Derivative Financial Instruments (Schedule Of Notional Amounts Of Outstanding Derivative Positions) (Details) - Jun. 30, 2017 € in Millions, £ in Millions, SGD in Millions, RUB in Millions, NOK in Millions, NGN in Millions, MYR in Millions, CAD in Millions, BRL in Millions, AUD in Millions, $ in Millions	USD ($)	EUR (€)	GBP (£)	CAD	MYR	BRL	NOK	SGD	RUB	NGN	AUD
Foreign Exchange Forward | Australian dollar | Notional Amount Bought
Derivative
Derivative, notional amount	$ (138.2)										AUD (182.4)
Foreign Exchange Forward | Brazilian real | Notional Amount Bought
Derivative
Derivative, notional amount	(250.5)					BRL (829.5)
Foreign Exchange Forward | British pound | Notional Amount Bought
Derivative
Derivative, notional amount	(309.9)		£ (243.6)
Foreign Exchange Forward | Canadian dollar | Notional Amount Sold
Derivative
Derivative, notional amount	(139.5)			CAD (181.3)
Foreign Exchange Forward | Euro | Notional Amount Bought
Derivative
Derivative, notional amount	(1,115.7)	€ (997.1)
Foreign Exchange Forward | Malaysian ringgit | Notional Amount Bought
Derivative
Derivative, notional amount	(27.6)				MYR (118.4)
Foreign Exchange Forward | Nigerian naira | Notional Amount Sold
Derivative
Derivative, notional amount	(16.7)									NGN (5,566.3)
Foreign Exchange Forward | Norwegian krone | Notional Amount Sold
Derivative
Derivative, notional amount	(50.4)						NOK (420.6)
Foreign Exchange Forward | Russian ruble | Notional Amount Bought
Derivative
Derivative, notional amount	(19.5)								RUB (1,152.7)
Foreign Exchange Forward | Singapore dollar | Notional Amount Bought
Derivative
Derivative, notional amount	(67.7)							SGD (93.1)
Foreign Exchange Forward | U.S. dollar | Notional Amount Sold
Derivative
Derivative, notional amount	(1,736.7)
Derivative financial instruments – Embedded Derivatives | Brazilian real | Notional Amount Sold
Derivative
Derivative, notional amount	(14.3)					BRL (47.3)
Derivative financial instruments – Embedded Derivatives | Euro | Notional Amount Sold
Derivative
Derivative, notional amount	(29.1)	€ (25.5)
Derivative financial instruments – Embedded Derivatives | Norwegian krone | Notional Amount Sold
Derivative
Derivative, notional amount	(20.5)						NOK (172.2)
Derivative financial instruments – Embedded Derivatives | U.S. dollar | Notional Amount Bought
Derivative
Derivative, notional amount	$ (60.0)