Employee Benefit Plans (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in plan assets:
Fair value of plan assets at end of year	$ 242.5	$ 244.6
Pension Benefits [Member]
Pension and Postretirement Benefit Plans recognized in financial statements
Accumulated benefit obligation	363.6	333.2
Changes in projected benefit obligation:
Benefit obligation at beginning of year	336.3	299.4
Service cost	5.4	5.0	5.6
Interest cost	17.8	17.6	17.5
Actuarial loss	28.9	34.0
Effect of exchange rates	(0.7)	0.4
Settlements and curtailments	(2.1)	(2.6)
Benefits paid	(16.8)	(17.5)
Benefit obligation at end of year	368.8	336.3	299.4
Changes in plan assets:
Fair value of plan assets at beginning of year	244.6	231.1
Actual gain return on plan assets	3.8	27.6
Employer contribution	13.4	5.6
Effect of exchange rates	(0.4)	0.4
Plan settlements	(2.1)	(2.6)
Benefits paid	(16.8)	(17.5)
Fair value of plan assets at end of year	242.5	244.6	231.1
Funded status / net amount recognized	(126.3)	(91.7)
Net amount recognized consists of:
Current liability	(1.6)	(3.6)
Non-current liability	(124.7)	(88.1)
Net amount recognized	(126.3)	(91.7)
Other Benefits [Member]
Changes in projected benefit obligation:
Benefit obligation at beginning of year	17.0	14.4
Service cost	0.8	0.6	0.5
Interest cost	0.9	0.8	0.8
Plan participants' contributions	0.8	0.8
Amendments		(0.1)
Actuarial loss	2.3	2.4
Benefits paid	(1.9)	(1.9)
Benefit obligation at end of year	19.9	17.0	14.4
Changes in plan assets:
Fair value of plan assets at beginning of year	0	0
Employer contribution	1.1	1.1
Plan participants' contributions	0.8	0.8
Benefits paid	(1.9)	(1.9)
Fair value of plan assets at end of year	0	0	0
Funded status / net amount recognized	(19.9)	(17.0)
Net amount recognized consists of:
Current liability	(1.3)	(1.1)
Non-current liability	(18.6)	(15.9)
Net amount recognized	$ (19.9)	$ (17.0)