Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 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)	$ 1.2	$ 0	$ 1.4
Cash flow hedges of forecasted transactions, net of tax, in accumulated OCI gain (loss)	2.7		2.7		10.0
Cash flow hedge gain (loss) expected to be reclassified within 12 months			$ 1.4
Total derivative contracts, Maturity Date			2016