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Outsourcing Services Agreement (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Outsourcing Services Agreement [Abstract]        
Outsourced corporate staff costs $ 3.4 $ 3.9 $ 7.0 $ 7.8