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Debt facility (Details) (USD $)
1 Months Ended
Dec. 31, 2012
Dec. 04, 2012
Debt facility [Abstract]    
Issuance Date Dec. 04, 2012  
Current borrowing capacity   $ 750,000,000
Expiration Date Dec. 04, 2017  
Line of credit facility expired   500,000,000
Maximum borrowing capacity   $ 1,000,000,000