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Real estate (Details 7) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Real Estate [Abstract]        
Customer reimbursements $ 7.9 $ 7.2 $ 15.7 $ 15.0