Pension (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					1 Months Ended
	Mar. 31, 2012 Pension Benefits [Member]	Mar. 31, 2011 Pension Benefits [Member]	Mar. 31, 2012 Other Benefits [Member]	Mar. 31, 2011 Other Benefits [Member]	Mar. 31, 2012 Foreign Plan [Member]	Apr. 30, 2012 Domestic Plan [Member]
Components of net periodic benefit cost [Line Items]
Service cost	$ 4.2	$ 3.5	$ 0	$ 0
Interest cost	9.0	9.5	0.3	0.4
Expected return on plan assets	(10.0)	(10.5)	0	0
Amortization of prior service cost	0.1	0.1	0	0
Amortization of actuarial losses/(gains)	4.2	2.0	(0.2)	(0.2)
Net periodic benefit cost	7.5	4.6	0.1	0.2
Contribution to defined benefit pension plans					0.6	5.0
Defined Benefit Plan Estimated Total Employer Contributions In Current Fiscal Year					$ 2.6