Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative [Line Items]
Forward exchange contracts maturity term (in years)	3 years
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	$ 0.3	$ 0.2
Cash flow hedges of forecasted transactions, net of tax, in accumulated OCI gain (loss)	(14.3)		10.0
Cash flow hedge gain (loss) expected to be reclassified within 12 months	$ (10.5)
Total derivative contracts, Maturity Date	2015