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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 |

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