Derivative Financial Instruments (Schedule Of Notional Amounts Of Outstanding Derivative Positions (Details) - Dec. 31, 2015 € in Millions, £ in Millions, SGD in Millions, NOK in Millions, MYR in Millions, CAD in Millions, BRL in Millions, $ in Millions	USD ($)	BRL	NOK	SGD	MYR	EUR (€)	CAD	GBP (£)
Foreign Exchange Forward | Brazilian real | Notional amount bought
Derivative [Line Items]
Derivative, Notional Amount	$ 69.3	BRL 270.5
Foreign Exchange Forward | British pound | Notional amount bought
Derivative [Line Items]
Derivative, Notional Amount	123.6							£ 83.4
Foreign Exchange Forward | Canadian dollar | Notional amount sold
Derivative [Line Items]
Derivative, Notional Amount	141.1						CAD 195.8
Foreign Exchange Forward | Euro | Notional amount bought
Derivative [Line Items]
Derivative, Notional Amount	165.0					€ 151.6
Foreign Exchange Forward | Malaysian ringgit | Notional amount bought
Derivative [Line Items]
Derivative, Notional Amount	45.2				MYR 194.0
Foreign Exchange Forward | Norwegian krone | Notional amount bought
Derivative [Line Items]
Derivative, Notional Amount	249.5		NOK 2,199.9
Foreign Exchange Forward | Singapore dollar | Notional amount bought
Derivative [Line Items]
Derivative, Notional Amount	150.7			SGD 213.4
Foreign Exchange Forward | U.S. dollar | Notional amount sold
Derivative [Line Items]
Derivative, Notional Amount	889.7
Embedded Derivative Financial Instruments | Brazilian real | Notional amount sold
Derivative [Line Items]
Derivative, Notional Amount	21.6	BRL 84.3
Embedded Derivative Financial Instruments | Euro | Notional amount bought
Derivative [Line Items]
Derivative, Notional Amount	14.3					€ 13.1
Embedded Derivative Financial Instruments | Norwegian krone | Notional amount sold
Derivative [Line Items]
Derivative, Notional Amount	14.9		NOK 131.5
Embedded Derivative Financial Instruments | U.S. dollar | Notional amount bought
Derivative [Line Items]
Derivative, Notional Amount	$ 24.8