Financial Instruments (Narrative) (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Derivatives
Derivative instruments maturity period (in months)	33
Notional value of foreign currency cash flow derivatives	$ 453.4		$ 571.6
Deferred tax expense	2.2		12.0
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	3.5		18.7
Deferred gain on derivative instruments reclassified from OCI to earnings during the next the next twelve months, before tax	3.5
Deferred gain on derivative instruments reclassified from OCI to earnings during next twelve months, net of tax	2.2
Derivative Instruments Not Designated as Hedging Instruments, Loss	1.4
Derivative Instruments Not Designated as Hedging Instruments, Gain		0.8
Aggregate fair value of derivative instruments in liability positions	12.1
Collateral Already Posted, Aggregate Fair Value	$ 0