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Pension Benefits (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Benefit (Textual) [Abstract]      
Cost recognized for defined contribution pension plans $ 18.3 $ 17.1 $ 15.0
Income from change in retirement plan obligation 3.7    
Amortized from accumulated other comprehensive (loss) income into net periodic benefit cost (0.2)    
Accumulated benefit obligation 100.4 114.3  
Estimations of contributions into benefit plan during 2012 $ 10.7    
Growth oriented assets 70.00%    
Defensive assets 30.00%    
Norwegian Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of Ownership of Defined Benefit Pension Assets 75.00%    
Australia Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of Ownership of Defined Benefit Pension Assets 25.00%