Derivative Financial Instruments (Schedule Of Notional Amounts Of Outstanding Derivative Positions) (Detail) - Mar. 31, 2017 € in Millions, £ in Millions, SGD in Millions, NOK in Millions, NGN in Millions, MYR in Millions, CAD in Millions, BRL in Millions, AUD in Millions, $ in Millions	EUR (€)	USD ($)	AUD	BRL	CAD	MYR	GBP (£)	NOK	NGN	SGD
Foreign Exchange Forward | Australian dollar | Notional Amount Bought
Derivative
Derivative, notional amount		$ 180.3	AUD 236.6
Foreign Exchange Forward | Brazilian real | Notional Amount Bought
Derivative
Derivative, notional amount		179.8		BRL 571.9
Foreign Exchange Forward | British pound | Notional Amount Bought
Derivative
Derivative, notional amount		273.7					£ 219.4
Foreign Exchange Forward | Canadian dollar | Notional Amount Sold
Derivative
Derivative, notional amount		129.8			CAD 172.7
Foreign Exchange Forward | Euro | Notional Amount Bought
Derivative
Derivative, notional amount	€ 895.0	966.2
Foreign Exchange Forward | Malaysian ringgit | Notional Amount Bought
Derivative
Derivative, notional amount		52.7				MYR 233.2
Foreign Exchange Forward | Nigerian naira | Notional Amount Sold
Derivative
Derivative, notional amount		17.2							NGN 5,341.3
Foreign Exchange Forward | Norwegian krone | Notional Amount Bought
Derivative
Derivative, notional amount		107.7						NOK 919.9
Foreign Exchange Forward | Singapore dollar | Notional Amount Bought
Derivative
Derivative, notional amount		92.3								SGD 129.0
Foreign Exchange Forward | U.S. dollar | Notional Amount Sold
Derivative
Derivative, notional amount		1,741.0
Derivative financial instruments - Embedded Derivatives | Brazilian real | Notional Amount Sold
Derivative
Derivative, notional amount		17.1		BRL 54.4
Derivative financial instruments - Embedded Derivatives | Euro | Notional Amount Sold
Derivative
Derivative, notional amount	€ 23.7	25.4
Derivative financial instruments - Embedded Derivatives | Norwegian krone | Notional Amount Sold
Derivative
Derivative, notional amount		27.9						NOK 240.2
Derivative financial instruments - Embedded Derivatives | U.S. dollar | Notional Amount Bought
Derivative
Derivative, notional amount		$ 68.7