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Basis of Presentation (Narrative) (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
Organization, Consolidation and Presentation of Financial Statements [Abstract]            
Adjustments to Additional Paid in Capital, Stock Split     $ 12.5      
Net loss (40.9) (92.0) (42.9) (120.8) 1,200.0 491.1
Cash and cash equivalents 194.7 229.0 194.7 229.0 292.9 37.6
Long-Term Debt $ 530.0   $ 530.0   $ 530.0