Derivative Financial Instruments (Schedule Of Notional Amounts Of Outstanding Derivative Positions) (Details) - Sep. 30, 2016 € 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	USD ($)	CAD	BRL	MYR	SGD	NGN	EUR (€)	GBP (£)	NOK	AUD
Foreign Exchange Forward | Australian dollar | Notional Amount Bought
Derivative
Derivative, notional amount	$ 98.8									AUD 129.2
Foreign Exchange Forward | Brazilian real | Notional Amount Bought
Derivative
Derivative, notional amount	144.5		BRL 469.2
Foreign Exchange Forward | British pound | Notional Amount Bought
Derivative
Derivative, notional amount	138.2							£ 106.5
Foreign Exchange Forward | Canadian dollar | Notional Amount Sold
Derivative
Derivative, notional amount	132.3	CAD 173.4
Foreign Exchange Forward | Euro | Notional Amount Bought
Derivative
Derivative, notional amount	152.5						€ 136.5
Foreign Exchange Forward | Malaysian ringgit | Notional Amount Bought
Derivative
Derivative, notional amount	30.2			MYR 124.9
Foreign Exchange Forward | Nigerian naira | Notional Amount Sold
Derivative
Derivative, notional amount	17.2					NGN 5,408.8
Foreign Exchange Forward | Singapore dollar | Notional Amount Bought
Derivative
Derivative, notional amount	123.5				SGD 168.4
Foreign Exchange Forward | U.S. dollar | Notional Amount Sold
Derivative
Derivative, notional amount	641.1
Embedded Derivative Financial Instruments | Euro | Notional Amount Sold
Derivative
Derivative, notional amount	38.3						€ 34.3
Embedded Derivative Financial Instruments | Norwegian krone | Notional Amount Sold
Derivative
Derivative, notional amount	30.0								NOK 240.9
Embedded Derivative Financial Instruments | U.S. dollar | Notional Amount Bought
Derivative
Derivative, notional amount	$ 76.3