Pension (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
Pension Benefits [Member]
Components of net periodic benefit cost [Line Items]
Service cost	$ 3.9	$ 3.5	$ 8.1	$ 7.0
Interest cost	9.1	9.6	18.1	19.1
Expected return on plan assets	(9.9)	(10.5)	(19.9)	(21.0)
Amortization of prior service cost	0	0.1	0.1	0.2
Amortization of actuarial losses/(gains)	4.1	2.1	8.3	4.1
Net periodic benefit cost	7.2	4.8	14.7	9.4
Other Benefits [Member]
Components of net periodic benefit cost [Line Items]
Service cost	0	0	0	0
Interest cost	0.4	0.4	0.7	0.8
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of actuarial losses/(gains)	(0.3)	(0.2)	(0.5)	(0.4)
Net periodic benefit cost	0.1	0.2	0.2	0.4
Foreign Plan [Member]
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans			1.3
Defined Benefit Plan Estimated Total Employer Contributions In Current Fiscal Year			2.6
Domestic Plan [Member]
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans			$ 5.0