Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Percentage of U.S. and U.K. benefit obligation	77.00%
Percentage of U.S. and U.K. plan assets	90.00%
Contributions to defined contribution plans	$ 17.7	$ 14.8	$ 15.7
Other benefit plans obligations	3.8	5.0
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net gains (losses)	3.2
Amortization of net prior service cost (credit)	0
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net gains (losses)	0.8
Amortization of net prior service cost (credit)	0.1
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	74.9	71.1
Expected contribution by employer in 2012	3.4
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	206.6	202.8
Expected contribution by employer in 2012	$ 4.5