Benefit Plans (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Benefit Plans Disclosure [Line Items]
Service cost	$ 2.7	$ 2.5	$ 5.4	$ 5.0
Interest cost	4.6	4.0	8.4	8.1
Expected return on assets	4.5	3.5	7.9	7.0
Amortization of transition obligation			0.1	0
Amortization of prior service credit	(0.4)	(0.3)	(0.8)	(0.6)
Recognized actuarial losses	1.4	1.3	2.8	2.6
Net periodic benefit cost	3.8	4.0	8.0	8.1
Pension Benefits [Member]
Benefit Plans Disclosure [Line Items]
Service cost	2.4	2.2	4.8	4.5
Interest cost	4.4	3.8	7.9	7.6
Expected return on assets	4.5	3.5	7.9	7.0
Amortization of transition obligation			0.1	0
Amortization of prior service credit	(0.4)	(0.3)	(0.8)	(0.6)
Recognized actuarial losses	1.4	1.3	2.8	2.6
Net periodic benefit cost	3.3	3.5	6.9	7.1
Other Retirement Benefits [Member]
Benefit Plans Disclosure [Line Items]
Service cost	0.3	0.3	0.6	0.5
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	0.5	0.5	1.1	1.0
International Other Retirement Benefit Plans [Member]
Benefit Plans Disclosure [Line Items]
Net periodic benefit cost	0	0	0	0
U.S. Other Retirement Benefit Plans [Member]
Benefit Plans Disclosure [Line Items]
Net periodic benefit cost	0.5	0.5	1.1	1.0
International Pension Benefit Plans [Member]
Benefit Plans Disclosure [Line Items]
Net periodic benefit cost	0.6	0.4	1.5	0.9
U.S. Pension Benefit Plans [Member]
Benefit Plans Disclosure [Line Items]
Net periodic benefit cost	2.7	3.1	5.4	6.2
U.S. Plans [Member]
Benefit Plans Disclosure [Line Items]
Net periodic benefit cost	3.2	3.6	6.5	7.2
International Plans [Member]
Benefit Plans Disclosure [Line Items]
Net periodic benefit cost	$ 0.6	$ 0.4	$ 1.5	$ 0.9