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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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