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Accounting for Derivatives (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Country
Dec. 31, 2010
Derivative [Line Items]    
Notional amount of interest rate swaps   $ 585.0
Accounting For Derivatives (Textual) [Abstract]    
Notional value of floating payments 715.0  
Notional amount of interest rate swaps   585.0
Weighted average effective fixed interest rate payable on interest rate swaps 3.60% 4.60%
Interest expense on the ineffectiveness of interest rate swaps 0 0.2
Interest Rate swap gain loss to be reclassified during next 12 months 14.3  
Number of countries company operates 30  
Amount of interest rate swap termination payments   43.0
Deferred pre-tax losses amortized into interest expense during next 12 months 10.7  
Interest rate swaps expiring on or before August 2012 [Member]
    
Derivative [Line Items]    
Notional amount of interest rate swaps 465.0  
Accounting For Derivatives (Textual) [Abstract]    
Notional amount of interest rate swaps $ 465.0