Fair Value Of Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified						3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Accrued Expenses [Member]	Dec. 31, 2011 Accrued Expenses [Member]	Mar. 31, 2012 Other Accounts Receivable [Member]	Mar. 31, 2012 Other (Expenses) Income [Member]	Mar. 31, 2011 Other (Expenses) Income [Member]	Mar. 31, 2012 Other, Net [Member]	Mar. 31, 2011 Other, Net [Member]	Mar. 31, 2012 4.50% Senior Notes [Member]	Mar. 31, 2012 5.10% Senior Notes [Member]
Fair Value Of Financial Instruments [Line Items]
Debt instrument, interest rate										4.50%	5.10%
Foreign currency forward contracts, notional values	$ 194.6	$ 148.7
Fair value foreign currency forward contracts, assets					0.2
Fair value of foreign currency forward contracts, liabilities			0.2	0.9
Recognized gains of foreign currency forward contracts						1.3	5.8
Change in the fair value of foreign currency forward contracts								(1.3)	(5.8)
Cash settlements								$ 0.4	$ 0.9