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Level 4 Outsourcing Services Agreement (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Outsourcing Services Agreement [Abstract]        
Outsourced corporate staff costs $ 3.9 $ 4.0 $ 7.8 $ 7.9