Pension (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Benefits [Member]
Components of net periodic benefit cost [Line Items]
Service cost	$ 4.0	$ 4.2
Interest cost	9.1	9.0
Expected return on plan assets	(11.7)	(10.0)
Amortization of prior service cost	0	0.1
Amortization of actuarial losses/(gains)	3.6	4.2
Net periodic benefit cost	5.0	7.5
Other Benefits [Member]
Components of net periodic benefit cost [Line Items]
Service cost	0	0
Interest cost	0.2	0.3
Expected return on plan assets	0	0
Amortization of prior service cost	(0.2)	0
Amortization of actuarial losses/(gains)	0	(0.2)
Net periodic benefit cost	0	0.1
Foreign Plan [Member]
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans	0.7
Defined Benefit Plan Estimated Total Employer Contributions In Current Fiscal Year	3.3
Domestic Plan [Member]
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans	$ 0