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Outsourcing Services Agreement Level 4 Outsourcing Services Agreement (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Outsourcing Services Agreement [Abstract]              
Outsourced corporate staff costs $ 4.0 $ 3.6 $ 7.9 $ 7.3 $ 15.0 $ 14.7 $ 14.4