (Narrative) (Details) ₨ in Millions, PHP in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 PHP	Dec. 31, 2015 INR (₨)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Derivatives
Derivative, Notional Amount	$ 1,040.8			$ 1,131.7
Derivative instruments maturity period (in months)	36 months	36 months	36 months
Deferred tax expense	$ (16.2)			(11.3)
Deferred gains (losses), net of tax	26.1			18.3	$ 22.5
Deferred gain on derivative instruments reclassified from OCI to earnings during the next the next twelve months, before tax	(28.4)
Deferred gain on derivative instruments reclassified from OCI to earnings during next twelve months, net of tax	(17.5)
Derivative Instruments Not Designated as Hedging Instruments, Gain	0.3			2.0
Net loss related to settlement of forward contracts	(25.2)			(14.3)	$ (2.1)
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0.1
Aggregate fair value of derivative instruments in liability positions	44.4
Aggregate fair value of collateral already posted	0.0
Trading Securities, Fair Value Disclosure	12.2			$ 13.0
Forward Contracts PHP [Member]
Derivatives
Foreign currency acquired through forward exchange contracts | PHP		PHP 37,623.0
Derivative, Notional Amount	823.4
Forward Contracts INR [Member]
Derivatives
Foreign currency acquired through forward exchange contracts | ₨			₨ 10,932.0
Derivative, Notional Amount	156.2
Forward Contracts CAD [Member]
Derivatives
Foreign currency acquired through forward exchange contracts | PHP		40.7
Derivative, Notional Amount	32.3
Forward Contracts COP [Member]
Derivatives
Foreign currency acquired through forward exchange contracts | PHP		10,000.0
Derivative, Notional Amount	3.2
Forward Contracts AUD [Member]
Derivatives
Foreign currency acquired through forward exchange contracts | PHP		PHP 36.0
Derivative, Notional Amount	$ 25.8