Pension (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension Benefits [Member]
Components of net periodic benefit cost [Line Items]
Service cost	$ 4.1	$ 3.5	$ 12.2	$ 10.5
Interest cost	9.3	9.5	27.4	28.6
Expected return on plan assets	(10.1)	(10.4)	(30.0)	(31.4)
Amortization of prior service cost	0	0.1	0.1	0.3
Amortization of actuarial losses/(gains)	4.8	2.1	13.1	6.2
Net periodic benefit cost	8.1	4.8	22.8	14.2
Other Benefits [Member]
Components of net periodic benefit cost [Line Items]
Service cost	0	0	0	0
Interest cost	0.4	0.4	1.1	1.2
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)	(0.8)	(0.6)
Net periodic benefit cost	0.1	0.2	0.3	0.6
Foreign Plan [Member]
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans			2.0
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			$ 20.0