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Employee Benefit Plans (Reconciliation of the Beginning and Ending Balances for Investments) (Details) (Level 3 [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Level 3 [Member]
   
Beginning balance $ 15.4 $ 14.2
Actual return on plan assets held 0.4 0.7
Foreign currency changes 0.1 0.5
Ending balance $ 15.9 $ 15.4