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Level 4 Outsourcing Services Agreement (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Outsourcing Services Agreement [Line Items]        
Outsourced corporate staff costs $ 4.0 $ 3.7 $ 11.9 $ 11.0