Pension (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans			$ 2.1	$ 2.6
Pension Benefits [Member]
Components of net periodic benefit cost [Line Items]
Service cost	3.5	3.0	10.5	9.1
Interest cost	9.5	9.4	28.6	28.1
Expected return on plan assets	(10.4)	(10.4)	(31.4)	(31.3)
Amortization of prior service cost	0.1	0.1	0.3	0.2
Amortization of actuarial losses/(gains)	2.1	1.3	6.2	3.8
Net periodic benefit cos	4.8	3.4	14.2	9.9
Other Benefits [Member]
Components of net periodic benefit cost [Line Items]
Service cost	0	0.1	0	0.2
Interest cost	0.4	0.5	1.2	1.6
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of actuarial losses/(gains)	(0.2)	(0.1)	(0.6)	(0.2)
Net periodic benefit cos	0.2	0.5	0.6	1.6
Foreign Plan [Member]
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans			2.1
Defined Benefit Plan Estimated Total Employer Contributions In Current Fiscal Year	$ 3.0		$ 3.0