Accumulated Other Comprehensive Loss (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accumulated Other Comprehensive Loss (Textual) [Abstract]
Tax benefit on change in funded status of pension liability	$ (16.9)	$ 5.2	$ 20.9
Tax expense (benefit) on change in unrealized loss on derivative financial instruments	0.4	(2.6)	14.2
Tax expense on other changes	0	0.7	0
Tax benefit on currency translation adjustment	(0.2)	(0.2)
Tax benefit on unrealized loss on derivative financial instruments	(34.9)	(21.4)
Tax benefit on funded status of pension liability	$ (41.7)	$ (24.8)