Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	$ 1.2	$ 0.8	$ 1.4	$ 0.9
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(11.1)		(11.1)		(16.7)	6.1
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			9.1
Total derivative contracts, Maturity Date			2015
Notional Amount of Interest Rate Derivatives	$ 100.0		$ 100.0
Forward exchange contracts maturity term			3
Number of interest rate swap instruments (as an integer)	3		3