Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 2.6	$ 2.7
Interest cost	4.2	4.3
Expected return on assets	(4.1)	(4.0)
Amortization of prior service credit	(0.4)	(0.4)
Recognized actuarial losses	2.1	1.5
Net periodic benefit cost	4.4	4.1
Employer contribution	17.2
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	2.3	2.4
Interest cost	3.9	4.0
Expected return on assets	(4.1)	(4.0)
Amortization of prior service credit	(0.4)	(0.4)
Recognized actuarial losses	2.1	1.5
Net periodic benefit cost	3.8	3.5
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.3	0.3
Interest cost	0.3	0.3
Expected return on assets	0	0
Amortization of prior service credit	0	0
Recognized actuarial losses	0	0
Net periodic benefit cost	0.6	0.6
U.S. Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	3.2	2.7
International Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	0.6	0.8
U.S. Other Retirement Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	0.6	0.6
International Other Retirement Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	0	0
U. S. Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	3.8	3.3
International Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	$ 0.6	$ 0.8