Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	$ 2.4		$ 2.4	$ 7.7	$ 7.9
Interest cost	4.0		4.4	12.1	12.8
Expected return on assets	(4.0)		(4.1)	(12.2)	(12.1)
Amortization of transition obligation				0.1	0.1
Amortization of prior service credit	(0.3)		(0.3)	(1.0)	(1.1)
Recognized actuarial losses	1.9		1.7	6.2	4.6
Curtailment gain, net	0		(0.2)	0	(0.2)
Net periodic benefit cost	4.0		3.9	12.9	12.0
Employer contribution		17.2
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	2.1		2.1	6.7	7.0
Interest cost	3.7		4.1	11.4	12.1
Expected return on assets	(4.0)		(4.1)	(12.2)	(12.1)
Amortization of transition obligation				0.1	0.1
Amortization of prior service credit	(0.3)		(0.3)	(1.1)	(1.2)
Recognized actuarial losses	1.9		1.7	6.2	4.6
Curtailment gain, net	0		(0.2)	0	(0.2)
Net periodic benefit cost	3.4		3.3	11.1	10.3
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	0.3		0.3	1.0	0.9
Interest cost	0.3		0.3	0.7	0.7
Expected return on assets	0		0	0	0
Amortization of transition obligation				0	0
Amortization of prior service credit	0		0	0.1	0.1
Recognized actuarial losses	0		0	0	0
Curtailment gain, net	0		0	0	0
Net periodic benefit cost	0.6		0.6	1.8	1.7
U.S. Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	2.7		2.4	9.1	7.9
International Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.7		0.9	2.0	2.4
U.S. Other Retirement Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.6		0.6	1.8	1.7
International Other Retirement Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0		0	0	0
U. S. Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	3.3		3.0	10.9	9.6
International Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	$ 0.7		$ 0.9	$ 2.0	$ 2.4