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Level 4 Outsourcing Services Agreement (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Outsourcing Services Agreement [Line Items]        
Outsourced corporate staff costs $ 4.0 $ 3.6 $ 7.9 $ 7.3