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Basis of Presentation (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Basis of Presentation |  |  |  |
Net loss | $ (2.0) | $ (28.8) | $ (1,200.0) | $ (491.1)
Cash and cash equivalents | $ 71.9 | $ 72.3 | $ 292.9 | $ 37.6

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