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Basis of Presentation (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 | Dec. 31, 2013 Scenario, Forecast [Member]
Adjustments to Additional Paid in Capital, Stock Split |  |  | $ 12.5 |  |  |  |  |
Net loss | (44.3) | 4.5 | (87.2) | (116.3) | 1,200.0 | 491.1 |  |
Cash and cash equivalents | 128.4 | 303.3 | 128.4 | 303.3 | 292.9 | 37.6 |  | 250.0
Long-Term Debt | 530.0 |  | 530.0 |  | 530.0 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 110.0 |
NYSE Minimum 30 Day Average Closing Price | $ 1.00 |  | $ 1.00 |  |  |  |  |

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