Derivative Financial Instruments (Schedule Of Notional Amounts Of Outstanding Derivative Positions) (Details) - Jun. 30, 2018 € in Millions, ¥ in Millions, £ in Millions, kr in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions	USD ($)	CAD ($)	BRL (R$)	NOK (kr)	SGD ($)	EUR (€)	GBP (£)	JPY (¥)	MXN ($)	AUD ($)
Foreign Exchange Forward | Australian dollar | Notional Amount Bought
Derivative
Derivative, notional amount	$ 148.6									$ 200.0
Foreign Exchange Forward | Brazilian real | Notional Amount Bought
Derivative
Derivative, notional amount	108.3		R$ 417.7
Foreign Exchange Forward | British pound | Notional Amount Bought
Derivative
Derivative, notional amount	125.4						£ 181.5
Foreign Exchange Forward | Canadian dollar | Notional Amount Sold
Derivative
Derivative, notional amount	179.7	$ 237.6
Foreign Exchange Forward | Euro | Notional Amount Bought
Derivative
Derivative, notional amount	629.6					€ 538.6
Foreign Exchange Forward | Mexican peso | Notional Amount Sold
Derivative
Derivative, notional amount	10.1								$ 203.0
Foreign Exchange Forward | Norwegian krone | Notional Amount Sold
Derivative
Derivative, notional amount	310.3			kr 2,541.4
Foreign Exchange Forward | Singapore dollar | Notional Amount Bought
Derivative
Derivative, notional amount	50.2				$ 68.5
Foreign Exchange Forward | Japanese yen | Notional Amount Bought
Derivative
Derivative, notional amount	28.4							¥ 3,107.1
Foreign Exchange Forward | U.S. dollar | Notional Amount Sold
Derivative
Derivative, notional amount	308.1
Derivative financial instruments – Embedded Derivatives | Norwegian krone | Notional Amount Sold
Derivative
Derivative, notional amount	19.4			kr 158.9
Derivative financial instruments – Embedded Derivatives | U.S. dollar | Notional Amount Bought
Derivative
Derivative, notional amount	$ 18.7