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Debt and Credit Facilities (Details Textual)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended
Jun. 30, 2011
USD ($)
Dec. 31, 2010
USD ($)
Jun. 30, 2011
Global Credit facility [Member]
USD ($)
Dec. 31, 2010
Global Credit facility [Member]
USD ($)
Jun. 30, 2011
European Credit Facility [Member]
USD ($)
Jun. 30, 2011
European Credit Facility [Member]
EUR (€)
Dec. 31, 2010
European Credit Facility [Member]
USD ($)
Debt and Credit Facilities (Textuals) [Abstract]              
Amount available under credit facility $ 951.4 $ 926.3 $ 472.0   $ 214.0 € 150.0  
Facility fees as percentage of amount available under credit facility     0.20%        
Credit facility amount outstanding 9.8 23.5 0 0 0   0
Period of repayment of outstanding amount upon the occurrence of specified events     60 days   60 days 60 days  
Additional Debt and Credit Facilities (Textuals) [Abstract]              
Short-term borrowings $ 9.8 $ 23.5