Postretirement Benefit Plans (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Employee Benefit Plan (Textual) [Abstract]
Remeasurement of projected benefit obligations and plan assets	$ 41.2
Defined benefit plan accumulated other comprehensive income unrecognized actuarial loss before tax	8.8
Net postretirement liability	293.1
U.S. Pension Plans [Member]
Employee Benefit Plans (Additional Textual) [Abstract]
Contributions made to pension plans	32.8
Expected additional contributions made to pension plans	$ 0.5