Benefit Plans (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
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 2.7	$ 2.7	$ 5.3	$ 5.4
Interest cost	4.0	4.6	8.2	8.4
Expected return on assets	(4.1)	(4.5)	(8.1)	(7.9)
Amortization of transition obligation			0	0.1
Amortization of prior service credit	(0.4)	(0.4)	(0.8)	(0.8)
Recognized actuarial losses	2.2	1.4	4.3	2.8
Net periodic benefit cost	4.4	3.8	8.9	8.0
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	4.6	4.8
Interest cost	3.8	4.4	7.7	7.9
Expected return on assets	(4.1)	(4.5)	(8.1)	(7.9)
Amortization of transition obligation			0	0.1
Amortization of prior service credit	(0.4)	(0.4)	(0.8)	(0.8)
Recognized actuarial losses	2.2	1.4	4.3	2.8
Net periodic benefit cost	3.8	3.3	7.7	6.9
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.4	0.3	0.7	0.6
Interest cost	0.2	0.2	0.5	0.5
Expected return on assets	0	0	0	0
Amortization of transition obligation			0	0
Amortization of prior service credit	0	0	0	0
Recognized actuarial losses	0	0	0	0
Net periodic benefit cost	0.6	0.5	1.2	1.1
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	6.4	5.4
International Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	0.6	0.6	1.3	1.5
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	0.5	1.2	1.1
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	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	3.2	7.6	6.5
International Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost	$ 0.6	$ 0.6	$ 1.3	$ 1.5