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Outsourcing Services Agreement (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Outsourcing Services Agreement [Abstract]        
Outsourced corporate staff costs $ 3.8 $ 4.0 $ 11.6 $ 11.9